Short Answer Question 7) Why do we use glass in constructing houses? Ans. G__l_a_s_s_m__a_k_e__s_t_h_e__h_o_u_s_e__lo__o_k__m_o__re__a__ir_y_a__n_d__s_p_a_c__io_u_s_._I_t_a_l_s_o_l_e_t_s_i_n_n__a_t_u_ra__l _li_g_h_t_._________ S_o__w__e__u_s_e__g_la__s_s _in__c_o__n_s_tr_u_c_t_i_n_g__h_o_u_s_e_s_._______________________________________________ ____________________________________________________________________________________ Understanding True or False 8) While preparing the clay for bricks, mixing is done to make the clayey soil smooth and uniform. [ True ] 9) Moulds are not used to shape the bricks; it is done with hands. [ False ] 10) Bricks are fired to make them soft. [ False ] 11) A kiln cools down immediately after firing. [ False ] Short Answer Questions 12) What are bricks mostly made of? Ans. B__ri_c_k_s_a__re__m__o_s_t_ly__m__a_d_e__o__f _c_l_a_y__o_r_c_o__n_c_r_e_t_e_.__________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 13) What is shown in the picture? What is it used for? Ans. $___N_LOQ__L_V_V_K_R_Z__Q__LQ__WK__H__S_LF__WX__UH___,W_L_V_X_V_H_G__I_R_U_À_U_LQ__J_E__UL_F_N_V__________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ WB: Building Materials 15
Long Answer Question 14) Write the steps involved in making bricks. Use the images as hints. Step 1: _W__a_t_e_r_i_s_a_d__d_e_d__a__n_d__m__ix_e_d__w__it_h__c_la__y_e_y__s_o_il_. ________________ __________________________________________________________ Step 2: _M__o_u_l_d_s_a__re__u_s_e_d__t_o__s_h_a_p__e_w__e_t__c_la__y_t_o__fo__rm___b_r_ic_k_s_.__________ __________________________________________________________ Step 3: _B_ri_c_k_s_a__re__a_i_r-_d__ri_e_d__in__t_h_e__o_p_e__n_.____________________________ __________________________________________________________ Step 4: _Th__e_d__ri_e_d__b_r_ic__k_s_a_r_e__h_a_r_d_e__n_e_d__u_s_i_n_g__fi_re__i_n_k_i_ln_s_._____________ __________________________________________________________ Application Multiple Choice Questions 15) What are the large buildings built by Maharajas that provided housing to several people called? [C] (A) verandas (B) bungalows (C) forts (D) terraces 16) Why did forts not get hot inside? [C] (A) because their doors were kept closed all the time (B) because they had electric fans (C) because they had high ceilings and small windows near the roof (D) because water was sprayed on them all the time 16
Short Answer Questions 17) What ensured hygienic conditions inside the forts? Ans. T_h__e_p__re__se__n_c_e__o_f__su__n_li_g_h_t_a__n_d__f_lo_w__o__f_f_re_s_h__a_i_r_e_n_s_u_r_e_d__h__y_g_ie__n_ic__c_o__n_d_i_ti_o_n_s__in_s_id__e__th__e____ f_o_r_t_s.________________________________________________________________________________ ____________________________________________________________________________________ 18) Name any two things in your house that keep it cool and airy. Ans. L_e__a_r_n_e_r_’s__re__sp__o_n_s_e__(_H_i_n_t:_a__rr_a_n__g_e_m__e_n__t_o_f_w__in__d_o_w__s_,_c_u_r_t_a_in__s,__p_la__n_t_s_a_r_o_u_n__d__th_e__h__o_u_s_e___ a__n_d__s_o__o_n_)__________________________________________________________________________ ____________________________________________________________________________________ Long Answer Question 19) Identify the fort in the given picture. Describe its interior in a few lines. Ans. I_t_is__th__e__M_e__h_ra__n_g_a__rh__f_o_r_t_in__J_o_d__h_p_u__r,_R_a__ja__st_h_a__n_._It__is_o__n_t_h_e__t_o_p__o_f__a__h_il_l._I_t _h_a_s__th__ic_k_,______ _st_r_o_n_g__w__a_l_ls_. _T_h_e_y__k_e_e_p__t_h_e__r_o_o_m__s__c_o_o_l_a__n_d__p_r_o_t_e_c_t__p_e_o__p_le__f_ro__m__t_h_e__h_o__t _d_e_s_e_r_t_S_u__n_.___ _H_ig__h_c__e_il_in__g_s_h_a__v_e__w_i_n_d_o__w_s__n_e_a__r _th__e_r_o_o__fs__w_h__ic_h__a_l_lo_w___fr_e_s_h__a_i_r _to__c__o_m__e__in_.____________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ WB: Building Materials 17
Higher Order Thinking Skills (H.O.T.S.) Long Answer Question 20) Tick the house that may survive a ground shake. Why? a) b) 9 Ans. _A__b_h_u_n__g_a__h_o_u__se__s_u_r_v_iv__e_s_g_r_o_u__n_d__s_h_a_k_e_s_._____________________________________________ _It_s_h_e__ig_h__t,_c__y_li_n_d_r_ic_a__l _sh__a_p_e__a__n_d__c_o_n__ic_a__l _ro__o_f_g_i_v_e__it_t_h_e__s_t_re_n__g_t_h__to__s_u_r_v_iv_e__g_r_o_u__n_d______ _sh__a_k_e_s_._____________________________________________________________________________ 18
Lesson 13 Types of Cloth Remembering Multiple Choice Questions 1) Identify the plant fibre from the following. [C] (A) silk (B) wool (C) cotton (D) leather 2) Which of the following is an artificial (synthetic) fibre? [A] (A) nylon (B) jute (C) cotton (D) leather Fill in the Blanks 3) ___________W__o_o__l __________ is mostly obtained from the fleece of sheep or goat. 4) __________N__a_tu__ra__l __________ fibres are obtained from natural resources like plants or animals. Very Short Answer Questions 5) What are clothes made of? Ans. _fi_b_r_e_s_______________________________________________________________________________ 6) How is silk fibre drawn? Ans. _S_ilk__f_ib_r_e__is__d_r_a_w__n_f_r_o_m__t_h_e__c__o_c_o_o__n__o_f_a__s_il_k_w_o__rm__._____________________________________ Short Answer Question 7) Name the fibres in the given pictures. a) b) Ans. _a_)_j_u_t_e__fi_b_r_e_______b_)__w_o__o_l _fi_b_r_e_______________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 19
Understanding Match the Following 8) a) weaving 9) b) spinning machine 10) c) machine separating seeds from cotton bolls 11) d) hand spinning Short Answer Questions 12) What are cotton bolls? Ans. _Th__e__fl_o_w__e_rs__o_f_c__o_t_to__n_p__la_n__ts__d_e_v_e__lo_p__i_n_t_o__g_re__e_n__fr_u_i_ts__w_i_th__s_e_e__d_s_i_n_t_h_e__m__. ______________ _W__h_it_e_,_s_o_f_t_, _fl_u_f_fy__fi_b_r_e_s_o__f_d_i_ff_e_r_e_n_t__le_n__g_t_h_s_g_r_o_w___a_r_o_u_n_d__t_h_e__s_e_e_d__s_t_o__fo__rm___b_o_l_ls_.________ ____________________________________________________________________________________ 13) What is yarn? Ans. <__D_U_Q_L_V_D__F_R__Q_WL_Q_X_R__X_V_W_K_U_H_D_G__I_R_U_P__H_G__E_\\__J_U_R_X_S__LQ_J__D__Q_G__WZ__L_VW_LQ__J_W_K_H__À_E__UH_V_________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 20
Long Answer Question 14) Answer the following questions based on the jute plant. a) In which season and _ra__in_y__s_e_a_s_o_n______________________________________________ area does it grow? _W__e_s_t_B_e_n__g_a_l_, _A_s_s_a_m__,_B_i_h_a_r_(_a__n_y_o__n_e_)______________________ b) How do we make jute _7_K_H__MX_W_H__À_E_U_H_V_D__UH__U_H_P__R_Y_H__G__IU_R_P___WK__H_V_W_H_P___D_Q_G__G_U_LH__G_______ cloth? _7_K_H_Q__W_K_H__À_E_U_H_V_D__UH__Z__R_Y_H_Q__L_Q_W_R_W_K_U_H_D__G_V_ ___________________ c) What do we make _J_u_t_e__c_lo__th_e__s,__g_u_n_n__y_b__a_g_s_________________________________ from jute threads? _________________________________________________________ Application Multiple Choice Questions [A] 15) Name the process shown in the picture. (A) dyeing (B) printing (C) mixing (D) weaving 16) What is done in block printing? [B] (A) Mixing of different colours is done to print on cloth. (B) A block of design is used to make prints on cloth. (C) Cloth is whitened. (D) Two sets of yarns are arranged together. Short Answer Questions 17) Why do clothes look beautiful? Ans. _C_l_o_t_h_e_s_l_o_o_k__b_e__a_u_t_if_u_l_d__u_e__to__d__if_fe_r_e_n__t _c_o_l_o_u_r_s_a__n_d__p_a__tt_e_r_n_s_o__n_t_h_e__m_.__________________ ____________________________________________________________________________________ ____________________________________________________________________________________ WB: Types of Cloth 21
18) State a difference between natural and synthetic dyes. Ans. _N_a_t_u_r_a_l_d__y_e_s_a__re__o_b__ta__in_e__d__fr_o_m___n_a_t_u_r_a_l_r_e_s_o_u_r_c_e_s__s_u_c_h__a_s__p_la__n_t_s_a_n_d__a__n_im__a__ls_._________ _S_y_n_th__e_t_ic__d_y_e__s_a_r_e__o_b__ta__in_e_d__f_r_o_m__c__h_e_m__ic__a_l_s._________________________________________ ____________________________________________________________________________________ Long Answer Question 19) Draw a design for making a printing block of your choice. Ans. Learner’s response (Hint: ) Higher Order Thinking Skills (H.O.T.S.) Long Answer Question 20) How should we take care of woollen and silk clothes? Write on the following points. a) Cleaning _W__a_s_h__in__c_o_l_d__w_a__te__r_o_r_d__ry_-_c_l_e_a_n__. ______________________________ ______________________________________________________________ b) Drying _D_r_y_l_ig__h_t_c_o__lo_u__re__d_c__lo_t_h_e__s_in__d__ir_e_c_t_s_u_n__lig__h_t_, _a_n_d__d__a_r_k___________ _c_o_l_o_u_r_e_d__o_n__e_s_i_n_t_h_e__s_h_a__d_e_.___________________________________ _S_il_k_c_l_o_t_h_e_s__n_e_e_d__t_o__b_e__i_ro_n__e_d__a_t__lo_w__h__e_a_t__a_n_d__w__o_o_l_le_n__________ c) Free from wrinkles _c_lo__th__e_s_n__e_e_d__t_o__b_e__ir_o_n_e__d__in_s_id__e__o_u_t_.__________________________ d) Storing _S_to__re__t_h_e_m___w_i_t_h_m__o__th_b__a_l_ls_o__r _d_r_ie_d__n__e_e_m___le_a__v_e_s_._______________ ______________________________________________________________ 22
Lesson 14 Fuels Remembering Multiple Choice Questions 1) From the following, identify the fuel in solid form. [B] (A) petrol (B) firewood (C) LPG (D) diesel 2) How are fossil fuels dug out? [B] (A) through crushing (B) through mining (C) through grinding (D) through mixing Fill in the Blanks 3) Vehicles get energy to run from _________fu__e_ls_________. 4) Natural gas is a fuel in _____________g_a__se__o_u_s_____________ form. Very Short Answer Questions 5) Give an example of domestic fuel in liquid form. Ans. k_e__ro__se__n_e_,_L_P_G___(a__n_y__o_n_e__) ____________________________________________________________ 6) What do we call a hole dug into the ground to take out fuels? Ans. _m_i_n_e________________________________________________________________________________ Short Answer Question 7) What are fossil fuels? Give an example. Ans. W__h__e_n__d_e_a__d__p_la__n_t_s_a_n__d_a__n_im__a__ls_g__e_t_c__o_v_e_r_e_d__b_y__h_e__a_v_y__la_y__e_rs__o_f_s_o_i_l,_t_h_e_y__c_h__a_n_g__e_i_n_t_o__ f_u_e__ls_, _w_h__ic_h__a__re__c_a__lle__d__fo__ss_i_l _fu_e__ls_._F_o_r_e__x_a_m__p_l_e_,_p_e__tr_o_l_e_u_m__,_c__o_a_l_a_n__d__n_a_t_u_r_a_l_g_a__s_. ______ ____________________________________________________________________________________ 1
Understanding True or False 8) Motor fuels are generally used to run vehicles. [ True ] 9) Aeroplanes run on electricity. [ False ] 10) Petrol is the most common fuel used in two-wheelers today. [ True ] 11) Boats and ships with power engines mostly use water as a fuel. [ False ] Short Answer Questions 12) What are motor fuels? Where do we get them from? Ans. _Th__e__fu_e__ls_u__se__d__to__r_u_n__v_e_h_i_c_le__s_a_r_e__c_a__lle__d__m_o__to__r_f_u_e_ls_._W__e__g_e__t_t_h_e__fu__e_ls__fr_o_m___p_e_t_r_o_le__u_m___ _w_h_i_c_h__is__d_u_g__o_u__t_f_ro_m___m__in_e__s._________________________________________________________ ____________________________________________________________________________________ 13) Name any two road vehicles that run on diesel. Ans. L_e__a_r_n_e_r_’s__re__sp__o_n_s_e__(_H_i_n_t:_b__u_s_e_s_,_t_ru_c__k_s_)_______________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Long Answer Question 14) State the uses of the following: a) CNG b) LPG Ans. a__)_C__N_G__:_I_t _is__u_s_e_d__a_s_a__f_u_e_l_t_o__r_u_n__c_a_r_s_, _a_u_t_o__ri_c_k_s_h_a__w_s__o_r_b_u__se__s.________________________ b__)_L_P_G__:_I_t _is__m_o__st_l_y_u_s_e_d__i_n__o_u_r_h_o__m__e_s_f_o_r_c__o_o_k_i_n_g_._I_t_c_a__n__b_e__u_s_e_d__a_s__a__fu_e__l _to__r_u_n________ c__e_r_ta__in__v_e_h__ic_l_e_s_. ____________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 2
Application Multiple Choice Questions 15) Which of the following can be done to save fuels? [C] (A) using vehicles for walkable distances (B) not using public transport (C) switching off vehicles at signals (D) not taking care of our vehicles 16) Which of the following is not obtained from fossil fuels? [B] (A) plastic (B) glass (C) medicines (D) cosmetics Short Answer Questions 17) Do you have a vehicle at home? What do your parents and you do to take care of it so that it consumes less fuel? Ans. L_e__a_r_n_e_r_’s__re__sp__o_n_s_e__(_H_i_n_t:_T_a__k_e__it_t_o__th__e_m__e__c_h_a_n__ic__r_e_g_u_l_a_r_ly__fo__r_m__a_i_n_te__n_a_n__c_e__a_n_d__s_o__o_n_._) ____________________________________________________________________________________ ____________________________________________________________________________________ 18) Write whether Right or Wrong: a) Some people use bicycles in place of motor vehicles to save fuel. [ Right ] b) People should never use carpooling (sharing car) though it saves fuel. [ Wrong ] Long Answer Question 19) Ashraf has seen many petrol pumps and shops for LPG everywhere. He wonders why we should use fuel carefully if so much fuel is available anyway. Explain to him the reasons for using fuels carefully. Ans. T_h_o__u_g_h__t_h_e_s_e__f_u_e_ls__a_r_e__a_v_a_i_la__b_le__t_o_d__a_y_,_d_u__e__to__e_x_c__e_s_s_iv_e__u_s_e_,_t_h_e_y__m__a_y__g_e__t _o_v_e__r.______ M__o_r_e_o__v_e_r_, _t_h_e_y__ta__k_e__th_o__u_s_a_n_d__s_o_f__y_e_a_r_s_t_o__fo__rm__._T_h_e__re__fo_r_e_,_w__e__n_e__e_d__to__p__re__se__rv_e__f_u_e_l_s__ f_o_r_o__u_r_f_u_t_u_re__. _S_o__w_e__s_h_o__u_ld__u_s_e__t_h_e_m___c_a_r_e_f_u_ll_y_. _______________________________________ ____________________________________________________________________________________ WB: Fuels 3
____________________________________________________________________________________ ____________________________________________________________________________________ Higher Order Thinking Skills (H.O.T.S.) Long Answer Question 20) Distinguish between renewable and non-renewable fuels. Ans. Renewable fuels Non-renewable fuels _Th__e_s_e__fu_e__ls_c__a_n__b_e__p_r_o_d__u_c_e__d_i_n__a__sh__o_rt____ _T_h_e_y__c_a__n_n_o_t__b_e__p_r_o_d__u_c_e_d__e__a_s_il_y_. ________ _sp__a_n__o_f_t_im__e__. ____________________________ _T_h_e_i_r_f_o_r_m_a__ti_o_n__t_a_k_e_s__a__lo_n_g__t_im__e__. ________ _F_o_r_e_x_a__m_p__le__, _b_io__g_a_s__a_n_d__b__io_d__ie_s_e__l._______ _F_o_r_e__x_a_m__p_l_e_,_p__e_t_ro_l_._____________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ _________________________________________ 4
Lesson 15 Ways of Communication Remembering Multiple Choice Questions 1) What means of communication should we use to communicate with less number of people? [D] (A) television (B) radio (C) newspaper (D) telephone 2) Which of the following is a written form of communication? [A] (A) letter (B) television (C) telephone (D) radio Fill in the Blanks 3) ___________C__o_m__m__u_n_i_c_a_t_io__n___________ can be between a few people or many people. 4) Radio, internet and newspaper are the ways to share ___________in_f_o_r_m__a_ti_o_n___________. Very Short Answer Questions 5) Give an example of communication in audio form. Ans. _ra__d_io________________________________________________________________________________ 6) Give an example of communication with many people. Ans. _L_e_a_r_n_e_r_’_s_r_e_s_p_o_n__se__(_H_i_n_t_: _te__le_v_i_s_io_n__, _n_e_w__s_p_a_p__e_r_, _in_t_e_r_n_e_t__(a__n_y__o_n_e_)_)____________________ Short Answer Question 7) When does communication occur? Ans. _C_o__m_m__u__n_ic_a__ti_o_n__o_c__c_u_r_s_w__h_e_n__w__e_p__a_s_s_i_n_f_o_rm__a__ti_o_n__fr_o_m___o_n_e__p__la_c__e_t_o__a_n__o_t_h_e_r_. ________ ____________________________________________________________________________________ ____________________________________________________________________________________ 5
Understanding a) envelope with letter b) postbox Match the Following c) postcard d) inland letter 8) 9) 10) 11) Short Answer Questions 12) How do we mostly send letters these days? How is it better than using a postcard? Ans. T_h_e__s_e_d__a_y_s_,_w__e__m__o_s_tl_y_s_e_n__d__le_t_t_e_rs__th__ro__u_g_h__t_h_e__in_t_e_r_n_e_t__a_s_e__-m__a__ils_._T_h_e__y_r_e_a__c_h__w_i_th__in____ s_e_c__o_n_d__s.____________________________________________________________________________ ____________________________________________________________________________________ 13) What happens to the letters that we put in a postbox? Ans. F_r_o_m___th__e_p__o_s_t_b_o_x_,_l_e_t_te__rs__g_o__t_o_t_h_e__p__o_s_t _o_f_fi_c_e_.__Th__e_re__,_t_h_e__le_t_t_e_r_s_a_r_e__s_o_rt_e_d__a__s_p_e__r_t_h_e___ a__d_d__re_s_s_e_s_._P_o__st_m__e_n__t_h_e_n__d_e__li_v_e_r_t_h_e__le__tt_e_r_s_t_o__th__e_g__iv_e__n_a__d_d_r_e_s_s_e_s_.____________________ ____________________________________________________________________________________ 6
Long Answer Question 14) How do mobile phones use radio waves to send and receive information? Use the images as hints and write in the space provided. _A__m_o__b_i_le__p_h_o__n_e__s_e_n_d_s__o_u_t__in_f_o_r_m__a_t_io_n__i_n_t_h_e__f_o_r_m__o_f____ _ra__d_io__w__a_v_e__s.__________________________________________ _Th__e_s_e__w_a__v_e_s_h__it_a__m__o_b__ile__t_o_w__e_r_._______________________ ______________________________________________________ _Th__e__to_w__e_r__th__e_n__se__n_d_s__ra__d_io__w__a_v_e__s_t_o_a__n_o_t_h_e__r _p_h_o__n_e_.___ _Th__e__o_th__e_r_m__o_b__il_e_p__h_o_n_e__r_e_c__e_iv_e__s_t_h_e__in_f_o_r_m__a_t_io__n_. ______ ______________________________________________________ ______________________________________________________ Application Multiple Choice Questions 15) Which of the following is a benefit of using computers and mobile phones? [C] (A) Bright screens of computers may harm our eyes. (B) We can spend a lot of time playing video games on mobiles which may affect our health. (C) We can stay in touch with our family and friends. (D) Earphones that we use may be harmful to our ears. WB: Ways of Communication 7
16) Which of the following health problems is caused mostly due to the overuse of mobile phones? [D] (A) fever (B) pain in legs (C) stomach problems (D) eye problems Short Answer Questions 17) How can we learn new things from the internet? Ans. _W__e_c__a_n__le__a_rn__n_e__w__t_h_in__g_s_f_ro__m__t_h_e__in__te__rn_e__t_u_s_in_g__G__o_o__g_le__,_Y_a_h__o_o_!_,_W__ik_i_p_e_d__ia__a_n__d__so__o__n_. _Th__is_i_n_f_o_r_m_a__ti_o_n__w__e_c__a_n__u_s_e__in__o_u_r__st_u_d__ie_s_.____________________________________________ ____________________________________________________________________________________ 18) Give examples of social networking media of communication. Ans. _F_a_c_e__b_o_o__k_, _W__h_a_t_s_A_p__p_______________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Long Answer Question 19) What are the benefits and problems of communication media? Benefits Problems _W__e__c_a_n__le__a_r_n_n__e_w__t_h_in__g_s_u__si_n_g__t_h_e________ _T_h_e_y__m__a_y__c_a__u_s_e_h__e_a_l_th__p__ro_b__le__m_s_.________ _in_t_e_r_n_e_t_._________________________________ _________________________________________ _W__e__c_a_n__s_ta__y_i_n__to__u_c_h__w__it_h_o__u_r_f_ri_e_n_d__s_____ _W__e__d_o__n_o__t _g_e_t__e_n_o__u_g_h__e_x_e_r_c_i_s_e_._________ _a_n_d__f_a_m__i_ly_.______________________________ _________________________________________ 8
Higher Order Thinking Skills (H.O.T.S.) Long Answer Question 20) Prepare a birthday message for your friend using pictographs. Ans. Learner’s response (Hint: Happy birthday) WB: Ways of Communication 9
Lesson 16 Force and Work Remembering Multiple Choice Questions 1) Why is force applied in the given picture? [B] (A) for pushing (B) for pulling (C) for both pushing and pulling (D) for changing shape 2) What is the child in the given picture doing? [C] (A) applying force to stop the ball (B) applying force to change the shape of the ball (C) applying force to change the direction of the ball (D) breaking the ball into two pieces Fill in the Blanks 3) Depending on the applied ____________f_o_rc__e____________, objects move faster or slower. 4) If we press against a plastic bottle, its ___________s_h_a_p__e___________ will change. Very Short Answer Questions 5) What type of force is shown in the given picture? (Push/Pull) Ans. _p_u_s_h________________________________________________________________________________ 6) How can we burst a fully blown balloon using force? Ans. _b_y__p_r_e_s_s_in_g__it________________________________________________________________________ 10
Short Answer Question 7) When do we need to apply force? Ans. W__e__n_e__e_d__t_o_a__p_p__ly__fo__rc_e__t_o__m__o_v_e__a_n__o_b__je__c_t,__to__s_t_o_p__a__m__o_v_in__g__o_b_j_e_c_t_o__r_t_o_c__h_a_n__g_e__th__e_ d__ir_e_c_t_io__n__o_f_a_n__o_b__je__c_t_. _W__e_a__ls_o__n_e_e__d__fo__rc_e__t_o__c_h_a__n_g_e__t_h_e__s_h_a_p__e_o__f_a_n__o_b__je_c__t._________ ____________________________________________________________________________________ Understanding True or False 8) A smooth surface causes more friction. [ False ] 9) The raindrops are pulled towards the ground by the force of friction. [ False ] 10) Friction helps us to hold things tight. [ True ] 11) Without friction, moving things will not stop. [ True ] Short Answer Questions 12) Give two examples of the force of gravity. Ans. T_h_e__b__a_ll_t_h_a__t_w__e_t_h_r_o_w__u__p__c_o_m__e_s__b_a_c__k_t_o_w__a_r_d_s__th__e_g__ro__u_n_d_.__Th__e_r_a_i_n_d_r_o_p__s_a_r_e__p_u_l_le__d___ t_o_w__a_r_d_s__th__e_g__ro__u_n_d__. ________________________________________________________________ ____________________________________________________________________________________ 13) How does oil help to reduce friction? Ans. _O_i_l _fo__rm__s_a__l_a_y_e_r__o_v_e_r__a_s_u_r_f_a_c_e__a__n_d__re__d_u_c_e__s_i_ts__ro_u__g_h_n_e__s_s._S_o__, _fr_ic__ti_o_n__is__re__d_u_c_e__d_.______ ____________________________________________________________________________________ ____________________________________________________________________________________ Long Answer Question 14) Write a note on friction. Ans. F_r_ic__ti_o_n__is__a__fo__rc_e__t_h_a__t _s_to__p_s_t_h_e__m__o_v_e__m_e__n_t_o_f__tw__o__t_h_in_g__s_t_o_u_c__h_in_g__e__a_c_h__o_t_h_e__r._F_r_ic__ti_o_n__ c__a_n__b_e__t_h_o_u__g_h_t_t_o__b_e__c_a__u_s_e_d__b_y__b_u__m_p__s_o_n__t_w__o_t_h_i_n_g_s_._T_h_i_n_g_s__w_i_th__a__r_o_u_g_h__s_u_r_fa__c_e_____ c__a_u_s_e__m__o_r_e__fr_ic__ti_o_n__th__a_n__th__in_g__s_w__it_h_s_m__o_o__th__s_u_r_fa__c_e_s_._________________________________ ____________________________________________________________________________________ WB: Force and Work 11
____________________________________________________________________________________ ____________________________________________________________________________________ Application Multiple Choice Questions 15) Choose the incorrect statement from the given statements. [B] (A) When we put force on an object and move it, we do work. (B) When we hit a ball using a bat, there is no work done. (C) We do work when we pick up a box from the ground. (D) If we make a pot from clay, there is work done. 16) In which of the following situations is work done? [C] (A) Munaf is sitting on a chair. (B) A car is parked in a garage. (C) Ana lifted a heavy box from the ground. (D) Tanya is watching a movie. Short Answer Questions 17) When is work said to be done? Ans. W__o_r_k__is_s_a__id__t_o_b__e__d_o_n__e_i_f_t_h_e__fo__rc__e_a__p_p_l_ie__d_t_o__a_n__o_b__je__c_t_e_i_th__e_r_m__o_v_e__s_t_h_e__o_b_j_e_c_t_,_s_t_o_p_s_ a__m__o_v_i_n_g__o_b__je_c__t _o_r_c__h_a_n_g__e_s_t_h_e__s_h_a__p_e__o_f_t_h_e__o_b__je_c__t._________________________________ ____________________________________________________________________________________ 18) Look at the given picture. Can we say that work is done? Give a reason. 12
Ans. Y__e_s_, _w_o__rk__is__d_o_n__e_h__e_r_e_._T_h_e_r_e__is_d__is_p_l_a_c_e__m__e_n_t_o__f_a__fr_u_i_t_f_ro_m___t_h_e__tr_e_e_.__Th__is_i_s_d_u__e__to__t_h_e___ f_o_r_c_e__o_f__g_r_a_v_it_y_._____________________________________________________________________ ____________________________________________________________________________________ Long Answer Question 19) How can we say that work is done in the following situation? Lifting a bottle kept on the table. Ans. W__h__e_n__w_e__l_if_t _a__b_o_t_t_le__k_e_p__t_o_n__t_h_e__ta__b_l_e_,_t_h_e__b_o_t_t_le__h_a__s_m__o_v_e__d_f_r_o_m__i_t_s _o_r_ig__in_a_l_p__o_s_it_io__n_._ T_h__e_f_o_r_c_e__w__e__a_p_p__lie__d__h_a_s__m_o__v_e_d__t_h_e__o_b__je_c__t,_s_o__w__o_r_k_i_s _d_o__n_e_._________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Higher Order Thinking Skills (H.O.T.S.) Long Answer Question 20) Read the statements given below. Tick (9) where work is done and cross (8) where work is not done. a) Ravi is carrying a heavy bag in his hand and sitting in one place. 8 b) Raju is reading a book sitting at a table. 8 c) Rashi is watching TV sitting on a chair. 8 d) Rina is walking up the stairs with a small bag on her shoulder. 9 WB: Force and Work 13
Lesson 17 Forms of Energy Remembering Multiple Choice Questions 1) Which of the following is the basic source of energy on the Earth? [D] (A) fuel (B) wind (C) water (D) Sun 2) Which of the following provides heat and light naturally? [C] (A) wind energy (B) water (C) solar energy (D) food Fill in the Blanks 3) The energy we get from the Sun is called _____________s_o_l_a_r_e__n_e_r_g_y_____________. 4) Vehicles get energy from ________________fu_e__ls________________. Very Short Answer Questions 5) State any one natural source of energy. Ans. L_e__a_r_n_e_r_’s__re__sp__o_n_s_e__(_H_i_n_t:_w__in__d_,_w__a_t_e_r_,_t_h_e__S_u_n__(a__n_y__o_n_e_)_)______________________________ 6) Name a source of energy which is limited. Ans. f_u_e__ls________________________________________________________________________________ 14
Short Answer Question 7) What is the use of solar energy for plants? Ans. P__la_n__ts__u_s_e_s_o__la_r_e__n_e_r_g_y__t_o_m__a__k_e_t_h_e__ir_f_o_o_d__a__n_d__s_to__re__i_t _in__d_i_ff_e_r_e_n_t__p_la__n_t_p__a_r_ts_.__________ ____________________________________________________________________________________ ____________________________________________________________________________________ Understanding Match the Following 8) fans and bulbs get energy from a) light energy 9) objects thrown upwards come down due to b) heat energy 10) the form of energy we can see is c) electricity 11) we feel warmth because of d) gravity Short Answer Questions 12) Identify the sources of energy being used in the following pictures. a) b) ________w__in__d_e__n_e_r_g_y______________ _______________e_le__c_t_ri_c_it_y___________ 13) What will happen if you throw an eraser in the upward direction? Which energy is used in this case? Ans. T_h_e__e__ra__se__r _w__ill_c__o_m__e__d_o_w__n_._T_h_i_s_is__b_e_c__a_u_s_e__g_r_a_v_i_ty__p_u__lls__e_v_e__ry_t_h_in__g__d_o_w__n_.______________ ____________________________________________________________________________________ ____________________________________________________________________________________ WB: Forms of Energy 15
Long Answer Question _t_o__w_a__sh__c_l_o_t_h_e_s_________ ________________________ 14) What are the uses of electricity? Use the images as hints. ________________________ ________________________ a) _to__li_g_h_t__u_p__o_u_r_h__o_m__e_s____ b) ________________________ ________________________ ________________________ c) _to__r_u_n__te__le_v__is_io_n__s_a_n__d____ d) _t_o_c__o_o_k__f_o_o_d____________ _c_o_m__p__u_te__rs______________ ________________________ ________________________ ________________________ ________________________ ________________________ e) _to__c__o_o_l_o_u__r _h_o_m__e_s__a_n_d___ f) _t_o_g__ri_n_d__f_o_o_d____________ _o_f_fi_c_e_s__________________ ________________________ ________________________ ________________________ ________________________ ________________________ g) _to__p__re_s_e__rv_e__f_o_o_d_________ h) _t_o_b__ri_n_g__w__a_t_e_r_t_o__o_u_r____ ________________________ _h_o_m__e__s _________________ ________________________ ________________________ ________________________ ________________________ Application Multiple Choice Questions 15) Which of the following forms of energy lights up tube lights? [A] (D) sound (A) electricity (B) gravity (C) elastic 16
16) Which of the following forms of energy will we use to cook our food? [C] (A) water (B) wind (C) heat (D) sound Short Answer Questions 17) Which use of electrical energy is shown in the picture? Give another use of electrical energy. Ans. T_o__r_u_n__a__v_e_h_i_c_le__. _V_e_h__ic_l_e_s_h__e_lp__u_s__m__o_v_e__q_u_i_c_k_l_y_f_ro__m__p__la_c__e_t_o__p_l_a_c_e__. __________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 18) Which use of energy is shown in the picture? State how it is helpful in our daily life. Ans. T_o__r_u_n__a__v_e_h_i_c_le__. _V_e_h__ic_l_e_s_h__e_lp__u_s__m__o_v_e__q_u_i_c_k_l_y_f_ro__m__p__la_c__e_t_o__p_l_a_c_e__. __________________ ____________________________________________________________________________________ ____________________________________________________________________________________ Long Answer Question 19) Write the uses of energy based on the following images. a) b) c) d) _______t_o__p_la__y________ ___t_o__c_o__o_k_f_o_o__d______ ____t_o__ru_n__v_e__h_ic__le_s____ _____to__h__e_a_t_w__a__te_r____ _____________________ _____________________ _____________________ _____________________ WB: Forms of Energy 17
Higher Order Thinking Skills (H.O.T.S.) Long Answer Question 20) Make a poster using a chart paper on ‘how to conserve energy’. You may use the following points: turning off electrical devices when not in use UHF\\FOLQJRISDSHU XVLQJUHQHZDEOHVRXUFHVRIHQHUJ\\ PLQLPLVLQJWKHXVHRISODVWLF Ans. Learner’s response 18
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