AL PhysicsQuestionBank_8thPass(Final)

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 Contents 1 13 1. Measurement 29 2. Kinematics 59 3. Forces & Dynamics 68 4. Work, Energy and Power 77 5. Circular Motion 94 6. Gravitation 116 7. Thermal Physics 136 8. Oscillations 145 9. Waves 168 10. Superposition 181 11. Electric Fields 195 12. Current of Electricity 209 13. DC Circuits 220 14. Electromagnetism 235 15. Electromagnetic Induction (EMI) 243 16. Alternating Currents 261 1 7. Quantum Physics 279 1 8. Nuclear Physics Answers

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 Chapter 1 Measurement QA Beginner 1. This question is about uncertainty 4. This question is about percentage uncertainty While measuring the diameter of a wire, The drag force acting on a sphere travelling John made the following readings, through a fluid is directly proportional to the square of its speed. If the speed 2.38 mm, 2.41 mm, 2.39 mm, 2.40 mm, has a maximum error of 2%, what is the 2.42 mm maximum error allowed in measuring the drag force? How should he express the diameter measurement? (A) 2% [  ] (B) 6% (A) 2.400 mm (C) 4% (B) (2.40 ± 0.02) mm (D) 8% (C) (2.40 ± 0.01) mm (D) between 2.38 mm and 2.42 mm 5. This question is about precision  [  ] Audrey measures the diameter of a cylindrical rod using a vernier calipers. 2. This question is about uncertainty Which of the following techniques would increase the precision of the measurement? The calculated value of the speed of sound is 338.45 ms−1. If this result was accurate (A) Measure the diameter along different only to ±4%, how should this value be parts of the cylinder using vernier accurately recorded? calipers and then take the average value of the readings. (A) 338.45 ms−1 [  ] (B) 300 ms−1 (B) Measure the diameter along different (C) 340 ms−1 parts of the cylinder using a ruler (D) 338 ms−1 and then take the average value of the readings. 3. This question is about percentage uncertainty (C) Measure the diameter using a The density of a rod can be found by micrometer. measuring its diameter, length, and mass. If the percentage error in the (D) Measure the diameter using a measurement of its diameter, length, and vernier calipers without zero error. mass are 1%, 2%, and 3% respectively,  [  ] what are the percentage error in the calculated value of its density? (A) 6% [  ] (B) 8% (C) 7% (D) 9% Chapter 1 | Measurement 1

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 4 1. This question is about vectors relative to each other Which of the following represents the velocity of X relative to Y? 2 objects, X and Y are moving away from point P as shown below. The arrows AB signify the vector velocities of both X and Y. Velocity vector for object Y CD P Velocity vector for object X Intermediate 1. This question is about uncertainties 3. This question is about uncertainties The dimensions of a rectangular block of In order to determine the power dissipated metal are (90.0 ± 0.5) mm by (200.0 ± 0.5) in a resistor, the following quantities were mm by (160.5 ± 0.5) mm. If the mass of the measured: block is (152 ± 1) g, what is the percentage error in the calculated value of density? I = (3.45 ± 0.05)mA (A) 3% R = 5.3Ω ± 3% (C) 6% (B) 1% What would be the percentage uncertainty (D) 2% in the power measurement? [  ] (A) 4% (C) 6% 2. This question is about uncertainties (B) 3% [  ] (D) 2% In order to determine the thickness of a metal cylinder, its external diameter d2 and internal diameter d1 were measured as follows: d1 = (58.5 ± 0.5)mm d2 = (67.5 ± 0.5)mm What is the percentage error of 1 (d2 − d1 )? 2 (A) 11% (C) 6% (B) 5.5% (D) 8% [  ] Chapter 1 | Measurement 5

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 2 5. This question is about scalars and vectors Find the relative velocities of the following. A car was moving North at 40 m/s. It then moved 30 m/s. due East. (a) Relative velocity of X as seen by Y. (a) Find the change in velocity (b) Relative velocity of Y as measured by X. (b) Find the change in speed. 2 6. This question is about relative velocities 2 Cars, X and Y are moving with velocities as shown. North 30 m/s 40 m/s East XY Advanced 1. This question is about uncertainties 3. This question is about errors and uncertainties A student set up the circuit shown below In an experiment to measure g, the to determine the resistance of a wire and acceleration due to gravity, a simple hence the resistivity of the metal of the pendulum was used. If the uncertainty wire. in the measurement of period, T is ±∆T and the uncertainty in the measurement AV of length l is ±∆l, find the fractional uncertainty in the calculated value of g. wire 2. This question is about uncertainties The ammeter and voltmeter are both digital In an experiment to determine the (a) State one possible random error electro-chemical equivalent, Z, of copper which could occur in the use of the by electrolysis, the following formula was digital meters. How could this error used: be kept to a minimum? (b) Explain why the voltmeter must Z = m1 − m2 have a resistance much greater than It that of the wire in order to avoid a systematic error in the use of the Where m1 = (57.54 ± 0.01) × 10−3 kg ammeter. m2 = (53.50 ± 0.01) × 10−3 kg I = (1.90 ± 0.05)A t = (5,980 ± 1)s Express Z in terms of its uncertainty to the correct significant figures. Chapter 1 | Measurement 9

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 Brutal 1. This question is about errors (a) When using a digital voltmeter and digital ammeter to determine the resistance of a wire, state one possible random error which could occur in the use of the digital meters. (b) How could this error be kept to a minimum? (c) Explain why the voltmeter must have a resistance much greater than that of the wire, whose resistance it is trying to measure, in order to avoid a systematic error in the use of the voltmeter. 2. This question is about vectors Since linear velocity is a vector, angular velocity must also be a vector. Comment 3. This question is about uncertainties 3 quantities, u, v and f are related by the equation 1 =1 + 1 . The uncertainties of u and f v u v are as follows: u = 50 mm ± 3 mm v = 200 mm ± 5 mm If f has a calculated value of 40 mm, find its uncertainty. 4. This question is about relative velocities in 3-D A man is running on a horizontal road towards North at 8 km h−1 in the rain. He sees the rain dropping vertically as he runs. He increases his speed to 16 km h−1 and finds that the rain drops now make an angle of 30° with the vertical. What is the velocity of the rain drop? (A) 16 km h−1, 30° with the vertical, downwards, northwards. [  ] (B) 16 km h−1, 30° with the vertical, downwards, northwards. (C) 32 km h−1, 30° with the vertical, downwards, northwards. (D) 32 km.h−1, 30° with the vertical, downwards, northwards.  12 © Fairfield Book Publishers A Level Physics Question Bank

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 Chapter 2 Kinematics QA Beginner 1. This question is about distance 3. This question is about displacement-time graphs The graph shows the displacement-time Albert wants to find the depth of a well. graph of a journey of a car. He drops a stone and hears the splash 5s later. If the speed of sound is 340 ms−1, Displacement what is the depth of the well? (A) 60 m [  ] (B) 107 m (C) 140 m (D) 80 m 2. This question is about acceleration & speed 0 12 3 4 5 Time A block is released from a frictionless slide as shown. Which of the following is true? Which of the following shows the velocity time graph for the journey of the car? velocity velocity (A) (B) (A) Acceleration decreases and speed 1 2 3 4 5 time 1 2 3 4 5 time increases velocity velocity (B) Acceleration decreases and speed (C) (D) decreases (C) Acceleration is constant and speed increases (D) Acceleration increases and speed increases [  ] 1 2 3 4 5 time 1 2 3 4 5 time  [  ] Chapter 2 | Kinematics 13

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 (k) The minimum velocity of the ball Assume that air resistance is negligible. during its flight (p) Now, if the effects of air resistance (l) The time that this minimum velocity were taken into account, explain occurs what would happen. (m) The time taken for the ball to return 2 2. This question is about sketching s-t graphs to the ground A compressible rubber ball is dropped (n) The velocity of the ball as it strikes from rest, from a height x, above the the ground ground level. It bounces off three times from the ground. Sketch the s-t graph (o) The horizontal range of the ball for the motion. Take downwards to be positive. Neglect air resistance. Intermediate 1. This question is about graph sketching 3. This question is about projectile motion A sledge slides down an icy slope with A ball P is projected horizontally with a a constant acceleration. If it travels a speed of 2 ms−1 from the edge of a table. At distance s in time t, which of the following the same time, another ball Q is dropped pairs of quantities would give a straight from the same height. Identify the correct line graph when plotted to represent the statement. motion of the sledge? (A) P will hit the floor before Q (A) s vs t (B) Q will hit the floor before P t3 (C) Q will have a greater kinetic energy (C) s vs 1 than P just before hitting the floor. t2 (D) P will have a greater kinetic energy (B) s vs t than Q just before hitting the floor. t  [  ] (D) s vs t [  ] 4. This question is about straight line motion t2 A stone is thrown vertically upwards at 2. This question is about equations of motion the same time as another stone is dropped from rest from a height h0 directly above Two identical metal spheres are dropped the first stone. from rest from different heights at the same instant. As the stones accelerate (a) If the initial velocity of the first stone downwards, the distance between them is u, find an expression for time ‘t’ will when they meet. (A) keep decreasing until they collide (b) If the two stones were to have the (B) keep increasing same speed at the time they meet, express u in terms of h0. (C) stay constant (D) decrease initially and then stay constant [  ] 16 © Fairfield Book Publishers A Level Physics Question Bank

360_AL022 PhysicsQuestionBank_8thPass(Final) 09/03/20 Advanced 1. This question is about acceleration-time graphs 3. This question is about deceleration The variation of acceleration with time of a vehicle is shown below. If it is travelling A train A spots another train, B, 80 m on a straight road, identify the part of the ahead, moving in the same direction graph when the vehicle has the greatest as train A. If the train A is moving at velocity. a speed of 100 km/h and the train B is travelling with a speed of 50 kmh−1, what acceleration deceleration must train A apply in order to avoid a collision, assuming that train (B) A presents the brake immediately after spotting train B. (A) time 4. This question is about acceleration (C) A lift accelerates upwards from rest with an acceleration of 2 ms−2. At the moment (D) when its speed is 2 ms−1 a loose nut drops from rest from the ceiling. Find the time 2. This question is about acceleration taken for the nut to hit the floor of the lift, if the distance between ceiling and floor A hot air balloon loaded with stones is is 2 m. accelerating downwards with a constant acceleration of 1 g, where g is acceleration 5. This question is about projectile motion The diagram shows a brick sliding from 4 rest along a smooth roof inclined to the horizontal at an angle of 30°. While due to gravity. If the total mass of the sliding, the brick experiences a frictional force of 0.5N. The brick of mass 0.3 kg balloon is M, what mass of the stones slides a distance of 4 m before falling off the roof. If the edge of the slope is 5.8 m must be removed in order that the balloon from the ground, determine, now accelerates upwards with 1 g? 4m 4 30° (A) 1 M 3 5.8 m (C) 2 M 3 (B) 2 M 5 (D) 3 M [  ] 5 (a) the speed of the brick before if falls freely, (b) the time taken for the free fall, 20 © Fairfield Book Publishers A Level Physics Question Bank