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Hassan
1. A ball is dropped from a spacecraft revolving around the earth at a height of 120km. What will happen to the ball?
A. It will go very far in space
B. It will fall down to the earth gradually
C. It will move with the same speed tangentially to the spacecraft
D. It will go very far in space
2.If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, then the satellite will?
A. Continue to move in its orbit with the same velocity
B. Move tangentially to the original orbit with the same velocity
C. Become stationary in its orbit
D. Continue to move in its orbit with the same velocity
3.If the radius of the earth decreases by 1% and its mass remains the same, then the acceleration due to gravity?
A. Increases by 1%
B. Decreases by 1%
C. Increases by 2%
D. Increases by 1%
4.A gravitational law is also called?
A. Universal law
B. Newton’s law
C. Constant law
D. Universal law
5.If the diameter if the earth becomes twice its present value but its mass remains unchanged, then how would be the weight of an object on the surface of the earth affected?
A. 1/2 W
B. 1/3 W
C. 1/4 W
D. 1/2 W
6.At which part of the earth’s surface, the value of g is largest?
A. At the equator
B. Immediately below the equator
C. Immediately above the equator
D. At the equator
7.A body weighed 250N on the surface. Assuming the earth to be a sphere of uniform mass density, how much would it weigh half way down to the centre of earth?
A. 240N
B. 210N
C. 195N
D. 240N
8.A missile is launched with a velocity less than escape velocity. The sum of its kinetic energy and potential energy is?
A. Zero
B. Positive
C. Negative
D. Zero
9.When too many people stand on a bridge it collapses, why?
A. Due to increase in stress
B. Due to overweight
C. Due to improper construction
D. Due to increase in stress
10.For a constant force, a rope breaks due to stress. Which of the following is useful to reduce the stress?
A. Increase the length of the rope
B. Apply small force
C. Increase the cross sectional area of the rope
D. Increase the length of the rope
11.When a rope is pulled on either side, what is the stress acting on it?
A. Compressive stress
B. Tensile stress
C. Tensile stress
D. Compressive stress
12.What happens when the stress applied to the body is increased beyond the maximum value and is removed after some time?
A. The body will come back to its original position
B. The body will oppose the stress
C. The body becomes hot
D. The body will come back to its original position
13.A pendulum A oscillating continuously comes to rest after some time. Now make both pendulums A and B to oscillate simultaneously. What will happen?
A. A comes to rest earlier than B
B. B comes to rest earlier than A
C. A and B comes to rest simultaneously
D. A comes to rest earlier than B
14.What will happen to the elastic property of Gold when Potassium is added to gold?
A. The elastic property of gold decreases
B. The elastic property of gold remains unaltered
C. The elastic property of gold increases
D. The elastic property of gold decreases
15.A copper wire of length 3m and 1mm diameter is subjected to a tension of 5N. Calculate the elongation produced, if the young’s modulus of copper is 120GPa.
A. 15m
B. 1800m
C. 0.125 ×10-3 m
D. 15m
16.The modulus of rigidity and Poisson’s ratio of the wire are 2.87 × 1010 N/m2 and 0.379 respectively. What is the value of young’s modulus of the material of the wire.
A. 1.08773 × 1010 N/m2
B. 7.915 × 1010 N/m2
C. 7.5725 × 1010 N/m2
D. 1.08773 × 1010 N/m2
17.What is the effect of hammering on elasticity of materials?
A. Has no effect on elasticity
B. Decreases the elasticity
C. Increases the elasticity
D. Has no effect on elasticity
18.What is the effect of annealing on elasticity of materials?
A. Increases the elasticity
B. Decreases the elasticity
C. Has no effect on elasticity
D. Increases the elasticity
19.Which type of elasticity is involved in tangential push on the upper face of a block?
A. Bulk modulus
B. Young’s modulus
C. Rigidity modulus
D. Bulk modulus
20.Which is more elastic?
A. Water
B. Air
C. Solid
D. Water
21.The following wires are made of the same material. Which of these will have the largest extension, when the same tension is applied?
A. Length = 50cm, diameter = 0.5mm
B. Length = 100cm, diameter = 1mm
C. Length = 200cm, diameter = 2mm
D. Length = 50cm, diameter = 0.5mm
22.A cube is subjected to a uniform volume compression. If the side of the cube decreases by 2%, the bulk strain is?
A. 0.02
B. 0.03
C. 0.04
D. 0.02
23.Energy stored in stretching a string per unit volume is?
A. 1/2×stress×strain
B. stress×strain
C. Y(Strain)2
D. 1/2×stress×strain
24.According to Hooke’s law of elasticity, if stress is increased, the ratio of stress to strain?
A. Increased
B. Decreased
C. Becomes zero
D. Increased
25.If in a wire of Young’s modulus Y, longitudinal strain is produced, then the value of potential energy stored in its unit volume will be?
A. YX2
B. YX2
C. 2YX2
D. YX2
26.A stretched rubber has?
A. Increased kinetic energy
B. Increased potential energy
C. Decreased kinetic energy
D. Increased kinetic energy
27.The breaking stress of a wire depends upon?
A. Length of the wire
B. Radius of the wire
C. Material of the wire
D. Length of the wire
28.Which of the following affects the elasticity of a substance?
A. Hammering and annealing
B. Change in temperature
C. Impurity in substance
D. Hammering and annealing
29.The diameter of brass rod is 4mm. Young’s modulus of brass is 9×109 N/m2. The force required to stretch 0.1% of its length is?
A. 360Ï€N
B. 36N
C. 36π×105 N
D. 360Ï€N
30.If the stress is S and the Young’s modulus is Y of material of a wire, the energy stored in the wire per unit volume is?
A. 2Y/S
B. S/2Y
C. 2S2 Y
D. 2Y/S
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