Multiple choice question for engineering
1. A boy carrying a box on his head is walking on a level load from one place to another on a straight road is doing no work. The statement is
c) Partly correct
d) Insufficient data
2. Kinetic energy with any reference must be
d) Either negative or positive
3. The kinetic energy of a body becomes four times of its initial value, then new momentum will
a) Become twice its initial value
b) Become thrice its initial value
c) Become four times its initial value
d) Remains constant
4. The decrease in potential energy of a ball of mass 20kg, which falls from a height of 50cm, is
5. If the water falls from a dam into a turbine wheel 19.6m below, then the velocity of water at the turbine is (g=9.8m/s)
6. Momentum is conserved in all collisions but not kinetic energy. True or false?
7. Two particles are seen to collide and move jointly together after the collision. During such a collision, for the total system,
a) Neither the mechanical energy nor the linear momentum is conserved
b) Mechanical energy is conserved, but not the linear momentum
c) Both the mechanical energy and the linear momentum are conserved
d) Linear momentum is conserved, but not the mechanical energy
8. In elastic collision, 100% energy transfer takes place when
b) m1 is greater than m2
c) m1 is lesser than m2
9. Assertion: In and elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of collision of balls [Reason:] Energy spent against friction does not follow the law of conservation of energy
a) Both assertion and reason are true and reason is the correct explanation of the assertion
b) Both assertion and reason are true but reason is not the correct explanation of the assertion
c) Both assertion and reason are false
d) Assertion is true but the reason is false
10. When a body moves with a constant speed along a circle
a) No work is done on it
b) No acceleration is produced in it
c) Its velocity remains constant
d) No force acts on it
1. Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. After sometime, the
a) Pressure will increase
b) Pressure remains the same
c) Pressure will decrease
d) Pressure may increase or decrease
2. Twp cylinders of equal size are filled with equal amount of ideal diatomic gas at room temperature. Both the cylinders are fitted with pistons. In cylinder A the piston is free to move, while in cylinder B the piston is fixed. When same amount of heat is added to cylinder A raises by 20 K. What will be the rise temperature of gas in cylinder B?
3. A gas does work during adiabatic expansion. The source of mechanical energy so produced is the internal energy of the gas itself. True or false?
4. Out of solid, liquid and gas of the same mass and at the same temperature, which one has the greatest internal energy?
d) All three have the same internal energy
5. Out of solid, liquid and gas of the same mass and at the same temperature, which one has the least internal energy?
d) All three have the same internal energy
6. If Cp and Cv are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation Cp-Cv=R is exact for
a) Ideal and real gases at all pressures
b) Ideal gas at all pressures and real gas at moderate pressure
c) Ideal gas and nearly true for real gases at high pressure
d) Ideal gas and nearly true for real gases at moderate pressure
7. In an adiabatic process, the quantity which remains constant is
d) Total heat of the system
8. Assertion: In an isolated system, the entropy increases [Reason:] The processes in an isolated system are adiabatic
a) Both assertion and reason are true and reason is correct explanation of the assertion
b) Both assertion and reason are true but reason is not correct explanation of the assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false
9. The efficiency of a Carnot engine operating with reservoir temperatures kept at 100 °C and -23°C will be
10. A Carnot engine, whose sink is at 300 K, has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase the efficiency by 50% of original efficiency?
a) 380 K
b) 275 K
c) 325 K
d) 250 K
1. Force is a polar vector. True or false?
2. A body is moving along a straight path. What will happen to the body in the absence of external field?
a) It will stop
b) It will move with the same speed in a different path
c) It will move with the same speed along the same straight path
d) It will move with a reduced speed along the same path
3. A person is standing in a bus. When the bus starts moving forward suddenly
a) The person moves forward
b) The person remains stationary
c) The person is unaffected
d) The person moves backward
4. When a moving bus suddenly stops, a person sitting
a) Stands up
b) Falls forward
c) Falls backward
d) Is unaffected
5. If a body has more mass, it had more inertia. True or false?
6. Which of the following is also known as law of inertia?
a) Newton’s second law of motion
b) Newton’s third law of motion
c) Aristotelian law of motion
d) Newton’s first law of motion
7. When we shake the branch of a tree, its fruits and dry leaves fall down. This is an example for
a) Inertia of motion
b) Inertia of rest
c) Inertia of direction
d) Newton’s third law of motion
8. A ball thrown upward in a moving train does not come back into the thrower’s hand. True or false?
9. A dog is chasing a hare and the hare runs in zigzag path. What happens?
a) The dig becomes confused
b) The dog catches the hare easily
c) It becomes difficult for the dog to catch the hare
d) The hare dies
10. The driver of a car suddenly sees a broad wall in front of him. He should
a) Brake sharply
b) Turn sharply
c) Keep going
d) Jump out of the car
1. Internal force is responsible for change in velocity of an object. True or false?
2. Internal force holds together the particles as a single object. True or false?
3. A hammer is resting on a plane surface. If force P is applied on the hammer along a line not passing through its centre of mass, them the hammer
a) Moves along a straight line path
b) Stays still
c) Is thrown away
d) Rotates about its centre of mass
4. The point where whole weight may be assumed to act is called
a) Centre of mass
b) Centre of weight
c) Centre of gravity
d) Centre of acceleration
5. The Sun’s attraction of both earth and moon are external forces acting on the centre of mass of the earth-moon system. True or false?
6. Which of the following retain their relative positions even when they move under the action of an external force?
a) Rotation body
b) Stationary body
c) Rigid body
d) A body in equilibrium
7. On the application of a constant torque, a wheel is turned from rest through 400 radians in 10s. Find the angular acceleration.
a) 6 rad/s2
b) 4 rad/s2
c) 2 rad/s2
d) 8 rad/s2
8. A ball of mass 2kg and another of mass 4kg are dropped together from a 60feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ration of
9. How much water a pump of 2kW can raise in one minute to a height of 10m? (g=10m/s2)
10. A body of mass 2kg is placed on a rough horizontal plane. The coefficient of friction between body and the plane is 0.2. Then,
a) Body will move in forward direction if F=3N
b) Body will move in backward direction with acceleration of 0.5m/s2, if force F=3N
c) If F=3N, then body will be in rest condition
d) The body will move both in forward during a particular period and then remain at rest
1. When we steer a bicycle round a bend with both our hands on the handle bars, we apply a
2. Couple cannot produce a translational motion. True or false?
3. The areal velocity of a planet is constant. This is stated by
a) Newton’s third law of motion
b) Kepler’s second law of planetary motion
c) Fourier’s law
d) Kirchhoff’s planetary law
4. The internal torque on the system due to internal force is
5. Which of the following can execute both translational and rotational motion under the influence of external field?
a) Rigid body
b) Ideal body
c) Rotating body
d) A body which is stationary
6. For a body in equilibrium, the linear acceleration of its centre of mass would be zero and also the angular acceleration of the rigid body about any axis would be zero. True or false?
7. A spring 40mm ling is stretched by the application of force. If 10N force is required to stretch the spring through 1mm, then the work done in stretching the spring through 40mm is
8. Two bodies w=of masses m and 4m are moving with equal kinetic energies. The ratio of their linear momenta is
9. Water falls from a height of 60m at the rate of 15kg.s to operate a turbine. The losses due to friction forces are 10% of energy. How much power is generated by the turbine? g=m/s2
10. A shell explodes into four unequal parts. Which one of the following is conserved?
a) Potential energy
b) Kinetic energy
d) Both potential and kinetic energy