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Home » General Knowledge » Physics Mcqs » Aptitude Test - 6
1.If a machine is lubricated with oil?
A. The mechanical advantage of the machine increases
B. The mechanical efficiency of the machine increases
C. Both its mechanical advantage and efficiency increases
D. The mechanical advantage of the machine increases
2.A hammer is resting on a plane surface. If force P is applied on the hammer along with 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. Moves along a straight line path
3.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 mass
4.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. Rotation body
5.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. 6 rad/s2
6.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?
A. √2:1
B. 1:4
C. 1:2
D. √2:1
7.How much water a pump of 2kW can raise in one minute to a height of 10m? (g=10m/s2)?
A. 1000litres
B. 1200litres
C. 10litres
D. 1000litres
8.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. Body will move in forward direction if F=3N
9.When we steer a bicycle round a bend with both our hands on the handlebars, we apply a?
A. Force
B. Torque
C. Couple
D. Force
10.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. Newton’s third law of motion
11.The internal torque on the system due to internal force is?
A. Increasing
B. Decreasing
C. Constant
D. Increasing
12.Which of the following can execute both translational and rotational motion under the influence of the external field?
A. Rigid body
B. Ideal body
C. Rotating body
D. Rigid body
13.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?
A. 23J
B. 68J
C. 84J
D. 23J
14.Two bodies w of masses m and 4m are moving with equal kinetic energies. What is the ratio of their linear momenta?
A. 1:2
B. 1:1
C. 4:1
D. 1:2
15.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?
A. 7kW
B. 10.2kW
C. 12.3kW
D. 7kW
16.A shell explodes into four unequal parts. Which one of the following is conserved?
A. Potential energy
B. Kinetic energy
C. Momentum
D. Potential energy
17.If the earth stops rotating, the value of g at the equator
A. Increases
B. Decreases
C. First increases and then decreases
D. Increases
18.A satellite revolves very near to the earth surface. Its speed should be around?
A. 5km/s
B. 8km/s
C. 2km/s
D. 5km/s
19.The value of escape velocity on a certain planet is 2km/s. Then the value of orbital speed for a satellite orbiting close to its surface is?
A. 12km/s
B. 1km/s
C. √2km/s
D. 12km/s
20.If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite orbiting around the earth?
A. Time period
B. Orbiting radius
C. Areal velocity
D. Time period
21.An elephant and an ant are to be projected out of the earth into space. What is the velocity needed to do so?
A. Elephant needs to be projected with a higher velocity
B. Ant should be projected with a higher velocity
C. Both should be projected with the same velocity
D. Elephant needs to be projected with a higher velocity
22.An astronaut, while revolving in a circular orbit happens to throw a spoon outside. What will happen to the spoon?
A. It will reach the earth surface
B. It will escape the universe
C. It will remain stationary
D. It will reach the earth surface
23.A satellite orbiting the earth with speed v0. To make the satellite escape, what should be the minimum percentage increase in its velocity?
A. 41.5%
B. 44.1%
C. 41.4%
D. 41.5%
24.A particle is acted upon by a force of a constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that ?
A. Its velocity is constant and kinetic energy is constant
B. Its acceleration and velocity is constant
C. Its kinetic energy is constant and it moves in a circular path
D. Its velocity is constant and kinetic energy is constant
25.An athlete in the Olympic game covers a distance of 100m in 10s. His kinetic energy can be estimated in the range?
A. 200J – 500J
B. 2×105J – 3×105J
C. 20000J – 50000J
D. 200J – 500J
26.A particle of mass 100g is thrown vertically upwards with a speed of 5m/s. The work done by the force of gravity during the time the particle goes up is ?
A. 1.25J
B. 0.5J
C. -0.5J
D. 1.25J
27.Statement 1: Linear momentum of a system of particles is zero. Statement 2: Kinetic energy of a system of particles is zero.
A. 1 does not imply 2 and 2 does not imply 1
B. 1 implies 2 but 2 does not imply 1
C. 1 does not imply 2 but 2 implies 1
D. 1 does not imply 2 and 2 does not imply 1
28.If mass-energy equivalence is taken into account when water is cooled to form ice, the mass of water should?
A. Increase
B. Remain unchanged
C. Decrease
D. Increase
29.A body moves a distance of 10m under the action of force F = 10N. If the work done is 25 J, the angle which the force makes with the direction of motion is?
A. 0°
B. 30°
C. 60°
D. 0°
30.Two bodies of mass and 4m have equal kinetic energy. What is the ratio of their momentum?
A. 1:4
B. 1:2
C. 1:1
D. 1:4
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