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Physics Mcqs :: All Aptitude Test ::

Home » General Knowledge » Physics Mcqs » Aptitude Test - 8
1.Moment of inertia of an object does not depend upon?
A. Mass of object
B. Mass of distribution
C. Angular velocity
D. Mass of object
2.A flywheel has a mass of 25kg has a radius of 0.2m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 2rad/s2?
A. 2N
B. 5N
C. 3N
D. 2N
3.A torque of 10Nm is applied to a flywheel of mass 1kg and radius of gyration 50cm. What is the resulting angular acceleration?
A. 4 rad/s2
B. 2 rad/s2
C. 5 rad/s2
D. 4 rad/s2
4.The angular momentum of a body is 3.14 is and its rate of revolution is 10 cycles per second. Calculate the moment of inertia of the body about the axis of rotation?
A. 5 kgm2
B. 31.4 kgm2
C. 0
D. 5 kgm2
5.The angular velocity of a planet revolving in an elliptical orbit around the sun increases, when it comes closer to the sun. This is due to?
A. Conservation of momentum
B. Newton’s second law of motion
C. Conservation of angular momentum
D. Conservation of momentum
6.In a hand driven grinding machine, the handle is put?
A. Perpendicular to the stone
B. Near the circumference of the stone
C. A few distances above the stone
D. Perpendicular to the stone
7.A faulty balance with unequal arms has its beam horizontal. The weights of the two pans are?
A. Equal
B. Unequal
C. Uncertain
D. Equal
8.Which part of the ship is made heavy?
A. The whole ship should be light in weight
B. The top part
C. The bottom part
D. The whole ship should be light in weight
9.A solid sphere rolls down two different inclined planes of the same heights but different angles of inclination. In each case, the ball will reach the bottom?
A. With the same speed
B. With different speed
C. With different speed but same time
D. With the same speed
10.A solid sphere rolls down two different inclined planes of the same heights but different angles of inclination. In each case, the ball will?
A. Reach the bottom at the same time
B. Will take longer time to roll down one plane
C. Reach the bottom at an unpredictable time
D. Reach the bottom at the same time
11.A hook of radius 2m weighs 100kg. It rolls along a horizontal floor so that its centre if mass has a speed of 20cm/s. How much work has to be done to stop it?
A. 5 J
B. 6 J
C. 2 J
D. 5 J
12.Where does the centre of mass of two particles of an equal mass lie?
A. Inside the body
B. Outside the body
C. Near the first body
D. Inside the body
13.Moment of inertia of a circular wire of mass M and radius R about its diameter is?
A. 1/2 MR2
B. 1/4 MR2
C. 2MR2
D. 1/2 MR2
14.One solid sphere ‘A’ and another hollow sphere ‘B’ are of same mass and same outer radii. Their moments of inertia about their diameters are respectively IA and IB, such that?
A. IA=IB
B. IA is greater thab IB
C. IA is lesser than IB
D. IA=IB
15.Which one of the following is the property of an ionic compound?
A. High melting and boiling points
B. Low melting and boiling points
C. Weak inter-atomic forces
D. High melting and boiling points
16.When do ionic compounds conduct electricity?
A. In gaseous state
B. In solid state
C. When dissolved in water
D. In gaseous state
17.Which of the following covalent compounds conduct electricity?
A. Silica
B. Graphite
C. Diamond
D. Silica
18.Which of the following is a crystalline solid?
A. Anisotropic substances
B. Isotropic substances
C. Supercooled liquids
D. Anisotropic substances
19.Why are the glasses of building milky?
A. Because of unwanted deposits
B. Because it becomes old
C. Because it is brittle
D. Because of unwanted deposits
20.Which of the following has body centered cubic structure?
A. Polonium
B. Copper
C. Nickel
D. Polonium
21.What is the possible number of different types of lattices (3D)?
A. 4
B. 8
C. 14
D. 4
22.What is the lattice constant for FCC crystal having atomic radius 1.476 Å?
A. 1.476 Å
B. 4.1748 Å
C. 5.216 Å
D. 1.476 Å
23.The interplanar spacing of (220) planes of a FCC structure is 1.7458 Å. Calculate the lattice constant.
A. 4.983 Å
B. 2.458 Å
C. 0
D. 4.983 Å
24.Iron has a BCC structure with atomic radius 0.123 Å. Find the lattice constant.
A. 0
B. 4.587 Å
C. 2.314 Å
D. 0
25.Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250N on the surface?
A. 125N
B. 250N
C. 0N
D. 125N
26.Calculate the force of attraction between two balls each of mass 1kg when their centres are 10cm apart. The value of gravitational constant G = 6.67×10-11 Nm2 kg(-2).
A. 6.67×10-11N
B. 6.67×10-10N
C. 6.67N
D. 6.67×10-11N
27.If the kinetic energy of the satellite revolving in an orbit close to the earth’s surface happens to be doubled, what happens to the satellite?
A. It revolves faster
B. It revolves slower
C. It remains unaltered
D. It revolves faster
28.The escape velocity in earth is 11.2km/s. What will be its value on a planet whose radius is double the radius of the earth and eight times the mass of the earth?
A. 22.2km/s
B. 22.4km/s
C. 12km/s
D. 22.2km/s
29.A spring balance is suspended from inside an artificial satellite revolving around the earth. If a body of mass 1kg is suspended from it, what would be its reading?
A. 1
B. 2
C. Depends on the mass of the satellite
D. 1
30.A ball dropped from a spacecraft is revolving around the earth at a height of 120km. What will happen to the ball?
A. It will fall down to the earth gradually
B. It will go very far in the space
C. It will continue to move with the same speed along the original orbit of the spacecraft
D. It will fall down to the earth gradually
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