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Hassan
1.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
2.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
3.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
4.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
5.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
6.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
7.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
8.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
9.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
10.When do ionic compounds conduct electricity?
A. In gaseous state
B. In solid state
C. When dissolved in water
D. In gaseous state
11.Which of the following covalent compounds conduct electricity?
A. Silica
B. Graphite
C. Diamond
D. Silica
12.Which of the following is a crystalline solid?
A. Anisotropic substances
B. Isotropic substances
C. Supercooled liquids
D. Anisotropic substances
13.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
14.Which of the following has body centered cubic structure?
A. Polonium
B. Copper
C. Nickel
D. Polonium
15.What is the possible number of different types of lattices (3D)?
A. 4
B. 8
C. 14
D. 4
16.What is the lattice constant for FCC crystal having atomic radius 1.476 Ã…?
A. 1.476 Ã…
B. 4.1748 Ã…
C. 5.216 Ã…
D. 1.476 Ã…
17.The interplanar spacing of (220) planes of a FCC structure is 1.7458 Ã…. Calculate the lattice constant.
A. 4.983 Ã…
B. 2.458 Ã…
C. 0
D. 4.983 Ã…
18.Iron has a BCC structure with atomic radius 0.123 Ã…. Find the lattice constant.
A. 0
B. 4.587 Ã…
C. 2.314 Ã…
D. 0
19.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
20.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
21.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
22.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
23.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
24.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
25.What is the ration of the force of attraction between two bodies kept in the air and the same distance apart in the water?
A. 2:1
B. 1:2
C. 1:1
D. 2:1
26.If the density of the planet is doubled without any change in its radius, how does g change on the planet?
A. It remains the same
B. It is tripled
C. It reduces
D. It remains the same
27.A man waves his arm while walking. This is?
A. To keep constant velocity
B. To ease the tension
C. To increase the velocity
D. To keep constant velocity
28.Kepler’s second law is based on?
A. Newton’s first law
B. Newton’s second law
C. Special theory of relativity
D. Newton’s first law
29.For a satellite escape velocity from the earth is 11.2 km/s. If a body is to be projected in a direction making an angle 45° to the vertical, then what is the escape velocity?
A. 11.2×2km/s
B. 11.2km/s
C. 11.2×√2km/s
D. 11.2×2km/s
30.If earth loses its gravity, then for a body?
A. A weight becomes zero, but not the mass
B. Mass becomes zero but not weight
C. Neither mass nor weight becomes zero
D. A weight becomes zero, but not the mass
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