In an elastic collision

1.Energy is conserved but momentum is not
2.Momentum is conserved but energy is not
3.Neither momentum nor energy is conserved
4.Both momentum and energy is conserved

A motorcyclist rides onto a road at 22.2 m/s at 12:00 noon and maintains that speed for the rest of her journey. At 12:01 a car travelling at 27.8 m/s turns onto the road at the same point as did the motorcycle. How many seconds after the motorcycle started will it be passed by the car?

1) 48 sec
2) 102 sec
3) 298 sec
4) 78 sec

 In the definition of 'calorie', the heat required to raise the temperature of 1 gram of water through 1°C in the range of temperature and pressure.

(1) 3.5 to 4.5°C, 76mm of Hg
(2) 13.5 to 14.5°C 76mm of Hg
(3) 14.5 to 15.5°C 760mm of Hg
(4) 98.5 to 99.5°C 760mm of Hg

 A pendulum having a period of oscillation of 2 seconds is taken on a planet where g is four times that on the earth. The period of the pendulum would be

1) 4 s

2) 2 s

3) 1 s

4) ½ s

A particle is projected from the ground level. It just passes through upper ends of vertical poles A, B, C of height 20 m, 30 m and 20 m respectively. The time taken by the particle to travel from B to C is double of the time taken from A to B. Find the maximum height attained by the particle from the ground level.
1) 15 m
2) 125/4 m
3) 45/4 m
4) none

If a body of mass mm has to be taken from the surface to the earth to a height h=4R, then the amount of energy required is (R= radius of the earth)

1) mgR
2) mgR / 5.
3) 4mgR / 5
4) mgR / 12

The dimensional formula for latent heat is:

1.M⁰L² T^-2
2.M² L⁰ T^-2
3.M² L^-2 T⁰
4.M⁰ L^-2 T²

Two non-reactive monoatomic ideal gases have their atomic masses in the ratio 2 : 3. The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is 4 : 3. The ratio of their densities is

1) 1 : 4
2) 1 : 2
3) 6 : 9
4) 8 : 9

Relative permeability and relative permitivity of a medium are respectively $$4$$ and $$9$$. If the magnetic induction field of the electromagnetic wave travelling in the medium is $$4.2 \times { 10 }^{ -8 }T$$, then the magnitude of its electric field is

1) $$4.2V{ m }^{ -1 }$$
2) $$2.1\times { 10 }^{ -8 }V{ m }^{ -1 }$$
3) $$4.2\times { 10 }^{ -8 }V{ m }^{ -1 }$$
4) $$2.1V{ m }^{ -1 }$$

 A photon or quantum of light has wavelength ë and frequency f. Its energy is proportional to

1) 1/ë    2) f^1/2     3) the light intensity     4) cë