An object is resting at the bottom of two strings which are inclined at an angle of 120° with each other. Each string can withstand a tension of 20 N. The maximum weight of the object that can be supported without breaking the string is

1) 5 N

2) 10 N

3) 20 N

4) 40 N

The coefficient of volume expansion of glycerin is 34 ´ 10^–5 per °C. The fractional change in its density for a 30°C rise in temperature is:

1) 2.02 ´ 10^–2

2) 1.86 ´ 10^–2

3) 1.02 ´ 10^–2

4) 0.86 ´ 10^–2

  In the electric field experiment, along an electric field line the double pronged DVM probe:

(1) Always points directly to one of the electrodes.

(2) Will read zero.

(3) Will read a minimum.

(4) Will read a maximum.

The mass of O₂ molecules is 16 times that of H₂ molecules. The rms velocity of O₂ molecules at room temperature is Crms The rms velocity of H₂ molecules at the same temperature will be

1) 16 C_rms
2) 4 C_rms
3) C_rms / 4
4) C_rms / 16

Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is + 4Q. We move the +Q and +4Q charges to be 3 times as far apart as they were. What is the magnitude of the force on the +4Q charge ?

1) F
2) 4F
3) 4F/3
4) 4F/9

A stone falls under gravity. It covers distances h1, h2, h3 in the first 5 seconds, next 5 seconds and the next 5 seconds respectively. The relation between h₁, h₂ ,h₃ is.
1) h₁ =2h₂ =3h₃
2) h₁ = h₂/3 = h₃/5
3) h₂ =3h₁ and h₃ = 3h₂
4) h₁ =h₂ =h₃

A small ball of density ρ is immersed in a liquid of density (σ>ρ)(σ>ρ) to a depth hh and released. The height above the surface of water up to which the ball will jump, is:

1) $$\left ( \dfrac{\rho }{\sigma }-1 \right )h$$
2) $$\left ( \dfrac{\rho }{\sigma }+1 \right )h$$
3) $$\left ( \dfrac{\sigma }{\rho }-1 \right )h$$
4) $$\left ( \dfrac{\sigma }{\rho }+1 \right )h$$

If the frequency (F), velocity (V) and density (D) are taken as fundamental quantities then the dimensional formula for momentum in this new system will be 

1) D^-1V^-4F3
2) D¹V⁴F^-3
3) D¹V¹F^-2
4) D²V²F²

A projectile is launched at a speed of 24 m/s. The parachute fails and the projectile falls (free fall) back to earth. What is the total time the projectile is in flight?
 1) 4.9 s
 2) 3.2 s
 3) 8.6 s
 4) 9.7 s

Two bodies with kinetic energies in the ratio 4:1 are moving with equal linear momentum. The ratio of their masses is

1) 1:1
2) 1:2
3) 4:1
4) 1:4