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

 The equation Ip = KVp ^3/2 is called :

(1) Gelusec law             (2) Newton’s law

(3) Charles law             (4) None

When a ray of light enters a glass slab from air
1. Its wavelength increase
2. No change in frequency & wavelength
3. Its frequency increases
4. No change in frequency & wavelength

A cube of wood supporting a 400 g mass just floats in water. When the mass is removed, the cube rises by 2 cm. The side of the cube is:
1. 10 cm
2. 40 cm
3.20 cm
4.4 cm

A body of mass M just starts sliding down an inclined plane ( rough) with inclination θ. such that tanθ=1/3. The force acting on body down the plane in this position is

1) Mg
2) Mg/3
3) (2/3)Mg
4) Mg/√10

200 MeV of energy may be obtained on the fission of one atom of the U²³⁵ isotope. A reactor using  U²³⁵ as fuel is generating 1000 kW of power. The rate of nuclear fission in the reactor is

1) 1000s−1
2) 1.38×10⁹s⁻¹
3)  3.125×10¹⁶s⁻¹
4) 931s⁻¹

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then

1) each emitted electron carries one quarter of the initial energy
2) number of electrons emitted is half the initial number
3) each emitted electron carries half the initial energy
4) number of electrons emitted is a quarter of the initial number

Light with an energy flux of 18W/cm² falls on a non-reflecting surface at normal incidence. The pressure exerted on the surface is:

1) 2N/m²
2) 2 × 10⁻⁴ N/m²
3) 6 N/m²
4) 6 × 10⁻⁴ N/m²

 The cause of great shine in a diamond is :

(1) diffusion

(2) total internal reflection

(3) diffraction

(4) reflection

A temporary magnet should be made from
 
 (1) Copper
 (2) Steel
 (3) Tin
 (4) Aluminum