A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L1 when mass M is suspended from its free end. The expression for Young’s modulus is :
A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C.
Its density is : (R = 8.3 J mol–1 K–1)
Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is :
Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :
The mean free path for a gas, with molecular diameter d and number density n can be expressed as :
A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (g = 10 m/s2)
The color code of a resistance is given below 
The values of resistance and tolerance, respectively, are
When a uranium isotope 23592U is bombarded with a neutron, it generates 8936Kr, three neutrons and :
A spherical conductor of radius 10 cm has a charge of 3.2 × 10–7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere?
(1/4π∈0 = 9 × 109 Nm2/C2)
1.28 × 105 N/C
1.28 × 106 N/C
1.28 × 107 N/C
1.28 × 104 N/C