In designing, a beam for its use to support a lead. The depression at centre is proportional to (where, Yis Young’s modulus)

 

1.  Y²

^2.  Y

3.  

4.  

 

A balloon is filled at 27 °C and 1 atm pressure by 500 m³. He, At -3 °C and 0.5 atm pressure, the volume of He will be

1.  700 m³

The particle of mass 50 kg is at rest. The work done to accelerates it by 20 m/s in 10 s is

 

1.  10³ J

The moment of inertia of a circular loop of radius R, at a distance of R/2 around a rotating axis parallel to horizontal diameter of loop is

 

1.  MR²

The ratio of radius of two bubbles is 2: 1. What is the ratio excess pressure inside them?

 

1.  1: 2

In the capacitor of capacitance C, charge Q and energy W is stored. If charge is increases upto 2Q, the energy stored will be

 

1.  

The unit of thermal conductivity is

 

1.  Wm^-1K^-1

Photon and electron are given same energy (10^‑20J). Wavelength associated with photon and electron are λ_p and λ_e, the correct statement will be

 

1.  λ_p > λ_e

The half life of radioactive elements is 600 yr the fraction of sample that would remain after 3000 yr is

 

1.  1/2

A particle moves along with x-axis. The position x os particles with respect to time t from origin given by x = b₀ + b₁t + b₂t². The acceletration of particle is

 

1.  b₀