Q.1)-Nuclear sizes are expressed in a unit named
- Fermi
- angstrom
- newton
- tesla
Q.2)-Light year is a unit of
- time
- distance
- light
- intensity of light
Q.3)-Light from the Sun reaches us in nearly
- 2 minutes
- 4 minutes
- 8 minutes
- 16 minutes
Q.4)-Pa(Pascal) is the unit for
- thrust
- pressure
- frequency
- conductivity
Q.5)-Metals are good conductors of electricity because
- they contain free electrons
- the atoms are lightly packed
- they have high melting point
- All of the above
Q.6)-Stars twinkle because
- the intensity of light emitted by them changes with time
- the distance of the stars from the earth changes with time
- the refractive index of the different layers of the earth's atmosphere changes continuously, consequ
- the light from the star is scattered by the dust particles and air molecules in the earth's atmosphe
Q.7)-Pick out the scalar quantity
- force
- pressure
- velocity
- acceleration
Q.8)-Rectifiers are used to convert
- Direct current to Alternating current
- Alternating current to Direct current
- high voltage to low voltage
- low voltage to high voltage
Q.9)-which is not emitted by radioactive substance?
- Electrons
- Electromagnetic radiations
- Alpha particles
- Neutrons
Q.10)-Sound waves in air are
- transverse
- longitudinal
- electromagnetic
- polarised