Science (English Medium) Class 12 - CBSE Question Bank Solutions

Choose the correct answer from given options
The relationship between Brewster angle θ and speed of light v in the denser medium is

Cyclotron is used to ______.

Cyclotron frequency of a charged particle having charge q and mass m in a cyclotron producing magnetic field B is ______.

Total internal reflection can take place only if light is travelling from ______.

Optical fibre communication uses the principle of ______.

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if ______.

Assertion: The frequency of circular motion of a charged particle in cyclotron is independent of the mass of the particle.
Reason: Greater the mass of the particle less will be the frequency of the particle.

A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled?

Which of the following is not correct about cyclotron?

For wiring in the home, one uses Cu wires or Al wires. What considerations are involved in this?

In a cyclotron, a charged particle ______.

Verify that the cyclotron frequency ω = eB/m has the correct dimensions of [T]^–1.

Describe the motion of a charged particle in a cyclotron if the frequency of the radio frequency (rf) field were doubled.

A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is ______.

The phenomena involved in the reflection of radiowaves by ionosphere is similar to ______.

A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Figure). When observed from the face AD, the pin shall ______.

1. appear to be near A.
2. appear to be near D.
3. appear to be at the centre of AD.
4. not be seen at all.