Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because(a) Determination of moment of inertia is not needed which minimises the errors(b) Less observations are required(c) Comparatively less calculations(d) All the above

The materials suitable for making electromagnets should have(a) High retentivity and high coercivity(b) Low retentivity and low coercivity(c) High retentivity and low coercivity(d) Low retentivity and high coercivity

When light is refracted, which of the following does not change?

1. Wavelepgth.
2. Frequency.
3. Velocity.
4. Amplitude.

The capacitance of a capacitor does not depend on:

1. The shape of the plates.
2. The size of the plates.
3. The charges on the plates.
4. The separation between the plates.

​​​​50% of the X-rays coming from a Coolidge tube are able to pass through a 0.1mm thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-rays passing through the same foil will be:

Which of the following is the correct definition of ampere?

Bernoulli's theorem is based on conservation of:

1. Momentum.
2. Mass.
3. Energy.
4. Angular momentum.

The vertical component of the earth's magnetic field is zero at a place where the angle of dip is(a) 0°(b) 45°(c) 60°(d) 90°