General Quiz 1

A wave with higher frequency will have its successive wavefronts closer to each other.

Correct choice: B

Soundwaves are generaly longitudinal. They can be both transverse and longitudinal in solids.

Electromagnetic waves, including light waves, are always transverse.

Correct choice: B

When two identical waves interfere with each other, if they are in phase, they will interfere constructively, i.e. the resultant wave will be enhanced.

If the waves are $180^circ$ out of phase, they will destroy each other. The resultant will be a flat line.

Correct choice: D

The time period of a satellite is given as:

It does not depend on the mass of the satellite.

Correct choice: A

The feeling of weightlessness comes due to lack of normal support reaction.

Correct choice: B

The sound wave has a greater speed in water than in air. Hence it will bend away from the normal.

The light wave has a lesser speed in water than ir air. Hence it will bend towards the normal.

Gravitational field is defined as gravitational force per unit variable mass.

The correct units are:

The gravitational force from the Sun is not the only gravitational force experienced by a planet.

The net gravitational force on a planet is not always tangential to the orbital velocity of the planet.

Two wavesin order to be coherent, must:

1. be in the same medium.

2. have the same speed.

3. have the same frequency.

4. have a constant phase difference over time.

According to Doppler effect, the apparent frequency compared to the actual frequency is:

More when the source and the observer are moving away from each other.

Less when the source and the observer are moving towards each other.

The formula for bright fringes in Young’s Double Slit Experiment is:

Angular separation in radians.

Here $n=1$.

After converting the angle into degrees, the correct answer will be 0.23.

The diffraction grating formula for brigt fringe is:

If the grating width is $w$ and the number of lines is $N$,

then

For the first bright fringe $n=0$.

The correct answer in nano meters with 3 digits is 435.