FDE EST Physics Past Paper | 21-04-2024

If a positive charge is placed between two negative charges, the system will be?

1. Stable
2. Unstable
3. Neutral
4. None of the above

In the relation E = F/q , the charge q is?

1. Always positive
2. Always negative
3. Can be positive or negative
4. Always zero

Confining a wave to oscillate in one plane is called?

1. Polarization
2. Reflection
3. Refraction
4. Diffraction

If the power of a lens is 10 and it carries a single-mode index fiber with a ratio of 14000:23, then the focal length of the lens will be?

1. 10 cm
2. 20 cm
3. 30 cm
4. 40 cm

If the radius of the Earth is reduced to one-fourth of its original value, what will happen to the escape velocity?

1. Halved
2. Doubled
3. Quadrupled
4. No change

If the mass is doubled, what will happen to both angular and linear momentum?

1. Halved
2. Doubled
3. Quadrupled
4. No change

The efficiency of a Carnot engine will be maximum if?

1. T2 is equal to zero
2. T2 is equal to room temperature
3. T2 is equal to absolute zero
4. T2 is equal to the temperature of the source

If the temperature of the cold reservoir is 12°C and the temperature of the hot reservoir is 27°C, then the efficiency of the Carnot engine is?

1. 2%
2. 5%
3. 10%
4. 15%

If Cp = 10 and Cv = 7, then the value of R is?

1. 3
2. 5
3. 7
4. 10

The speed of sound in vacuum is?

1. 0 m/s
2. 343 m/s
3. 1,480 m/s
4. 3.00 x 10^8 m/s