If the sun rays are indenting at \(60^\circ\) angle and intensity is \(I.\) If the sun rays are made incident at \(30^\circ\) angle, then what will be the intensity?
1. \(\frac{I}{\sqrt3}\)
2. \(\sqrt3 I\)
3. \(3I\)
4. \(\frac{I}{3}\)
The reason for current flow in the p-n junction in forward bias is:
1. | drifting of charge carriers |
2. | drifting of minority charge carriers |
3. | diffusion of charge carriers |
4. | all of the above |
A charged particle is accelerated by a potential of 200 V. If its velocity is 8.4 × 108 m/s, then the value of e/m for that particle is:
1. 17.6 × 1016
2. 14.5 × 1012
3. 1.76 × 1015
4. 1.45 × 1015
When an open organ is dipped in water up to half of its height, then its frequency will become:
1. half
2. double
3. remain same
4. four times
A sound source producing waves of frequency 300 Hz and wavelength 1 m observer is stationary, while the source is going away with the velocity 30 m/s, then apparent frequency heard by the observer is:
1. 270 Hz
2. 273 Hz
3. 383 Hz
4. 300 Hz
A particle moves towards east for 2 s with velocity 15 m/s and move towards north for 8 s with velocity 5 m/s. Then, the average velocity of the particle is:
1. 2 m/s
2. 5 m/s
3. 7 m/s
4. 10 m/s
Relation between a wavelength of photon and electron of same energy is:
1. \( \lambda_{p h}>\lambda_e \)
2. \( \lambda_{p h}<\lambda_e \)
3. \( \lambda_{p h}=\lambda_e\)
4. \(\frac{\lambda_e}{\lambda_{p h}}=\text { constant }\)
Match the following.
A. | Angular momentum | 1. | [M-1L2T-2] |
B. | Torque | 2. | [M1T-2] |
C. | Gravitational constant | 3. | [M1L2T-2] |
D. | Tension | 4. | [M1L2T-1] |
1. C-2, D-1
2. A-4, B-3
3. A-3, C-2
4. B-2, A-1
If we increase the kinetic energy of a body by 300%, then percent increase in its momentum is:
1. 50%
2. 300%
3. 100%
4. 150%
Change in acceleration due to gravity is same at height h above the Earth surface and depth \(x ,\) then relation between \(x\) and \(h\) is: (\(h\) and \(x<<R_e\))
1. \(x=h\)
2. \(x=2h\)
3. \(x=\frac h2\)
4. \(x=h^2\)