MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your LPU NEST knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Electromagnetic waves are transverse in nature is evident by |
| A. | polarisation. |
| B. | interference, |
| C. | reflection. |
| D. | diffraction. |
| Answer» B. interference, | |
| 2. |
Which of the following has maximum penetrating power? |
| A. | Ultraviolet radiation |
| B. | Microwaves |
| C. | γ-rays |
| D. | Radio waves |
| Answer» D. Radio waves | |
| 3. |
In an experiment on photoelectric effect photons of wavelength 300 nm eject electrons from a metal of work function 2.25 eV. A photon of energy equal to that of the most energetic electron corresponds to the following transition in the hydrogen atom: |
| A. | n = 2 to n = 1 state. |
| B. | n = 3 to n = 1 state. |
| C. | n = 3 to n = 2 state. |
| D. | n = 4 to n = 3 state. |
| Answer» D. n = 4 to n = 3 state. | |
| 4. |
A fan of moment of inertia I is set into rotation at time t = 0 with constant power P. Then |
| A. | the angular speed of the fan is proportional to t. |
| B. | the angular acceleration of the fan remains constant. |
| C. | the magnitude of the angular displacement is proportional to t 2 |
| D. | the magnitude of the torque is proportional to t −1/2 |
| Answer» E. | |
| 5. |
A uniform block of mass m resting on a rough horizontal plane just starts moving when pulled by a string with a force of magnitude mg making an angle of 45◦ with the horizontal. Then the block will move if it is |
| A. | pulled by a horizontal force of magnitude mg. |
| B. | pulled by a force of magnitude mg making an angle of 30◦ with the horizontal. |
| C. | pushed by a force of magnitude mg making an angle of 45◦ with the horizontal. |
| D. | pulled by a force of magnitude mg making an angle 60◦ with the horizontal. |
| Answer» E. | |