A missile is fired for a maximum range with an initial velocity of \(20~\text {m/s}.\) If \(g=10~\text{m/s}^2,\) then the range of the missile will be:
| 1. | \(50~\text m\) | 2. | \(60~\text m\) |
| 3. | \(20~\text m\) | 4. | \(40~\text m\) |
The current \(i\) in a coil varies with time as shown in the figure. The variation of induced emf with time would be:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
An AC voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3 , the phase difference between the applied voltage and the current in the circuit is:
1.
2.
3. zero
4.
Force \(F\) on a particle moving in a straight line varies with distance \(d\) as shown in the figure. The work done on the particle during its displacement of \(12\) m is:
1. \(21\) J
2. \(26\) J
3. \(13\) J
4. \(18\) J
| 1. | \(-F\) | 2. | \(F\) |
| 3. | \(2F\) | 4. | \(-2F\) |
| 1. | gamma rays, ultraviolet, infrared, microwaves. |
| 2. | microwaves, gamma rays, infrared, ultraviolet. |
| 3. | infrared, microwave, ultraviolet, gamma rays. |
| 4. | microwave, infrared, ultraviolet, gamma rays. |
A transistor is operated in a common emitter configuration at Vc =2 V such that a change in the base current from 100 to 300 produces a change in the collector current from 10 mA to 20mA. The current gain is:
1. 75
2. 100
3. 25
4. 50
A body of mass \(M\) hits normally a rigid wall with velocity \(v\) and bounces back with the same velocity. The impulse experienced by the body is:
1. \(1.5Mv\)
2. \(2Mv\)
3. zero
4. \(Mv\)
A uniform electric field and a uniform magnetic field are acting in the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron:
| 1. | speed will decrease |
| 2. | speed will increase |
| 3. | will turn towards the left of the direction of motion |
| 4. | will turn towards the right of the direction of motion |
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