The diffraction effect can be observed in
|
(a) Only sound waves |
(b) Only light waves |
|
(c) Only ultrasonic waves |
(d) Sound as well as light waves |
(d) Sound as well as light waves
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In the circuit shown in figure, the current drawn from the battery is 4A. If 10 W resistor is replaced by 20 W resistor, then current drawn from the circuit will be
|
(a) 1 A |
(b) 2 A |
(c) 3 A |
(d) 0 A |
Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance R = 0.5 ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is
|
(a) 1.28 watt |
(b) 2.0 watt |
(c) |
(d) 3.2 watt |
Moment of inertia of a magnetic needle is 40 gm-cm2 has time period 3 seconds in earth's horizontal field = 3.6 
weber/m2. Its magnetic moment will be
(a) 0.5 
|
(b) 5
|
(c) 0.250
|
(d) 5 
|
The magnitude of saturation photoelectric current depends upon
|
(a) Frequency |
(b) Intensity |
(c) Work function |
(d) Stopping potential |
If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be
|
(a) 3.2 × 10–10 J |
(b) 3.2 × 10–18 J |
(c) 1 N |
(d) 1 dyne |
Characteristic X-rays are produced due to
|
(a) Transfer of momentum in collision of electrons with target atoms |
|
(b) Transition of electrons from higher to lower electronic orbits in an atom |
|
(c) Heating of the target |
|
(d) Transfer of energy in collision of electrons with atoms in the target |
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is
|
(a) |
(b) |
(c) |
(d) |
