- AStraight line
- BParabola
- ✓Hyperbola
- DCircle
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Unit of radioactivity is Rutherford. Its value is
|
(a) 3.7 |
(b) 3.7 |
|
(c) 1.0 |
(d) 1.0 |
The magnetic moment of atomic neon is
| (a) Zero | (b) μB/2 | (c) μB | (d) 3μB/2 |
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
|
(a) 4h, 9000 |
(b) 3h, 14000 |
(c) 3h, 235 |
(d) 3h, 50 |
A photodetector is made from a semiconductor In 0.53Ga 0.47As with Eg = 0.73 eV. What is the maximum wavelength, which it can detect
|
(a) 1000 nm |
(b) 1703 nm |
(c) 500 nm |
(d) 173 nm |
For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is
|
(a) 1.38 V |
(b) 1.68 V |
(c) 2.04 V |
(d) 3.10 V |
A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)
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(a) 1 |
(b) 2 |
(c) 5 |
(d) 10 |
Assertion : In photoelectric effect, on increasing the intensity of light, both the number of electrons emitted and kinetic energy of each of them get increased but photoelectric current remains unchanged.
Reason : The photoelectric current depends only on wavelength of light.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(d) If the assertion and reason both are false. |
In order to increase the sensitivity of a moving coil galvanometer, one should decrease
|
(a) The strength of its magnet |
(b) The torsional constant of its suspension |
|
(c) The number of turns in its coil |
(d) The area of its coil |