Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
|
(a) 1.0 mm |
(b) 0.1 mm |
(c) 0.05 mm |
(d) 0.01 mm |
Peltier co-efficient of a thermo couple is 2 nano volts. How much heat is developed at a junction if 2.5 amp current flows for 2 minute
|
(a) 6 ergs |
(b) 6 |
(c) 16 ergs |
(d) 6 |
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is
| (a) 180 cm | (b) 90 cm | (c) 85 cm | (d) 170 cm |
Four charges are placed on corners of a square as shown in figure having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be
|
(a) 1.02 |
(b) 2.04 |
|
(c) 2.04 |
(d) 1.02 |
The valence of an impurity added to germanium crystal in order to convert it into a P-type semi conductor is
|
(a) 6 |
(b) 5 |
(c) 4 |
(d) 3 |
The resistance of 1 A ammeter is 0.018 Ω . To convert it into 10 A ammeter, the shunt resistance required will be
|
(a) 0.18 Ω |
(b) 0.0018 Ω |
(c) 0.002 Ω |
(d) 0.12 Ω |
The current through a 4.6 H inductor is shown in the following graph. The induced emf during the time interval t = 5 milli-sec to 6 milli-sec will be
|
(a) 103 V |
(b) – 23 × 103 V |
(c) 23 × 103 V |
(d) Zero |
