Quantity that remains unchanged in a transformer is
|
(a) Voltage |
(b) Current |
(c) Frequency |
(d) None of the above |
Quantity that remains unchanged in a transformer is
|
(a) Voltage |
(b) Current |
(c) Frequency |
(d) None of the above |
(c) Frequency
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In good conductors of electricity, the type of bonding that exists is
|
(a) Ionic |
(b) Vander Waals |
(c) Covalent |
(d) Metallic |

A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of
|
(a) 1 : 2 |
(b) 1 : 1 |
(c) 3 : 1 |
(d) 2 : 1 |
A galvanometer has a resistance of 25 ohm and a maximum of 0.01 A current can be passed through it. In order to change it into an ammeter of range 10 A, the shunt resistance required is
|
(a) 5/999 ohm |
(b) 10/999 ohm |
(c) 20/999 ohm |
(d) 25/999 ohm |
A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away
|
(a) Concave lens of 20 cm focal length |
(b) Convex lens of 20 cm focal length |
|
(c) Concave lens of 12 cm focal length |
(d) Convex lens of 12 cm focal length |
Myopia is due to
|
(a) Elongation of eye ball |
(b) Irregular change in focal length |
|
(c) Shortening of eye ball |
(d) Older age |
The sum of the reciprocals of object distance and image distance is equal to the __________ of a mirror.
The neutron was discovered by
|
(a) Marie Curie |
(b) Pierre Curie |
(c) James Chadwick |
(d) Rutherford |