X-rays which can penetrate through longer distances in substance are called
|
(a) Soft X-rays |
(b) Continuous X-rays |
(c) Hard X-rays |
(d) None of the above |
(c) Hard X-rays
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The direction of induced e.m.f. during electromagnetic induction is given by
|
(a) Faraday's law |
(b) Lenz's law |
(c) Maxwell's law |
(d) Ampere's law |
In a step-up transformer the voltage in the primary is 220 V and the current is 5A. The secondary voltage is found to be 22000V. The current in the secondary (neglect losses) is
|
(a) 5 A |
(b) 50 A |
(c) 500 A |
(d) 0.05 A |
Five resistors of given values are connected together as shown in the figure. The current in the arm BD will be
|
(a) Half the current in the arm ABC |
(b) Zero |
|
(c) Twice the current in the arm ABC |
(d) Four times the current in the arm ABC |
In a hydrogen atom, the distance between the electron and proton is 2.5 
. The electrical force of attraction between them will be
|
(a) 2.8 |
(b) 3.7 |
(c) 6.2 |
(d) 9.1 |
An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is
|
(a) + 1.5 |
(b) – 1.5 |
(c) + 6.67 |
(d) – 6.67 |
The sensitivity of a tangent galvanometer is increased if
| (a) Number of turn decreases | (b) Number of turn increases |
| (c) Field increases | (d) None of the above |
