
- ✓$\frac{5}{3} \mu F$
- B$\frac{3}{5} \mu F$
- C$15 \mu F$
- D$\frac{1}{15} \mu F$

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A point object O is placed on the principal axis of a convex lens of focal length f = 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is:
A conducting wire frame is placed in a magnetic field which is directed into the paper. The magnetic field is increasing at a constant rate. The directions of induced current in wires AB and CD are

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(a) B to A and D to C |
(b) A to B and C to D |
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(c) A to B and D to C |
(d) B to A and C to D |
In order to forward bias a PN junction, the negative terminal of battery is connected to
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(a) P–side |
(b) Either P–side or N–side |
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(c) N–side |
(d) None of these |
No bias is applied to a P-N junction, then the current
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(a) Is zero because the number of charge carriers flowing on both sides is same |
|
(b) Is zero because the charge carriers do not move |
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(c) Is non-zero |
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(d) None of these |
A galvanometer, having a resistance of 50 W gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97 X 10–2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = 5 Wm)
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(a) 9 |
(b) 6 |
(c) 3 |
(d) 1.5 |
To an observer on the earth the stars appear to twinkle. This can be ascribed to
|
(a) The fact that stars do not emit light continuously |
|
(b) Frequent absorption of star light by their own atmosphere |
|
(c) Frequent absorption of star light by the earth's atmosphere |
|
(d) The refractive index fluctuations in the earth's atmosphere |