Explanation:
An anticlockwise current-pulse generated and then a clock-wise current pulse.
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A point object is placed at a distance of 10 cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the image will shift by about
|
(a) 0.4 cm away from the mirror |
(b) 0.4 cm towards the mirror |
|
(c) 0.8 cm away from the mirror |
(d) 0.8 cm towards the mirror |
A glass slab of thickness 3 cm and refractive index 3/2 is placed on ink mark on a piece of paper. For a person looking at the mark at a distance 5.0 cm above it, the distance of the mark will appear to be
|
(a) 3.0 cm |
(b) 4.0 cm |
(c) 4.5 cm |
(d) 5.0 cm |
If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time 80 gm of the same substance will reduce to 10 gm
|
(a) In 8 minutes |
(b) In 12 minutes |
(c) In 16 minutes |
(d) In 20 minutes |
A nuclear reaction given by 
represents
|
(a) g-decay |
(b) Fusion |
(c) Fission |
(d) b-decay |
Between the plates of a parallel plate capacitor a dielectric plate is introduced just to fill the space between the plates. The capacitor is charged and later disconnected from the battery. The dielectric plate is slowly drawn out of the capacitor parallel to the plates. The plot of the potential difference across the plates and the length of the dielectric plate drawn out is
|
(a)
|
(b)
|
(c)
|
(d)
|
The size of an atom is of the order of
|
(a) |
(b) |
(c) |
(d) |
