Q. Radioactivity is the disintegration of the -
1) Nucleus
2) Ion
3) Molecule
4) Atom
Q. Glass is a -
1) Polymeric mixture
2) Gel
3) Super-cooled liquid
4) Micro-crystalline solid
Q. A uniform magnetic field is represented by -
1) closed curves
2) parallel lines
3) convergent lines
4) divergent lines
Q. The time taken for the sunlight to reach the earth is about -
1) 10 minutes 3.3 seconds
2) 6 minutes 5.5 seconds
3) 8 minutes 16.6 seconds
4) 9 minutes 8.8 seconds
Q. Standing in front of a special mirror, a man finds his image small head and body but legs of actual size. The shapes of mirror parts are -
1) concave and plane
2) concave and convex
3) Convex and plane
4) plane and convex
Q. The time period of a 1 m long pendulum approximates to -
1) 6 s
2) 4 s
3) 2 s
4) 1 s
Q. A ball is thrown vertically upward with a speed of 40 m/s. The time taken by the ball to reach the maximum height would be approximately -
1) 2 s
2) 3 s
3) 4 s
4) 5 s
Q. The magnetic field produced by a current-carrying straight wire at a point outside the wire depends -
1) inversely on the distance from it
2) directly on the distance from it
3) inversely at short distances and directly at large distance from it
4) directly on the distance (at short distances) and inversely on the distance (at long distances) from it
Q. What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V?
1) 0.5 A
2) 0.25 A
3) 1.0 A
4) 5.0 A
Q. The frequency of an alternating current is 3 Hz. It implies that -
1) there are 6 cycles/s
2) there are 3 cycles/s
3) there are 2 cycles/s
4) there is only 1 cycle/s
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