Q. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is -
1) Reflection
2) Total internal reflection
3) Scattering
4) Interference
Q. A lens has a power of + 2.0 Diopter. Which one of the following statements about the lens is true?
1) The lens is concave and has a focal length of 0.5 meter
2) The lens is convex and has a focal length of 0.5 meter
3) The lens is convex and has a focal length of 0.5 meter
4) The lens is concave and has a focal length of 2.0 meter
Q. Which one of the following was the first mineral acid discovered?
1) Sulphuric acid
2) Hydrochloric acid
3) Nitric acid
4) Phosphoric acid
Q. In case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is not correct?
1) The image will be virtual
2) The image will be enlarged or magnified
3) The image will be formed at infinity
4) The image will be erect
Q. In an incandescent electric bulb, the filament of the bulb is made up of which metal?
1) Aluminium
2) Copper
3) Tungsten
4) Silver
Q. Which one of the following is not the unit of energy?
1) Joule
2) Watt-hr
3) Newton-metre
4) kg-metre/sec2
Q. Two planets orbit the Sun in circular orbits, with their radius of orbit as R1 = R and R
1) 1/ 16
2) 1/ 8
3) 1/ 4
4) 1/ 2
Q. A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to -
1) 20 Ω
2) 10 Ω
3) 5 Ω
4) 15 Ω
Q. Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become -
1) double
2) half
3) four times
4) one fourth
Q. Which one of the following statements about sound is not correct?
1) Sound travels at a speed slower than the speed of light
2) Sound waves are transverse waves
3) Sound waves are longitudinal waves
4) Sound travels faster in moist air than in dry air
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