1. Which mirror is used as a rear view mirror in the vehicles ?
(a) Plane
(b) Convex
(c) Concave
(d) Plano concave
2. The filament of an electric bulb is made of
(a) copper
(b) aluminium
(c) lead
(d) tungsten
3. The reason of mirage is
(a) interference of light
(b) diffraction of light
(c) polarisation of light
(d) total internal reflection of light
4. The colour of light is determined by its
(a) amplitude
(b) wavelength
(c) intensity
(d) velocity
5. Ultrasonics are sound waves of frequency
(a) greater than 20,000 Hz
(b) less than 10,000 Hz
(c) equal to 1000 Hz
(d) None of these
6. Laser is a device for producing
(a) spontaneous radiation
(b) dispersed radiation
(c) scattered radiation
(d) stimulated radiation
7. MRI stands for ?
(a) Magnetic Record of Intestines
(b) Magnetic Recording of Investigations
(c) Magnetic Resonance Imaging
(d) Magnetic Resonance in Intestines
8. When ice melts, then the
(a) volume increases
(b) volume decreases
(c) mass increases
(d) mass decreases
9. What type of electromagnetic radiation is used in the remote control of a television ?
(a) Infrared
(b) Ultraviolet
(c) Visible
(d) None of these
10. A 100 watt bulb is kept switched ON for four hours. The units of electrical energy consumed is
(a) 400 unit
(b) 25 unit
(c) 4 unit
(d) 0.4 unit
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