1. If an iron is marked 750 watts by 250 volts, then it was designated to take a current of
(a) 3 Amperes
(b) 9 Amperes
(c) 6 Amperes
(d) 15 Amperes
2. The blue colour of the sky is due to
(a) Polarization of light
(b) Scattering of light
(c) Reflection of light
(d) None of these
3. Geiger counter is an instrument
(a) Determine the heart beat rate
(b) To detect radioactive radiation
(c) To measure intensity of visible light
(d) To count the baggage of an airport
4. When we are looking at a rainbow in front of us, The sun must be
(a) High in the sky and is located either on our right or left
(b) In front of us
(c) Behind us
(d) None of these
5. When as the satellite is in the geostationary orbit, its
(a) Orbital distance is equal to the radius of the earth
(b) Acceleration is zero
(c) Orbital period is about 24 hours
(d) Angular velocity is zero
6. The most intense man-made light source is
(a) Master
(b) Laser
(c) Mercury Vapour Lamp
(d) Light emitting diode LED)
7. How many calories will b needed to raise the temperature of 10 grams of water from 200 to 3000?
(a) 1
(b) 10
(c) 100
(d) 200
8. The branch of biological science ” Ecology ” deals with the study of
(a) Plants in relation to their environment
(b) Animals in relation to plants
(c) All living things in relation to their environment
(d) Animals in relation to their environment
9. The film of oil and soapy water owe their brilliant colours to a combination of light reflection and
(a) Refraction
(b) Polarization
(c) Diffraction
(d) Interference
10. The solar ultraviolet rays do not harm living organism because
(a) The ozone layer of the atmosphere weakens them
(b) They are weak rays
(c) They have to pass through a thick column of the atmosphere
(d) The atmospheric nitrogen dilutes them
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