Q. Radiations coming form the Sun are mostly in the form of -
1) light only
2) light and long wavelength infrared
3) light and short wavelength infrared
4) both short and long wavelength infrared
Q. The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be -
1) 318 K
2) 45 K
3) 62.8 K
4) 335.8 K
Q. Compared to audible sound waves, ultrasound waves have -
1) higher speed
2) higher frequency
3) longer wavelength
4) both higher speed and frequency
Q. Which one of the following statements regarding cathode rays is not correct?
1) Cathode ray particles are electrons
2) Cathode ray particles start from anode and move towards cathode
3) In the absence of electrical and magnetic fields, cathode rays travel in straight lines
4) Television picture tubes are cathode ray tubes
Q. Light rays move in straight lines. But through an optional fiber, they can move in any type of zigzag path because -
1) the holes through the fiber are extremely fine
2) light rays are absorbed at the entry end and relieved at the exit end of the fiber
3) scattering of light occurs inside the fiber
4) successive total internal reflections occur as a ray moves through the fiber
Q. Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on -
1. Supply voltage.
2. Current passing through the coil.
3. Time for which voltage is supplied.
Select the correct answer from among the following -
1) 1, 2 and 3
2) 1 and 2 only
3) 1 only
4) 2 and 3 only
Q. The loudness of sound depends upon the -
1) velocity of sound waves in the medium
2) amplitude of the sound waves
3) frequency of the sound waves
4) frequency and velocity of the sound waves
Q. Net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called -
1) Diffusion
2) Dispersion
3) Osmosis
4) Absorption
Q. 10 g of ice at -100C is mixed with 10 g of water at 00C. The amount of heat required to raise the temperature of mixture to 100C is -
1) 400 cal
2) 550 cal
3) 1050 cal
4) 1200 cal
Q. Which one of the following statements regarding lenses is not correct?
1) A convex lens produces both real and virtual images
2) A concave lens produces both real and virtual images
3) A convex lens can produce images equal, greater and smaller than the size of the object
4) A concave lens always produces images smaller than the size of the object
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