Q. A solar cell converts solar energy into which energy?
1) Sound energy
2) Mechanical energy
3) Chemical energy
4) Electrical energy
Q. A light year is a unit of which physical quantity?
1) Mass
2) Distance
3) Speed
4) Temperature
Q. Which of the following is not matched correctly?
Invention Inventor
1) Proton - E. Rutherford
2) Neutron - Chadwick
3) Photon - H. Yukawa
4) Electron - J. J. Thomson
Q. The speed of sound waves is maximum in -
1) liquids
2) gases
3) solids
4) All of these
Q. Almost 98% of Earth's crust is eight elements, the following does among made up of Which of the NOT figure elements?
1) Carbon
2) Silicon
3) Calcium
4) Oxygen
Q. What is represented by the product of force with displacement in the direction of force?
1) Work
2) Momentum
3) Impulse
4) Power
Q. When light passes from one medium into another, it suffers a change in -
1) Frequency, wavelength, and speed
2) Frequency and speed
3) Wavelength and speed
4) None of the above
Q. Which is the smallest possible unit of a chemical compound?
1) Atom
2) Molecule
3) Proton
4) Photon
Q. Combustion of the candle is a/an -
1) Exothermic reaction
2) Photochemical reaction
3) Physical change
4) Endothermic reaction
Q. Light energy is converted into chemical energy by -
1) Electrolysis
2) Respiration
3) Transpiration
4) Photosynthesis
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