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1. Nearly what proportion of the total amount of Sun's energy coming to the Earth is directly reflected back into space by its top atmosphere?

(A) One-tenth

(B) One-fifth

(C) One-fourth

(D) One-third

2. In which form is the largest amount of energy received by the Earth from the Sun?

(A) X-ray

(B) Gamma rays

(C) Infra-red energy

(D) None of the above

3. Small drops of a liquid are spherical in shape because?

(A) the surface energy is maximum for the spherical shape

(B) for a given volume; the surface area of a sphere is maximum

(C) the surface energy is minimum for the spherical shape

(D) the earth attracts all the particles of the drop equally

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4. A photo-electric cell converts?

(A) sound energy into electrical energy

(B) light energy into electrical energy

(C) an electrical signal into sound waves

(D) electrical energy into light energy

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5. Pressure cooker cooks rice faster because?

(A) it always lets the steam escape

(B) high pressure crushes the hard covering of rice grains

(C) it does not let the heat energy escape easily

(D) high pressure raises the boiling point of water

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6. Which of the following statements relating to sound and light is true?

(A) Light IS a form of kinetic energy; whereas sound is a form of potential energy

(B) Light can be reflected but sound cannot be

(C) Light travels faster in air than does sound

(D) Sound travels in waves but light does not

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7. During a journey from earth to moon and back, the greatest energy required from the spaceship's rocket is to overcome?

(A) the moon's gravity at lunar landing

(B) the earth's gravity at take-off

(C) the moon's gravity at take-off

(D) the earth's gravity at re-entry into the atmosphere

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8. Energy is directly or indirectly received from?

(A) Moon

(B) Sun

(C) Stars

(D) Water

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9. Who among the following evolved the concept of relationship between mass and energy?

(A) Einstein

(B) Planck

(C) Dalton

(D) Rutherford

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10. What is Radiology?

(A) It deals with study of fossils

(B) It deals with origin and growth of plant

(C) It deals with study of earthquakes

(D) It deals with radiant energy

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1. Nearly what proportion of the total amount of Sun's energy coming to the Earth is directly reflected back into space by its top atmosphere?

2. In which form is the largest amount of energy received by the Earth from the Sun?

3. Small drops of a liquid are spherical in shape because?

4. A photo-electric cell converts?

5. Pressure cooker cooks rice faster because?

6. Which of the following statements relating to sound and light is true?

7. During a journey from earth to moon and back, the greatest energy required from the spaceship's rocket is to overcome?

8. Energy is directly or indirectly received from?

9. Who among the following evolved the concept of relationship between mass and energy?

10. What is Radiology?

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