Science

Q.1. The most productive ecosystem in the biosphere is
A. Estuary
B. Desert
C. Open Ocean
D. Tundra
Ans. Estuary


Q.2. Which of the following is the cleanest source of energy?
A. Biofuel
B. Fossil fuel
C. Nuclear power
D. Wind energy
Ans. Wind energy


Q.3. If there were no gravity, which of the following will not be there for a fluid?
A. Viscosity
B. Surface tension
C. Pressure
D. Upward thrust
Ans. Upward thrust


Q.4. The commonly used coolant in refrigerators is
A. Ammonia
B. Nitrogen
C. Freon
D. Oxygen
Ans. Freon


Q.5. In an optical fibre the signal is transmitted
A. In a straight path
B. In a curved path
C. Due to total internal reflection
D. Due to refraction
Ans. Due to total internal refection


Q.6. Clove is obtained from
A. Root
B. Stem
C. Leaves
D. Flower buds
Ans. Flower buds


Q.7. Which of the following is a fish
A. Jelly fish
B. Lobster
C. Salmon
D. Whale
Ans. Salmon


Q.8. The constellation Sapta Rishi is known to westerns as the
A. Seven Monks
B. Alpha Centauri
C. Big Dipper
D. Small Bear
Ans. Big Dipper


Q.9. At which stage in its life cycle does silkworm yield the fibre of commercial use
A. Egg
B. Larva
C. Pupa
D. Imago
Ans. Pupa


Q.10. Bee sting contains
A. An acidic liquid
B. A salt solution
C. An alkaline liquid
D. A corrosive liquid
Ans. An acidic liquid

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