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1. The bark of cinchona is used as medicine in the treatment of malaria. Which one of the following artificial medicine is the substitute of cinchona?

a) Chloromycetin          b) Chloroquinine           c) Tetracycline            d) Ampicillin

Ans : B


2.Which of the following crop enrich the soil with nitrogen.

 a) Potato                       b) Sorghum                     c) Sunflower                 d) Pea

Ans : D


3.  Which one of the following is an example of subsistence farming?

a)  Organic farming                                              b) Commercial farming

c) intensive farming and Extensive  farming        d) Shifting cultivation

Ans : A


4. The difference between a nuclear reactor and atomic bomb is that –

a)  while in the atomic bomb there is a chain reaction No chain reaction takes place in the nuclear reactor

b) The chain reaction  is controlled in the nuclear reactor     

c) The chain reaction  is not controlled in the nuclear reactor

d)  while it takes place in nuclear reactor No  chain reaction takes place in the atomic bomb

Ans      B


5. Cobalt -60 is commonly used in radiation therapy because it emits –

a) ά – rays                     b) beta – rays                c) gamma rays              d) x – rays

Ans      C


6. The constituent particle of a nucleus in an atom is –

a) Electron and Proton                           b) Proton and Neutron  

c) Electron and Neutron                         d) Electron, Proton and Neutron

Ans      B


7. Rainbows are produced when sunlight.

a) The incident on raindrops hanging in the atmosphere is dispersed after suffering refraction and internal reflection

b) None of the given statements is correct

c) The incident on raindrops hanging in the atmosphere is dispersed after suffering reflection

d) The incident on raindrops hanging in the atmosphere is dispersed after suffering refraction

Ans      A

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