SSC -Science 1 September 2016" Set 1

1.DOTS is a treatment given to patients suffering from _________ .

1) Polio
2) AIDS
3) Hepatitis
4) Tuberculosis

2. Molten rock below the surface of the earth is called __________ .

1) Basalt
2) Laccolith
3) Lava
4) Magma

3.Magnesium is a constituent metal of __________ .

1) Chlorophyll molecule
2) DNA
3) Mitochondria
4) Ribosomes

4. Which one among the following components is used as an amplifying device?

1) Transformer
2) Diode
3) Capacitor
4) Transistor

5. Name the gas used in preparation of bleaching powder

1) Oxygen
2) Hydrogen
3) Nitrogen
4) Chlorine

6. The depletion in Ozone layer is caused by ___________ .

Options:

1) Nitrous oxide
2) Carbon dioxide
3) Chlorofluorocarbons
4) Methane

7. Phosphorus is kept in water because

1) its ignition temperature is very high
2) its ignition temperature is very low
3) its critical temperature is high
4) its critical temperature is low

8. The unit of measurement of noise is

Options:

1) Decibel
2) Hertz
3) Amplifier
4) Acoustics

9. The commonly used coolant in refrigerators is

1) Ammonia
2) Nitrogen
3) Freon
4) Oxygen

10. The complete form of 'IC' in electronics is

1) Internal circuit
2) Independent circuit
3) Integrated circuit
4) Inbuilt circuit

11. Sea water is saltier than rain water because

1) Sea animals are salt producing
2) The air around the sea is saltish
3) Rivers wash away salts from earth and pour them into the sea
4) Sea beds have salt producing mines

12. Polyploidy arises due to change in the

Options:

1) number of chromatids
2) structure of genes
3) number of chromosomes
4) structure of chromosomes