Quiz 410 – Practice Paper (Science)

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1. When the temperature is raised, the viscosity of a liquid decreases. This is because of

(a) Decrease convalent and hydrogen bond forces.

(b) Decreased volume of the solution.

(c) Increase in the temperature that increases the average kinetic energy of molecules which overcome the attractive force between them.

(d) Increased attraction between the molecules.


 

2. The metallurgical process in which a metal is obtained in a fused state is called

(a) Calcination

(b) Froth flotation

(c) Smelting

(d) Roasting


 

3. Which of the following statement(s) is/are true?

  1. Allergies are caused due to secretion of histamine in the body.
  2. Narcotic analgesics are also known as opiates.
  3. Oral contraceptives belong to the class of natural products called steroids.

(a) Only 1

(b) Both 1 and 2

(c) Both 2 and 3

(d) All of these.


 

4. The graphite rods in the nuclear reactor

(a) Convert fast moving neutrons into thermal neutrons

(b) Undergo combustion which triggers the nuclear fission

(c) React with U to release energy

(d) Produce neutrons


 

5. Which of the following are true statement(s)?

  1. Silica causes lung disease called white lung cancer.
  2. The lung disease caused by asbestos particulates is called asbestosis.
  3. Coal miners suffer from black lung disease.

(a) Only 1

(b) Both 1 and 2

(c) Both 2 and 3

(d) All of these.


 

6. A gas is liquefied

(a) Above critical temperature and pressure

(b) Above critical temperature and below critical pressure.

(c) Below critical temperature and above critical pressure.

(d) Below critical temperature and pressure.


 

7. The unused fat present in the body is

(a) Easily destroyed by certain enzymes present in the body.

(b) Convert into carbohydrates

(c) Removed as waste from the body

(d) Reconverted into animal fat and stored in different parts of the body


 

8. Lodized salt is a

(a) Mixture of molecular iodine and common salt

(b) Mixture of a potassium iodine and common salt

(c) Compound formed by combination of molecular iodine and common salt

(d) Compound formed by combination of potassium iodine and common salt


 

9. Most commonly used chemical for stain removal is

(a) Mineral water

(b) Salted water

(c) Javelle water

(d) Citric acid


 

10. Heavy water is manufactured

(a) By repeated electrolysis of 3% aqueous solution of NaOH

(b) By Combination of hydrogen and heavier isotope or oxygen

(c) By electrolysis of water containing heavy hydrogen dissolved in it

(d) None of these.


 

11. In an electrochemical cell, the electrons flow from

(a) solution to cathode.

(b) anode to solution.

(c) anode to cathode.

(d) cathode to anode.


 

12. Consider these statements:

  1. The asteroid belt is between the orbits of Mars and Jupiter.
  2. Stellar energy is the internal energy of a star.
  3. Mercury, Venus, Earth and Mars are made up mostly of iron and rock. They are known as terrestrial or earth-like planets because of their similar size and composition.

Select the correct statement(s) from the codes given below:

(a) Only 1

(b) Both 1 and 3

(c) Both 2 and 3

(d) All of these


 

13. Consider these statements:

  1. It has two moons called Phobos and Damos
  2. It is one of the inner planets of the solar system
  3. This planet changed colour in different season
  4. No life has been detected on it

These statements are about

(a) Venus

(b) Jupiter

(c) Neptune

(d) Mars


 

14. When milk is churned, the cream from it gets separated due to

(a) Heat

(b) Frictional force

(c) Gravitational force

(d) Centrifugal force


 

15. By placing ear on the rail tracks it is possible to detect the approach of train because

(a) Sound produced by train travel faster in solid than in air

(b) Trains produces vibration

(c) Both (a) and (b)

(d) None of these


 

Answers:

  1. (c) With increase in temperature, viscosity of liquid decreases as the average kinetic energy of the molecules increases.
  2. (c)
  3. (d)
  4. (a) Thermal neutrons are slow neutrons that are approximately in thermal equilibrium with a moderator. They have a distribution of speed similar to that of the molecules of a gas at the temperature of the moderator.
  5. (c) Silica causes silicosis.
  6. (c) A gas is liquefied only if the temperature. The minimum pressure required to liquefy the gas at the critical temperature is called the critical pressure.
  7. (d) Reserved fat acts as thermoinsulator
  8. (b)
  9. (c) Javelle water also Javel water is an aqueous solution of potassium or sodium hypochlorite, used as a disinfectant and bleaching agent.
  10. (a)
  11. (d) The electrons liberated at anode during oxidation move toward cathode where they are used up.
  12. (d)
  13. (d)
  14. (d) An object traveling in a circle behaves as if it is experiencing an outward force. This force is known as the centrifugal force. The force of spin cause the cream to get separated from the milk.
  15. (c)

Also Read:

Quiz 408 – Practice Paper (Indian Polity)

Quiz 406 – Practice Paper (Medieval History)

Quiz 405 – Practice Paper (Ancient India)

Quiz 403 – Practice Paper (Indian Polity)

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