NDA MOCKTEST 2019 (2) 76-100

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1. Which one of the following is termed as 'Dry ice'?

1 point

(a) Ice present in ice-cream

(b) Solid water at Antarctica

(d) Solid water of ionosphere

Clear selection

2. Net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called

1 point

(a) Diffusion

(b) Dispersion

(d) Absorption

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3. Blood is a type of

1 point

(a) Epithelial tissue

(b) Muscular tissue

(d) Connective tissue

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4. Mitochondria are able to produce their own

1 point

(a) Nucleus

(b) Proteins

(d) Digestive enzymes

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5. Which one of the following statements is correct?

1 point

(a) Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres.

(b) Flexibility in plants is due to sclerenchyma.

(d) Xylem consists of sieve plate, sieve tube and companion cells.

Clear selection

6. Who among the following popularized the use of embryological characters in taxonomy?

1 point

(a) Carl Linnaeus

(b) Panchanan Maheshwari

(d) Bentham and Hooker

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7. Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on 1. Supply voltage.2. Current passing through the coil. 3. Time for which voltage is supplied. Select the correct answer from among the following:

1 point

(a) 1, 2 and 3

(b) 1 and 2 only

(d) 2 and 3 only

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8. A pendulum clock is lifted to a height where the gravitational acceleration has a certain value g. Another pendulum clock of same length but of double the mass of the bob is lifted to another height where the gravitational acceleration is g/2. The time period of the second pendulum would be : (in terms of period T of the first pendulum)

1 point

(a) √2T

(b) 1/√ 2T

(d) T

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9. The loudness of sound depends upon the

1 point

(a) velocity of sound waves in the medium.

(b) amplitude of the sound waves.

(d) frequency and velocity of the sound waves.

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10. Two bodies of mass M each are placed R distance apart. In another system, two bodies of mass 2M each are placed distance apart. If F be the gravitational force between the bodies in the first system, then the gravitational force between the bodies in the second system will be

1 point

(a) 16 F

(b) if

(d) None of the above

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11. Light rays move in straight lines. But through an optical fibre, they can move in any type of zigzag path because

1 point

(a) the holes through the fibre are extremely fine.

(b) light rays are absorbed at the entry end and relieved at the exit end of the fibre.

(d) successive total internal reflections occur as a ray moves through the fibre

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12. Which one of the following statements regarding cathode rays is not correct?

1 point

(a) Cathode ray particles are electrons.

(b) Cathode ray particles start from anode and move towards cathode.

(d) Television picture tubes are cathode ray tubes

Clear selection

13. A very large volume of hydrogen can be accommodated by making

1 point

(a) non-metallic hydrides.

(b) hydrogen peroxide.

(d) alkali metal hydrides.

Clear selection

14. Which one of the following is not a monatomic element ?

1 point

(a) Copper

(b) Helium

(d)Barium

Clear selection

15. Which one of the following represents the correct order of electron releasing tendency of metals?

1 point

(a) Zn > Cu > Ag

(b) Ag > Cu > Zn

(d) Cu > Ag > Zn

Clear selection

16.Which one of the following is the major constituent of biogas ?

1 point

(a) Carbon dioxide

(b) Nitrous oxide

(d) Oxygen

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17. Thyroid gland produces a hormone called "Thyroxine" which

1 point

(a) controls blood glucose levels.

(b) controls ovulation.

(d) maintains pregnancy.

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18. Which one of the following is a bacterium that causes disease in the human body?

1 point

(a) Varicella zoster

(b) Trypanosoma gambiense

(c)Salmonella typhi

(d) Plasmodium falciparum

Clear selection

19. Which one of the following statements regarding viruses is not true?

1 point

(a) Viruses need living cells to reproduce.

(b) All viruses are parasites.

(d) Viruses are similar to chemical substances outside the host.

Clear selection

20. Which one of the following diseases may be caused by the deficiency of vitamin C ?

1 point

(a) Rickets

(b) Rabies

(d) Scurvy

Clear selection

21. Compared to audible sound waves, ultrasound waves have

1 point

(a) higher speed.

(b) higher frequency.

(d) both higher speed and frequency.

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22. A rigid body of mass 2 kg is dropped from a stationary balloon kept at a height of 50 m from the ground. The speed of the body when it just touches the ground and the total energy when it is dropped from the balloon are respectively (acceleration due to gravity = 9.8 m/s)

1 point

(a) 980 m.s-1 and 980 J

(b) 1980 m.s-1 and 1980 J

(d) 1980 m.s-1 and 980 J

Clear selection

23. The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be

1 point

(a) 318 K

(b) 45K

(d) 335.8 K

Clear selection

24. Radiations coming from the Sun are mostly in the form of

1 point

(a) light only.

(b) light and long wavelength infrared.

(d) both short and long wavelength infrared.

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25. Which of the following are the characteristics of electromagnetic waves ? 1. They are elastic waves. 2. They can also move in vacuum.3. They have electric and magnetic components which are mutually perpendicular. 4.They move with a speed equal to 3 lakh meters per second. Select the correct answer using the code given below :

1 point

(a) 1, 2, 3 and 4

(b) 1, 2 and 4 only

(d) 3 and 4 only

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