Question Paper NDA
1. The earth’s magnetic field is approximately
A. 1 Tesla
B. 2 Gauss
C. 104 Tesla
D. 1 Gauss
Ans. (D)
2. Yellow colour light is used as fog light because yellow colour
A. light is most scattered by fog
B. has the longest wavelength among all colours
C. has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarly with red
D. has the shortest wavelength among all colours not already reserved for other purpose
Ans. (C)
3. A hot object losses heat to its surroundings in the form of heat reduction. The rate of loss of heat depends on the
A. temperature of the object
B. temperature of the surroundings
C. temperature differences between the objects and its surroundings
D. average temperature of the objects and its surroundings
Ans. (C)
4. The mirror used for the head light of a car is
A. spherical concave
B. plane
C. cylindrical
D. parabolic concave
Ans. (D)
5. An iron ball and a wooden ball of the same radius are released from a height ‘H’ in vacuum. The time taken to reach the ground will be
A. more for the iron ball
B. more for the wooden ball
C. equal for both
D. in the ratio of their weights
Ans. (C)
6. Three elements Na, S and O combine to form a compound Na2SO3. What is the valences of S in this compound?
A. 2+
B. 4+
C. 6+
D. 8+
Ans. (B)
7. Which one among the following is the equivalent weight of sulphuric acid?(Atomic weight: H=1, S=32, O=16)
A. 98
B. 60
C. 100
D. 49
Ans. (D)
8. Deionised water is produced by
A. Calogen process
B. Ion-exchange resin process
C. Clark’s process
D. Permutit process
Ans. (A)
9. Which one of the following is a double salt?
A. K4[Fe(CN)6]
B. K2SO4.Al2(SO4)3.24H2O
C. CuSO4.5H2O
D. NaCl
Ans. (B)
10. Which one among the following is the correct order the strength of acids?
A. H2SO4 > H3PO3 > CH3COOH
B. H2PO3 > H2SO4 > CH3COOH
C. CH3COOH > H3PO3 > H2SO4
D. CH3COOH > H2SO4 > H3PO3
Ans. (A)
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