Q:9 Which one of the following types of waves is used in a night vision apparatus?
(A) Radio waves
(B) Microwaves
(C) Infra-red waves
(D) None of the above
Q:10 The blue color of the clear sky is due to
(A) Diffraction of light
(B) Dispersion of light
(C) Reflection of light
(D) Refraction of light
Q:11 As you go down into a well, your weight
(A) increases slightly
(B) decreases slightly
(C) remains exactly the same
(D) None of the above
Q:12 The weight of an object will be minimum when it is placed at?
(A) The North Pole
(B) The South Pole
(C) The Equator
(D) The center of the Earth
Q:13 In fireworks, the green flame is produced because of
(A) Sodium
(B) Potassium
(C) Barium
(D) Mercury
Q:14 Which of the following is used in pencils?
(A) Silicon
(B) Phosphorous
(C) Graphite
(D) Charcoal
Q:15 What does airbag, used for the safety of car driver, contain?
(A) Sodium bicarbonate
(B) Sodium azide
(C) Sodium nitrite
(D) Sodium peroxide
Q:16 A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is
(A) O positive
(B) A positive
(C) B positive
(D) Cannot be determined on the basis of the given data
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