76.  Bats can fly in the dark, because -

a

  They have better vision in the dark

b

 The pupils of their eyes are very big

c

 They are guided by ultrasonic waves produced by them

d

 None of the above

Answer & Explanation
Answer : Option C

77.  Hydrometer is an instrument

a

  To detect the presence of hydrogen in the atmosphere

b

 For measuring the specific gravity of liquids

c

 To detect the changes in atmospheric humidity

d

 None of the above

Answer & Explanation
Answer : Option B

78.  The number of ribs in a human body is

a

  22

b

 24

c

 21

d

 23

Answer & Explanation
Answer : Option B

79.  What is the life span of RBC?

a

  120 days

b

 100 days

c

 130 days

d

 110 days

Answer & Explanation
Answer : Option A

80.  Tetraethyl lead is used as

a

  mosquito repellent

b

 pain killer

c

 fire extinguisher

d

 petrol additive

Answer & Explanation
Answer : Option D

81.  How many colours the sunlight spectrum has?

a

  Three

b

 Seven

c

 Four

d

 Five

Answer & Explanation
Answer : Option A

82.  The property of a substance to absorb moisture from the air on exposure is called

a

  Desiccation

b

 Deliquescene

c

 Osmosis

d

 Efflorescence

Answer & Explanation
Answer : Option B

83.  Lactometer is used to determine

a

  Purity of water

b

 Purity of milk

c

 Purity of food

d

 Purity of fruit

Answer & Explanation
Answer : Option C

84.  Wood is the primary raw material for the manufacture of:

a

  paper

b

 gun powder

c

 paint

d

 ink

Answer & Explanation
Answer : Option A

85.  Light year is a measurement of

a

  speed of aeroplanes

b

 speed of light

c

 Stellar distances

d

 speed of rockets

Answer & Explanation
Answer : Option C

86.  In which type of rocks are metals like Gold and Copper mostly found?

a

  Old sedimentary

b

 Old igneous

c

 New metamorphic

d

 Old metamorphic

Answer & Explanation
Answer : Option B

87.  Diamond is an allotropic form of

a

  silicon

b

 germanium

c

 carbon

d

 sulphur

Answer & Explanation
Answer : Option C

88.  Bacteria was discovered first by

a

  Leeuwenhook

b

 Robert hook

c

 Louis pasteur

d

 Robert Koch

Answer & Explanation
Answer : Option A

89.  Which of the following is in liquid form at room temperature?

a

  Sodium

b

 Lithium

c

 Francium

d

 Cerium

Answer & Explanation
Answer : Option C

90.  From which of the following endocrine glands is GTH secreted?

a

  Adrenal gland

b

 Pituitary gland

c

 Thyroid gland

d

 Islets of Langerhans in pancreas

Answer & Explanation
Answer : Option B

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