76.  The number of waves in n × 10th Bohr's orbit are

a

  n3

b

 n2

c

 n-2

d

 n

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Answer & Explanation
Answer : Option D
Explanation :

77.  The metal that is usually extracted from sea water is

a

  Na

b

 Ca

c

 Mg

d

 K

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Answer & Explanation
Answer : Option C
Explanation :

78.  Which of the following electrical machines has the highest efficiency?

a

  Induction motor

b

 D.C shunt motor

c

 Transformer

d

 Synchronous motor

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Answer & Explanation
Answer : Option C
Explanation :

79.  Isotopes of an element contain

a

  Equal number of protons and electrons

b

 Equal number of nucleons

c

 The same number of neutrons but different number of protons

d

 The same number of protons but different number of neutrons

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Answer & Explanation
Answer : Option D
Explanation :

80.  Exposure to sunlight helps a person improve his health because

a

  The infrared light kills bacteria in the body

b

 The pigment cells in the skin get stimulated and produce a healthy tan

c

 The ultraviolet rays convert skin oil into Vitamin D

d

 Resistance power increases

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Answer & Explanation
Answer : Option C
Explanation :

81.  In which decade was the Internet first implemented?

a

  1980s

b

 1950s

c

 1960s

d

 1940s

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Answer & Explanation
Answer : Option C
Explanation :

82.  Sound of frequency below 20 Hz is called

a

  Audio sounds

b

 Infrasonic

c

 Supersonics

d

 Ultrasonic

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Answer & Explanation
Answer : Option B
Explanation :

83.  Primary rainbow is formed when light suffers

a

  Either one or two internal refractions before emerging out of the drop

b

 No internal refraction

c

 One internal refractions before emerging out of the drop

d

 Two internal refractions before emerging out of the drop

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Answer & Explanation
Answer : Option C
Explanation :

84.  Air is a/an

a

  Element

b

 Compound

c

 Mixture

d

 Electrolyte

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Answer & Explanation
Answer : Option C
Explanation :

85.  What African-American inventor received 5 patents in the field of shoemaking?

a

  Lewis Latimer

b

 Jan Ernst Matzeliger

c

 Elijah McCoy

d

 Ernest Just

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Answer & Explanation
Answer : Option B
Explanation :

86.  Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes

a

  Tetanus

b

 Typhoid

c

 Cholera

d

 Influenza

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Answer & Explanation
Answer : Option C
Explanation :

87.  The blood pressure of a young male human being is

a

  140/100

b

 110/70

c

 120/80

d

 135/90

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Answer & Explanation
Answer : Option C
Explanation :

88.  In which decade was the SPICE simulator introduced?

a

  1980s

b

 1960s

c

 1950s

d

 1970s

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Answer & Explanation
Answer : Option D
Explanation :

89.  Electric current is measure by

a

  Anemometer

b

 Ammeter

c

 Commutator

d

 Voltmeter

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Answer & Explanation
Answer : Option B
Explanation :

90.  Filaria is caused by

a

  Virus

b

 Protozoa

c

 Mosquito

d

 Bacteria

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Answer & Explanation
Answer : Option C
Explanation :


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