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gk (general knowledge) questions and answers MCQ

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gk (general knowledge) questions and answers MCQ for for all competitive exams UPSC IAS IPS Prelims, SSC CGL ,SSC CHSL general Awareness CTET, UGC NET

Gk Questions and answers

 

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

a
Na
b
Ca
c
Mg
d
K
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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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Discuss
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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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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81.
In which decade was the Internet first implemented?

a
1980s
b
1950s
c
1960s
d
1940s
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82.
Sound of frequency below 20 Hz is called

a
Audio sounds
b
Infrasonic
c
Supersonics
d
Ultrasonic
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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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84.
Air is a/an

a
Element
b
Compound
c
Mixture
d
Electrolyte
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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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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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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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88.
In which decade was the SPICE simulator introduced?

a
1980s
b
1960s
c
1950s
d
1970s
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89.
Electric current is measure by

a
Anemometer
b
Ammeter
c
Commutator
d
Voltmeter
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90.
Filaria is caused by

a
Virus
b
Protozoa
c
Mosquito
d
Bacteria
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