Science and math question asked in Bihar police exam 2020
All question is collected by memory the examinee who has given the exam last Sunday (12 January 2020)
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1.
Who was first European said that earth revolve around the sun
Answer- Copernicus
2.
Aids is caused by
Answer- virus
3.
The science of culture of flower is called?
Answer- Floriculture
4.
Binomial system of nomenclature is proposed by?
Answer – Carl Linnaeus
5.
What will approximate change in volume of cube if side x meter is increased by
3%.
Answer – 0.09 x3 m3
6
. Which of the following is not autotrophic?
Option- a)
Green plant b)blue green alga c) decomposer d) photosynthetic bacteria
Answer- decomposer
7
. If cost of 20 pens is selling price of 25 pens what is the net loss percent?
Answer – 20%
8
. Blue colour of sky is due to?
Answer- scattering of light
9.
Cell wall is absent in
Option - A)
Plant b) animal c) bacteria
d) fungus
Answer- animal
10.
Which of the following is the bad conductor of electricity?
Option- a)
Aluminum b) copper c) plastic d) silver
Answer- plastic
11.
The speed of boat is still water is 22km/h and speed of water current is 4 km/h
find the distance cover by boat upstream in 15 minutes
Answer- 4.5 km
12.
what is molecular mass of Heavey water?
Answer- 20
13.
if the velocity of the body is doubled, the what happens on kinetic energy
Answer- 4 times
14-
Burning of candle is example of
Answer- both physical and chemical change
15.
Blue green alga is example of
Answer- Autotrophic
16.
Which of the following is not mammals?
option- a)
Tiger b) whale c)bat
d)lizard
Answer- lizard
17.
Tap A and B can fill the tank in 6 hour and 9 hour respectively and Tap C can
empty the tank in 12 hour find the time in which tank became full?
Answer- 36/7
18.
What is the unit place on (4367)245
Answer- 7
19.
which of the following is highly responsible for global warming of earth
option- a)
Carbon dioxide b)sulpher dioxide c) methane d)cloro-floro-carbon
Answer- Carbon dioxide
20.
which vitamin is necessary for blood clotting ?
Answer- Vitamin k
21.
Which of the following having same SI unit?
option- a)
Force and energy b)Force and
acceleration c) speed and velocity d) velocity and distance
Answer-
22.
what would be printed price if the shopkeeper buy the article on 380 so, that
after giving discount of 5% he earns profit of 25%?
Answer- 500
23.
The slope of graph of velocity-time graph in uniform motion is?
Answer- 0
24.
In human sound is produced by
Answer- larynx
or voice box
25. If the mass of
moving body is halved and velocity became double then what will change in
kinetic energy?
Answer- double
26. Accumulation of
which of the following acid caused fatigue of muscles?
Answer- lactic acid
27. Proton is discovered by?
Answer- Rutherford
28. Audible range of
listening
Answer- 20Hz to 20000Hz
29. Marked price of
book is 800. After two successive discount, it is sold for rupess 612. If the
first discount is 10% then find the second discount.
Answer- 15%
30. A dishonest
shopkeeper sold the article at cost price, but he used to weight 900g for
1kg.His gain percent is.
Answer- 100/9
31. Name the
scientific name of honeybee culture is?
Answer- Apiculture
32. If a person cover
certain journey by car. If he covers 30% of distance by 20km/h. 60% of distance
by 40km/h and reaming at 10km/h find the average speed of the car.
Answer- 25km/h
33. Bowman's capsule
is component of which system
Answer- excretory system
34. For real Image we
will use which mirror
Answer- concave mirror
35. A and B can
complete the work in 2 day. A is double efficient then B. In how many days B
will complete the work.
Answer- 6 days
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