Science and Environment Quiz: Day 50

December 26, 2022

Pressure exerted by a liquid is increased by

(A) The density of the liquid
(B) The height of the liquid column
(C) Both a and b
(D) None of the above

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Answer : c

The pressure in a liquid depends on three things:

(a) the depth within the liquid (measured vertically from its surface)

(b) the density of the liquid (assumed uniform)

Consider the following statement :
1. Force acting on a given area is called pressure.
2. A moving body comes to rest due to friction alone.
3. A body will sink if the weight of the body is greater than the buoyant force
Which of the statement is/are incorrect:

(A) Only 1
(B) Only 2 and 3
(C) Only 3
(D) None of the above

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Answer : D

An upward force is exerted by water on a floating or a partly submerged body. This upward force is called buoyant force. This phenomenon is known as buoyancy. This force is not only exerted by liquids, but also by gases.
This upward force decides whether an object will sink or float. If the weight of the
object is less than the upward force, then the object will float. If not, it will sink.

Consider the following statement regarding Saturn:
1. Viscosity depends on the pressure of a liquid.
2. Rolling friction is slightly greater than the sliding friction.
3. Surface tension Force which contracts the surface area of the liquids
Which of the statement is/are correct:

(A) Only 1
(B) Only 2 and 3
(C) Only 1 and 3
(D) All of the these

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Answer : C

Pascal’s law is used in

(A) Hydraulic lift
(B) Brake system
(C) Pressing heavy bundles
(D) All the above

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Answer : D

The applications of Pascal’s law are:

In automobile service stations, the vehicles are lifted upward using the hydraulic lift which works as per Pascal’s law.
Automobile brake system works according to Pascal’s law.
The hydraulic press is used to compress the bundles of cotton or cloth so as to occupy less space

The centrifugal force is

(A) A real force.
(B) The force of reaction of centripetal force.
(C) Avirtual force.
(D) Directed towards the centre of the circular path.

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Answer : C

Centrifugal force Force, arising from the body’s inertia, which appears to act on a body moving in a circular path and is directed away from the centre.

Consider the following statement regarding Saturn:
1. The motion of a city bus in a heavy traffic road is an example for uniform motion.
2. Acceleration can get negative value also.
3. Distance covered by a particle never becomes zero but displacement becomes zero.
Which of the statement is/are correct:

(A) Only 1
(B) Only 2 and 3
(C) Only 1 and 3
(D) All of the these

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Answer : B

Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction or both of them.
Reason: Acceleration can be produced only by change in magnitude of the velocity. It does not depend the direction.

(A) If both assertion and reason are true and reason is the correct explanation of assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If assertion is false but reason is true.

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Answer : C

Inertia of a body depends on

(A) Weight of the object
(B) Acceleration due to gravity of the planet
(C) Mass of the object
(D) Both a & b

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Answer : C

If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

(A) Decrease by 50%
(B) Increase by 50%
(C) Decrease by 25%
(D) Increase by 300%

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Answer : D

The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg

(A) 4 M
(B) 2M
(C) M/4
(D) M

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Answer : D

With reference to the food chains in ecosystems, which of the following kinds of organism is/are known as decomposer organism/organisms?
1. Virus
2. Fungi
3. Bacteria
Select the correct answer using the codes given below.

(A) 1 only
(B) 2 and 3 only
(C) 1 and 3 only
(D) 1, 2 and 3

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Answer : B

Consider the following statements:
1. Land clearing and human habitation put significant pressure on local species.
2. Disturbed habitats are prone to invasions.
3. Invasive species can change the functions of ecosystems.
Which of these statements are correct?

(A) 1 and 2
(B) 1, 2 and 3
(C) 1 and 3
(D) 1 only

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Answer : B

Which of the following are threats to biodiversity?
1. Interbreeding of wild varieties
2. Pesticides
3. Hydro-power projects

(A) 3 only
(B) 2 and 3 only
(C) 1, 2 and 3 only
(D) None of these

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Answer :B

Botanic Garden of India Republic is located at

(A) Noida
(B) Kolkata
(C) Pune
(D) Nilgiri

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Answer : B

Consider the following statements:
1. Productivity is normally greater in the lower latitudes as compared to the higher latitudes.
2. Along the mountain gradients, biodiversity is normally greater in the higher altitudes as compared to the lower altitudes.
Which of the statements given above is/are correct?

(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2

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Answer : A