set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on force of gravity, solids and fluids topic of general science mcq
Gravitational attraction is a central force and therefore in motion of planets in the solar system, the angular momentum is conserved.
Reason (R)
In the motion of planets of the solar system, equal areas are swept in equal time.
(a) A is true but R is false
(b) Both A and R are true but R is not the correct explanation of A
(c) Both A and R are ture and R is the correct explanation of A
(d) A is false but R is true
The correct answers to the above question in:
Answer: (c)
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Question : 1
Assertion (A):
An iron ball floats on mercury but gets immersed in water.
Reason (R) :
The specific gravity of iron is more than that of mercury.
a) A is true but R is false
b) Both A and R are true but R is not a correct explanation of A
c) Both A and R are true and R is the correct explanation of A
d) A is false but R is true
Answer »Answer: (a)
Question : 2
A body is at rest on the surface of earth. Which of the following statements is correct?
a) Frictional force acts on the body.
b) Only upward force acts on the body.
c) Only weight of the body acts on it.
d) Net upward force is equal to the net downward force.
Answer »Answer: (d)
Question : 3
Assertion (A) :
A beaker filled with water at 4°C overflows if the temperature is decreased or increased.
Reason (R) :
Density of water is maximum at 4°C.
a) A is true but R is false
b) Both A and R are true but R is not a correct explanation of A
c) Both A and R are true and R is the correct explanation of A
d) A is false but R is true
Answer »Answer: (c)
Question : 4
A liquid rises to a certain length in a capillary tube. The tube is inclined to an angle of The length of the liquid column will
a) remain unchanged
b) decrease
c) increase
d) first decrease and then increase
Answer »Answer: (a)
Question : 5
Which one of the following statements regarding artificial satellite of the earth is incorrect?
a) The period of revolution is large if the radius of its orbit is large
b) A minimum velocity of 8 km/s is required by a satellite to orbit quite close to the earth
c) The orbital velocity depends on the mass of the satellite
d) The height of a geostationary satellite is about 36000 km from the earth.
Answer »Answer: (c)
Question : 6
A liquid is kept in a regular cylindrical vessel upto a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will
a) be increased to twice the earlier pressure
b) be reduced to half the earlier pressure
c) remain unaffected
d) be reduced to one-fourth the earlier pressure
Answer »Answer: (c)
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