Top 50 General Science GK Questions
Bernoulli's theorem is based on?
(A) on energy conservation
(B) on conservation of momentum
(C) on conservation of charge
(D) none of these
Correct Answer : A
Explanation :
Bernoulli's principle is based on the law of conservation of energy. We equate total energy (pressure energy, potential energy and kinetic energy) of a flowing liquid at different points flowing under constant pressure difference.
What is the normal temperature of the human body?
(A) 65 degrees
(B) 95 degree
(C) 98.6°F
(D) 99 degrees
Correct Answer : C
Explanation :
Normal body temperature is considered to be 37°C (98.6°F); however, a wide variation is seen. Among normal individuals, mean daily temperature can differ by 0.5°C (0.9°F), and daily variations can be as much as 0.25 to 0.5°C.
If the electrical resistance is to be reduced, then the number of resistors should be connected with
(A) Mala (Series)
(B) Parallel
(C) Mixed system
(D) None of These
Correct Answer : C
Explanation :
When resistors are connected in parallel, more current flows from the source than would flow for any of them individually, so the total resistance is lower.
What happens to the temperature of water when it falls from a height?
(A) decreases
(B) increases
(C) neither decreases nor increases
(D) none of these
Correct Answer : B
Explanation :
The temperature of water increases when it falls from a height because when a water drop reaches the ground surface from a height, its potential energy increases.
Which of the following is not a unit of heat?
(A) Calorie
(B) Phon
(C) Joule
(D) Kcal
Correct Answer : B
Explanation :
The correct answer is Phon. Phon is not a unit of Heat.
What are the changes in the molecules of an object when it is heated?
(A) the speed will increase
(B) weight will decrease
(C) the load will increase
(D) energy will decrease
Correct Answer : A
Explanation :
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
The unit of which of the following is not newton-metre?
(A) Force
(B) Energy
(C) Work
(D) kinetic Energy
Correct Answer : A
An ice cube is floating in a glass of water, when the ice melts, what will be the effect on the water level?
(A) will increase will decrease
(B) first increase then decrease
(C) will remain the same
(D) none of these
Correct Answer : C
Explanation :
When a floating piece of ice melts into water, it contracts by the volume equal to the volume of ice pieces above the water surface while floating on it. Hence, the level of water does not change when ice floating on it melts.
An iron needle sinks in water but a ship floats, on what principle is this based?
(A) Pascal's principle
(B) Principle of Archimedes
(C) Law of Gravitation
(D) None of these
Correct Answer : B
Explanation :
Hence, according to Archimedes' principle, the upthrust is more than the weight of the ship. That is why the iron ship floats in water.
The apparent weight of a person in a lift is less than the actual weight when the lift is moving?
(A) up with acceleration
(B) down at the same speed
(C) up with uniform speed
(D) down with acceleration
Correct Answer : D
Explanation :
The apparent weight of a body in an elevator moving with downward acceleration is given by N = m ( g – a ) . Thus, the apparent weight of the body is less than the actual weight of the body.
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Rajesh Bhatia
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