Top 50 General Science GK Questions
A wire loop is rotated in a magnetic field such that the frequency of change of direction of the induced emf is
(A) Six times per revolution
(B) Four times per revolution
(C) Twice per revolution
(D) Once per revolution
Correct Answer : C
What is the constant of proportionality of an oscillator if the damping force is directly proportional to the velocity
(A) Kg.s-1
(B) Kg.m.s-1
(C) Kg.s
(D) Kg.m.s-2
Correct Answer : A
Explanation :
The damping force of an oscillating particle is observed to be proportional to velocity. The constant of proportionality can be measured in. kgs−1.
What happens to the force acting between the charged particles, if the distance between these charged particles is halved?
(A) It increases by four times
(B) It gets doubled
(C) It becomes half
(D) It reduces by one-fourth
Correct Answer : A
Explanation :
So, when the distance between the two charges is halved, the force is increased four times.
The capacity of parallel plate condenser is dependent on the
(A) The separation between the plates
(B) The metal used for the construction
(C) The thickness of the plate
(D) The potential applied across the plates
Correct Answer : B
Explanation :
Therefore, the capacity of a parallel plate capacitor directly depends on the relative permittivity of dielectric material, the permittivity of space, the area of plates, and is inversely dependent on the separation between the plates.
What does an electric dipole experience when it is kept in the non-uniform electric field?
(A) Only a force
(B) Only torque
(C) Force and torque both
(D) Neither force nor torque
Correct Answer : C
Explanation :
An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.
The observer hears a sound from the source which is moving away from the observer who is stationary. Determine the frequency of the sound
(A) It is halved
(B) It remains the same
(C) It reaches infinity
(D) It gets doubled
Correct Answer : A
Explanation :
If the observer is moving away from the source ((Figure)), the observed frequency can be found: λs=vTo−voTovTs=(v−vo)Tov(1fs)=(v−vo)(1fo)fo=fs(v−vov).
What are the conditions for gas like Carbon monoxide to obey the ideal gas laws?
(A) Low temperature and low pressure
(B) Low temperature and high pressure
(C) High temperature and low pressure
(D) High temperature and high pressure
Correct Answer : C
Explanation :
A real gas can behave as an ideal gas if volume of molecule is negligible and interaction between molecule is negligible. This will happen if number of molecule per unit volume is very small. This is only possible at high temperature and low pressure.
The coefficient performance of a refrigerator is 5. If the temperature inside the freezer is -20℃, calculate the heat rejected to the surrounding
(A) 110C
(B)
410C
(C)
210C
(D)
310C
Correct Answer : A
Explanation :
A heat pump is a heat engine working in reverse direction. A refrigerator is basically a heat pump, which is used to pump heat (absorbed from materials at lower temperatures inside the refrigerator) to the surroundings at higher temperatures. The coefficient of performance of a refrigerator is defined as the ratio of heat removed
Why
2
Energy from inside the refrigerator per cycle
w
given per cycle for heat removal,
α
,
Why
2
,
w
,
Choose the correct statement
(A) A body can be accelerated by frictional force
(B) There can be zero friction
(C) Kinetic friction is greater than rolling friction
(D) Frictional force and area of contact between the two surfaces are proportional
Correct Answer : C
Find the molecular mass of a gas that takes three times more time to effuse as compared to He with the same volume
(A) 9 u
(B) 64 u
(C) 27 u
(D) 36 u
Correct Answer : B
Explanation :
Its molecular mass will be: 64u.
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Rajesh Bhatia
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