Get daily topic-wise Railway Quiz Questions and answers for various RRB exams like NTPC, JE, ALP, Group C and D. Free section-wise Indian railway quiz for RRB Exam.
Q1. Damp clothes are dried in spin dryers by the action of
(a) centripetal forces
(b) centrifugal forces
(c) central forces
(d) non-central forces
Q2. The atmospheric air is held to the earth by
(d) rotation of the Earth
Q3. The minimum number of geostationary satellites needed for uninterrupted global coverage is
Q4.If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with
(a) constant speed
(b) constant velocity
(c) constant acceleration
(d) varying acceleration
Q5. A particle dropped from the top of a tower uniformly falls on ground at a distance a which is equal to the height of tower. Which of the following paths will be traversed by the particle?
(c) Great circle
Q6. A sphere rolls down on two inclined planes of different angles but same height, it does so
(a) in the same time
(b) with the same speed
(c) in the same time with the same speed
(d) in the same time with the same kinetic energy
Q7. For which of the following substances, the resistance decreases with increase in temperature?
(a) Pure silicon
Q8. A transformer works on the principle of
(a) self induction
(b) mutual induction
Q9. In AC circuits, AC meters measure
(a) mean values
(b) rms values
(c) peak values
(d) mean square values
Q10. When the milk is churned vigorously, the cream from it separated out due to
(a) gravitational force
(b) frictional force
(c) centrifugal force
(d) centripetal force
Exp. Centrifugal force is an outward force apparent in a rotating reference frame. It does not exist when a system is described relative to an inertial frame of reference. Damp clothes are dried in spin dryers by the action of centrifugal forces.
Exp. The atmospheric air is held to the earth by the force of gravity which holds down the atmosphere. The atmospheric air molecules cannot escape the gravitational pull of the Earth as the escape velocity on the Earth’s surface is 11.2 km/s. At the moon’s surface the value of escape velocity is 2.38 km/s so there is no any atmosphere around the moon.
Exp. Minimum three geostationary satellites are needed for the uninterrupted global coverage.
Exp. If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with constant acceleration.
Exp. If a particle is dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower then a parabolic path will be traversed by a particle because when the particle is dropped that point is called the point of projection and when it reaches the ground that point is called the point of impact. Now, if the two points is met with one another the curve emerges is parabolic in nature. Hence, we can say that the path followed by the particle is of parabolic trajectories.
Exp. The velocity of the sphere at the bottom depends on height and acceleration due to gravity.Both these values are constant.Therefore the velocity at the bottom remains the same from whichever inclined plane the sphere is rolled
Exp. Pure silicon resistance decreases with increase in temperature.
Exp. A transformer consists of two electrically isolated coils and operates on Faraday’s principal of “mutual induction”, in which an EMF is induced in the transformers secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.
Exp. In AC circuits, AC meters measure rms values .
Exp. When the milk is churned vigorously the cream from it is separated out duel the effect of centrifugal force as when liquids of different specific gravities revolve around the same distance and with the same angular velocity, then a huge centrifugal force is exerted on the heavier than on the lighter one.
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