Light year is the unit of measurement of
(A) the age of the universe
(B) very short time - lapse
(C) very high temperature
(D) very long distance
When the speed of a moving object is halved , its _______
(A) Kinetic energy becomes 1/4 of the initial
(B) The kinetic energy becomes 4 times of the initial .
(C) There is no change in kinetic energy .
(D) The acceleration is doubled .
Find the kinetic energy ( in joules ) of an object of mass 20 kg whose velocity is 4m / s ?
(A) 140
(B) 120
(C) 160
(D) 180
The resistance of a conductor is 440 ohms . How much current will flow if it is connected to a 110 volt source ?
(A) 0.2 A
(B) 0.25 A
(C) 4 A
(D) 1.25 A
Diode is a device that converts current
(A) allows it to flow in one direction
(B) allows it to flow in both directions
(C) does not allow it to flow in any direction
(D) none of the above
What is measured by manometer ?
(A) air pressure
(B) pressure of gases
(C) Density of liquids
(D) oil pressure at the surface
What is the change in the weight of iron when it rusts?
(A) gets reduced.
(B) rises up
(C) remains the same
(D) None of these
What is the value of acceleration due to gravity at the center of the earth?
(A) 0
(B) -1
(C) 1
(D) 9.8
On which law is the principle of working of power transformer based?
(A) Faraday's law
(B) Hooke's law
(C) Newton's law
(D) Einstein's theory
The emission of which of the following increases the atomic number of an element by one?
(A) alpha particle
(B) beta particle
(C) proton
(D) neutron
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