ECAT Pre Engineering Physics Chapter 19 online mcq test with answers for chapter 19 (Dawn of Modern Physics)

Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics Physics Online Test

Sr. #	Questions	Answers Choice
1	If a material object moves with the speed of light 'C' its mass becomes	Equal to its rest mass Four times of its rest mass Double of its rest mass Infinite
2	Which one of the following physical quantities changes with relativistic speed	Length Mass Time All of the above
3	According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body	Remains constant Decreases Increases to infinity Reduced to zero
4	A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is	1.66 m 1.0 m 0.66 m 2.66 m
5	If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers	larger shorter equal none of these
6	According to Einstein, with the great increase in the speed of the body the relativistic length of the body	Remains constant Decreases Increases Reduces to zero
7	The length contraction happens only	Opposite to the direction of motion along the direction of motion perpendicular to the direction of motion In any direction
8	The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum	2.9 s 3.0 s 6.6 s 9.6 s
9	According to the special theory of relativity, time is	absolute quantity not absolute quantity constant quantity none of these
10	The special theory of relativity is based on the	one postulate two postulates three postulates four postulates
11	The general theory of relativity treats problems involving	inertial frame of references accelerating frame of references both of these none of these
12	The special theory of relativity treats problems invoving	inertial frame of references accelerating frame of references both of these none of these
13	A non-inertial frame of reference is one, in which	law of inertial is valid all laws of physics are the same in all frames a>0 or a<0 a=0
14	An inertial frame is that frame in which	a>0 a=0 a<0 none of these
15	Which of the following is not an example of intertial frame	a body placed on the surface of earth a body placed in a car moving with uniform velocity a body placed in a car moving with same acceleration none of these

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