Physics MCQ Set 1

Question : A second is defined as the duration of vibration of

1. Carbon atom
2. Cesium atom
3. Radium atom
4. Nitrogen atom

Question : The equation of state for n moles of an ideal gas is PV=nRT. The SI unit of universal gas constant R is

1. Erg K^-1 mole^-1
2. Watt K^-1 mole^-1
3. Newton K^-4 mole^-1
4. Joule K^-1(K mole)^-1

Question : Two farces of same magnitude are acting on an object, the magnitude of their resultant is minimum if the angle between them is

1. 45°
2. 60°
3. 90°
4. 180°

Question : If two forces each of magnitude 5N act along the same line on a body, then the magnitude of their resultant will be

1. 5N
2. 10N
3. 20N
4. 30N

Question : Applied force F on a body of mass m, moving with acceleration a is

1. m/a
2. a/m
3. ma
4. m : a

Question : A force of 1000N acts on a body for 0.01 sec. And changes its velocity from 10m/s to 20m/s, what will be the impulse?

1. 100 N-sec
2. 50 N-sec
3. 10 N-sec
4. 5 N-sec