MCQ Questions science 1.) The first law of motion introduced the concept of- a) Momentum b) Inertia c) Action and reactions d) Kinetic energy Answer: b) Inertia. 2.) According to first law of motion, the states of uniform motion and rest are …… a) Equal b) Unequal c) Non related d) None of these. Answer: a) Equal. 3.) Force is a physical quantity depends on a) Speed b) Mass c) Acceleration d) Both b and c Answer: d) Both b and c. Hint- Second law of motion. 4.) If a particles of mass 8 kg is moving with constant velocity of 20 m/s then net force on that object will be. a) 160 N b) 20 N c) 80 N d) 0 N Answer: (d) 0 N The object is moving with constant velocity so net force must be zero. 5.) If a ball of mass 200 gm is moving with 20 m/s then its momentum is a) 40 kg m/s b) 400 kg m/s c) 4 Kg m/s d) 0.4 kg m/s Answer: (c) 4 kg m/s. Mass = 200 gm = 0.2 kg, velocity = 20 m/s. As Momentum = 0.2 × 20 Momentum = 4 kg m/s. 6.) The SI unit of g is a) N m/kg b) N m²/kg c) N m² /kg² d) N² m² /
