PHYSICS

According to the third law of motion, action and reaction

• always act on the same body

• always act on different bodies in opposite directions

• have same magnitude and directions

• act on either body at normal to each other

The inertia of an object tends to cause the object

• to increase its speed

• to decrease its speed

• to resist any change in its state of motion

• o decelerate due to friction

Rocket works on the principle of conservation of

• MASS

• ENERGY

• MOMENTUM

• ALL

When a car at high speed makes a sharp turn, the driver in a car tends to get thrown to the side opposite to the turn. This is due to the

(a)otion inertia of m

(b) inertia of time

(c) inertia of rest

(d) inertia of direction

Answer

Answer: (a) inertia of motion

• INERTIA AT MOTION

• INERTIA AT REST

• INERTIA AT DIRECTION

• NONE OF THESE

The graph of the velocity against the time of a moving object is shown below. What is the displacement between t = 3 and t = 5?

• 4m

• 2m

• equal or close to zero

• -4m

• -2m

If the object is not moving then the friction force applied is called......

• static

• kinetic

• dynamic

• drag

• unbalanced

If applied force on an object is 30N and the object is at rest then the net force acting on the object is...

• 90N

• 60N

• 30N

• 15N

• 0N

Which quantities are measured in the same unit?

• energy, power and work

• energy and power but not work

• energy and work but not power

• power and work but not energy

Which energy transfer takes place when a matchstick burns?

• Chemical to thermal

• chemical to nuclear

• nuclear to chemical

• thermal to chemical

Which instrument is used to measure Atmospheric pressure ?

• Anemometer

• Barometer

• Thermometer

• Galvanometer