Question : During the motion of a projectile fired from the Earth's surface, ___________.

Option 1: its kinetic energy remains constant

Option 2: its momentum remains constant

Option 3: vertical component of its velocity remains constant

Option 4: the horizontal component of its velocity remains constant

Question : According to the second law of motion, for a given force, acceleration is inversely proportional to the _______ of the object.

Option 1: density

Option 2: volume

Option 3: force

Option 4: mass

Question : The motion of an object is ______ if its velocity is constant.

Option 1: only accelerating

Option 2: only decelerating

Option 3: non-uniform

Option 4: uniform

Question : Absolute zero is defined as:

Option 1: the temperature at which all molecular motion ceases.

Option 2: at which water boils at 298K.

Option 3: at which liquid helium boils.

Option 4: at which the volume becomes zero.

Question : In hydel power station, the motion produced in turbines is due to:

Option 1: flow of water

Option 2: burning of coal

Option 3: burning of diesel

Option 4: production of steam