Question 1 :
The force acting on a mass of 1 g due to the gravitational pull on the earth is called 1 g-wt. One g-wt equals :
Question 2 :
Assertion: Heavier bodies fall with greater acceleration.
Reason: Gravitational force is stronger on heavier bodies.
Question 5 :
The radius of earth is about $6400$ km and that of mars is $3200$ km . Thus mars of the earth is about 10 times mass of mars. An object weighs 200 N on the surface of earth. Then its weight on the surface of mars will be
Question 6 :
Water from a hose pipe of radius $5$cm strikes a wall normally at a speed of $5$ $ms^{-1}$. The force exerted on the wall in newton is:
Question 7 :
The acceleration due to gravity on the moon is $1/6th$ of that on the earth. If a man can jump upto a height of $1\ m$ on the surface of the earth, how high he can jump on the surface of the moon?
Question 8 :
A spherical planet far out in space has a mass ${M}_{0}$ and diameter ${D}_{0}$. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to:
Question 9 :
A ball with a weight of 20 N is thrown vertically upward . What is the acceleration of the ball just as it reaches the top of its path ?
Question 10 :
A force of $\left( 7\hat { i } +6\hat { k } \right) $ newton makes a body move on a rough plane with a velocity of $\left( 3\hat { j } +4\hat { k } \right)\ m \ {s}^{-1} $. The power in watt is
Question 11 :
A research satellite of mass 200 kg circles the earth in an orbit of average radius $\displaystyle \dfrac{3\mathrm{R}}{2},$ where R is the radius of  the earth. Assuming the gravitational pull on a mass 1 kg on earth's surface to be 10 N, the pull on this satellite will be:<br/>
Question 13 :
It is said that the power of human heart is typically $10 W$ for a $70 kg$ adult. In one year time, the total energy required, expressed in $kWh$ will be approximately:
Question 14 :
A boy weighing $50\ kg$ eats bananas. The energy content of banana is $1000\ cal$, if this energy is used to lift the boy from ground, then the height through which he is lifted :
Question 15 :
A body attains a height equal to the radius of theearth when projected from earth' surface. Thevelocity of the body with which it was projected is.
Question 16 :
A mass is suspended from the end of a spring. When the system is oscillating the amplitude of oscillation is $4 \ cm$ and the maximum kinetic energy of oscillation of the system is $1\  joule$. Then the force constant of the spring is:
Question 18 :
The force needed to produce an acceleration of $6 m/s^2$ in a ball of mass $ 4 kg$ will be
Question 19 :
When a man sitting on a chair tries to lift himself by applying a force on the chair,
Question 21 :
When a horse pulls the tonga, the tonga moves forward due to:<br/>
Question 22 :
A bullet of mass $0.01 kg$ moving at a speed of $500 m/sec$, strikes a block of mass $2 kg$, suspended by a rope of length $5 m$. If the block rises to a height of $0.1 m$, then with what velocity does the bullet emerge from the block? <br>
Question 23 :
A bullet loses 1/20 of its initial velocity after penetrating a plank. How many plank's required to stop the bullet?
Question 24 :
Assertion: Water at the foot of the water fall is always at different temperature from that at the top.
Reason: The potential energy of water at the top is converted into heat energy during falling
Question 25 :
A rocket is propelled by a gas which is initially at a temperature of $4000 \ K$. The temperature of the gas falls to $1000 \ K$ as it leaves theexhaust nozzle. The gas which will acquire the largest momentum<br>while leaving the nozzle is
Question 26 :
A particle of mass 0.1 kg moving with an initial speed v collides with another particle of same mass kept at rest. If after collision the total energy becomes 0.2 J, then:
Question 27 :
Assertion: A cloth covers a table. Some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table.
Reason: For every action there is an equal and opposite reaction.
Question 28 :
If weight of a body is 1000 dyne, then the mass of the body will be(take g = 10ms$^{-}$ $^{2}$)
