Question 1 :
A force on an object that is perpendicular to a common contact surface is called<br>

Question 2 :
A physics student is performing a experiment in which she twirls&#160; rubber stopper at the end of a string around in a circle at nearly constant speed and tries to determine its acceleration. Which of the following single changes would enables her to most nearly double the acceleration of the rubber stopper?

Question 3 :
'The action and reaction both act simultaneously.' Is this statement true and what is the net force ?

Question 4 :
When a man pushes on his cart, the man moves because of:

Question 5 :
If a car is moving at a velocity $v$ in a circular road with coefficient of friction $\mu$ and banking angle $\theta$. Find the radius of the road such that friction force doesn't act on the car in the radial direction.

Question 6 :
A simple pendulum rotates in a horizontal plane with an angular velocity $\omega$ about a fixed point P in a gravity free space. There is a negative charge at P. The bob gradually emits photo electrons(Leave the energy and momentum of incident photons and emitted electrons). The total force acting on the bob is $T$ .<br/>

Question 7 :
A car driven round curved path of radius $18m$ without the danger of skidding. The coefficient of friction between the tyres of the car and the surface of the curved path is $0.5$. What is the maximum speed in kmph of the car for safe driving nearly? ($g=10{ms}^{-2}$)

Question 8 :
Assertion: STATEMENT-1 : If the mass of the colliding particles remains constant, then the linear velocity of the individual particles change during collision along common normal direction. Reason: STATEMENT-2 : A pair of equal and opposite impulses act along common normal direction.

Question 9 :
A disc revolves with a speed $33\frac{1}{3}$ rev/min, and has a radius of 15 cm. Two coins A and B are placed at 4cm and 14 cm away from the centre of the disc. If the coefficient of friction between the coins and the disc is 0.15, which of the coins will revolve with the road?

Question 10 :
A wheel of radius r rolling on a straight line, the velocity of its centre being v. At a certain instant the point of contact of the wheel with the grounds is M and N is the highest point on the wheel(diametrically opposite to M). The incorrect statements is?

Question 11 :
In case of variable mass what will be the general equation of force?

Question 13 :
Which of the following is not an example of potential energy?

Question 14 :
&#160;A $500$ gm gun fires a $2 gm$ projectile with a muzzle velocity of $1600ms^{-1}$. The velocity of the gun is:<br/>

Question 15 :
A ball of mass M moving with a velocity V collides head on elastically with another of same mass but moving with a velocity v in the opposite direction. After collision,<br>

Question 16 :
Identify which of the following quantities remain conserved during an elastic collision? <br/>

Question 17 :
A running man has half the kinetic energy of a running boy of half his mass. The man speeds up by $1\ m/s$ and then has $K.E.$ as that of the boy. What were the original speeds of man and the boy?

Question 18 :
Two objects both of masses $100&#160;g$ are moving along the same line and direction with velocities of $2\ ms^{-1}$ and $1\ ms^{-1}$, respectively. They collide and after the collision, the first object moves at a velocity of $1.67\ ms^{-1}$. Determine the velocity of the second object:<br/>

Question 19 :
A body is displaced from $(0,0)$ to $(1m,1m)$ along the path $x=y$ by a force&#160;$F = \left( {{x^2}\hat j&#160;+ y\hat i} \right)N$. The work done by this force will be :

Question 20 :
Identify the correct statements from the following :<br/><br/>a) The collisions between the nuclei and&#160;fundamental particles are considered as elastic collisions.<br/>b) Emission of an alpha particle by $U^{235}$&#160;is an &#34;elastic collision&#34;.<br/>c) The collision between two ivory balls is&#160;considered as &#34; elastic collision&#34;.<br/>d) A running man jumps into a train. It is an&#160;&#34;elastic collision&#34;.<br/>

Question 21 :
Two identical balls A and B collide head on elastically. If velocities of A and B, before the collision are +0.5 m/s and -0.3 m/s respectively, then their velocities, after the collision, are respectively

Question 22 :
A ball is dropped from a height of 45 m from the ground. The coefficient of restitution between the ball and the ground is 2/3. What is the distance travelled by the ball in 4th second of its motion. Assume negligible time is spent in rebounding :Take $g = 10 m &#160;s^2$

Question 23 :
A sphere of mass m moving with velocity u h its another stationary sphere of same mass. If e is the coefficient of restitution, what is the ratio of velocities of two spheres after the collision?

Question 24 :
Given $\overline { a } + \overline { b } + \vec { c } + \overline { d } = 0$ , which of the following statements is/are not a correct statement?

Question 25 :
A ball kept at a height of $5$m, is allowed to fall freely. It hits the ground. The coefficient of restitution is $0.6$ What is the time interval between the first nd second rebound?($g=10m/s^{2}$)

Question 26 :
The work done to increase the velocity of a car from $30\,m/s$ to $40\,m/s,$ if the mass of the car is $1000\,kg$ is