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(a) What do you mean by the term 'free fall' ?
(b) During a free fall, will heavier objects accelerate more than lighter ones ?

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure. The pencil of light coming out of the hole falls on a mirror. Torch and point 'A' are equidistant from 'C'.



At which point should the eye be placed, so that the hole can be seen?

It takes 20 s for girl A to climb up the stairs while girl B takes 15 s for the same job. Compare : (i) the work done and (ii) the power spent by them.

The distance between any two celestial bodies is called

(a) What is sonar ? Explain its use.

(b) A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440~m/s).

A box follows a zigzag path to reach from point $A$ to $B$. The actual length of the path is $5m$ and the length of the straight line joining the two points is $2m$. If a force of $5N$ acts on the box then the work done on the box by the force is:

S.I. unit of temperature is :

(a) cal (b) joule

(c) celsius (d) kelvin

A radioactive element ${}_Z^{A}X$ loses two successive $\beta -particles$ and an $\alpha -particles$ such that resulting element is ${}_Q^{P}Y$. Find the values of P and Q in terms of A and Z.

Two objects of masses 200 and 400g are moving along the same line and direction with velocities of 4 metre per second and 2 metre per second respectively the line and after they collide and affir the collision the first object moves at a velocity of 1.6 metre per second determine the velocity ofthe second object

Two bodies of equal mass,m, with equal velocities,v, moving in opposite directions collide. The resultant velocity of the combination is?

Q66. With reference to SOHUM, consider the following statements:

1. It has been developed indigenously

2. It is a low-cost hearing screening device.

3. It is a device for the senior citizens.

Which of the above statement(s) is/are correct?

Upward force acting on a body submerged in a liquid is called ___.

For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more of the following faults:

(i) The resistors R₁ and R₂ have not been correctly connected in series

(ii) The voltmeter has not been correctly connected in the circuit

(iii) The ammeter has not been correctly connected in the circuit

Out of these three, the actual fault in the circuit is/are:

Captains of two cricket team decide to go for a stump shootout . The umpire pulls out the off and the leg stump and the middle stump is left standing. Both captains are asked to stand at the other end of the wicker and shoot a bullet at the top of the stump. The one who knocks over the stump wins . One captain shoots with a real bullet and the other shoots with a rubber bullet . If the mass and speed of both bullets are same which captain has a better chance of knocking the stump over ?

A fan of power $550W$ works for $3hours$. Calculate the energy consumed.

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be:

The Average amount of Sugar consumed by Joshua ranges from 20 to 30 grams. He follows a pattern :

On 1st Day of the month he starts with 20 gms and increases his intake by 0.5 gms per day till he reaches 30.

After that he starts dropping it by 1 gm per day till he comes back to 20.

What is the amount of Sugar consumed by him on the 26th day of the month?

In high jump competition the athlete is made to fall on a cushioned bed to:

An object is placed at a distance of 2f from a concave mirror of focal length f. What is the magnification of the image?

A current carrying conductor placed in a magnetic field experiences a force. The amount of force experienced by the current carrying conductor in the magnetic field can be increased by

For a concave mirror to form a virtual image of a real object where should the object be placed?

Question 11
In which of the following cases of motions, the distance moved and the displacement is same:
(a) If the car is moving on straight road
(b) If the car is moving in circular path
(c) The pendulum is moving to and fro
(d) The earth is revolving around the Sun

energy locked in the biomass gets converted into electrical energy for generating electricity.

Hockey ball of mass 200 gram travelling at 10 M per second is struck by a hockey stick so as to return it along its original path with a velocity of 5 M per second . Calculate the change of momentum occured in the motion of the hockey Ball by the force applied by the hockey stick.

Are supernovas Plasma?

A particle moving with an initial velocity of 5 m/s is subjected to a uniform acceleration of -2.5 m/$s^2$ . find the displacement in the next 4 seconds.

The weight of a metal block in air is $200N$. The block is then dipped in water and weighed again. If the weighing scale now reads $150N$, what is the weight of displaced water?

Which of the following is the correct gas equation?

A dog of weight $400N$ climbs up a cliff of height $10m$ in $40seconds$. The power expended by the dog is.

1. 1

A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the work done.

If two bodies A and B of different material are rubbed together, then

If the car is placed beyond the centre of curvature of the concave mirror, pick the correct image.

The earth has an average temperature of 33°C which makes life possible on earth. This is due to:

If a person can jump to a height of 9m on the moon, the height to which he can jump on the earth with the same effort is

The relation between frequency 'n' wavelength '$\lambda$' and velocity of

propagation 'v' of wave is[EAMCET 1979; CPMT 1976, 85]

In a sonar, ultrasonic waves are sent into the sea water and the reflected waves from a sunken ship are received after 2.0 s. Find the depth of the sunken ship if the speed of sound waves in sea water is $1450m{s}^{-1}$.

What are mechanical waves ?

Two holes of unequal diameters $d_1$ and $d_2$ $(d_1>d_2)$ are cut in a metal sheet. If the sheet is heated

A van is travelling at 52 km/h, when brakes are applied it comes to rest in 5 s. Another van is travelling at 3 km/h and when brakes are applied it comes to rest in 10 s. Plot the speed versus time graph and calculate the braking distance for both the vans? [3 MARKS]