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What is the name of passage in outer ear which carries sound waves to the ear - drum ?

Unit of measurement for length or breadth can be taken as

When a net force acts on an object, the object will be accelerated in the direction of force with an acceleration proportional to

Which of the following statements is correct about uniform circular motion?

Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?

(a) 15,000 Hz

(b) 10 kHz

(c) 50 kHz

(d) 10,000 Hz

Name the S.I. unit of heat and how is it related to the unit calorie ?

Why the pressure on the ground is more when a man is walking than he is standing?

A water pump pumps water to a height of 20 m at the rate of 2 kg/s. What is the mechanical power developed by the power? $(g=10m/s^2)$

Figure shows the velocity-time graph of a particle moving in a straight line.

(i) State the nature of motion of particle.

(ii) Find the displacement of particle at t=6 s.

(iii) Does the particle change its direction of motion?

(iv) Compare the distance travelled by the particle from 0 to 4 s and from 4 s to 6 s.

(v) Find the acceleration from 0 to 4 s and retardation from 4 s to 6 s.

A force acts for 0.1 sec on a body of mass 2kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2m/s . Find the magnitude of force

Which of the following mentioned below can hear infrasonic sound or infrasound?

A man having a mass of 70 kg is riding a scooter of mass 80 kg what is the total kinetic energy if the velocity of the scooter is 10 m/s?

Distance covered by a body from velocity-time graph is

Gravitational force does not depend on

State how the velocity-time graph can be used to find
(i) the acceleration of a body,
(ii) the distance travelled by the body in a given time, and
(iii) the displacement of the body in a given time.

mathematical formulation of second law of motion

why a horse continuously apply force in order to move a cart with a constant velocity?

Which of the following travels slowest in air and which one fastest ?

Supersonic aircraft, Light, Sound

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?

Statement 1: The gravitational force between the stones is very small (in the range of ${10}^{-11}N)$.

Statement 2: Stones are lying on a flat surface, so they cannot move.

Statement 3: The gravitational force between the bodies cannot overcome the friction.

Statement 4: The stones are irregular in shape, so they cannot move.

Which statements explains the reason for the above question?

A boy fires a gun and another boy at a distance hears the sound of fire 2.5 s after seeing the flash. If speed of sound in air is 340 m $s^{-1}$, find distance between the boys.

Two bullets of mass 250 g moving in opposite directions with a speed of 500 m/s and 250 m/s collide with a stationary block of mass 12 kg. If the bullets stick to the block and all of them move together, what is the the final velocity of the system?

Can the 2 objects colliding have different mass in conservation of momentum?

A student uses a screw gauge to measure the diameter of a wire. However, it has a zero error as shown below, when it is used to take a reading, it must be corrected by:

The C.G. of a body

A bus moving with a speed 72km/h can be stopped by breaks after atleast 10 m. What will be the minimum stopping distance, if the same bus is moving at a speed of 144km/h?

Write the situation of echo

The ratio of average velocity to average speed is 1 always equal to Unity 2 always greater than Unity 3 always less than Unity or 4 may be less than or equal to Unity

A bullet is fired with a speed of 1000 m/s squared to hit a target 100 m away . If g=10 m/s squared , the gun should be aimed at

a) directly towards target

b) 5 cm below target

c) 5 cm above target

d) 15 cm above target

Suppose a ball is thrown vertically upward then is the time taken to reach the zero velocity(while going up) is equal to time taken to come to the same position(from where it was thrown) or ground . If yes , give the reason

Rahul is standing in front of a plane mirror. The distance between Rahul and his image is 150cm. If Rahul's distance from the mirror is x. What could be the possible value of x?

A cannon ball of mass 2 kg is fired at a target 500 meters away. The 400 kg cannon recoils with a velocity of $2m{s}^{-1}$. Assuming cannon ball moves with constant velocity, when will it hit the target?

An object OA is placed in front of the concave mirror as given in the image. The point F is the focal length of the mirror and P is the pole. Determine the distance of the image from the pole of the concave mirror.

What do you mean by inertia ?

A bullet travelling with a velocity of 16m/s penetrates a tree trunk and comes to rest in 0.4m. Find the time taken during the retardation.

A screw gauge, when closed without anything in between it, shows reading as shown below. Determine the zero correction for it if the least count of the screw gauge is 0.01 mm.

The light ray parallel to the principal axis will:

(a) Explain the term 'pitch' of a sound. On what factor does the 'pitch' of a sound depend ?

(b) Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.

When are eclipse seasons?

One of the following is not a vector quantity. This one is :

(a) displacement (b) speed (c) acceleration (d) velocity

Classify the following amongst contact and non-contact forces:
(a) frictional force,
(b) Normal reaction
(c) force of tension in a string,
(d) gravitational force,
(e) electrostatic force,
(f) magnetic force.

What is meant by measurement ?