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The same amount of force is applied to two different objects with different surface areas. In this scenario, which of the following statements is correct?

Choose the correct option which can represent Snell's law for a given set of media of air and water. Here $n,\theta$ represents refractive index of the medium and incident angle respectively.

There are 3 solid made up of aluminium,steel and wood,of the same shape and same volume. Which of them would have highest inertia?

Which of the following is never transferred with a wave?

Give an example to explain that the use of modern eco-friendly technologies is more efficient and less polluting.

A piece of wood if left under water, comes to the surface. Explain the reason.

Frictional force between layers of flowing fluid is known as

The upper limit of Ionosphere is –

What is the differance between dark energy and dark matter ?

A load of 4.0 kg is suspended from a ceiling through a steel wire of length 20 m and radius 2.0 mm. It is found that the length of the wire increases by 0.31 mm as equilibrium is achieved. Find Young modulus of steel. Take $g=3.1\pi m{s}^{-2}.$

An object of mass 2 kg is sliding with a constant velocity of 4 $m{s}^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

The velocity of a car is $18m{s}^{-1}$. Express this velocity in $km{h}^{-1}$.

Mention 2 factors which determine the momentum

A person standing on the edge of a cliff at some height above the ground throws first ball straight up with initial velocity, u, and then throws second ball straight down with the same initial velocity u. Which of the following statement is TRUE regarding their velocities when they hit the ground?

When a body is immersed in kerosene, it sinks. What relation could be established between the densities of the body and kerosene?

Is liquefied petroleum a gaseous fuel or a liquid fuel?

If an object is dropped from a height and it hits the ground with a velocity of 50m/s, then its initial velocity is taken as

A physical balance can be used to measure

.

Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, g =10 $m{s}^{-2}$ and $v_{sound}$ = 340 $m{s}^{-1}$.

Three different vibrating objects produce three types of sounds X, Y and Z. Sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in hospitals to break kidney stones of a patient into fine grains which then get flushed out with urine. The sound Y is similar to that which is produced during an earthquake before the main shock wave is generated.

(a) What type of sounds are (i) X (ii) Y, are (iii) Z ?

(b) Name one device which can produce sound like X.

(c) Name one device in a science laboratory which can produce sound like Y.

(d) Name one device in our homes which can produce sound like Z.

(e) What is the frequency range of sounds like Z ?

A light rope fixed at one end of a wooden clamp on the ground passes over a tree branch and hangs on the other side (as per the figure). It makes an angle of ${30}^{\circ }$ with the ground. A man weighing (60 kg) wants to climb up the rope. The wooden clamp can come out of the ground if an upward force greater than 360 N is applied to it. Find the maximum acceleration in the upward direction with which the man can climb safely. Neglect friction at the tree branch. Take g = 10 m/$s^2$.

In olden days, sailors used to find direction by suspending a piece of ___ magnet.

If a boy moves along the boundary of a square field of side 20 m in 40 s. What will be the magnitude of displacement of the boy at the end of 4 minutes 20 seconds?

A 900-kg compact car moving at 60 miles/hr has approximately 320,000 Joules of kinetic energy. Estimate its new kinetic energy if it is moving at 30 miles/hr.

What are the units of (a) work, and (b) energy ?

Name six different forms of energy?

(a) What remains constant in uniform circular motion?

(b) What changes continuously in uniform circular motion?

Critical angle is the angle of incidence for which the angle of refraction is -

Is it true that the amount of inertia is more when the amount of force applied on a body is more and less then less?

The length of a seconds' pendulum is nearly :

(a) 0.5 m (b) 9.8 m

(c) 1.0 m (d) 2.0 m.

why does an object float or sink when placed in the surface of the liquid

Round off the given measurement up to the first decimal place - 16.35

Two metallic objects A and B are brought into contact but there is no heat transfer between them. What could be the possible reason for this?

Name the S.I. Unit of mass and define it.

A particle moves with a uniform positive acceleration then :