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What is the relationship among magnitude of friction and weight of the object

Why can't we hammer a nail by its head on the wood

Observe the given images. What are the optical effects responsible for clear and unclear images of moon? [3 MARKS]

Insulators don't allow the ___ to flow through them.

The range of Akash supersonic surface-to-air missile is?

Why is it convenient to pull a luggage fitted with rollers?

Define the term relative density of a substance.

1 gf cm = N m = dyne cm

How much time does it take for one CFC molecule after it is released into the atmosphere, to destroy molecules of Ozone?

Surface tension is due to

In which of the following cases, electricity is not used?

What is the use of the lever, if its mechanical advantage is less than 1?

On the Celsius scale the absolute zero i.e. $0^{\circ }K$ is equal to_____.

A sound wave has a frequency of 1000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

Can you correctly deduce the net charge on an $N{a}^{+}$ ion from the below options?

Select the device that can be used to protect a building from lightning.

Himanshu was challenged by his friend Sushweta to differentiate between a plane, concave and convex mirror without touching them. He placed a candle in front of each of the mirrors and observed that they showed different behaviour. The mirror I always formed a diminished image, mirror II always formed an image of same height while for mirror III the image was enlarged when the candle was placed close to the mirror. Can you help him to identify them?

Differentiate between a electrochemical cell and a electrolytic cell. [5 MARKS]

Find the angle of refraction for a ray of light travelling from glass to air. Given angle of incidence is ${30}^{\circ }$ and refractive index of glass is ${\mu }_g=\sqrt{2}$.

The number of main stars in constellation A is 5, in constellation B is 7, in constellation C can be 7 or 8, whereas in constellation D is usually 9. Name the constellations A, B, C and D.

Which is easier to hold in hand : a kulhar (earthen pot) or a glass tumbler ? Why ?

Which of the following are non-contact forces?

Magnetic force, Frictional force, Gravitational force, Electrostatic force.

Through which one of the given mediums can an electrical charge be easily transferred from a charged object to another?

What is called moment in force and pressure

Why doesn't atmospheric pressure act on or crush non-living objects?

Why do we use Erlenmeyer flask instead of normal glass beakers in critical lab tests?

Acids contain _________ ions and bases contain _________ ions.

Car wheels often spin on icy roads. Explain why.

What do you understand by electricity at rest?

Give an example of use of fluid pressure.

Example of uniform retardation.

What is the melting point of ice in Fahrenheit scale?

Question 3

Light is falling on surfaces $S_1,S_2,and{S}_3$ as shown in the figure.




Surfaces on which the angle of incidence is equal to the angle of reflection is/are
(a) Only $S_1$
(b) $S_{1}and{S}_2$
(c) $S_{2}and{S}_3$
(d) All the three surfaces

What would be the temperature rise of a brass rod $(\alpha =2\times {10}^{-5}{}^{\circ }{C}^{-1})$ so as to increase its length by 1$\%$?

If there are 10 minor divisions between two major divisions, one major division representing $1^{\circ }C$, one minor division will be equal to:

Question 3
Alida runs her toy car on a dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
(a) wet marble floor, dry marble floor, newspaper and towel.
(b) newspaper, towel, dry marble floor, wet marble floor.
(c) towel, newspaper, dry marble floor, wet marble floor
(d) wet marble floor, dry marble floor, towel, newspaper

Two centimeters=_ decades

If a gentle stroke is given to the arm of the tuning fork, it ___.

Calculate the pressure at a depth of $50m$ below the surface of the sea. The density of sea water is $1024kg/m^3$.

( Accelaration due to gravity = $10m/s^2$)

Journey name is uniform circular motion

An ant moves along a circular thread with speed 10cm/sec it covers one circle in 10 minutes, chintu is a naughty boy who cuts the thread​ to make it straight line and challenges ant to reach the end in half of the time . What should be the constant acceleration that ant should maintain to complete his challenge.