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A violent tornado travels at a speed of about __ km/hr.

The loudness of sound depends on:

Vibrations cause sound. So if there are more vibrations sound will travel faster. In solids molecules are fixed, then how can sound travel faster in solids?

Question 2 (a)

Find the area of the following triangle:

In spectrum obtained with prism which colour is deviated minimum?

The temperature at which the second virial coefficient of real gas is zero is called

Water flow from ___ pressure to ___ pressure.

Himanshu starts from his home at 8:00 AM and reaches office by 9:00 AM. His office is 25 km away from his house. What is his actual speed at 8:45 AM?

Keepers are used to prevent ___ of magnet.

A/an ______ possesses magnetic energy allowing it to pull magnetic substances.

Which type of spherical mirror is used as reflectors at sharp turns or blind corners in big shopping malls or as rear-view mirrors in cars? [2 MARKS]

During which process does heat transfer take place through electomagnetic waves?

A horseshoe magnet haspoles.

Which of the following statements is incorrect about friction?

Choose the correct reflected ray for incident ray (NO).

Warm coffee is poured into a coffee mug and kept on a table, After some time we observe that coffee is not warm anymore, i.e., the temperature of coffee has decreased. Which among the following is the correct explanation for this phenomenon?

Which of the following statements is true about a convex mirror?

Which of the following would have the highest resistance?

Surface area of a circle is .

Question 1 (d)
Fill the missing word in the blank spaces in the following statements:
(d) Air moves from a region of $\underset{–}{}$ pressure to a region of $\underset{–}{}$ pressure.

On suspending a weight Mg, the length l of elastic wire and area of cross-section A its length becomes double the initial length. The instantaneous stress action on the wire is

In the graph below what is the speed of the vehicle between point A and B?

A person suffering from myopia is holding a mirror at 100 cm from his face. But he cannot look at it’s image. So he moves the mirror towards him by 40 cm. Find the distance by which his image moves.

A ball is dropped from the roof of a building. After every bounce, it's speed reduces to ( $\frac{1}{3}$) times its speed before hitting the ground. Out of the following graphs, which one shows the variation of velocity with time for first three bounces?

In a freely falling body, the interchange of potential to kinetic energy takes place _______.

Which of the following is not an artificial source of light?

The author refers to a "conveyor belt” in order to

What is the nature of light?

The images seen through a peep hole are different from those seen through normal holes, because these peep holes contain concave lenses. What happens when light rays are incident on a concave lens?

Question 7 (i)
Show the shape of the distance-time graph for the motion in the following cases:
(i) A car moving with a constant speed.

A bus decreases its speed from 80km/hr to 60 km/hr in 5 sec. Find the acceleration of the bus.

Question 5

If we denote speed by S, distance by D and time by T, the relationship between these quantities is

(a) $S=DT$

(b) $T=\frac{S}{D}$

(c) $S=\frac{1}{T}\times D$

(d) $S=\frac{T}{D}$

Sundial is a device that measures___.

Statement 1: It is necessary to keep a Barometer under the open sky to get the reading of atmospheric pressure.

Statement 2: Under a roof, the Barometer will give zero reading.

How the storms on earth are much smaller when compared to Jupiter?

In which process, the rate of transfer of heat is maximum

Experimental investigations show that the intensity of the solar radiation is maximum for a wavelength $4750\hat{A}$ in the visible region. If the surface temperature of the sun is 6000 K, what is the value of the Wien’s constant b?

A crane uses a mysterious object ‘X’ to separate magnetic materials from junk. The object ‘X’ is most probably _____.

In the given figure, OP is

Materials that are not attracted by magnet are called ___