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What is the scientific name given to the voice box which is present in human beings and enables us to speak?

If AB = 10 cm and DB = 40 cm (diameter). What is the radius of curvature and focal length?

What would be the impact on friction if a powder is sprinkled on the surface of the carrom board?

A pencil eraser loses tiny pieces of rubber each time you use it. Why does this happen?

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting the:

When charges move, they constitute a/an ___

Two like charges will:

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of the image is equal to the size of the object?

The SI unit of acceleration is ___.

Why are ball bearings used in machines?

Explain me the basics of heat transfer chapter

The density of mercury is about ___

Explain why, a book lying on a table in a room can be seen from all the parts of the room.

Name the kind of mirror used to obtain

(a) a real and enlarged image,

(b) a virtual and enlarged image,

(c) a real and diminished image, and

(d) a virtual and diminished image.

Which is a safe position during lightning?

state the path after reflection in a sperical mirror when the incident ray:

​​​​​A. Passes through the principal focus.

Sir...can we have a relative motion between two cars moving at different speeds. .. As I understand relative motion one object has to be stationed.. Plz clarify

What makes tap water a fairly good conductor of electricity?

Find the wavelength of the given wave.

London forces are important only at:

Is Richter scale linear? How does it help to estimate the destructive power of earthquake? [3 MARKS]

The device which is used to measure electric current through a circuit is called ___ .

Imagine, a comet is seen passing Uranus. The length of its tail was measured to be 3 km. What can be the possible length of its tail when it passes by Earth?

What would happen if we apply force on a matalic ball?will it change its shape?

Three statements regarding the precautions to be taken during lightning strikes:
I Avoid bathing during a lightning strike.
II Avoid the use of electrical appliances.
III Avoid sitting inside a car.
Among the given statements,

In which of the following diffusion occurs at faster rate?

how is sound produced

Which one is true about a pitch of a musical note in case of stringed instruments?

What keeps the air molecules from continuing to travel in the direction of propagation of the sound wave?

Out of a man and a woman :

(a) who has shorter vocal cords?

(b) who produces a sound of a higher pitch?

Decibel (dB) is a unit of loudness of sound. It is defined in a manner such that when the amplitude of the sound is multiplied by a factor of $\sqrt{10}$, the decibel level increases by 10 units. Loud music of 70 dB is being played at a function. To reduce the loudness to a level of 30 dB, the amplitude of the instrument playing music has to be reduced by a factor of:

What precautions would you take to protect yourself during an earthquake if you are outdoors?

A train at rest tends to move from the platform and it attains a speed of $100km/hr$ after a few seconds. While trying to come in motion, what force(s) does it needs to overcome?

Which of the following react(s) with water at normal room temperature?

Why are buses not designed to have a streamlined body?

The coefficient of apparent expansion of a liquid in a copper vessel is $C$ and in a silver vessel $S$. The coefficient of volume expansion of copper is ${\gamma }_C$. What is the coefficient of linear expansion of silver

Give one practical application of magnetic force

A test tube floats in water with a small coin at its bottom. The mass of this test tube is equal to mass of seven coins and the external volume is $16c{m}^3$. It just sinks when third coin is added. Calculate the mass of each coin.

List of contact and non -contact forces

mechanical waves lose energy as they travel through a medium.justify