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8201.

What is advantage of using LED over bulb in testing the electrical conductivity of liquids? Choose the wrong option.

Answer»

What is advantage of using LED over bulb in testing the electrical conductivity of liquids? Choose the wrong option.


8202.

How is rotation different from revolution?

Answer»

How is rotation different from revolution?

8203.

The expansion of a substance on heating is called ___ expansion.

Answer»

The expansion of a substance on heating is called ___ expansion.

8204.

From the given options which one will not conduct electricity?

Answer»

From the given options which one will not conduct electricity?


8205.

Draw a neat and labelled diagram of the human ear. Explain it working.

Answer»

Draw a neat and labelled diagram of the human ear. Explain it working.

8206.

If a sound wave takes 8.4 s to complete 4 cycles, then its time period is?

Answer»

If a sound wave takes 8.4 s to complete 4 cycles, then its time period is?


8207.

Given only one ray of light from the object, where will the image be formed?

Answer»

Given only one ray of light from the object, where will the image be formed?


8208.

Differentiate between the reflection of light from a plane mirror and that from a plane sheet of paper.

Answer»

Differentiate between the reflection of light from a plane mirror and that from a plane sheet of paper.

8209.

Where does the stars go in the morning?

Answer» Where does the stars go in the morning?
8210.

When we press the bulb of a dropper with its nozzle kept in water, air in the dropper seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. Give reason

Answer» When we press the bulb of a dropper with its nozzle kept in water, air in the dropper seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. Give reason
8211.

If we know the magnitude of net force acting on a body of a given mass which is initially at rest, with the help of Newton's second law, we can determine its:

Answer»

If we know the magnitude of net force acting on a body of a given mass which is initially at rest, with the help of Newton's second law, we can determine its:


8212.

What is a potential energy and a kinetic energy

Answer»

What is a potential energy and a kinetic energy

8213.

What is the effect of heat producing light is known as?

Answer»

What is the effect of heat producing light is known as?


8214.

Which of the following is true about a lightning conductor? Statement 1: It should be at a height more than the structure and should extend well below the ground. Statement 2: It should be at a height more than the structure and should just touch the ground.

Answer»

Which of the following is true about a lightning conductor?

Statement 1: It should be at a height more than the structure and should extend well below the ground.

Statement 2: It should be at a height more than the structure and should just touch the ground.


8215.

What is the best definition for pressure ?

Answer»

What is the best definition for pressure ?

8216.

A man weighing 80 kg carries a weight of 40 kg on the top of a tower 60 m high. Find the work done by the man. Take g=10m/s2.

Answer»

A man weighing 80 kg carries a weight of 40 kg on the top of a tower 60 m high. Find the work done by the man. Take g=10m/s2.

8217.

The electrode used in electrolysis is made of

Answer»

The electrode used in electrolysis is made of

8218.

What is Pascal's law?

Answer»

What is Pascal's law?

8219.

Question 1 (a) Fill in the blanks. Most liquids that conduct electricity are solutions of _____,______ and _____.

Answer»

Question 1 (a)
Fill in the blanks.

Most liquids that conduct electricity are solutions of _____,______ and _____.

8220.

Why are ships and boats are made of streamlined?

Answer»

Why are ships and boats are made of streamlined?

8221.

If ABCD is a parallelogram and AE = 12 units, then what is the length of AC?

Answer»

If ABCD is a parallelogram and AE = 12 units, then what is the length of AC?


8222.

Why we take short steps on slippery surfaces ?

Answer» Why we take short steps on slippery surfaces ?
8223.

There might be something which create or produces gravitational force inside the core of the earth . Some thing like a matter or material what is that?

Answer» There might be something which create or produces gravitational force inside the core of the earth . Some thing like a matter or material what is that?
8224.

How can we check the thermal conductivity of an element or a compound?

Answer» How can we check the thermal conductivity of an element or a compound?
8225.

Which is the brightest star

Answer» Which is the brightest star
8226.

Question 10 (vi) State whether the following statement is ‘True’ or ‘False’ The plane in which the earth revolves around the sun is called equatorial plane of earth.

Answer» Question 10 (vi)

State whether the following statement is ‘True’ or ‘False’

The plane in which the earth revolves around the sun is called equatorial plane of earth.
8227.

Sir I am Shaun job of class 10, I have a doubt in physics on the topic of optics , this is the question Sir, Can you tell what is the defect of using convex mirrors as rear view mirrors ?, Please explain using ray diagrams , In the video on convex mirrors my teacher says that when an object is very close to the convex mirror there are blind spot's as a ray Comming from that does not reach us, please explain this statement also if you can,Sir, Is there any way in which we can circumvent this problem, Thank you for your time Sir Shaun

Answer»

Sir

I am Shaun job of class 10, I have a doubt in physics on the topic of optics , this is the question Sir,

Can you tell what is the defect of using convex mirrors as rear view mirrors ?, Please explain using ray diagrams , In the video on convex mirrors my teacher says that when an object is very close to the convex mirror there are blind spot's as a ray Comming from that does not reach us, please explain this statement also if you can,Sir,

Is there any way in which we can circumvent this problem,

Thank you for your time Sir

Shaun

8228.

Why does the lead of a pencil become smaller after use?

Answer»

Why does the lead of a pencil become smaller after use?

8229.

What is the minimum distance of obstacle for an echo to be heard in air?

Answer» What is the minimum distance of obstacle for an echo to be heard in air?
8230.

Which device is used to protect the buildings from the effect of lightning?

Answer»

Which device is used to protect the buildings from the effect of lightning?


8231.

State three safety measures that you will observe in the thunderstorm.

Answer»

State three safety measures that you will observe in the thunderstorm.

8232.

A sound wave having a wavelength of 2 cm is travelling in water. If the velocity of sound in water is 1600ms−1, find the frequency of the sound wave.

Answer»

A sound wave having a wavelength of 2 cm is travelling in water. If the velocity of sound in water is 1600ms1, find the frequency of the sound wave.


8233.

The process by which a solid directly converts into its vapor state is called___

Answer»

The process by which a solid directly converts into its vapor state is called___

8234.

Suspend two plastic balls as shown in the figure. A glass rod is rubbed with silk to make it charged. One of the balls is touched with the glass rod and the other is touched with the silk.What can we observe? Give reason for the observation. [3 MARKS]

Answer»

Suspend two plastic balls as shown in the figure. A glass rod is rubbed with silk to make it charged. One of the balls is touched with the glass rod and the other is touched with the silk.What can we observe? Give reason for the observation. [3 MARKS]

8235.

What is drag in fluids? How is it related to viscosity? On what factors does it depend? [3 MARKS]

Answer»

What is drag in fluids? How is it related to viscosity? On what factors does it depend? [3 MARKS]

8236.

1∘C rise in temperature is equal to a rise of

Answer»

1C rise in temperature is equal to a rise of


8237.

The pressure at the top of a well water is P1, and at the depth of h from the top is P2. Given the density of water is ρ. Which of the following relation is correct?

Answer»

The pressure at the top of a well water is P1, and at the depth of h from the top is P2. Given the density of water is ρ. Which of the following relation is correct?

8238.

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown in figure below. Which one of them is correct?

Answer»

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown in figure below. Which one of them is correct?


8239.

In which season the big dipper can be seen in the Northern Sky?

Answer»

In which season the big dipper can be seen in the Northern Sky?


8240.

The floating of an objet in a fluid depends on ___.

Answer»

The floating of an objet in a fluid depends on ___.


8241.

What is the advantage of using LED in testing the electrical conductivity of liquids?

Answer»

What is the advantage of using LED in testing the electrical conductivity of liquids?

8242.

Name the device which is used between the hubs and axles of bicycle wheels to reduce friction.

Answer»

Name the device which is used between the hubs and axles of bicycle wheels to reduce friction.

8243.

Why is the shape of the rainbow round?

Answer» Why is the shape of the rainbow round?
8244.

Name the quantity from below which determines the loudness of a sound wave : (a) Wavelength (b) Frequency, and (c) Amplitude.

Answer»

Name the quantity from below which determines the loudness of a sound wave :

(a) Wavelength

(b) Frequency, and

(c) Amplitude.

8245.

When a glass rod is rubbed with a piece of silk cloth,

Answer»

When a glass rod is rubbed with a piece of silk cloth,


8246.

Which of the following is not a part of the human eye? (a) the lens moves in or out (b) the retina moves in or out (c) the lens becomes thicker or thinner (d) the pupil becomes larger or smaller

Answer»

Which of the following is not a part of the human eye?

(a) the lens moves in or out

(b) the retina moves in or out

(c) the lens becomes thicker or thinner

(d) the pupil becomes larger or smaller

8247.

Explain the terms [3 MARKS] 1. Diffused Reflection 2. Regular Reflection

Answer»

Explain the terms [3 MARKS]
1. Diffused Reflection
2. Regular Reflection

8248.

Which of the following features is not found on the surface of the moon?

Answer»

Which of the following features is not found on the surface of the moon?


8249.

Which statement is true in case of multiple forces acting on an object in the same direction?

Answer»

Which statement is true in case of multiple forces acting on an object in the same direction?


8250.

How would the absence of friction change the world around us?

Answer» How would the absence of friction change the world around us?