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4201.

If X and Y represent the lower and upper limits of the temperature range of the given thermometer then the value of X and Y will be:

Answer»

If X and Y represent the lower and upper limits of the temperature range of the given thermometer then the value of X and Y will be:


4202.

Why is the force lesser when we make the hole in the upper most layer?

Answer» Why is the force lesser when we make the hole in the upper most layer?
4203.

1When a current flows through a conductor AB from one end A to the other end B, the charge carriersmotion are(A) protons from A to B(B) electrons from A to B(C) protons from B to A(D) electrons from B to AThe

Answer» 1When a current flows through a conductor AB from one end A to the other end B, the charge carriersmotion are(A) protons from A to B(B) electrons from A to B(C) protons from B to A(D) electrons from B to AThe
4204.

How can a balanced force change shape of an object?

Answer» How can a balanced force change shape of an object?
4205.

If a particle is restricted to move only along a straight line, then its motion is

Answer»

If a particle is restricted to move only along a straight line, then its motion is


4206.

21. While using the formula w=vq The value of q will be of which potential. potential A or B?

Answer» 21. While using the formula w=vq The value of q will be of which potential. potential A or B?
4207.

The relation between load and tension in the following pulley system is

Answer»

The relation between load and tension in the following pulley system is


4208.

Question 06.1 Fill in the blanks in the following. A person 1 m in front of a plane mirror seems to be _____m away from his image.

Answer» Question 06.1
Fill in the blanks in the following.

A person 1 m in front of a plane mirror seems to be _____m away from his image.
4209.

When an object is touched with the metal top of an electroscope, its aluminium leaves diverge. What concludion do you get from this observation?

Answer»

When an object is touched with the metal top of an electroscope, its aluminium leaves diverge. What concludion do you get from this observation?

4210.

How are different sound notes generated in musical instruments like guitar, which uses strings for sound generation, and flute, which uses blown air for sound generation?

Answer» How are different sound notes generated in musical instruments like guitar, which uses strings for sound generation, and flute, which uses blown air for sound generation?
4211.

25.An aqueous solution of 0.01M KCl causes the same elevation in boiling point as an aqueous solution of urea . The concentration of urea solution is ??

Answer» 25.An aqueous solution of 0.01M KCl causes the same elevation in boiling point as an aqueous solution of urea . The concentration of urea solution is ??
4212.

Two metallic objects A and B are brought in contact with each other but no heat transfer occurs between them. What could be the possible reason for this?

Answer»

Two metallic objects A and B are brought in contact with each other but no heat transfer occurs between them. What could be the possible reason for this?


4213.

Describe an experiment to determine the density of the material of a coin.

Answer»

Describe an experiment to determine the density of the material of a coin.



4214.

Differentiate between positive charge and negative charge.

Answer» Differentiate between positive charge and negative charge.
4215.

Refractive index of a rectangular glass slab is μ=√3. A light ray incident at an angle 60∘ is displaced laterally through 2.5 cm. Distance travelled by light in the slab is

Answer»

Refractive index of a rectangular glass slab is μ=3. A light ray incident at an angle 60 is displaced laterally through 2.5 cm. Distance travelled by light in the slab is

4216.

What is free body diagram ? How many force can be in free body diagram?

Answer»

What is free body diagram ?

How many force can be in free body diagram?

4217.

Question 13The distance between the object and its image formed by a plane mirror appears to be 24cm. What is the distance between the mirror and the object?

Answer»

Question 13



The distance between the object and its image formed by a plane mirror appears to be 24cm. What is the distance between the mirror and the object?



4218.

If you are standing next to the road, why does the pitch of the siren of police car change as it comes toward you?

Answer»

If you are standing next to the road, why does the pitch of the siren of police car change as it comes toward you?


4219.

An empty container ship has a fourth of its body under water. Safety regulations state that atleast a third of its body must be above the water. How much goods can it carry?The weight of the ship alone is W.

Answer» An empty container ship has a fourth of its body under water. Safety regulations state that atleast a third of its body must be above the water. How much goods can it carry?

The weight of the ship alone is W.
4220.

A 1 cm long string vibrates with fundamental frequency of 256 Hz. If the length is reduced to 14 cm keeping the tension unaltered, the new fundamental frequency will be [BHU 1997]

Answer»

A 1 cm long string vibrates with fundamental frequency of 256 Hz. If the

length is reduced to 14 cm keeping the tension unaltered, the new

fundamental frequency will be

[BHU 1997]


4221.

Does electromagnet have South pole & North Pole?

Answer» Does electromagnet have South pole & North Pole?
4222.

Question 1 (d) Fill in the blank. The process of depositing a layer of any desired metal on another material by means of electricity is called ________.

Answer»

Question 1 (d)
Fill in the blank.
The process of depositing a layer of any desired metal on another material by means of electricity is called ________.

4223.

6.2000 small bulbs each weighing 1g each, strike 1 square cm of areaper sec with velocity =1000 and rebound with same velocity. find pressure on surface

Answer» 6.2000 small bulbs each weighing 1g each, strike 1 square cm of areaper sec with velocity =1000 and rebound with same velocity. find pressure on surface
4224.

a pendulum which keeps correct time at a place where g=9.81 m/s2 it taken to a place where g=9.8m/s2. calculate by how much it will lose or gain in a day.

Answer» a pendulum which keeps correct time at a place where g=9.81 m/s2 it taken to a place where g=9.8m/s2. calculate by how much it will lose or gain in a day.
4225.

Expalin how earthquake is caused by the disturbance inside the earth. [5 MARKS]

Answer»

Expalin how earthquake is caused by the disturbance inside the earth. [5 MARKS]

4226.

You have mkg of a certain liquid in a vessel, which is heated till there is a temperature change of ΔT. If the coefficient of volume expansion is γ, what is the density of the liquid after heating, if the initial density was ρ?

Answer»

You have mkg of a certain liquid in a vessel, which is heated till there is a temperature change of ΔT. If the coefficient of volume expansion is γ, what is the density of the liquid after heating, if the initial density was ρ?

4227.

Why is it difficult to pull out a rubber sucker stuck to surface like glass? [5 MARKS]

Answer»

Why is it difficult to pull out a rubber sucker stuck to surface like glass? [5 MARKS]

4228.

If star change their position then why the constellations remains same ?

Answer» If star change their position then why the constellations remains same ?
4229.

an ideal gas has a specific heat capacity of molar heat capacity at constant pressure Cp= 5R/2 the gas is kept in a closed vessel of volume 0.083 metre cube at a temperature of 300 k and a pressure of 1.6* 10^6 N m^-2 and amount of 2.49* 10^4 J of heat energy supplied on the gas calculate the final temperature and pressure of the gas

Answer» an ideal gas has a specific heat capacity of molar heat capacity at constant pressure Cp= 5R/2 the gas is kept in a closed vessel of volume 0.083 metre cube at a temperature of 300 k and a pressure of 1.6* 10^6 N m^-2 and amount of 2.49* 10^4 J of heat energy supplied on the gas calculate the final temperature and pressure of the gas
4230.

Two positively charged balls are suspended freely as shown below. Which of the following depicts the behaviour of the balls?

Answer»

Two positively charged balls are suspended freely as shown below. Which of the following depicts the behaviour of the balls?



4231.

A ball of mass 1 kg moving with a velocity of 10 m/s at time t=1 s. At time t=2 s, it is moving with velocity of 20 m/s. Net force that acted on the body in this duration of time is

Answer»

A ball of mass 1 kg moving with a velocity of 10 m/s at time t=1 s. At time t=2 s, it is moving with velocity of 20 m/s. Net force that acted on the body in this duration of time is


4232.

A particle starts from origin O, from rest, and moves with a uniform acceleration, along the positive x−axis. Identify all figures that correctly represent the motion qualitatively (a= acceleration, v= velocity, x=displacement, t= time)

Answer»

A particle starts from origin O, from rest, and moves with a uniform acceleration, along the positive xaxis. Identify all figures that correctly represent the motion qualitatively (a= acceleration, v= velocity, x=displacement, t= time)




4233.

Electrical force is acting between two charge kept in vacuum. A copper plate is placed between the charges, the force now is ?

Answer» Electrical force is acting between two charge kept in vacuum. A copper plate is placed between the charges, the force now is ?
4234.

Which of the following correctly describes friction?

Answer»

Which of the following correctly describes friction?


4235.

33.Two identical metal spheres possess +60c & -20c of charges. They are brought in contact &then separated by 10cm. The force between them is

Answer» 33.Two identical metal spheres possess +60c & -20c of charges. They are brought in contact &then separated by 10cm. The force between them is
4236.

In the case of concentration, the volume is taken is in which one milli litre or litre ?

Answer» In the case of concentration, the volume is taken is in which one milli litre or litre ?
4237.

Question 5 (b)In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.(b)Taking out paste from a toothpaste tube.

Answer»

Question 5 (b)

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.

(b)Taking out paste from a toothpaste tube.



4238.

Question 1Distinguish between loudness and intensity of sound.

Answer» Question 1

Distinguish between loudness and intensity of sound.
4239.

Why do incandescent lamps(filament bulbs) glow when electricity flows through them? [5 MARKS]

Answer»

Why do incandescent lamps(filament bulbs) glow when electricity flows through them?
[5 MARKS]

4240.

What is the difference between kinetic and sliding friction

Answer» What is the difference between kinetic and sliding friction
4241.

Explain why : (a) a pencil will write on paper but not on glass. (b) climbing a greasy pole is very difficult.

Answer»

Explain why : (a) a pencil will write on paper but not on glass. (b) climbing a greasy pole is very difficult.

4242.

The image formed by a pinhole camera is of the same size as the object. True or false? justify your answer.

Answer» The image formed by a pinhole camera is of the same size as the object. True or false? justify your answer.
4243.

Sound is produced in our vocal cords. What is the difference in the vocal cords of men and women?

Answer» Sound is produced in our vocal cords. What is the difference in the vocal cords of men and women?
4244.

How is the pitch of sound in a guiter changed if (a) thin wire is used, (b) wire under less tension is used ?

Answer»

How is the pitch of sound in a guiter changed if

(a) thin wire is used,

(b) wire under less tension is used ?

4245.

A block is pushed on a rough surface with a force of 50N. If the limiting friction for the block is 80N, then the frictional force acting on the block is

Answer»

A block is pushed on a rough surface with a force of 50N. If the limiting friction for the block is 80N, then the frictional force acting on the block is




4246.

In a ball bearing, if the balls are mot present, what will happen

Answer»

In a ball bearing, if the balls are mot present, what will happen

4247.

If a flute player playa a note with all holes covered, will it be a high pitch or low pitch? Please explain the concept.

Answer» If a flute player playa a note with all holes covered, will it be a high pitch or low pitch? Please explain the concept.
4248.

Consider the following statements and choose the correct option.1. Magnetic field lines form closed loops.2. No two field lines intersect

Answer»

Consider the following statements and choose the correct option.

1. Magnetic field lines form closed loops.

2. No two field lines intersect



4249.

x⁴-(x-z)⁴

Answer» x⁴-(x-z)⁴
4250.

Can we use copper wire as a fuse wire? Give reason.

Answer»

Can we use copper wire as a fuse wire? Give reason.