9478 + Interview Questions in Physics Page 79 InterviewSolution

3901.	Sushweta has to send a laser signal to Garima. But she finds out that the signal misses Garima by 40. She asks Himanshu to rotate the mirror. By what angle should Himanshu rotate the mirror so that the signal reaches to Garima?
Answer» Sushweta has to send a laser signal to Garima. But she finds out that the signal misses Garima by $4^{0}$ . She asks Himanshu to rotate the mirror. By what angle should Himanshu rotate the mirror so that the signal reaches to Garima?

3901.

Sushweta has to send a laser signal to Garima. But she finds out that the signal misses Garima by 40. She asks Himanshu to rotate the mirror. By what angle should Himanshu rotate the mirror so that the signal reaches to Garima?

Answer»

Sushweta has to send a laser signal to Garima. But she finds out that the signal misses Garima by $4^{0}$ . She asks Himanshu to rotate the mirror.

By what angle should Himanshu rotate the mirror so that the signal reaches to Garima?

Discussion

3902.	Can a force act on an object even when it is not in contact with the object? Give examples.
Answer» Can a force act on an object even when it is not in contact with the object? Give examples.

Discussion

3903.	A body of density rho is dropped from rest from a height h into a lake of density Sigma ,Sigma is greater than rho neglecting all dissipative forces the maximum depth to which the body sinks before returning to float on surface
Answer» A body of density rho is dropped from rest from a height h into a lake of density Sigma ,Sigma is greater than rho neglecting all dissipative forces the maximum depth to which the body sinks before returning to float on surface

Discussion

3904.	6One end of a light spring of natural length d and spring constantRingk (=mg/d) is fixed on a rigid support and the other end is fixed to a smoothring of mass m which can slide without friction on a vertical rod fixed at adistance d from the support. Initially, the spring makes an angle of 37^° with the horizontal as shown in the figure. The system is released fromrest. The speed of the ring at the same angle subtended downward will be(A) /2gd37^° d37(B) /3gd(D) Vgd/2
Answer» 6One end of a light spring of natural length d and spring constantRingk (=mg/d) is fixed on a rigid support and the other end is fixed to a smoothring of mass m which can slide without friction on a vertical rod fixed at adistance d from the support. Initially, the spring makes an angle of 37^° with the horizontal as shown in the figure. The system is released fromrest. The speed of the ring at the same angle subtended downward will be(A) /2gd37^° d37(B) /3gd(D) Vgd/2

Discussion

3905.	Mention any 3 items that one should carry while visiting a snowy mountains.
Answer» Mention any 3 items that one should carry while visiting a snowy mountains.

Discussion

3906.	A bullet is fired from a gun. The force on the bullet is given by F = 600 - 2105 t, where F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel. What is the impulse imparted to the bullet.
Answer» A bullet is fired from a gun. The force on the bullet is given by F = 600 - 2105 t, where F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel. What is the impulse imparted to the bullet.

Discussion

3907.	What is the electrical potential difference?
Answer» What is the electrical potential difference?

Discussion

3908.	A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic proces
Answer» A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic proces

Discussion

3909.	ntn ntn nt charge Q1andQ2 lie inside and outside a closed surface s. let E is field at any point on S and phi is fiux of e over s which is wrong?n nta.if Q1 changes both E, phi will changen ntb.if Q1 not equal to 0and Q2 equal to 0 then E=o but phi not equal to 0n
Answer» ntn ntn nt charge Q1andQ2 lie inside and outside a closed surface s. let E is field at any point on S and phi is fiux of e over s which is wrong?n nta.if Q1 changes both E, phi will changen ntb.if Q1 not equal to 0and Q2 equal to 0 then E=o but phi not equal to 0n

Discussion

3910.	A wave sound produces 10 oscilllations in 100 m s.Find the time period of he wave
Answer» A wave sound produces 10 oscilllations in 100 m s.Find the time period of he wave

Discussion

3911.	State whether the following statements are true or false : (a) Rainwater is a non-conductor of electricity. (b) A piece of fresh potato does not conduct electricity at all.
Answer» State whether the following statements are true or false : (a) Rainwater is a non-conductor of electricity. (b) A piece of fresh potato does not conduct electricity at all.

Discussion

3912.	It is given that A = B^2. If A = 100 +- 0.20, then B is equal to (1.) 10 +- 0.20(2.) 10 +- 0.02(3.) 10 +- 0.01(4.) 10 +- 0.1
Answer» It is given that A = B^2. If A = 100 +- 0.20, then B is equal to (1.) 10 +- 0.20 (2.) 10 +- 0.02 (3.) 10 +- 0.01 (4.) 10 +- 0.1

Discussion

3913.	112.A spherical black body with radius 12 cm radiates 450 W power at 500 K.If the radius is halved and temperature is doubled, the power radiated in watt would be.
Answer» 112.A spherical black body with radius 12 cm radiates 450 W power at 500 K.If the radius is halved and temperature is doubled, the power radiated in watt would be.

Discussion

3914.	A vessel contains a non-linear triatomic gas.if 50% of gas dissociate into individual atom,then find new value of degree of freedom by ignoring the vibrational mode and any further dissociation.
Answer» A vessel contains a non-linear triatomic gas.if 50% of gas dissociate into individual atom,then find new value of degree of freedom by ignoring the vibrational mode and any further dissociation.

Discussion

3915.	What would happen if the earth were to pass through the tail of a comet?
Answer» What would happen if the earth were to pass through the tail of a comet?

Discussion

3916.	The measurement of mass and volume of a body are 2.00g and 5.0cm^3 respectively, with posible error of 0.01g and 0.1cm^3. What would be the maximum permissible error in its density?
Answer» The measurement of mass and volume of a body are 2.00g and 5.0cm^3 respectively, with posible error of 0.01g and 0.1cm^3. What would be the maximum permissible error in its density?

Discussion

3917.	Question 3(b)State whether the following statement is true or false.A charged glass rod attracts a charged plastic straw.
Answer» Question 3(b) State whether the following statement is true or false. A charged glass rod attracts a charged plastic straw.

3917.

Question 3(b)State whether the following statement is true or false.A charged glass rod attracts a charged plastic straw.

Answer»

Question 3(b)

State whether the following statement is true or false.

A charged glass rod attracts a charged plastic straw.

Discussion

3918.	Draw ray diagrams for the cases of images obtained in concave mirrors as described in the table on page 122.
Answer» Draw ray diagrams for the cases of images obtained in concave mirrors as described in the table on page 122.

Discussion

3919.	x2 +3√3x +6
Answer» ^_x2 +3√3x +6

Discussion

3920.	why charge cannot exist without mass
Answer» why charge cannot exist without mass

Discussion

3921.	in a faulty barometer,due to some air present above mercury in a volume of 20cm^3,the reading is 50cm.when the barometer tube is immersed so much in mercury that the volume of air in the tube above mercury is reduced to 5cm^3,then barometer reads 30cm.what is the correct pressure of the atmosphere.
Answer» in a faulty barometer,due to some air present above mercury in a volume of 20cm^3,the reading is 50cm.when the barometer tube is immersed so much in mercury that the volume of air in the tube above mercury is reduced to 5cm^3,then barometer reads 30cm.what is the correct pressure of the atmosphere.

Discussion

3922.	The velocity-time graph of a particle is shown below. What is the acceleration of the particle?
Answer» The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

3922.

The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

Answer»

The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

Discussion

3923.	What is the difference between vector quantity and scalar quantity explain by giving examples
Answer» What is the difference between vector quantity and scalar quantity explain by giving examples

Discussion

3924.	What makes things visible to us? Why cannot we see a book which is placed (a) behind a wooden screen and (b) in a dark room?
Answer» What makes things visible to us? Why cannot we see a book which is placed (a) behind a wooden screen and (b) in a dark room?

Discussion

3925.	Calculate the area of the shape (in sq.units) given in the following figure. 45
Answer» Calculate the area of the shape (in $sq.units$ ) given in the following figure. 45

3925.

Calculate the area of the shape (in sq.units) given in the following figure. 45

Answer» Calculate the area of the shape (in

sq.units

) given in the following figure.

45

Discussion

3926.	Write four irrational number between0.1 and 0.2
Answer» Write four irrational number between0.1 and 0.2

Discussion

3927.	Newton's first law of motion can also be referred to as
Answer» Newton's first law of motion can also be referred to as

Discussion

3928.	Look at the figure given below: Without which of the following forces listed below, the person would not be able to climb the wall?
Answer» Look at the figure given below: Without which of the following forces listed below, the person would not be able to climb the wall?

Discussion

3929.	What is transfer of charges and give 2examples in our daily lives?
Answer» What is transfer of charges and give 2examples in our daily lives?

Discussion

3930.	What is a) Pseudo Force b) Conservative Force c)\:Non Conservative Force d) Dissipative Force e) Inertial Frame of Reference f) Non- Inertial Frame of Reference
Answer» What is a) Pseudo Force b) Conservative Force c)\:Non Conservative Force d) Dissipative Force e) Inertial Frame of Reference f) Non- Inertial Frame of Reference

Discussion

3931.	A metal cube of 5 cm edge is melted and cast into a cuboid whose base is 2.5 cm × 0.5 cm. Then the height of the cuboid will be ___.
Answer» A metal cube of 5 cm edge is melted and cast into a cuboid whose base is 2.5 cm $\times$ 0.5 cm. Then the height of the cuboid will be ___.

Discussion

3932.	(a) What is sublimation? Name two substance (other than ammonium chloride) which undergo sublimation.(b) Draw a labelled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.
Answer» (a) What is sublimation? Name two substance (other than ammonium chloride) which undergo sublimation. (b) Draw a labelled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.

Discussion

3933.	27. Estimate the no of electrons in 100g of water. how much is the total negative charge on these electrons.
Answer» 27. Estimate the no of electrons in 100g of water. how much is the total negative charge on these electrons.

Discussion

3934.	124.Two point charges of +3 micro C and -3 microC are placed 2 x 10 power -3 m apart from each other. .Calculate electric field and electric potential at a distance of 0.6 m from the dipole in broad side on position. What is 'broad side on position' and 'end-on position' in case of an electric dipole ? How do we calculate in this ?
Answer» 124.Two point charges of +3 micro C and -3 microC are placed 2 x 10 power -3 m apart from each other. .Calculate electric field and electric potential at a distance of 0.6 m from the dipole in broad side on position. What is 'broad side on position' and 'end-on position' in case of an electric dipole ? How do we calculate in this ?

Discussion

3935.	4 kg is equal to how much in grams ?
Answer» 4 kg is equal to how much in grams ?

Discussion

3936.	{ (1) The length of the bridge, which a train }130m long and }}{ travelling at }45km/hr can cross in }30s, is }}{ (a) }200m (b) }225m (c) }245m (d) }250m
Answer» { (1) The length of the bridge, which a train }130m long and }}{ travelling at }45km/hr can cross in }30s, is }}{ (a) }200m (b) }225m (c) }245m (d) }250m

Discussion

3937.	Five balls A, B, C, D and E are used in an experiment and following observations have been made :(1) Ball A repels C and attracts B.(2) Ball D attracts B and has no effect on E(3) A negatively charged rod attracts both A and E.Based on above information, select the correct charge configuration for balls (if any):ABCDE(P)+−+0+(Q)+−++0(R)+−+00(S)−−−00
Answer» Five balls $A, B, C, D$ and $E$ are used in an experiment and following observations have been made : $(1)$ Ball $A$ repels $C$ and attracts $B$ . $(2)$ Ball $D$ attracts $B$ and has no effect on $E$ $(3)$ A negatively charged rod attracts both $A$ and $E$ . Based on above information, select the correct charge configuration for balls (if any): $\begin{matrix} A & B & C & D & E (P) & + & - & + & 0 & + (Q) & + & - & + & + & 0 (R) & + & - & + & 0 & 0 (S) & - & - & - & 0 & 0 \end{matrix}$

Discussion

3938.	A. Define instantaneous and average velocity.B. A car travelled a distance of 40 km in first hour and it travelled at a velocity of 30 km/h for next two hours. Calculate its average velocity.
Answer» A. Define instantaneous and average velocity. B. A car travelled a distance of 40 km in first hour and it travelled at a velocity of 30 km/h for next two hours. Calculate its average velocity.

Discussion

3939.	The area of cross section of press plunger of hydraulic press is 4m2. It is required to overcome a resistive load of 400N on it.If the area of cross section of pump plunger is 0.01m2 then force required on pump plunger is
Answer» The area of cross section of press plunger of hydraulic press is 4 $m^{2}$ . It is required to overcome a resistive load of 400N on it.If the area of cross section of pump plunger is 0.01 $m^{2}$ then force required on pump plunger is

Discussion

3940.	The point vertically above the focus of an earthquake is:
Answer» The point vertically above the focus of an earthquake is:

Discussion

3941.	If the boiling point of water is 95^°F , what will be the reduction at Celcius scale?
Answer» If the boiling point of water is 95^°F , what will be the reduction at Celcius scale?

Discussion

3942.	Two identical waves, each of frequency 10 Hz, are travelling in opposite directions in a medium with a speed of 20 cm/s. The distance between adjacent nodes is :
Answer» Two identical waves, each of frequency 10 Hz, are travelling in opposite directions in a medium with a speed of 20 cm/s. The distance between adjacent nodes is :

Discussion

3943.	Class B fire is caused due to:
Answer» Class B fire is caused due to:

Discussion

3944.	Which of the following words will create a readable sequence of letters upon reflection in a plane mirror?
Answer» Which of the following words will create a readable sequence of letters upon reflection in a plane mirror?

Discussion

3945.	Question 2Define the following terms:(i) Melting(ii) Boiling(iii) Boiling point(iv) Condensation
Answer» Question 2 Define the following terms: (i) Melting (ii) Boiling (iii) Boiling point (iv) Condensation

3945.

Question 2Define the following terms:(i) Melting(ii) Boiling(iii) Boiling point(iv) Condensation

Answer»

Question 2

Define the following terms:

(i) Melting

(ii) Boiling

(iii) Boiling point

(iv) Condensation

Discussion

3946.	Solve the following examples.a.What must be the temperature in Fahrenheit so that it will be twice its value in Celsius?b. A bridge is made from 20 m long iron rods. At temperature 18∘C, the distance between two rods in 0.4 cm. Up to what temperature will the bridge be in good shape?c. At 15∘C the height of Eifel tower is 324 m. If it is made of iron, what will be the increase in length in cm, at 30∘C?d. Two substances A and B have specific heats c and 2 c respectively. If A and B are given Q and 4Q amounts of heat respectively, the change in their temperatures is the same. If the mass of A is m, what is the mass of B?e. When a substance having mass 3 kg receives 600 cal of heat, its temperature increases by 10∘C. What is the specific heat of the substance?
Answer» Solve the following examples. a.What must be the temperature in Fahrenheit so that it will be twice its value in Celsius? b. A bridge is made from 20 m long iron rods. At temperature 18^∘C, the distance between two rods in 0.4 cm. Up to what temperature will the bridge be in good shape? c. At 15^∘C the height of Eifel tower is 324 m. If it is made of iron, what will be the increase in length in cm, at 30^∘C? d. Two substances A and B have specific heats c and 2 c respectively. If A and B are given Q and 4Q amounts of heat respectively, the change in their temperatures is the same. If the mass of A is m, what is the mass of B? e. When a substance having mass 3 kg receives 600 cal of heat, its temperature increases by 10^∘C. What is the specific heat of the substance?

Discussion

3947.	describe the structure of human eye and functions of its various parts.
Answer» describe the structure of human eye and functions of its various parts.

Discussion

3948.	A massless inextensible strting in the form of a loop is placed on a horizontal film of soap solution of surface tension T. If film is pierced inside the loop and it convert into a circular loop of diameter d, then the tension produced in string is?
Answer» A massless inextensible strting in the form of a loop is placed on a horizontal film of soap solution of surface tension T. If film is pierced inside the loop and it convert into a circular loop of diameter d, then the tension produced in string is?

Discussion

3949.	53. Why positive chage repel each other.
Answer» 53. Why positive chage repel each other.

Discussion

3950.	Choose the ray diagram which shows the image formation for the given object.
Answer» Choose the ray diagram which shows the image formation for the given object.

Discussion

Explore topic-wise InterviewSolutions in .

Sushweta has to send a laser signal to Garima. But she finds out that the signal misses Garima by 40. She asks Himanshu to rotate the mirror. By what angle should Himanshu rotate the mirror so that the signal reaches to Garima?

Can a force act on an object even when it is not in contact with the object? Give examples.

A body of density rho is dropped from rest from a height h into a lake of density Sigma ,Sigma is greater than rho neglecting all dissipative forces the maximum depth to which the body sinks before returning to float on surface

Mention any 3 items that one should carry while visiting a snowy mountains.

A bullet is fired from a gun. The force on the bullet is given by F = 600 - 2105 t, where F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel. What is the impulse imparted to the bullet.

What is the electrical potential difference?

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic proces

ntn ntn nt charge Q1andQ2 lie inside and outside a closed surface s. let E is field at any point on S and phi is fiux of e over s which is wrong?n nta.if Q1 changes both E, phi will changen ntb.if Q1 not equal to 0and Q2 equal to 0 then E=o but phi not equal to 0n

A wave sound produces 10 oscilllations in 100 m s.Find the time period of he wave

State whether the following statements are true or false : (a) Rainwater is a non-conductor of electricity. (b) A piece of fresh potato does not conduct electricity at all.

It is given that A = B^2. If A = 100 +- 0.20, then B is equal to (1.) 10 +- 0.20(2.) 10 +- 0.02(3.) 10 +- 0.01(4.) 10 +- 0.1

112.A spherical black body with radius 12 cm radiates 450 W power at 500 K.If the radius is halved and temperature is doubled, the power radiated in watt would be.

A vessel contains a non-linear triatomic gas.if 50% of gas dissociate into individual atom,then find new value of degree of freedom by ignoring the vibrational mode and any further dissociation.

What would happen if the earth were to pass through the tail of a comet?

The measurement of mass and volume of a body are 2.00g and 5.0cm^3 respectively, with posible error of 0.01g and 0.1cm^3. What would be the maximum permissible error in its density?

Question 3(b)State whether the following statement is true or false.A charged glass rod attracts a charged plastic straw.

Draw ray diagrams for the cases of images obtained in concave mirrors as described in the table on page 122.

x​​​2 +3√3x +6

why charge cannot exist without mass

in a faulty barometer,due to some air present above mercury in a volume of 20cm^3,the reading is 50cm.when the barometer tube is immersed so much in mercury that the volume of air in the tube above mercury is reduced to 5cm^3,then barometer reads 30cm.what is the correct pressure of the atmosphere.

The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

What is the difference between vector quantity and scalar quantity explain by giving examples

What makes things visible to us? Why cannot we see a book which is placed (a) behind a wooden screen and (b) in a dark room?

Calculate the area of the shape (in sq.units) given in the following figure. 45

Write four irrational number between0.1 and 0.2

Newton's first law of motion can also be referred to as

Look at the figure given below: Without which of the following forces listed below, the person would not be able to climb the wall?

What is transfer of charges and give 2examples in our daily lives?

What is a) Pseudo Force b) Conservative Force c)\:Non Conservative Force d) Dissipative Force e) Inertial Frame of Reference f) Non- Inertial Frame of Reference

A metal cube of 5 cm edge is melted and cast into a cuboid whose base is 2.5 cm × 0.5 cm. Then the height of the cuboid will be ___.

(a) What is sublimation? Name two substance (other than ammonium chloride) which undergo sublimation.(b) Draw a labelled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.

27. Estimate the no of electrons in 100g of water. how much is the total negative charge on these electrons.

4 kg is equal to how much in grams ?

{ (1) The length of the bridge, which a train }130m long and }}{ travelling at }45km/hr can cross in }30s, is }}{ (a) }200m (b) }225m (c) }245m (d) }250m

A. Define instantaneous and average velocity.B. A car travelled a distance of 40 km in first hour and it travelled at a velocity of 30 km/h for next two hours. Calculate its average velocity.

The area of cross section of press plunger of hydraulic press is 4m2. It is required to overcome a resistive load of 400N on it.If the area of cross section of pump plunger is 0.01m2 then force required on pump plunger is

The point vertically above the focus of an earthquake is:

If the boiling point of water is 95^°F , what will be the reduction at Celcius scale?

Two identical waves, each of frequency 10 Hz, are travelling in opposite directions in a medium with a speed of 20 cm/s. The distance between adjacent nodes is :

Class B fire is caused due to:

Which of the following words will create a readable sequence of letters upon reflection in a plane mirror?

Question 2Define the following terms:(i) Melting(ii) Boiling(iii) Boiling point(iv) Condensation

describe the structure of human eye and functions of its various parts.

A massless inextensible strting in the form of a loop is placed on a horizontal film of soap solution of surface tension T. If film is pierced inside the loop and it convert into a circular loop of diameter d, then the tension produced in string is?

53. Why positive chage repel each other.

Choose the ray diagram which shows the image formation for the given object.

x2 +3√3x +6