9478 + Interview Questions in Physics Page 98 InterviewSolution

4851.	Statement 1: The flow of current in poor conductor is impossible. Statement 2: Under certain conditions current flows in a poor conductor.
Answer» Statement 1: The flow of current in poor conductor is impossible. Statement 2: Under certain conditions current flows in a poor conductor.

Discussion

4852.	Can carbon rod be electroplated with carbon using carbonic acid as an electrolyte?
Answer» Can carbon rod be electroplated with carbon using carbonic acid as an electrolyte?

Discussion

4853.	In a resonance tube experiment when the tube is filled with water up to a height of 17.0 cm from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5 cm. If the velocity of sound in air is 330 m/s, the tuning fork frequency is
Answer» In a resonance tube experiment when the tube is filled with water up to a height of $17.0 cm$ from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of $24.5 cm$ . If the velocity of sound in air is $330 m/s$ , the tuning fork frequency is

Discussion

4854.	Simple sentences.... Advantages and disadvantages of friction.... Easily ......
Answer» Simple sentences.... Advantages and disadvantages of friction.... Easily ......

4854.

Simple sentences.... Advantages and disadvantages of friction.... Easily ......

Answer»

Simple sentences....

Advantages and disadvantages of friction....

Easily ......

Discussion

4855.	Explain the stepwise procedure that needs to be followed to measure the body temperature using a clinical thermometer?
Answer» Explain the stepwise procedure that needs to be followed to measure the body temperature using a clinical thermometer?

Discussion

4856.	why the gravitational force between two bodies is not affected by surrounding bodies?
Answer» why the gravitational force between two bodies is not affected by surrounding bodies?

Discussion

4857.	Question 22When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly. Explain the reason.
Answer» Question 22 When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly. Explain the reason.

Discussion

4858.	What is the SI unit of wavelength?
Answer» What is the SI unit of wavelength?

Discussion

4859.	Which of the following methods will help in reducing air drag?
Answer» Which of the following methods will help in reducing air drag?

Discussion

4860.	A balloon inflates when air is pumped into it. What conclusion can be derived out of this observation?
Answer» A balloon inflates when air is pumped into it. What conclusion can be derived out of this observation?

Discussion

4861.	Of the various types of friction, which has the maximum value between two surfaces in contact?
Answer» Of the various types of friction, which has the maximum value between two surfaces in contact?

Discussion

4862.	LEDs (Light Emitting Diodes) are available in many colours such as red, green, yellow, blue and white and are increasingly being used for many applications, for example in traffic signal lights. But in everyday life we use CFLs and are currently the best choice because
Answer» LEDs (Light Emitting Diodes) are available in many colours such as red, green, yellow, blue and white and are increasingly being used for many applications, for example in traffic signal lights. But in everyday life we use CFLs and are currently the best choice because

Discussion

4863.	What does the word ‘plunge’ mean in context of the passage?
Answer» What does the word ‘plunge’ mean in context of the passage?

Discussion

4864.	• Have you heard the sound of rainfall?• What sound does the rain make on umbrellas?• What sound does the rain make on the leaves of the trees?• What sound does the rain make on your window? Make all these sounds yourself.
Answer» • Have you heard the sound of rainfall? • What sound does the rain make on umbrellas? • What sound does the rain make on the leaves of the trees? • What sound does the rain make on your window? Make all these sounds yourself.

Discussion

4865.	State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
Answer» State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.

Discussion

4866.	Surface tension of a soap solution is T. There is a soap bubble of radius r. Calculate the amount of charge that must be spread uniformly on its surface so that its radius becomes 2r. Atmospheric pressure is P. Assume that air temperature inside the bubble remains constant.
Answer» Surface tension of a soap solution is T. There is a soap bubble of radius r. Calculate the amount of charge that must be spread uniformly on its surface so that its radius becomes 2r. Atmospheric pressure is P. Assume that air temperature inside the bubble remains constant.

Discussion

4867.	The average kinetic energy of hydrogen molecules at 300 K is E. At the same temperature, the average kinetic energy of oxygen molecules will be
Answer» The average kinetic energy of hydrogen molecules at $300 K$ is $E$ . At the same temperature, the average kinetic energy of oxygen molecules will be

Discussion

4868.	Lubricants are used to
Answer» Lubricants are used to

Discussion

4869.	A rectangular water tank of base 12m×10m contains water upto a height of 4 m. If the water in the tank is transferred to a square tank of side 8m, find the height of the water level in the tank. (in m)
Answer» A rectangular water tank of base $12 m \times 10 m$ contains water upto a height of 4 m. If the water in the tank is transferred to a square tank of side 8m, find the height of the water level in the tank. (in m)

Discussion

4870.	The linear density of a thin rod of length 1.0 m varies as where x is the distance from its one end. The distance of its centre of mass from its end is
Answer» The linear density of a thin rod of length 1.0 m varies as where x is the distance from its one end. The distance of its centre of mass from its end is

Discussion

4871.	2 thermally insulated vessels 1 and 2 are filled with air at temepraturesT1,T2,volume V1,V2 and pressure p1,p2 respectively.if the valve joining the vesselsis opened ,the temperature inside the vessel at equilibrium will be ?
Answer» 2 thermally insulated vessels 1 and 2 are filled with air at temepraturesT1,T2,volume V1,V2 and pressure p1,p2 respectively.if the valve joining the vesselsis opened ,the temperature inside the vessel at equilibrium will be ?

Discussion

4872.	Explain the outer ear, middle ear and the inner ear briefly
Answer» Explain the outer ear, middle ear and the inner ear briefly

Discussion

4873.	Question 23 Observing that the bulb does not glow in the circuit shown in Fig 1, Boojho changed the circuit as shown in Fig 2. He observed deflection in the magnetic compass. (i) What does the deflection of magnetic compass indicate? (ii) Why did the bulb not glow in Fig. 1? (iii) What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in Fig. 2? (iv) What will be observed if the number of cells is increased in the circuit shown in Fig. 2?
Answer» Question 23 Observing that the bulb does not glow in the circuit shown in Fig 1, Boojho changed the circuit as shown in Fig 2. He observed deflection in the magnetic compass. (i) What does the deflection of magnetic compass indicate? (ii) Why did the bulb not glow in Fig. 1? (iii) What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in Fig. 2? (iv) What will be observed if the number of cells is increased in the circuit shown in Fig. 2?

Discussion

4874.	A car moving at a speed of 36 km/hr is taking a turn ona circular road of radius 50 m. A small wooden plate iskept on the seat with its plane perpendicular to theradius of the circular road (figure 7-E4). A small blockof mass 100 g is kept on the seat which rests againstthe plate. The friction coefficient between the block andthe plate is u = 0-58. (a) Find the normal contact forceexerted by the plate on the block.(b The plate is slowlyturned so that the angle between the normal to the plateand the radius of the road slowly increases. Find theangle at which the block will just start sliding on theplate. Ri
Answer» A car moving at a speed of 36 km/hr is taking a turn ona circular road of radius 50 m. A small wooden plate iskept on the seat with its plane perpendicular to theradius of the circular road (figure 7-E4). A small blockof mass 100 g is kept on the seat which rests againstthe plate. The friction coefficient between the block andthe plate is u = 0-58. (a) Find the normal contact forceexerted by the plate on the block.(b The plate is slowlyturned so that the angle between the normal to the plateand the radius of the road slowly increases. Find theangle at which the block will just start sliding on theplate. Ri

Discussion

4875.	A block of iron sinks in fluid A but floats in another fluid B. What does this tell us about the densities of the fluids?
Answer» A block of iron sinks in fluid A but floats in another fluid B. What does this tell us about the densities of the fluids?

Discussion

4876.	Arrange the following in the correct order of second ionisation energy: Ne, O, Na, F, N
Answer» Arrange the following in the correct order of second ionisation energy: Ne, O, Na, F, N

Discussion

4877.	Which of the following is a lubricant?
Answer» Which of the following is a lubricant?

Discussion

4878.	The motion of a particle ofmass m is described by y=ut+1/2gt^2. Find the force acting on the particle.
Answer» The motion of a particle ofmass m is described by y=ut+1/2gt^2. Find the force acting on the particle.

Discussion

4879.	A plastic ball is taken to the bottom of a pond and released.It rises up and jumps off the water surface.Draw the position -time graph for its motion and justify the graph.Assume all accelerations as constant .
Answer» A plastic ball is taken to the bottom of a pond and released.It rises up and jumps off the water surface.Draw the position -time graph for its motion and justify the graph.Assume all accelerations as constant .

Discussion

4880.	4 point charge of magnitude Q are kept on corners of a square of side L A point charge -q and mass m is released from height y (height from centre of square) find time period of ossilation of moving charge (y
Answer» 4 point charge of magnitude Q are kept on corners of a square of side L A point charge -q and mass m is released from height y (height from centre of square) find time period of ossilation of moving charge (y<<<

Discussion

4881.	An electric iron of power 1.5 kW is used for 30 minute.to press the clothes Calculate the electrical energy consumed in (a) kilowatt hour (b) joule.
Answer» An electric iron of power 1.5 kW is used for 30 minute.to press the clothes Calculate the electrical energy consumed in (a) kilowatt hour (b) joule.

Discussion

4882.	Write the value of 5(81/3+271/3)31/4.
Answer» Write the value of ${\{5 (8^{1 / 3} + 27^{1 / 3})^{3}\}}^{1 / 4} .$

Discussion

4883.	What is a contact force? Give some examples of it and explain why they are contact forces? [3 MARKS]
Answer» What is a contact force? Give some examples of it and explain why they are contact forces? [3 MARKS]

Discussion

4884.	A wave transports energy and not matter justify the statement
Answer» A wave transports energy and not matter justify the statement

Discussion

4885.	A rectangular block of mass 300 kg is placed on the ground. Area of contact is 1.5 m2. Calculate the pressure exerted by the block. (Take accelaration due to gravity =10 m/s2).
Answer» A rectangular block of mass $300 k g$ is placed on the ground. Area of contact is $1.5 m^{2}$ . Calculate the pressure exerted by the block. (Take accelaration due to gravity $= 10 m / s^{2}$ ).

Discussion

4886.	What is notes? What is pitch?
Answer» What is notes? What is pitch?

4886.

What is notes? What is pitch?

Answer»

What is notes?

What is pitch?

Discussion

4887.	The current density across a cylinderical conductor of radius R varies in magnitude according to the equation J=J0 {1-(r/R)} where r is the distance from the central axis. Thus , the current density is maximum J0 at the axis (r=0)and decreases linearly to zero at the surface (r=R). The current in terms of J0 and conductor's cross -sectional area A is :-(1){(J0)A/3}(2){(J0)A/6}(3){(J0)A/2}(4){(J0)A/5
Answer» The current density across a cylinderical conductor of radius R varies in magnitude according to the equation J=J0 {1-(r/R)} where r is the distance from the central axis. Thus , the current density is maximum J0 at the axis (r=0)and decreases linearly to zero at the surface (r=R). The current in terms of J0 and conductor's cross -sectional area A is :- (1){(J0)A/3} (2){(J0)A/6} (3){(J0)A/2} (4){(J0)A/5

Discussion

4888.	_______ mirrors are used in headlights of car.
Answer» _______ mirrors are used in headlights of car.

Discussion

4889.	46 The work done in an open vessel at 300k, when 56g iron reacts with dilute HCl is
Answer» 46 The work done in an open vessel at 300k, when 56g iron reacts with dilute HCl is

Discussion

4890.	Which of the following is not a property of magnets?
Answer» Which of the following is not a property of magnets?

Discussion

4891.	If the speed of light is equal to 3×108ms−1, how many kilometers will make up 1 light year?
Answer» If the speed of light is equal to $3 \times 10^{8} m s^{- 1}$ , how many kilometers will make up 1 light year?

Discussion

4892.	If f((x^3)+1) = (x^4)+1 then find f(x)
Answer» If f((x^3)+1) = (x^4)+1 then find f(x)

Discussion

4893.	Question 17.3 Can Boojho at C see the image of A reflected from the mirror?
Answer» Question 17.3 Can Boojho at C see the image of A reflected from the mirror?

Discussion

4894.	One cubic cm of iron weights 7.8 grams.write as sequences, the volumes of weights of iron cubes of sides 1 cm,2 cm and so on what will be the answer?
Answer» One cubic cm of iron weights 7.8 grams.write as sequences, the volumes of weights of iron cubes of sides 1 cm,2 cm and so on what will be the answer?

Discussion

4895.	30. 1 milli mole NH3=_______gm NH3?
Answer» 30. 1 milli mole NH3=_______gm NH3?

Discussion

4896.	If there is a positive error of 50% in the measurement of velocity of a body, then the error in the measurement of kinetic energy is??
Answer» If there is a positive error of 50% in the measurement of velocity of a body, then the error in the measurement of kinetic energy is??

Discussion

4897.	A light cylindrical vessel is kept on a horizontal surface.Its base area is A. A hole of cross-sectional area a is made just at its bottom side. The Minimum coefficient of friction necessary for sliding of the vessel due to the impact force of the emerging liquid is(a
Answer» A light cylindrical vessel is kept on a horizontal surface.Its base area is A. A hole of cross-sectional area a is made just at its bottom side. The Minimum coefficient of friction necessary for sliding of the vessel due to the impact force of the emerging liquid is(a<

Discussion

4898.	What is kinetic energy?
Answer» What is kinetic energy?

Discussion

4899.	An infinite number of charges, each of q coulomb, are placed along x- axis at x=1m, 3m, 9m and so on. Calculate the electric field at the point x=0, due to these charges if all the charges are of the same sign?
Answer» An infinite number of charges, each of q coulomb, are placed along x- axis at x=1m, 3m, 9m and so on. Calculate the electric field at the point x=0, due to these charges if all the charges are of the same sign?

Discussion

4900.	Which of the following liquids conduct electricity and which do not conduct electricity? Lemon juice, Milk, Vinegar, Common salt solution, Sulphuric acid solution, Sugar solution, Distilled water, Honey, Sea water, Rainwater.
Answer» Which of the following liquids conduct electricity and which do not conduct electricity? Lemon juice, Milk, Vinegar, Common salt solution, Sulphuric acid solution, Sugar solution, Distilled water, Honey, Sea water, Rainwater.

Discussion

Explore topic-wise InterviewSolutions in .

Statement 1: The flow of current in poor conductor is impossible. Statement 2: Under certain conditions current flows in a poor conductor.

Can carbon rod be electroplated with carbon using carbonic acid as an electrolyte?

Simple sentences.... Advantages and disadvantages of friction.... Easily ......

Explain the stepwise procedure that needs to be followed to measure the body temperature using a clinical thermometer?

why the gravitational force between two bodies is not affected by surrounding bodies?

Question 22When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly. Explain the reason.

What is the SI unit of wavelength?

Which of the following methods will help in reducing air drag?

A balloon inflates when air is pumped into it. What conclusion can be derived out of this observation?

Of the various types of friction, which has the maximum value between two surfaces in contact?

LEDs (Light Emitting Diodes) are available in many colours such as red, green, yellow, blue and white and are increasingly being used for many applications, for example in traffic signal lights. But in everyday life we use CFLs and are currently the best choice because

What does the word ‘plunge’ mean in context of the passage?

• Have you heard the sound of rainfall?• What sound does the rain make on umbrellas?• What sound does the rain make on the leaves of the trees?• What sound does the rain make on your window? Make all these sounds yourself.

State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.

Surface tension of a soap solution is T. There is a soap bubble of radius r. Calculate the amount of charge that must be spread uniformly on its surface so that its radius becomes 2r. Atmospheric pressure is P. Assume that air temperature inside the bubble remains constant.

The average kinetic energy of hydrogen molecules at 300 K is E. At the same temperature, the average kinetic energy of oxygen molecules will be

Lubricants are used to

A rectangular water tank of base 12m×10m contains water upto a height of 4 m. If the water in the tank is transferred to a square tank of side 8m, find the height of the water level in the tank. (in m)

The linear density of a thin rod of length 1.0 m varies as where x is the distance from its one end. The distance of its centre of mass from its end is

2 thermally insulated vessels 1 and 2 are filled with air at temepraturesT1,T2,volume V1,V2 and pressure p1,p2 respectively.if the valve joining the vesselsis opened ,the temperature inside the vessel at equilibrium will be ?

Explain the outer ear, middle ear and the inner ear briefly

A block of iron sinks in fluid A but floats in another fluid B. What does this tell us about the densities of the fluids?

Arrange the following in the correct order of second ionisation energy: Ne, O, Na, F, N

Which of the following is a lubricant?

The motion of a particle ofmass m is described by y=ut+1/2gt^2. Find the force acting on the particle.

A plastic ball is taken to the bottom of a pond and released.It rises up and jumps off the water surface.Draw the position -time graph for its motion and justify the graph.Assume all accelerations as constant .

4 point charge of magnitude Q are kept on corners of a square of side L A point charge -q and mass m is released from height y (height from centre of square) find time period of ossilation of moving charge (y

An electric iron of power 1.5 kW is used for 30 minute.to press the clothes Calculate the electrical energy consumed in (a) kilowatt hour (b) joule.

Write the value of 5(81/3+271/3)31/4.

What is a contact force? Give some examples of it and explain why they are contact forces? [3 MARKS]

A wave transports energy and not matter justify the statement

A rectangular block of mass 300 kg is placed on the ground. Area of contact is 1.5 m2. Calculate the pressure exerted by the block. (Take accelaration due to gravity =10 m/s2).

What is notes? What is pitch?

_______ mirrors are used in headlights of car.

46 The work done in an open vessel at 300k, when 56g iron reacts with dilute HCl is

Which of the following is not a property of magnets?

If the speed of light is equal to 3×108ms−1, how many kilometers will make up 1 light year?

If f((x^3)+1) = (x^4)+1 then find f(x)

Question 17.3 Can Boojho at C see the image of A reflected from the mirror?

One cubic cm of iron weights 7.8 grams.write as sequences, the volumes of weights of iron cubes of sides 1 cm,2 cm and so on what will be the answer?

30. 1 milli mole NH3=_______gm NH3?

If there is a positive error of 50% in the measurement of velocity of a body, then the error in the measurement of kinetic energy is??

A light cylindrical vessel is kept on a horizontal surface.Its base area is A. A hole of cross-sectional area a is made just at its bottom side. The Minimum coefficient of friction necessary for sliding of the vessel due to the impact force of the emerging liquid is(a

What is kinetic energy?

An infinite number of charges, each of q coulomb, are placed along x- axis at x=1m, 3m, 9m and so on. Calculate the electric field at the point x=0, due to these charges if all the charges are of the same sign?

Which of the following liquids conduct electricity and which do not conduct electricity? Lemon juice, Milk, Vinegar, Common salt solution, Sulphuric acid solution, Sugar solution, Distilled water, Honey, Sea water, Rainwater.