16569 + Interview Questions in Physics

1.	30 The wavelength corresponding to maximum spectralradiancy of a black body A is 5000 A.Consider another black body B whose surface areais twice that of A and total radiant energy emittedby B is 16 times that emitted by A. Thewavelength corresponding to maximum spectralradiancy for B will be(1) 5000 β )14A(2) 2500 A(3) 10,000 A(4) 500030
Answer» 30 The wavelength corresponding to maximum spectralradiancy of a black body A is 5000 A.Consider another black body B whose surface areais twice that of A and total radiant energy emittedby B is 16 times that emitted by A. Thewavelength corresponding to maximum spectralradiancy for B will be(1) 5000 β )14A(2) 2500 A(3) 10,000 A(4) 500030

Discussion

2.	In what respect, is a toroid differentfrom a solenoid? Draw and comparethe pattern of the magnetic fieldlines in the two cases.THE
Answer» In what respect, is a toroid differentfrom a solenoid? Draw and comparethe pattern of the magnetic fieldlines in the two cases.THE

Discussion

3.	A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate percent efficiency of the work?
Answer» A cart of weight $10 N$ is pulled $1.2 m$ up a ramp by an applied force of magnitude $5.0 N$ (parallel to the ramp), raising the cart $0.50 m$ above its initial level. Calculate percent efficiency of the work?

Discussion

4.	two point charges repel each other with a force of 100 N.One of the charges is increased by 10% and another is reduced by 10%.the new force of repulsion at same distance is to be
Answer» two point charges repel each other with a force of 100 N.One of the charges is increased by 10% and another is reduced by 10%.the new force of repulsion at same distance is to be

Discussion

5.	Acid rain happens because:
Answer» Acid rain happens because:

Discussion

6.	1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1
Answer» 1 kg of ice at $0^{\circ} C$ is mixed with 1 kg of steam at $100^{\circ} C$ . What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = $3.36 \times 10^{5} J k g^{- 1}$ and latent heat of vaporization of water = $2.26 \times 10^{6} J k g^{- 1}$

Discussion

7.	41.Find teh equivalent of capacitence between A & B if each capacitor of capacity C is connected as shown
Answer» 41.Find teh equivalent of capacitence between A & B if each capacitor of capacity C is connected as shown

Discussion

8.	electron gain enthalpy of F is -328 kJ/mol.ionisation energy of F^{} ion will be (IE_1 of F is +1683 kJ/mol)
Answer» electron gain enthalpy of F is -328 kJ/mol.ionisation energy of F^{} ion will be (IE_1 of F is +1683 kJ/mol)

Discussion

9.	51.for an angle of incidence of 45^° for a ray ,moving from glass to water ,what is the maximum refractive index of glass for total internal reflection ?( for water=4/3)
Answer» 51.for an angle of incidence of 45^° for a ray ,moving from glass to water ,what is the maximum refractive index of glass for total internal reflection ?( for water=4/3)

Discussion

10.	300 g of coconut oil at 50∘C is mixed with 500 g kerosene at 10∘C. Determine the temperature of the mixture. (Specific heat of coconut oil = 2100 J kg−1 K−1 and specific heat of kerosene = 2000 J kg−1 K−1.
Answer» $300 g$ of coconut oil at $50^{\circ} C$ is mixed with $500 g$ kerosene at $10^{\circ} C$ . Determine the temperature of the mixture. (Specific heat of coconut oil = $2100 J k g^{- 1} K^{- 1}$ and specific heat of kerosene = $2000 J k g^{- 1} K^{- 1}$ .

Discussion

11.	A cook uses a fire tong of length 28 cm to lift a piece of burning coal of mass 250 g. If he applies his effort at a distance of 7 cm from the fulcrum, then the effort required in SI units will be? Take g= 10 m s-2. Thala for a reasonDhoniMahendra Singh dhoniMSD
Answer» A cook uses a fire tong of length 28 cm to lift a piece of burning coal of mass 250 g. If he applies his effort at a distance of 7 cm from the fulcrum, then the effort required in SI units will be? Take g= 10 m s^-2. Thala for a reason Dhoni Mahendra Singh dhoni MSD

11.

A cook uses a fire tong of length 28 cm to lift a piece of burning coal of mass 250 g. If he applies his effort at a distance of 7 cm from the fulcrum, then the effort required in SI units will be? Take g= 10 m s-2. Thala for a reasonDhoniMahendra Singh dhoniMSD

Answer»

A cook uses a fire tong of length 28 cm to lift a piece of burning coal of mass 250 g. If he applies his effort at a distance of 7 cm from the fulcrum, then the effort required in SI units will be? Take g= 10 m s^-2.

Thala for a reason

Dhoni

Mahendra Singh dhoni

MSD

Discussion

12.	why is the angle of deviation maximum for grazing incidence in a prism
Answer» why is the angle of deviation maximum for grazing incidence in a prism

Discussion

13.	In a neutral sphere 5×10^{21 }electrons are present . If 10 % electrons are removed , then calculate the charge on the sphere?
Answer» In a neutral sphere 5×10^{21 }electrons are present . If 10 % electrons are removed , then calculate the charge on the sphere?

Discussion

14.	Which of the following is/are the characteristics of a fuse wire?
Answer» Which of the following is/are the characteristics of a fuse wire?

14.

Which of the following is/are the characteristics of a fuse wire?

Answer»

Which of the following is/are the characteristics of a fuse wire?

Discussion

15.	(a) Which of the following quantity determines the loudness of a sound wave ? (i) wavelength, (ii) frequency, and (c) amplitude. (b) How is loudness related to the quantity mentioned above in part (a) ?
Answer» (a) Which of the following quantity determines the loudness of a sound wave ? (i) wavelength, (ii) frequency, and (c) amplitude. (b) How is loudness related to the quantity mentioned above in part (a) ?

15.

(a) Which of the following quantity determines the loudness of a sound wave ? (i) wavelength, (ii) frequency, and (c) amplitude. (b) How is loudness related to the quantity mentioned above in part (a) ?

Answer»

(a) Which of the following quantity determines the loudness of a sound wave ?

(i) wavelength, (ii) frequency, and (c) amplitude.

(b) How is loudness related to the quantity mentioned above in part (a) ?

Discussion

16.	Focal length of concave lens shown in figure is 60 cm. For an object placed at ′c′ on principal axis, find image position and its size.
Answer» Focal length of concave lens shown in figure is $60 cm$ . For an object placed at $^{'} c^{'}$ on principal axis, find image position and its size.

Discussion

17.	Which one of the following sets of phenomena would increase on raising the temperature?
Answer» Which one of the following sets of phenomena would increase on raising the temperature?

Discussion

18.	A resonance tube is old and has jagged end .It is still used in the lab to determine velocity of sound in air.A tuning fork of frequency 512Hz produces first resonance when the tube is filled with water to a mark 11cm below a reference mark near the open end of tube.The experimts repeated with another fork of frequency 256 Hz which producez first resonance when water reaches a mark of 27 cm below the reference mark .Find the velocity of sound in air obtained in experiment
Answer» A resonance tube is old and has jagged end .It is still used in the lab to determine velocity of sound in air.A tuning fork of frequency 512Hz produces first resonance when the tube is filled with water to a mark 11cm below a reference mark near the open end of tube.The experimts repeated with another fork of frequency 256 Hz which producez first resonance when water reaches a mark of 27 cm below the reference mark .Find the velocity of sound in air obtained in experiment

Discussion

19.	The refractive index of glass is 1.5. From a point P inside a glass slab, draw three rays PA, PB and PC incident on the glass-air surface making angles of incidence 30∘, 42∘ and 60∘ respectively.(a) In the diagram show the approximate direction of these rays as they emerge out of the slab.(b) What is the angle of refraction for the ray PB.Hint: sin(42∘)=2/3
Answer» The refractive index of glass is $1.5$ . From a point P inside a glass slab, draw three rays PA, PB and PC incident on the glass-air surface making angles of incidence $30^{\circ}$ , $42^{\circ}$ and $60^{\circ}$ respectively. (a) In the diagram show the approximate direction of these rays as they emerge out of the slab. (b) What is the angle of refraction for the ray PB. Hint: $sin (42^{\circ}) = 2 / 3$

Discussion

20.	On what factors does the internal resistance of a cell depend? [2 MARKS]
Answer» On what factors does the internal resistance of a cell depend? [2 MARKS]

Discussion

21.	Temperature coefficient of resistance to a wire is 0.00125 per degree Celsius. At 300 degree Celsius, resistance is 1 ohm .what is temperature when resistance is 2 Ohm?
Answer» Temperature coefficient of resistance to a wire is 0.00125 per degree Celsius. At 300 degree Celsius, resistance is 1 ohm .what is temperature when resistance is 2 Ohm?

Discussion

22.	A frame CDEF is placed in a region where a magnetic field B is present. A rod of length 1 metre moves with constant velocity 20m/s and strength of magnetic field is 1 T. The power spent in the process is ( take R=0.2 ohm all othet wires and rod have 0 resistance.)
Answer» A frame CDEF is placed in a region where a magnetic field B is present. A rod of length 1 metre moves with constant velocity 20m/s and strength of magnetic field is 1 T. The power spent in the process is ( take R=0.2 ohm all othet wires and rod have 0 resistance.)

Discussion

23.	6, A parabolic section of wire OA is located in xy plane and carries a current of 12A. A uniform magnetic field of 4T making an angle 60^° with x-axis exists in xy plane. Calculate the magnetic force (in N) on wire O
Answer» 6, A parabolic section of wire OA is located in xy plane and carries a current of 12A. A uniform magnetic field of 4T making an angle 60^° with x-axis exists in xy plane. Calculate the magnetic force (in N) on wire O

Discussion

24.	An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:
Answer» An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

Discussion

25.	Heat is a path function while Heat at cons†an t volume is a state function.why
Answer» Heat is a path function while Heat at cons†an t volume is a state function.why

Discussion

26.	When electricity is passed through a solution ofAICI 13.5 g of Al is deposited. The number offaradays must be
Answer» When electricity is passed through a solution ofAICI 13.5 g of Al is deposited. The number offaradays must be

Discussion

27.	Question 12When light rays enter the eye, most of the refraction occurs at the(a) crystalline lens(b) outer surface of the cornea(c) iris(d) pupil
Answer» Question 12 When light rays enter the eye, most of the refraction occurs at the (a) crystalline lens (b) outer surface of the cornea (c) iris (d) pupil

Discussion

28.	A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered (a) the least, (b) the most.
Answer» A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered (a) the least, (b) the most.

Discussion

29.	A wire loop is formed by joining two semi-circular wires of radii R1 and R2 carrying current I as shown in the given diagram. The magnitude of net magnetic field at the centre O is
Answer» A wire loop is formed by joining two semi-circular wires of radii $R_{1} a n d R_{2}$ carrying current I as shown in the given diagram. The magnitude of net magnetic field at the centre O is

Discussion

30.	Now that you have read the poem in detail, we can begin to ask what the poem might mean. Here are two suggestions. Can you think of others?(i) Does the poem present a conflict between man and nature? Compare it with A Tiger in the Zoo. Is the poet suggesting that plants and trees, used for ‘interior decoration’ in cities while forests are cut down, are ‘imprisoned’, and need to‘break out’?(ii) On the other hand, Adrienne Rich has been known to use trees as a metaphor for human beings: this is a recurrent image in her poetry.What new meanings emerge from the poem if you take its trees to be symbolic of this particular meaning?
Answer» Now that you have read the poem in detail, we can begin to ask what the poem might mean. Here are two suggestions. Can you think of others? (i) Does the poem present a conflict between man and nature? Compare it with A Tiger in the Zoo. Is the poet suggesting that plants and trees, used for ‘interior decoration’ in cities while forests are cut down, are ‘imprisoned’, and need to‘break out’? (ii) On the other hand, Adrienne Rich has been known to use trees as a metaphor for human beings: this is a recurrent image in her poetry.What new meanings emerge from the poem if you take its trees to be symbolic of this particular meaning?

30.

Now that you have read the poem in detail, we can begin to ask what the poem might mean. Here are two suggestions. Can you think of others?(i) Does the poem present a conflict between man and nature? Compare it with A Tiger in the Zoo. Is the poet suggesting that plants and trees, used for ‘interior decoration’ in cities while forests are cut down, are ‘imprisoned’, and need to‘break out’?(ii) On the other hand, Adrienne Rich has been known to use trees as a metaphor for human beings: this is a recurrent image in her poetry.What new meanings emerge from the poem if you take its trees to be symbolic of this particular meaning?

Answer»

Now that you have read the poem in detail, we can begin to ask what the poem might mean. Here are two suggestions. Can you think of others?

(i) Does the poem present a conflict between man and nature? Compare it with A Tiger in the Zoo. Is the poet suggesting that plants and trees, used for ‘interior decoration’ in cities while forests are cut down, are ‘imprisoned’, and need to‘break out’?

(ii) On the other hand, Adrienne Rich has been known to use trees as a metaphor for human beings: this is a recurrent image in her poetry.What new meanings emerge from the poem if you take its trees to be symbolic of this particular meaning?

Discussion

31.

Rewrite the following table in such a way that column 2 and column 3 matches column 1. Column 1 Column 2 Column 3 Dispersion Change in the direction of ray of light due to change in medium. Blue colour of the sky. Scattering Splitting of white light into component colours Twinkling of stars. Refraction Deflection of light by small particles. Spectrum of seven colours.

Answer»

Rewrite the following table in such a way that column 2 and column 3 matches column 1.

Column 1	Column 2	Column 3
Dispersion	Change in the direction of ray of light due to change in medium.	Blue colour of the sky.
Scattering	Splitting of white light into component colours	Twinkling of stars.
Refraction	Deflection of light by small particles.	Spectrum of seven colours.

Discussion

32.	79 Explain NO structure
Answer» 79 Explain NO structure

Discussion

33.	What is total internal reflection?
Answer» What is total internal reflection?

Discussion

34.	If an object has zero momentum.........wh wh will be it's kinetic energy.........(can the velocity also never be 0)??????
Answer» If an object has zero momentum.........wh wh will be it's kinetic energy.........(can the velocity also never be 0)??????

Discussion

35.	Calculate the resultant moment of forces about the point B.
Answer» Calculate the resultant moment of forces about the point B.

35.

Calculate the resultant moment of forces about the point B.

Answer»

Calculate the resultant moment of forces about the point B.

Discussion

36.	What is the value of acceleration due to gravity on the moon?(g is the acceleration due to gravity on the Earth)
Answer» What is the value of acceleration due to gravity on the moon? ( $g$ is the acceleration due to gravity on the Earth)

36.

What is the value of acceleration due to gravity on the moon?(g is the acceleration due to gravity on the Earth)

Answer»

What is the value of acceleration due to gravity on the moon?

( $g$ is the acceleration due to gravity on the Earth)

Discussion

37.	Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)?
Answer» Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)?

Discussion

38.	What is meaning of (psi)Wavefunction ?
Answer» What is meaning of (psi)Wavefunction ?

Discussion

39.	An image is formed at a distance of 12 cm from a concave mirror. The image formed is real and four times larger than the object. Calculate the object distance from the mirror.
Answer» An image is formed at a distance of $12 cm$ from a concave mirror. The image formed is real and four times larger than the object. Calculate the object distance from the mirror.

Discussion

40.	What is the acceleration due to gravity at a dis†an ce 3r from the centre of the earth if the gravitational potential at a dis†an ce r from the centre of the earth is V?\lbrack assume r>R where R is radius of earth
Answer» What is the acceleration due to gravity at a dis†an ce 3r from the centre of the earth if the gravitational potential at a dis†an ce r from the centre of the earth is V?\lbrack assume r>R where R is radius of earth

Discussion

41.	two fat astronauts each of mass 120kg are travelling in a closed spaceship moving at a speed of 15km/s in the outer space far from all other objects.the total mass of spaceship and its contents including astronauts is 660kg .if the astronauts do slimming exercidse and reduce their masses to 90kg. ,with what velocity does spaceship move
Answer» two fat astronauts each of mass 120kg are travelling in a closed spaceship moving at a speed of 15km/s in the outer space far from all other objects.the total mass of spaceship and its contents including astronauts is 660kg .if the astronauts do slimming exercidse and reduce their masses to 90kg. ,with what velocity does spaceship move

Discussion

42.	Why in a mirror of small aperture,the point of incidence by light ray parllel and close to principle axis and the point of pole coinside?
Answer» Why in a mirror of small aperture,the point of incidence by light ray parllel and close to principle axis and the point of pole coinside?

Discussion

43.	How does the bulb glow when electrons start moving.
Answer» How does the bulb glow when electrons start moving.

Discussion

44.	The future you synthesizes a new element. A neutral atom of the element, say 'X', has 4 electrons and 2 neutrons. How will you represent the nucleus of the element in your award-winning paper?
Answer» The future you synthesizes a new element. A neutral atom of the element, say 'X', has 4 electrons and 2 neutrons. How will you represent the nucleus of the element in your award-winning paper?

Discussion

45.	The focal length of a concave mirror is 10 cm. Find its radius of curvature.
Answer» The focal length of a concave mirror is 10 cm. Find its radius of curvature.

Discussion

46.	CAN A CONVEX MIRROR PRODUCE A REAL IMAGE
Answer» CAN A CONVEX MIRROR PRODUCE A REAL IMAGE

Discussion

47.	1. Gas Outlet 2. Manure 3. Slurry 4. Digester.
Answer» 1. Gas Outlet 2. Manure 3. Slurry 4. Digester.

47.

1. Gas Outlet 2. Manure 3. Slurry 4. Digester.

Answer»

1. Gas Outlet 2. Manure 3. Slurry 4. Digester.

Discussion

48.	An electric kettle consumes 1 KW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?Availability of the fuses are 2A, 4A, 5A.
Answer» An electric kettle consumes 1 KW of electric power when operated at 220 V. A fuse wire of what rating must be used for it? Availability of the fuses are 2A, 4A, 5A.

Discussion

49.	A wire of resistivity p(rho symbol) is stretched to double of its length.Find its new resistance and resistivity.
Answer» A wire of resistivity p(rho symbol) is stretched to double of its length.Find its new resistance and resistivity.

Discussion

50.

Which of the following is not attracted by a magnet ? (a) steel (b) cobalt (c) brass (d) nickel

Answer»

Which of the following is not attracted by a magnet ?

(a) steel

(b) cobalt

(c) brass

(d) nickel

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In what respect, is a toroid differentfrom a solenoid? Draw and comparethe pattern of the magnetic fieldlines in the two cases.THE

A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate percent efficiency of the work?

two point charges repel each other with a force of 100 N.One of the charges is increased by 10% and another is reduced by 10%.the new force of repulsion at same distance is to be

Acid rain happens because:

1 kg of ice at 0∘C is mixed with 1 kg of steam at 100∘C. What will be the composition of the system when thermal equilibrium is reached? Latent heat of fusion of ice = 3.36 × 105 J kg−1 and latent heat of vaporization of water = 2.26 × 106 J kg−1

41.Find teh equivalent of capacitence between A & B if each capacitor of capacity C is connected as shown

electron gain enthalpy of F is -328 kJ/mol.ionisation energy of F^{} ion will be (IE_1 of F is +1683 kJ/mol)

51.for an angle of incidence of 45^° for a ray ,moving from glass to water ,what is the maximum refractive index of glass for total internal reflection ?( for water=4/3)

300 g of coconut oil at 50∘C is mixed with 500 g kerosene at 10∘C. Determine the temperature of the mixture. (Specific heat of coconut oil = 2100 J kg−1 K−1 and specific heat of kerosene = 2000 J kg−1 K−1.

A cook uses a fire tong of length 28 cm to lift a piece of burning coal of mass 250 g. If he applies his effort at a distance of 7 cm from the fulcrum, then the effort required in SI units will be? Take g= 10 m s-2. Thala for a reasonDhoniMahendra Singh dhoniMSD

why is the angle of deviation maximum for grazing incidence in a prism

In a neutral sphere 5×10^{21 }electrons are present . If 10 % electrons are removed , then calculate the charge on the sphere?

Which of the following is/are the characteristics of a fuse wire?

(a) Which of the following quantity determines the loudness of a sound wave ? (i) wavelength, (ii) frequency, and (c) amplitude. (b) How is loudness related to the quantity mentioned above in part (a) ?

Focal length of concave lens shown in figure is 60 cm. For an object placed at ′c′ on principal axis, find image position and its size.

Which one of the following sets of phenomena would increase on raising the temperature?

On what factors does the internal resistance of a cell depend? [2 MARKS]

Temperature coefficient of resistance to a wire is 0.00125 per degree Celsius. At 300 degree Celsius, resistance is 1 ohm .what is temperature when resistance is 2 Ohm?

A frame CDEF is placed in a region where a magnetic field B is present. A rod of length 1 metre moves with constant velocity 20m/s and strength of magnetic field is 1 T. The power spent in the process is ( take R=0.2 ohm all othet wires and rod have 0 resistance.)

6, A parabolic section of wire OA is located in xy plane and carries a current of 12A. A uniform magnetic field of 4T making an angle 60^° with x-axis exists in xy plane. Calculate the magnetic force (in N) on wire O

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

Heat is a path function while Heat at cons†an t volume is a state function.why

When electricity is passed through a solution ofAICI 13.5 g of Al is deposited. The number offaradays must be

Question 12When light rays enter the eye, most of the refraction occurs at the(a) crystalline lens(b) outer surface of the cornea(c) iris(d) pupil

A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered (a) the least, (b) the most.

A wire loop is formed by joining two semi-circular wires of radii R1 and R2 carrying current I as shown in the given diagram. The magnitude of net magnetic field at the centre O is

79 Explain NO structure

What is total internal reflection?

If an object has zero momentum.........wh wh will be it's kinetic energy.........(can the velocity also never be 0)??????

Calculate the resultant moment of forces about the point B.

What is the value of acceleration due to gravity on the moon?(g is the acceleration due to gravity on the Earth)

What is meaning of (psi)Wavefunction ?

An image is formed at a distance of 12 cm from a concave mirror. The image formed is real and four times larger than the object. Calculate the object distance from the mirror.

What is the acceleration due to gravity at a dis†an ce 3r from the centre of the earth if the gravitational potential at a dis†an ce r from the centre of the earth is V?\lbrack assume r>R where R is radius of earth

Why in a mirror of small aperture,the point of incidence by light ray parllel and close to principle axis and the point of pole coinside?

How does the bulb glow when electrons start moving.

The future you synthesizes a new element. A neutral atom of the element, say 'X', has 4 electrons and 2 neutrons. How will you represent the nucleus of the element in your award-winning paper?

The focal length of a concave mirror is 10 cm. Find its radius of curvature.

CAN A CONVEX MIRROR PRODUCE A REAL IMAGE

1. Gas Outlet 2. Manure 3. Slurry 4. Digester.

An electric kettle consumes 1 KW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?Availability of the fuses are 2A, 4A, 5A.

A wire of resistivity p(rho symbol) is stretched to double of its length.Find its new resistance and resistivity.

Which of the following is not attracted by a magnet ? (a) steel (b) cobalt (c) brass (d) nickel