16569 + Interview Questions in Physics

1.	Difference between overloading and short circuiting in domestic circuit.
Answer» Difference between overloading and short circuiting in domestic circuit.

Discussion

2.	19. A long solenoid of radius 2cm has 100turns/cm and carries a current of 5A .A coil of radius 1cm having 100 turns and total resistance 20 ohm is placed inside the solenoid coaxially .the coil is connected to galvanometer .if the current in the solenoid is reversed in the direction find the charge flown through the galvonometer.
Answer» 19. A long solenoid of radius 2cm has 100turns/cm and carries a current of 5A .A coil of radius 1cm having 100 turns and total resistance 20 ohm is placed inside the solenoid coaxially .the coil is connected to galvanometer .if the current in the solenoid is reversed in the direction find the charge flown through the galvonometer.

Discussion

3.	Which of the following reaction takes place in hydrogen fuel cell?
Answer» Which of the following reaction takes place in hydrogen fuel cell?

Discussion

4.	Mention he disadvantages of electrical appliances connected in series , during domestic wiring
Answer» Mention he disadvantages of electrical appliances connected in series , during domestic wiring

Discussion

5.	nta whistle revolves in a circle with angular speed w=20 rad/sec using a string of 50 cm. if fruency of sound from the whistle is 385 hz.n ntthen what is the minium freuency heard by an observer who is far away from the centre. Vsound=340 m/s ?n
Answer» nta whistle revolves in a circle with angular speed w=20 rad/sec using a string of 50 cm. if fruency of sound from the whistle is 385 hz.n ntthen what is the minium freuency heard by an observer who is far away from the centre. Vsound=340 m/s ?n

Discussion

6.	In an auto engine with no pollution controls about 5% of the fuel (C8H18) is unburned. Molar ratio of CO and C8H18 emitted in the exhaust gas is (A) 100. (B) 150 (C) 50. (D) 5
Answer» In an auto engine with no pollution controls about 5% of the fuel (C8H18) is unburned. Molar ratio of CO and C8H18 emitted in the exhaust gas is (A) 100. (B) 150 (C) 50. (D) 5

Discussion

7.	A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is 27∘C and its melting point is 327∘C. Latent heat of fusion of lead = 2.5 × 104 J kg−1 and specific heat capacity of lead = 125 J kg−1 K−1.
Answer» A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is $27^{\circ} C$ and its melting point is $327^{\circ} C$ . Latent heat of fusion of lead = $2.5 \times 10^{4} J k g^{- 1}$ and specific heat capacity of lead = $125 J k g^{- 1} K^{- 1}$ .

Discussion

8.	Q.1 what is law of conservation of energyQ.2 what is law of angular momentumQ.3 how electromagnetism and optics are unified
Answer» Q.1 what is law of conservation of energy Q.2 what is law of angular momentum Q.3 how electromagnetism and optics are unified

Discussion

9.	Q. A Flywheel of mass 60 kg and radius 40cm is revolving at 300 rpm then its rotational K.E. is a\rbrack 48/π^{2 } J b\rbrack 480π J c\rbrack 48/π J d\rbrack 240π^2 J
Answer» Q. A Flywheel of mass 60 kg and radius 40cm is revolving at 300 rpm then its rotational K.E. is a\rbrack 48/π^{2 } J b\rbrack 480π J c\rbrack 48/π J d\rbrack 240π^2 J

Discussion

10.	Difference between concave and concvex mirror.
Answer» Difference between concave and concvex mirror.

Discussion

11.	A plano convex lens when silvered in the plane side behaves like a concave mirror of focal length 60 cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 20 cm. Then the refractive index of the material will be
Answer» A plano convex lens when silvered in the plane side behaves like a concave mirror of focal length $60 c m$ . However, when silvered on the convex side it behaves like a concave mirror of focal length $20 c m$ . Then the refractive index of the material will be

Discussion

12.	Consider the following processes: 1. Wind rotates the blades of the windmill. 2. Electrical energy produced. 3. Turbine rotates. 4. Blowing of wind. Which of the following predicts the correct order of events?
Answer» Consider the following processes: 1. Wind rotates the blades of the windmill. 2. Electrical energy produced. 3. Turbine rotates. 4. Blowing of wind. Which of the following predicts the correct order of events?

Discussion

13.	35.The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens
Answer» 35.The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens

Discussion

14.	Find the Q value of fusion reaction
Answer» Find the Q value of fusion reaction

Discussion

15.	When traveling obliquely from one medium to another medium, the direction of light rays in the second medium ___
Answer» When traveling obliquely from one medium to another medium, the direction of light rays in the second medium ___

Discussion

16.	Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.
Answer» Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Discussion

17.	Khadins are used in Rajasthan to: (a) hold water for irrigation (b) recharge groundwater (c) promote soil erosion (d) trap wild animals
Answer» Khadins are used in Rajasthan to: (a) hold water for irrigation (b) recharge groundwater (c) promote soil erosion (d) trap wild animals

Discussion

18.	a telescope has an objective lens of focal length 200 cm and eyepiece with focal length 2 cm. if this telescope is used to see a 50m tall building at a dis†an ce of 2 km, what is the height of the image of the building formed by the objective lens
Answer» a telescope has an objective lens of focal length 200 cm and eyepiece with focal length 2 cm. if this telescope is used to see a 50m tall building at a dis†an ce of 2 km, what is the height of the image of the building formed by the objective lens

Discussion

19.	escape velocity from earth is ve ,body is projected with\sqrt{5ve vd what cons†an t v will it move in the}intyer planetery sopace
Answer» escape velocity from earth is ve ,body is projected with\sqrt{5ve vd what cons†an t v will it move in the}intyer planetery sopace

Discussion

20.	What are the methods used to increase the boiling point of water in pressure cooker and in the radiator of vehicles
Answer» What are the methods used to increase the boiling point of water in pressure cooker and in the radiator of vehicles

Discussion

21.	What is the formula for rocket propulsion
Answer» What is the formula for rocket propulsion

Discussion

22.	When a cell is in open circuit, terminal potential difference is found to be 5V. When the cell is connected to resistance of 10 ohm, terminal potential is found to be 3V. Find the internal resistance of the cell.
Answer» When a cell is in open circuit, terminal potential difference is found to be 5V. When the cell is connected to resistance of 10 ohm, terminal potential is found to be 3V. Find the internal resistance of the cell.

Discussion

23.	Give reason why the efficiency of a single movable pulley system is not 100%.
Answer» Give reason why the efficiency of a single movable pulley system is not $100 %$ .

Discussion

24.	A system in human body is involved with the excretion of toxic waste. It is:
Answer» A system in human body is involved with the excretion of toxic waste. It is:

Discussion

25.	When we rub two things then flow of electrons occur then why it does not conduct electricty
Answer» When we rub two things then flow of electrons occur then why it does not conduct electricty

Discussion

26.	When the mirror says 'it has no preconceptions' it means that: i. it reflects back an image objectively ii. it modifies an image as it reflects it iii. it beautifies an image as it reflects it iv. it gives a biased view of a person/object
Answer» When the mirror says 'it has no preconceptions' it means that: i. it reflects back an image objectively ii. it modifies an image as it reflects it iii. it beautifies an image as it reflects it iv. it gives a biased view of a person/object

26.

When the mirror says 'it has no preconceptions' it means that: i. it reflects back an image objectively ii. it modifies an image as it reflects it iii. it beautifies an image as it reflects it iv. it gives a biased view of a person/object

Answer»

When the mirror says
'it
has no preconceptions' it
means that:

i.
it reflects back an image objectively

ii.
it modifies an image as it reflects it

iii.
it beautifies an image as it reflects it

iv.
it gives a biased view of a person/object

Discussion

27.	A current will not flow in the absence of?
Answer» A current will not flow in the absence of?

Discussion

28.	An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current
Answer» An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current

Discussion

29.	In ammeter,a student sees the needle indicates 17 divisions in ammeter while performing an experiment to verify ohms Law. If ammeter has 10 divisions between 0-0.5A them what is the value of corresponding 17 divisions
Answer» In ammeter,a student sees the needle indicates 17 divisions in ammeter while performing an experiment to verify ohms Law. If ammeter has 10 divisions between 0-0.5A them what is the value of corresponding 17 divisions

Discussion

30.	A long solenoid has self inductance L.if its length is doubled keeping total number of turns constant then its new self inductance will be
Answer» A long solenoid has self inductance L. if its length is doubled keeping total number of turns constant then its new self inductance will be

Discussion

31.	A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?
Answer» A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?

Discussion

32.	What are diodes and what are its relationship with resistance on the basis of temperature
Answer» What are diodes and what are its relationship with resistance on the basis of temperature

Discussion

33.	How to find that two tuning forks of the same musical note were exactly the same?
Answer» How to find that two tuning forks of the same musical note were exactly the same?

Discussion

34.	Which of the following statement is not true for a Hydrogen fuel?
Answer» Which of the following statement is not true for a Hydrogen fuel?

Discussion

35.	A student is performing an experiment with two triangular glass prisms. He places the first glass prism on its base. The second glass prism is placed upside down behind the first glass prism. When a beam of white light is allowed to fall on the first glass prism, then a patch of ordinary white light is obtained on a screen placed behind the second glass prism.(a) Draw a ray diagram to show the above arrangement of two glass prisms and the light passing through them.(b) What is the function of (i) first prism, and (ii) second prism, in this arrangement?
Answer» A student is performing an experiment with two triangular glass prisms. He places the first glass prism on its base. The second glass prism is placed upside down behind the first glass prism. When a beam of white light is allowed to fall on the first glass prism, then a patch of ordinary white light is obtained on a screen placed behind the second glass prism. (a) Draw a ray diagram to show the above arrangement of two glass prisms and the light passing through them. (b) What is the function of (i) first prism, and (ii) second prism, in this arrangement?

Discussion

36.	How does increase in temperature of electrolyte decreases the internal resistance of a cell?
Answer» How does increase in temperature of electrolyte decreases the internal resistance of a cell?

Discussion

37.	An elastic circular wire of length x carries a current i. It is placed in a uniform magnetic field B ( out of paper ) such that it's plane is perpendicular to the direction of B. Force experienced by the wire is (1) compressive force (2) stretching force(3) torque(4) no force
Answer» An elastic circular wire of length x carries a current i. It is placed in a uniform magnetic field B ( out of paper ) such that it's plane is perpendicular to the direction of B. Force experienced by the wire is (1) compressive force (2) stretching force (3) torque (4) no force

Discussion

38.	If a person drops a pebble in a well of 100 m depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (taking a=10 m/s2 and speed of sound =343 m/s)
Answer» If a person drops a pebble in a well of $100 m$ depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (taking $a = 10 m / s^{2}$ and speed of sound $= 343 m / s$ )

38.

If a person drops a pebble in a well of 100 m depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (taking a=10 m/s2 and speed of sound =343 m/s)

Answer»

If a person drops a pebble in a well of $100 m$ depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble?

(taking $a = 10 m / s^{2}$ and speed of sound $= 343 m / s$ )

Discussion

39.	When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that
Answer» When light is incident on the surface of medium at angle $i$ and refracted into a second medium at an angle $r$ the graph of $s i n i$ vs $s i n r$ is as shown in the graph. From this, one can conclude that

39.

When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that

Answer»

When light is incident on the surface of medium at angle $i$ and refracted into a second medium at an angle $r$ the graph of $s i n i$ vs $s i n r$ is as shown in the graph. From this, one can conclude that

Discussion

40.	A plane convex lens (f 20 cm) is silvered at plane surface. Now f will be a.-20 cm b. -40 cm c. -30 cm d. 10 cm
Answer» A plane convex lens (f 20 cm) is silvered at plane surface. Now f will be a.-20 cm b. -40 cm c. -30 cm d. 10 cm

Discussion

41.	What are the limitations in harnessing wind energy?
Answer» What are the limitations in harnessing wind energy?

Discussion

42.	Figure shows an incident ray AO and the normal ON a plane mirror. The angle which the incident ray AO makes with the mirror is 30∘. (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.
Answer» Figure shows an incident ray AO and the normal ON a plane mirror. The angle which the incident ray AO makes with the mirror is $30^{\circ}$ . (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.

42.

Figure shows an incident ray AO and the normal ON a plane mirror. The angle which the incident ray AO makes with the mirror is 30∘. (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.

Answer»

Figure shows an incident ray AO and the normal ON a plane mirror. The angle which the incident ray AO makes with the mirror is $30^{\circ}$ . (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.

Discussion

43.	37. For a real image in a convex lens of focal length f what is the minimum distance between object and image ??
Answer» 37. For a real image in a convex lens of focal length f what is the minimum distance between object and image ??

Discussion

44.	what is EM waves specturm?
Answer» what is EM waves specturm?

Discussion

45.	The Laplace transform of the function f(t)=eat when t>0 and where a is constant is
Answer» The Laplace transform of the function $f (t) = e^{a t} w h e n t > 0$ and where $a$ is constant is

Discussion

46.	During sunrise and sunset, the colour of sun appears to be ______ .
Answer» During sunrise and sunset, the colour of sun appears to be ______ .

Discussion

47.	The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
Answer» The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.

Discussion

48.	When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:
Answer» When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:

Discussion

49.	The diagram alongside shows the refraction of a ray of light from air to a liquid. (a) Write the values of (i) angle ofincidence, and (ii) angle of refraction. (b) Use Snell's law to find the refractive index of liquid with respect to air.
Answer» The diagram alongside shows the refraction of a ray of light from air to a liquid. (a) Write the values of (i) angle ofincidence, and (ii) angle of refraction. (b) Use Snell's law to find the refractive index of liquid with respect to air.

49.

The diagram alongside shows the refraction of a ray of light from air to a liquid. (a) Write the values of (i) angle ofincidence, and (ii) angle of refraction. (b) Use Snell's law to find the refractive index of liquid with respect to air.

Answer»

The diagram alongside shows the refraction of a ray of light from air to a liquid.

(a) Write the values of (i) angle ofincidence, and (ii) angle of refraction.

(b) Use Snell's law to find the refractive index of liquid with respect to air.

Discussion

50.	What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention ? (a) Height of a real image. (b) Height of a virtual image.
Answer» What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention ? (a) Height of a real image. (b) Height of a virtual image.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Difference between overloading and short circuiting in domestic circuit.

Which of the following reaction takes place in hydrogen fuel cell?

Mention he disadvantages of electrical appliances connected in series , during domestic wiring

nta whistle revolves in a circle with angular speed w=20 rad/sec using a string of 50 cm. if fruency of sound from the whistle is 385 hz.n ntthen what is the minium freuency heard by an observer who is far away from the centre. Vsound=340 m/s ?n

In an auto engine with no pollution controls about 5% of the fuel (C8H18) is unburned. Molar ratio of CO and C8H18 emitted in the exhaust gas is (A) 100. (B) 150 (C) 50. (D) 5

Q.1 what is law of conservation of energyQ.2 what is law of angular momentumQ.3 how electromagnetism and optics are unified

Q. A Flywheel of mass 60 kg and radius 40cm is revolving at 300 rpm then its rotational K.E. is a\rbrack 48/π^{2 } J b\rbrack 480π J c\rbrack 48/π J d\rbrack 240π^2 J

Difference between concave and concvex mirror.

A plano convex lens when silvered in the plane side behaves like a concave mirror of focal length 60 cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 20 cm. Then the refractive index of the material will be

Consider the following processes: 1. Wind rotates the blades of the windmill. 2. Electrical energy produced. 3. Turbine rotates. 4. Blowing of wind. Which of the following predicts the correct order of events?

35.The distance of the eye-lens from the retina is x. For a normal eye, the maximum focal length of the eye-lens

Find the Q value of fusion reaction

When traveling obliquely from one medium to another medium, the direction of light rays in the second medium ___

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Khadins are used in Rajasthan to: (a) hold water for irrigation (b) recharge groundwater (c) promote soil erosion (d) trap wild animals

a telescope has an objective lens of focal length 200 cm and eyepiece with focal length 2 cm. if this telescope is used to see a 50m tall building at a dis†an ce of 2 km, what is the height of the image of the building formed by the objective lens

escape velocity from earth is ve ,body is projected with\sqrt{5ve vd what cons†an t v will it move in the}intyer planetery sopace

What are the methods used to increase the boiling point of water in pressure cooker and in the radiator of vehicles

What is the formula for rocket propulsion

When a cell is in open circuit, terminal potential difference is found to be 5V. When the cell is connected to resistance of 10 ohm, terminal potential is found to be 3V. Find the internal resistance of the cell.

Give reason why the efficiency of a single movable pulley system is not 100%.

A system in human body is involved with the excretion of toxic waste. It is:

When we rub two things then flow of electrons occur then why it does not conduct electricty

When the mirror says 'it has no preconceptions' it means that: i. it reflects back an image objectively ii. it modifies an image as it reflects it iii. it beautifies an image as it reflects it iv. it gives a biased view of a person/object

A current will not flow in the absence of?

An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current

In ammeter,a student sees the needle indicates 17 divisions in ammeter while performing an experiment to verify ohms Law. If ammeter has 10 divisions between 0-0.5A them what is the value of corresponding 17 divisions

A long solenoid has self inductance L.if its length is doubled keeping total number of turns constant then its new self inductance will be

A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?

What are diodes and what are its relationship with resistance on the basis of temperature

How to find that two tuning forks of the same musical note were exactly the same?

Which of the following statement is not true for a Hydrogen fuel?

How does increase in temperature of electrolyte decreases the internal resistance of a cell?

An elastic circular wire of length x carries a current i. It is placed in a uniform magnetic field B ( out of paper ) such that it's plane is perpendicular to the direction of B. Force experienced by the wire is (1) compressive force (2) stretching force(3) torque(4) no force

If a person drops a pebble in a well of 100 m depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (taking a=10 m/s2 and speed of sound =343 m/s)

When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that

A plane convex lens (f 20 cm) is silvered at plane surface. Now f will be a.-20 cm b. -40 cm c. -30 cm d. 10 cm

What are the limitations in harnessing wind energy?

Figure shows an incident ray AO and the normal ON a plane mirror. The angle which the incident ray AO makes with the mirror is 30∘. (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.

37. For a real image in a convex lens of focal length f what is the minimum distance between object and image ??

what is EM waves specturm?

The Laplace transform of the function f(t)=eat when t&gt;0 and where a is constant is

During sunrise and sunset, the colour of sun appears to be ______ .

The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.

When two different stones of masses 1 kg and 2 kg are taken to the same heights, then:

The diagram alongside shows the refraction of a ray of light from air to a liquid. (a) Write the values of (i) angle ofincidence, and (ii) angle of refraction. (b) Use Snell's law to find the refractive index of liquid with respect to air.

What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention ? (a) Height of a real image. (b) Height of a virtual image.

The Laplace transform of the function f(t)=eat when t>0 and where a is constant is