16569 + Interview Questions in Physics

1.	A rectangular channel of width 12 m carries 18 cumecs of water at a depth of 0.5 m. The change in water surface elevation at the transition where bed width is increased to 15 m is____ .(Answer in metres, rounded off to two decimal places) -0.17
Answer» A rectangular channel of width 12 m carries 18 cumecs of water at a depth of 0.5 m. The change in water surface elevation at the transition where bed width is increased to 15 m is____ .(Answer in metres, rounded off to two decimal places) -0.17

Discussion

2.	why the skin effect of ac is more than dc current
Answer» why the skin effect of ac is more than dc current

Discussion

3.	It is found that electromagnetic signals sent inside glass sphere from A towards B reach diametrically opposite point C. The speed of electromagnetic signals in glass cannot be:
Answer» It is found that electromagnetic signals sent inside glass sphere from A towards B reach diametrically opposite point C. The speed of electromagnetic signals in glass cannot be:

Discussion

4.	A light ray enters a rectangular glass slab from air. At the first surface of refraction, i is the angle of incidence and r is the angle of refraction. Which of the following statements is correct?
Answer» A light ray enters a rectangular glass slab from air. At the first surface of refraction, $i$ is the angle of incidence and $r$ is the angle of refraction. Which of the following statements is correct?

Discussion

5.	Which is the major constituent of biogas?
Answer» Which is the major constituent of biogas?

Discussion

6.	Two small bar magnets are placed at a line of certain dus†an ce d apart.if the length of each magnets are neglegible compared to d the force between them will be inversly proportional to a) d2 b) d c) d3 d) d
Answer» Two small bar magnets are placed at a line of certain dus†an ce d apart.if the length of each magnets are neglegible compared to d the force between them will be inversly proportional to a) d2 b) d c) d3 d) d

Discussion

7.	An electric lamp of 18A, 60W is connected across a battery of 10V. If the lamp gives out 7.5 Js for giving out light, What is the percentage of energy that the lamp transforms to light?
Answer» An electric lamp of 18A, 60W is connected across a battery of 10V. If the lamp gives out 7.5 $\frac{J}{s}$ for giving out light, What is the percentage of energy that the lamp transforms to light?

Discussion

8.	4.The velocity acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to?
Answer» 4.The velocity acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to?

Discussion

9.	Difference between EMISSION SPECTRUM AND ABSORPTION SPECTRUM,
Answer» Difference between EMISSION SPECTRUM AND ABSORPTION SPECTRUM,

Discussion

10.	A lens which is thinner at its centre than at its edges is called ___.
Answer» A lens which is thinner at its centre than at its edges is called ___.

Discussion

11.	An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm find the position and nature of the image
Answer» An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm find the position and nature of the image

Discussion

12.	Let's say the charge of an electron is -1e. Then if I charge up my cat, which of these can be a possible value of charge it aquires?
Answer» Let's say the charge of an electron is -1e. Then if I charge up my cat, which of these can be a possible value of charge it aquires?

Discussion

13.	Give any two reasons for the extinction of wildlife species.
Answer» Give any two reasons for the extinction of wildlife species.

Discussion

14.	The masses of the earth and moon are 6×1024kg and 7.4×1022kg, respectively. The distance between them is 3.84×105m. Calculate the gravitational force of attraction between the two. Use G=6.67×10−11Nm2kg−2
Answer» The masses of the earth and moon are $6 \times 10^{24} k g$ and $7.4 \times 10^{22} k g$ , respectively. The distance between them is $3.84 \times 10^{5} m$ . Calculate the gravitational force of attraction between the two. Use $G = 6.67 \times 10^{- 11} N m^{2} k g^{- 2}$

14.

The masses of the earth and moon are 6×1024kg and 7.4×1022kg, respectively. The distance between them is 3.84×105m. Calculate the gravitational force of attraction between the two. Use G=6.67×10−11Nm2kg−2

Answer»

The masses of the earth and moon are $6 \times 10^{24} k g$ and $7.4 \times 10^{22} k g$ , respectively. The distance between them is $3.84 \times 10^{5} m$ . Calculate the gravitational force of attraction between the two. Use $G = 6.67 \times 10^{- 11} N m^{2} k g^{- 2}$

Discussion

15.	Example of intrinsic colloid is
Answer» Example of intrinsic colloid is

Discussion

16.	Which department in the government controls and takes care of forests? __
Answer» Which department in the government controls and takes care of forests? __

Discussion

17.	An iron sphere of mass 5 kg has the same diameter as an aluminium sphere of mass 4 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 5 kg has the same diameter as an aluminium sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same

Discussion

18.	A uniform conducting wire offers a resistance of 60 Ω. It is cut into 12 equal parts and 6 of them are connected in parallel and remaining 6 are connected in series. This parallel bundle is connected in series with the series chain. Then, find the net resistance.
Answer» A uniform conducting wire offers a resistance of 60 Ω. It is cut into 12 equal parts and 6 of them are connected in parallel and remaining 6 are connected in series. This parallel bundle is connected in series with the series chain. Then, find the net resistance.

Discussion

19.	Three resistances x1 , x2 and x3 are connected in a circuit in different ways. x is the effective resistance. The properties observed for these different ways of connecting x1 , x2 and x3 are given below. Write the way in which they are connected in each case. (I-current, V potential difference, x-effective resistance) a. Current I flows through x1 , x2 and x3b. x is larger than x1 , x2 and x3c. x is smaller than x1 , x2 and x3d. The potential difference across x1 , x2 and x3 is the samee. x = x1 + x2 + x3f. x = 11x1+ 1x2 +1x3
Answer» Three resistances x₁ , x₂ and x₃are connected in a circuit in different ways. x is the effective resistance. The properties observed for these different ways of connecting x₁, x₂ and x₃are given below. Write the way in which they are connected in each case. (I-current, V potential difference, x-effective resistance) a. Current I flows through x₁ , x₂and x₃ b. x is larger than x₁, x₂ and x₃ c. x is smaller than x₁ , x₂and x₃ d. The potential difference across x₁ , x₂and x₃ is the same e. x = x₁ + x₂ + x3 f. $x = \frac{1}{\frac{1}{x_{1}} + \frac{1}{x_{2}} + \frac{1}{x_{3}}}$

Discussion

20.	A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard. (a) Name the type of defect he is suffering from. (b) How can this defect by corrected ?
Answer» A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard. (a) Name the type of defect he is suffering from. (b) How can this defect by corrected ?

Discussion

21.	(a) Name the major industries which are based on forest produce. (b) State the main aim of the management of forests and wildlife. (c) Name the four main stakeholders in the management of forest resources.
Answer» (a) Name the major industries which are based on forest produce. (b) State the main aim of the management of forests and wildlife. (c) Name the four main stakeholders in the management of forest resources.

Discussion

22.	In a dc motor running at 1800 rpm, the hysteresis and eddy current losses are 400 W and 180 W respectively. If the flux remain constant, the speed at which the total iron losses are halved is _____rpm.1038
Answer» In a dc motor running at 1800 rpm, the hysteresis and eddy current losses are 400 W and 180 W respectively. If the flux remain constant, the speed at which the total iron losses are halved is _____rpm. 1038

Discussion

23.	What is OTEC? How does it work?
Answer» What is OTEC? How does it work?

Discussion

24.	The ionization energy of lithium + ion is 19.6 into 10 power minus 18 joules per atom calculate the energy of the first excited state of lithium plus 2 ion.
Answer» The ionization energy of lithium + ion is 19.6 into 10 power minus 18 joules per atom calculate the energy of the first excited state of lithium plus 2 ion.

Discussion

25.	A woman bends over me,Searching my reaches for what she really is.Then she turns to those liars, the candles or the moon.What is the woman bending over?i.the mirrorii.the lakeiii.the opposite walliv.the moon and the candles
Answer» A woman bends over me, Searching my reaches for what she really is. Then she turns to those liars, the candles or the moon. What is the woman bending over? i.the mirror ii.the lake iii.the opposite wall iv.the moon and the candles

25.

A woman bends over me,Searching my reaches for what she really is.Then she turns to those liars, the candles or the moon.What is the woman bending over?i.the mirrorii.the lakeiii.the opposite walliv.the moon and the candles

Answer»

A woman bends over me,

Searching my reaches for what she really is.

Then she turns to those liars, the candles or the moon.

What is the woman bending over?

i.the mirror

ii.the lake

iii.the opposite wall

iv.the moon and the candles

Discussion

26.	When does strong nuclear force become repulsive in nature and what is the nature of weak nuclear force?
Answer» When does strong nuclear force become repulsive in nature and what is the nature of weak nuclear force?

Discussion

27.	An object is initially at a distance of 160 cm from a plane mirror. If the mirror approaches the object at a rate of 10cm/s then after 4s the distance between the object and its image will be
Answer» An object is initially at a distance of 160 cm from a plane mirror. If the mirror approaches the object at a rate of 10cm/s then after 4s the distance between the object and its image will be

Discussion

28.	Question 9A certain household has consumed 250 units of energy during a month. How much energy is this in joules?
Answer» Question 9 A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

Discussion

29.	the resonance tube is resonated with tuning fork of frequency 256 Hz.If the length of first and second resonating air columns are 32 cm and 100cm,then how much will be end correction
Answer» the resonance tube is resonated with tuning fork of frequency 256 Hz.If the length of first and second resonating air columns are 32 cm and 100cm,then how much will be end correction

Discussion

30.	A needle 4 cm high is placed in front of a lens. Image of the needle is real ,inverted and 6 cm high , when distance between the needle and its image is 20 cm. Find the focal leght of lens and also write the type if this lens.
Answer» A needle 4 cm high is placed in front of a lens. Image of the needle is real ,inverted and 6 cm high , when distance between the needle and its image is 20 cm. Find the focal leght of lens and also write the type if this lens.

Discussion

31.	Photonics is study of
Answer» Photonics is study of

Discussion

32.	How to find the n factor in different cases.
Answer» How to find the n factor in different cases.

Discussion

33.	The direction of induced current can be found by using ______.
Answer» The direction of induced current can be found by using ______.

Discussion

34.	Explain why the planets do not twinkle but the stars twinkle.
Answer» Explain why the planets do not twinkle but the stars twinkle.

Discussion

35.	The focal length of a convex lens in air is fair=10 cm. If its focal length in water is nfair. The value of n is (integer only)[Given that μl=32 and μw=43]
Answer» The focal length of a convex lens in air is $f_{a i r} = 10 cm$ . If its focal length in water is $n f_{a i r} .$ The value of $n$ is (integer only) [Given that $μ_{l} = \frac{3}{2}$ and $μ_{w} = \frac{4}{3}$ ]

Discussion

36.

Match the ‘environment words’ with their meanings. Words Meanings Ecology A person who advocates preservation and careful management of natural resources. Habitat The variety and variability among living organisms and the ecological complexes in which they occur. Herpetologist The relationship of living things to one another and their environment, or the study of such relationships. Extinct Tropical evergreen trees or shrubs forming dense thickets along tidal shores. Aquifer A place where a population lives and its surroundings, both living and non-living. Naturalist A zoologist who studies reptiles and amphibians. Biodiversity Having no living representative. Mangrove An underground geological formation, containing water. Conservationist A person who studies plants and animals, especially outdoors.

Answer»

Match the ‘environment words’ with their meanings.

Words	Meanings
Ecology	A person who advocates preservation and careful management of natural resources.
Habitat	The variety and variability among living organisms and the ecological complexes in which they occur.
Herpetologist	The relationship of living things to one another and their environment, or the study of such relationships.
Extinct	Tropical evergreen trees or shrubs forming dense thickets along tidal shores.
Aquifer	A place where a population lives and its surroundings, both living and non-living.
Naturalist	A zoologist who studies reptiles and amphibians.
Biodiversity	Having no living representative.
Mangrove	An underground geological formation, containing water.
Conservationist	A person who studies plants and animals, especially outdoors.

Discussion

37.	Find the voltage VA in the circuit shown in figure. The potential barrier for Ge is 0.3 V and for Si is 0.7 V.
Answer» Find the voltage $V_{A}$ in the circuit shown in figure. The potential barrier for $Ge$ is $0.3 V$ and for $Si$ is $0.7 V .$

Discussion

38.	19.Why direction of dipole moment is from negative to positive
Answer» 19.Why direction of dipole moment is from negative to positive

Discussion

39.	A rifle bullet of mass 5 g shot into a still target with a velocity of 150 m s−1, comes to rest in the target after penetrating about 30 cm. What is the resistive force (in N) offered by the target to the bullet?-187.5
Answer» A rifle bullet of mass $5 g$ shot into a still target with a velocity of $150 {m s}^{- 1}$ , comes to rest in the target after penetrating about $30 cm$ . What is the resistive force (in $N$ ) offered by the target to the bullet? -187.5

Discussion

40.	The resistivity of a wire at 20^0C and 100^0C is 3Ω-m and 4Ω-m respectively. The resistivity of the wire at 0^0C is: Option 1: 11/4 ohm-m Option 2: 4/11 ohm-m Option 3: 3/4 ohm-m Option 4: 11/3 ohm-m
Answer» The resistivity of a wire at 20^0C and 100^0C is 3Ω-m and 4Ω-m respectively. The resistivity of the wire at 0^0C is: Option 1: 11/4 ohm-m Option 2: 4/11 ohm-m Option 3: 3/4 ohm-m Option 4: 11/3 ohm-m

Discussion

41.	the intensity of sound of50 dB is
Answer» the intensity of sound of50 dB is

Discussion

42.	Equivalent conductance of saturated BaSO4 is400 ohm -1cm2equi-1 and specific conductanceis 8x10-5 ohm-1 cm-1. Hence Ken of BaSO4 is-(A)4x10-8 M2(B) 1x10-8 M2(C) 2x10-4 M2(D) 1x10-4 M2
Answer» Equivalent conductance of saturated BaSO4 is400 ohm -1cm2equi-1 and specific conductanceis 8x10-5 ohm-1 cm-1. Hence Ken of BaSO4 is-(A)4x10-8 M2(B) 1x10-8 M2(C) 2x10-4 M2(D) 1x10-4 M2

Discussion

43.	What is Cherenkov Radiation and why does it occur?
Answer» What is Cherenkov Radiation and why does it occur?

Discussion

44.	47.What is radial force?
Answer» 47.What is radial force?

Discussion

45.	how many electron flowing per second past a point in a circuit in which there is a current of 5amper
Answer» how many electron flowing per second past a point in a circuit in which there is a current of 5amper

Discussion

46.	An object either will not be moving or moving at a constant angular velocity, then that object___
Answer» An object either will not be moving or moving at a constant angular velocity, then that object___

Discussion

47.	(a) Copy this figure in your answer-book and show the direction of the light ray after reflection:(b) What type of mirror is shown in the above figure: a converging mirror or a diverging mirror?
Answer» (a) Copy this figure in your answer-book and show the direction of the light ray after reflection: (b) What type of mirror is shown in the above figure: a converging mirror or a diverging mirror?

Discussion

48.	A man with normal near point (25 cm) reads a book with small print using a magnifying thin convex lens of focal length 5 cm. What is the closest and farthest distance at which he can read the book when viewing through the magnifying glass?
Answer» A man with normal near point $(25 cm)$ reads a book with small print using a magnifying thin convex lens of focal length $5 cm$ . What is the closest and farthest distance at which he can read the book when viewing through the magnifying glass?

Discussion

49.	52.Electric flux passing through the plate of as shown in figure
Answer» 52.Electric flux passing through the plate of as shown in figure

Discussion

50.	The iron door of a building is 3 m broad. It can be opened by applying a force of 100 N normally at the middle of the door. Calculate the torque applied on the door.
Answer» The iron door of a building is $3 m$ broad. It can be opened by applying a force of $100 N$ normally at the middle of the door. Calculate the torque applied on the door.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A rectangular channel of width 12 m carries 18 cumecs of water at a depth of 0.5 m. The change in water surface elevation at the transition where bed width is increased to 15 m is____ .(Answer in metres, rounded off to two decimal places) -0.17

why the skin effect of ac is more than dc current

It is found that electromagnetic signals sent inside glass sphere from A towards B reach diametrically opposite point C. The speed of electromagnetic signals in glass cannot be:

A light ray enters a rectangular glass slab from air. At the first surface of refraction, i is the angle of incidence and r is the angle of refraction. Which of the following statements is correct?

Which is the major constituent of biogas?

Two small bar magnets are placed at a line of certain dus†an ce d apart.if the length of each magnets are neglegible compared to d the force between them will be inversly proportional to a) d2 b) d c) d3 d) d

An electric lamp of 18A, 60W is connected across a battery of 10V. If the lamp gives out 7.5 Js for giving out light, What is the percentage of energy that the lamp transforms to light?

4.The velocity acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to?

Difference between EMISSION SPECTRUM AND ABSORPTION SPECTRUM,

A lens which is thinner at its centre than at its edges is called ___.

An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm find the position and nature of the image

Let's say the charge of an electron is -1e. Then if I charge up my cat, which of these can be a possible value of charge it aquires?

Give any two reasons for the extinction of wildlife species.

The masses of the earth and moon are 6×1024kg and 7.4×1022kg, respectively. The distance between them is 3.84×105m. Calculate the gravitational force of attraction between the two. Use G=6.67×10−11Nm2kg−2

Example of intrinsic colloid is

Which department in the government controls and takes care of forests? __

An iron sphere of mass 5 kg has the same diameter as an aluminium sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same

A uniform conducting wire offers a resistance of 60 Ω. It is cut into 12 equal parts and 6 of them are connected in parallel and remaining 6 are connected in series. This parallel bundle is connected in series with the series chain. Then, find the net resistance.

A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard. (a) Name the type of defect he is suffering from. (b) How can this defect by corrected ?

(a) Name the major industries which are based on forest produce. (b) State the main aim of the management of forests and wildlife. (c) Name the four main stakeholders in the management of forest resources.

In a dc motor running at 1800 rpm, the hysteresis and eddy current losses are 400 W and 180 W respectively. If the flux remain constant, the speed at which the total iron losses are halved is _____rpm.1038

What is OTEC? How does it work?

The ionization energy of lithium + ion is 19.6 into 10 power minus 18 joules per atom calculate the energy of the first excited state of lithium plus 2 ion.

A woman bends over me,Searching my reaches for what she really is.Then she turns to those liars, the candles or the moon.What is the woman bending over?i.the mirrorii.the lakeiii.the opposite walliv.the moon and the candles

When does strong nuclear force become repulsive in nature and what is the nature of weak nuclear force?

An object is initially at a distance of 160 cm from a plane mirror. If the mirror approaches the object at a rate of 10cm/s then after 4s the distance between the object and its image will be

Question 9A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

the resonance tube is resonated with tuning fork of frequency 256 Hz.If the length of first and second resonating air columns are 32 cm and 100cm,then how much will be end correction

A needle 4 cm high is placed in front of a lens. Image of the needle is real ,inverted and 6 cm high , when distance between the needle and its image is 20 cm. Find the focal leght of lens and also write the type if this lens.

Photonics is study of

How to find the n factor in different cases.

The direction of induced current can be found by using ______.

Explain why the planets do not twinkle but the stars twinkle.

The focal length of a convex lens in air is fair=10 cm. If its focal length in water is nfair. The value of n is (integer only)[Given that μl=32 and μw=43]

Find the voltage VA in the circuit shown in figure. The potential barrier for Ge is 0.3 V and for Si is 0.7 V.

19.Why direction of dipole moment is from negative to positive

A rifle bullet of mass 5 g shot into a still target with a velocity of 150 m s−1, comes to rest in the target after penetrating about 30 cm. What is the resistive force (in N) offered by the target to the bullet?-187.5

The resistivity of a wire at 20^0C and 100^0C is 3Ω-m and 4Ω-m respectively. The resistivity of the wire at 0^0C is: Option 1: 11/4 ohm-m Option 2: 4/11 ohm-m Option 3: 3/4 ohm-m Option 4: 11/3 ohm-m

the intensity of sound of50 dB is

Equivalent conductance of saturated BaSO4 is400 ohm -1cm2equi-1 and specific conductanceis 8x10-5 ohm-1 cm-1. Hence Ken of BaSO4 is-(A)4x10-8 M2(B) 1x10-8 M2(C) 2x10-4 M2(D) 1x10-4 M2

What is Cherenkov Radiation and why does it occur?

47.What is radial force?

how many electron flowing per second past a point in a circuit in which there is a current of 5amper

An object either will not be moving or moving at a constant angular velocity, then that object___

(a) Copy this figure in your answer-book and show the direction of the light ray after reflection:​(b) What type of mirror is shown in the above figure: a converging mirror or a diverging mirror?

A man with normal near point (25 cm) reads a book with small print using a magnifying thin convex lens of focal length 5 cm. What is the closest and farthest distance at which he can read the book when viewing through the magnifying glass?

52.Electric flux passing through the plate of as shown in figure

The iron door of a building is 3 m broad. It can be opened by applying a force of 100 N normally at the middle of the door. Calculate the torque applied on the door.

(a) Copy this figure in your answer-book and show the direction of the light ray after reflection:(b) What type of mirror is shown in the above figure: a converging mirror or a diverging mirror?