16569 + Interview Questions in Physics

1.	What is reverberation? How can it be reduced? [3 MARKS]
Answer» What is reverberation? How can it be reduced? [3 MARKS]

Discussion

2.	The dark muscular diaphragm that controls the size of the pupil is the
Answer» The dark muscular diaphragm that controls the size of the pupil is the

Discussion

3.	Question 95 The weight of an object on Moon is 16 of its weight on Earth. If an object weighs 535 kg on Earth. How much would it weigh on the Moon?
Answer» Question 95 The weight of an object on Moon is $\frac{1}{6}$ of its weight on Earth. If an object weighs $5 \frac{3}{5}$ kg on Earth. How much would it weigh on the Moon?

3.

Question 95 The weight of an object on Moon is 16 of its weight on Earth. If an object weighs 535 kg on Earth. How much would it weigh on the Moon?

Answer»

Question 95

The weight of an object on Moon is $\frac{1}{6}$ of its weight on Earth. If an object weighs $5 \frac{3}{5}$ kg on Earth. How much would it weigh on the Moon?

Discussion

4.	A ball, when kept on a spring attains a certain height after it is compressed and released. For which of the following height attained by the ball, maximum of his energy is required to compress the spring?
Answer» A ball, when kept on a spring attains a certain height after it is compressed and released. For which of the following height attained by the ball, maximum of his energy is required to compress the spring?

Discussion

5.	A 60 m long train moving with constant velocity on a straight level track passes a pole in 5 s, find the speed of the train and the time it will take to cross a 540 m long bridge.
Answer» A 60 m long train moving with constant velocity on a straight level track passes a pole in 5 s, find the speed of the train and the time it will take to cross a 540 m long bridge.

Discussion

6.	Question 123 A new born bear weights 4 kg. How many kilograms might a five year old bear weight if its weight increases by the power of 2 in 5 yr?
Answer» Question 123 A new born bear weights 4 kg. How many kilograms might a five year old bear weight if its weight increases by the power of 2 in 5 yr?

6.

Question 123 A new born bear weights 4 kg. How many kilograms might a five year old bear weight if its weight increases by the power of 2 in 5 yr?

Answer»

Question 123

A new born bear weights 4 kg. How many kilograms might a five year old bear weight if its weight increases by the power of 2 in 5 yr?

Discussion

7.	Which of the following cases is the object in free fall? 1. An object dropped from a certain height. 2. An object is thrown upward or an object thrown downwards from the top of a tower. 3. An object in the aircraft flying at constant speed. 4. An object in a car accelerating at 9.8 m/s2 on the road.
Answer» Which of the following cases is the object in free fall? 1. An object dropped from a certain height. 2. An object is thrown upward or an object thrown downwards from the top of a tower. 3. An object in the aircraft flying at constant speed. 4. An object in a car accelerating at 9.8 m/s² on the road.

7.

Which of the following cases is the object in free fall? 1. An object dropped from a certain height. 2. An object is thrown upward or an object thrown downwards from the top of a tower. 3. An object in the aircraft flying at constant speed. 4. An object in a car accelerating at 9.8 m/s2 on the road.

Answer»

Which of the following cases is the object in free fall?

1. An object dropped from a certain height.
2. An object is thrown upward or an object thrown downwards from the top of a tower.
3. An object in the aircraft flying at constant speed.
4. An object in a car accelerating at 9.8 m/s² on the road.

Discussion

8.	what is the type of mirror that we used when the image formed is virtual?
Answer» what is the type of mirror that we used when the image formed is virtual?

Discussion

9.	Our earth is in “geod” Shape and our earth is filled with water about 2/3.then why it is not falling down from the earth in the space due to gravitational force.
Answer» Our earth is in “geod” Shape and our earth is filled with water about 2/3.then why it is not falling down from the earth in the space due to gravitational force.

Discussion

10.	Electric charges are measured algebraic. What does that mean?
Answer» Electric charges are measured algebraic. What does that mean?

Discussion

11.	The remaining volume of a glass vessel is constant at all temperatures if 1x of its volume is filled with mercury. The coefficient of volume is filled with mercury. The coefficient of volume expansion of mercury is 7 times that of glass. The value of x should be
Answer» The remaining volume of a glass vessel is constant at all temperatures if $\frac{1}{x}$ of its volume is filled with mercury. The coefficient of volume is filled with mercury. The coefficient of volume expansion of mercury is 7 times that of glass. The value of $x$ should be

Discussion

12.	You are given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?
Answer» You are given one hundred $1 Ω$ resistors. What is the smallest and largest resistance you can make in a circuit using these?

Discussion

13.	In a village named Kowakol in Bihar, there is no electricity. Still, Mr. Darshan Ram uses many electric appliances at his home like TV and Fridge. He is using a device to produce electricity. But Mr. Ram is not able to use electric appliances when the weather is cloudy. What is that device called?
Answer» In a village named Kowakol in Bihar, there is no electricity. Still, Mr. Darshan Ram uses many electric appliances at his home like TV and Fridge. He is using a device to produce electricity. But Mr. Ram is not able to use electric appliances when the weather is cloudy. What is that device called?

Discussion

14.	What is radioactivity
Answer» What is radioactivity

Discussion

15.	A student focused the image of a candle flame placed at 2 m from a convex lens of focal length 10cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen (A) In what direction does he move the lens to focus the flame on the screen? (B) What happens to the size of the image of the flame formed on the screen? (C) What difference is seen in the intensity (brightness) of the image of the flame on the screen? (D) What is seen on the screen when the flame is very close (at about 5cm) to the lens?
Answer» A student focused the image of a candle flame placed at 2 m from a convex lens of focal length 10cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen (A) In what direction does he move the lens to focus the flame on the screen? (B) What happens to the size of the image of the flame formed on the screen? (C) What difference is seen in the intensity (brightness) of the image of the flame on the screen? (D) What is seen on the screen when the flame is very close (at about 5cm) to the lens?

Discussion

16.	How to draw ray diagrams of a convex lens?
Answer» How to draw ray diagrams of a convex lens?

Discussion

17.	ArrageA the following in an increasing oedorof there pH:NaOH solution, blood, lemon juice
Answer» ArrageA the following in an increasing oedorof there pH:NaOH solution, blood, lemon juice

Discussion

18.	At the time of short circuit, the current in the circuit
Answer» At the time of short circuit, the current in the circuit

Discussion

19.	What is the melting point of benzene if ΔHfusion = 9.95 kJ/mol and ΔSfusion = 35.7 J/K − mol?
Answer» What is the melting point of benzene if $Δ H_{f u s i o n} = 9.95 k J / m o l$ and $Δ S_{f u s i o n} = 35.7 J / K - m o l$ ?

Discussion

20.	Can we determine to which side the galvanometer deflects first while current is constant or current is alternating?
Answer» Can we determine to which side the galvanometer deflects first while current is constant or current is alternating?

Discussion

21.	The pH value for pure water (H2O) is 7.0. What do you understand by this?
Answer» The pH value for pure water ( $H_{2} O$ ) is 7.0. What do you understand by this?

Discussion

22.	How does the angle of minimum deviation produced by a prism change with increase in (i) the wavelength of incident light, and (ii) the refracting angle of prism?
Answer» How does the angle of minimum deviation produced by a prism change with increase in (i) the wavelength of incident light, and (ii) the refracting angle of prism?

Discussion

23.	Use the mirror education to deduce that: An object placed between f and 2 f of a concave mirror produces a real image beyond 2f.
Answer» Use the mirror education to deduce that: An object placed between f and 2 f of a concave mirror produces a real image beyond 2f.

Discussion

24.	A wire of length L0 is supplied heat to to raise its temperature by T. If γ is the coefficient of volume ex the wire and Y is the young's modulus of the wire then the energy density stored in the wire is
Answer» A wire of length $L_{0}$ is supplied heat to to raise its temperature by T. If $γ$ is the coefficient of volume ex the wire and Y is the young's modulus of the wire then the energy density stored in the wire is

Discussion

25.	A diverging mirror of radius of curvature 40 cm forms an image which is half the height of the object. Find the object and image positions.
Answer» A diverging mirror of radius of curvature 40 cm forms an image which is half the height of the object. Find the object and image positions.

Discussion

26.	The smaller the focus of a convex lens, more its magnifying capacity, so why don't we use magnifying glasses with very small focal length?
Answer» The smaller the focus of a convex lens, more its magnifying capacity, so why don't we use magnifying glasses with very small focal length?

Discussion

27.	Compare the thickness of secondary coil of a step-up transformer with the primary coil
Answer» Compare the thickness of secondary coil of a step-up transformer with the primary coil

Discussion

28.	Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.
Answer» Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.

Discussion

29.	One harmful effect of radioactivity is:
Answer» One harmful effect of radioactivity is:

Discussion

30.	A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is [IIT 1985]
Answer» A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is [IIT 1985]

Discussion

31.	The fuel having the lowest calorific value is: (a) coal (b) wood (c) charcoal (d) kerosene
Answer» The fuel having the lowest calorific value is: (a) coal (b) wood (c) charcoal (d) kerosene

Discussion

32.	What is the average wind speed required for efficient harnessing of wind energy?
Answer» What is the average wind speed required for efficient harnessing of wind energy?

Discussion

33.	Draw a labelled diagram of a class II lever. Give one example of such a lever.
Answer» Draw a labelled diagram of a class II lever. Give one example of such a lever.

Discussion

34.	Small current in a circuit is detected by
Answer» Small current in a circuit is detected by

Discussion

35.	Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used.
Answer» Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used.

Discussion

36.	Two adjacent walls of a room and the ceiling are made of mirrors. If an object is placed in the room, how many images of it will form, and why? Pls explain in detail...when I'm doing I'm getting 9+1=10 images, but the answer is 7...but how?
Answer» Two adjacent walls of a room and the ceiling are made of mirrors. If an object is placed in the room, how many images of it will form, and why? Pls explain in detail...when I'm doing I'm getting 9+1=10 images, but the answer is 7...but how?

36.

Two adjacent walls of a room and the ceiling are made of mirrors. If an object is placed in the room, how many images of it will form, and why? Pls explain in detail...when I'm doing I'm getting 9+1=10 images, but the answer is 7...but how?

Answer»

Two adjacent walls of a room and the ceiling are made of mirrors. If an object is placed in the room, how many images of it will form, and why?

Pls explain in detail...when I'm doing I'm getting 9+1=10 images, but the answer is 7...but how?

Discussion

37.	what is the working process of solenoid and waht is its contituents ...........
Answer» what is the working process of solenoid and waht is its contituents ...........

Discussion

38.	How does the length of a wire change when it's material is changed to one whose resistivity is three times?
Answer» How does the length of a wire change when it's material is changed to one whose resistivity is three times?

Discussion

39.	A combination of a movable pulley P1 with a fixed pulley P2 is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.
Answer» A combination of a movable pulley P $_{1}$ with a fixed pulley P $_{2}$ is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.

Discussion

40.	Two coaxial solenoids of different radii carry current I in the same direction. Let be the magnetic force on the inner solenoid due to the outer one and be the magnetic force on the outer solenoid due to the inner one. Then:
Answer» Two coaxial solenoids of different radii carry current I in the same direction. Let be the magnetic force on the inner solenoid due to the outer one and be the magnetic force on the outer solenoid due to the inner one. Then:

Discussion

41.	Do a transparent sustace reflects light ? How? As transparent substance refracts light . But we see a transparent substance
Answer» Do a transparent sustace reflects light ? How? As transparent substance refracts light . But we see a transparent substance

41.

Do a transparent sustace reflects light ? How? As transparent substance refracts light . But we see a transparent substance

Answer»

Do a transparent sustace reflects light ? How?

As transparent substance refracts light . But we see a transparent substance

Discussion

42.	A On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam:
Answer» A On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam:

Discussion

43.	A ray of light falling parallel to the principal axis on a convex mirror follows ray number ___ as its path.
Answer» A ray of light falling parallel to the principal axis on a convex mirror follows ray number ___ as its path.

43.

A ray of light falling parallel to the principal axis on a convex mirror follows ray number ___ as its path.

Answer»

A ray of light falling parallel to the principal axis on a convex mirror follows ray number ___ as its path.

Discussion

44.	Which of the following emissions change only the atomic number of a nucleus?
Answer» Which of the following emissions change only the atomic number of a nucleus?

Discussion

45.	During gas to liquid conversion___.
Answer» During gas to liquid conversion___.

Discussion

46.	A block of ice at -10 ∘C is slowly heated and converted to steam at 100 ∘C. Which of the following curves represents the phenomenon correctly?
Answer» A block of ice at - $10^{\circ} C$ is slowly heated and converted to steam at $100^{\circ} C$ . Which of the following curves represents the phenomenon correctly?

Discussion

47.	A bulb rated 240 V, 100 W is connected to a 120 V supply. What can be inferred?
Answer» A bulb rated 240 V, 100 W is connected to a 120 V supply. What can be inferred?

Discussion

48.	An object is placed at a distance of 10 cm from a convex mirror of focal length 5 cm. (i) Draw a ray-diagram showing the formation of image. (ii) State two characteristics of the image formed. (iii) Calculate the distance of the image from mirror.
Answer» An object is placed at a distance of 10 cm from a convex mirror of focal length 5 cm. (i) Draw a ray-diagram showing the formation of image. (ii) State two characteristics of the image formed. (iii) Calculate the distance of the image from mirror.

Discussion

49.	What should the angle between force and displacement be to get the maximum work?
Answer» What should the angle between force and displacement be to get the maximum work?

Discussion

50.	If you hold a coil of wire next to a magnet, no current will flow in the coil. What else is needed to induce a current ?
Answer» If you hold a coil of wire next to a magnet, no current will flow in the coil. What else is needed to induce a current ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is reverberation? How can it be reduced? [3 MARKS]

The dark muscular diaphragm that controls the size of the pupil is the

Question 95 The weight of an object on Moon is 16 of its weight on Earth. If an object weighs 535 kg on Earth. How much would it weigh on the Moon?

A ball, when kept on a spring attains a certain height after it is compressed and released. For which of the following height attained by the ball, maximum of his energy is required to compress the spring?

A 60 m long train moving with constant velocity on a straight level track passes a pole in 5 s, find the speed of the train and the time it will take to cross a 540 m long bridge.

Question 123 A new born bear weights 4 kg. How many kilograms might a five year old bear weight if its weight increases by the power of 2 in 5 yr?

what is the type of mirror that we used when the image formed is virtual?

Our earth is in “geod” Shape and our earth is filled with water about 2/3.then why it is not falling down from the earth in the space due to gravitational force.

Electric charges are measured algebraic. What does that mean?

The remaining volume of a glass vessel is constant at all temperatures if 1x of its volume is filled with mercury. The coefficient of volume is filled with mercury. The coefficient of volume expansion of mercury is 7 times that of glass. The value of x should be

You are given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?

In a village named Kowakol in Bihar, there is no electricity. Still, Mr. Darshan Ram uses many electric appliances at his home like TV and Fridge. He is using a device to produce electricity. But Mr. Ram is not able to use electric appliances when the weather is cloudy. What is that device called?

What is radioactivity

How to draw ray diagrams of a convex lens?

ArrageA the following in an increasing oedorof there pH:NaOH solution, blood, lemon juice

At the time of short circuit, the current in the circuit

What is the melting point of benzene if ΔHfusion = 9.95 kJ/mol and ΔSfusion = 35.7 J/K − mol?

Can we determine to which side the galvanometer deflects first while current is constant or current is alternating?

The pH value for pure water (H2O) is 7.0. What do you understand by this?

How does the angle of minimum deviation produced by a prism change with increase in (i) the wavelength of incident light, and (ii) the refracting angle of prism?

Use the mirror education to deduce that: An object placed between f and 2 f of a concave mirror produces a real image beyond 2f.

A wire of length L0 is supplied heat to to raise its temperature by T. If γ is the coefficient of volume ex the wire and Y is the young's modulus of the wire then the energy density stored in the wire is

A diverging mirror of radius of curvature 40 cm forms an image which is half the height of the object. Find the object and image positions.

The smaller the focus of a convex lens, more its magnifying capacity, so why don't we use magnifying glasses with very small focal length?

Compare the thickness of secondary coil of a step-up transformer with the primary coil

Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.

One harmful effect of radioactivity is:

A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is [IIT 1985]

The fuel having the lowest calorific value is: (a) coal (b) wood (c) charcoal (d) kerosene

What is the average wind speed required for efficient harnessing of wind energy?

Draw a labelled diagram of a class II lever. Give one example of such a lever.

Small current in a circuit is detected by

Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used.

Two adjacent walls of a room and the ceiling are made of mirrors. If an object is placed in the room, how many images of it will form, and why? Pls explain in detail...when I'm doing I'm getting 9+1=10 images, but the answer is 7...but how?

what is the working process of solenoid and waht is its contituents ...........

How does the length of a wire change when it's material is changed to one whose resistivity is three times?

A combination of a movable pulley P1​ with a fixed pulley P2​ is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.

Two coaxial solenoids of different radii carry current I in the same direction. Let be the magnetic force on the inner solenoid due to the outer one and be the magnetic force on the outer solenoid due to the inner one. Then:

Do a transparent sustace reflects light ? How? As transparent substance refracts light . But we see a transparent substance

A On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam:

A ray of light falling parallel to the principal axis on a convex mirror follows ray number ___ as its path.

Which of the following emissions change only the atomic number of a nucleus?

During gas to liquid conversion___.

A block of ice at -10 ∘C is slowly heated and converted to steam at 100 ∘C. Which of the following curves represents the phenomenon correctly?

A bulb rated 240 V, 100 W is connected to a 120 V supply. What can be inferred?

An object is placed at a distance of 10 cm from a convex mirror of focal length 5 cm. (i) Draw a ray-diagram showing the formation of image. (ii) State two characteristics of the image formed. (iii) Calculate the distance of the image from mirror.

What should the angle between force and displacement be to get the maximum work?

If you hold a coil of wire next to a magnet, no current will flow in the coil. What else is needed to induce a current ?

A combination of a movable pulley P1 with a fixed pulley P2 is used for lifting up a load W. If the free end of the string moves through a distance x, find the distance by which the load W is raised.