16569 + Interview Questions in Physics

1.	Differentiate between energy and power.
Answer» Differentiate between energy and power.

Discussion

2.	In the given figure, the galvanometer will not have a deflection if:
Answer» In the given figure, the galvanometer will not have a deflection if:

Discussion

3.	A uniform metee rule rests horizontally on a knife edge at the 60 cm mark when a mass of 10 g is suspended from one end. 1)At which end must this mass be suspended? 2)What is the mass of the rule?
Answer» A uniform metee rule rests horizontally on a knife edge at the 60 cm mark when a mass of 10 g is suspended from one end. 1)At which end must this mass be suspended? 2)What is the mass of the rule?

3.

A uniform metee rule rests horizontally on a knife edge at the 60 cm mark when a mass of 10 g is suspended from one end. 1)At which end must this mass be suspended? 2)What is the mass of the rule?

Answer»

A uniform metee rule rests horizontally on a knife edge at the 60 cm mark when a mass of 10 g is suspended from one end.

1)At which end must this mass be suspended?

2)What is the mass of the rule?

Discussion

4.	Write the energy conversion that takes place in a hydropower plant?
Answer» Write the energy conversion that takes place in a hydropower plant?

Discussion

5.	What is the difference between a solenoid and a coil?
Answer» What is the difference between a solenoid and a coil?

Discussion

6.	Why does resistance of a conductor increase in increasing temperature
Answer» Why does resistance of a conductor increase in increasing temperature

Discussion

7.	Through which of the following primary interface of an eye does the light enter?
Answer» Through which of the following primary interface of an eye does the light enter?

Discussion

8.	When three bulbs are connected in parallel, then what will happen to the glow of other two bulbs if the one bulb get fused ?
Answer» When three bulbs are connected in parallel, then what will happen to the glow of other two bulbs if the one bulb get fused ?

Discussion

9.	In the forward bias arrangement of a PN-junction diode
Answer» In the forward bias arrangement of a PN-junction diode

Discussion

10.	An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power -10D. Find the size of the image.
Answer» An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power -10D. Find the size of the image.

Discussion

11.	Explain the meaning of the statement the current rating of a fuse is 5 A.
Answer» Explain the meaning of the statement the current rating of a fuse is 5 A.

11.

Explain the meaning of the statement the current rating of a fuse is 5 A.

Answer»

Explain the meaning of the statement the current rating of a fuse is 5 A.

Discussion

12.	What is the difference between electric motor and electric generator?
Answer» What is the difference between electric motor and electric generator?

Discussion

13.	A ray of light is incident at 60∘ on glass-air interface. Then the total deviation of the ray is ___ degrees. μg = √2, μa = 1
Answer» A ray of light is incident at $60^{\circ}$ on glass-air interface. Then the total deviation of the ray is ___ degrees. $μ_{g}$ = $\sqrt{2}$ , $μ_{a}$ = 1

13.

A ray of light is incident at 60∘ on glass-air interface. Then the total deviation of the ray is ___ degrees. μg = √2, μa = 1

Answer»

A ray of light is incident at $60^{\circ}$ on glass-air interface. Then the total deviation of the ray is ___ degrees.

$μ_{g}$ = $\sqrt{2}$ , $μ_{a}$ = 1

Discussion

14.	The refractive indices of glass and water with respect to air are 32 and 43 respectively. If the speed of light in glass is 2×108 m/s. Find the speed of light in water.
Answer» The refractive indices of glass and water with respect to air are $\frac{3}{2}$ and $\frac{4}{3}$ respectively. If the speed of light in glass is $2 \times 108 m / s$ . Find the speed of light in water.

Discussion

15.	Shortest path is always the quickest path. Is this statement true or false ? Explain
Answer» Shortest path is always the quickest path. Is this statement true or false ? Explain

Discussion

16.	Calculate the amount of charge that would flow in 2 hours through an element of an electric bulb carrying a current of 0.25A
Answer» Calculate the amount of charge that would flow in $2 h o u r s$ through an element of an electric bulb carrying a current of $0.25 A$

Discussion

17.	The average O-H bond energy with the help of following data is: (1) 2H(g)⟶H2(g) ;ΔH=−435.0 kJ mol−1 (2) O2(g)⟶2O(g) ;ΔH=+ 489.6 kJ mol−1 (3) 12H2(g)+12O2(g)⟶OH ;ΔH=−42.09 kJ mol−1
Answer» The average O-H bond energy with the help of following data is: $(1) 2 H (g) ⟶ H_{2} (g); Δ H = - 435.0 {kJ mol}^{- 1}$ $(2) O_{2} (g) ⟶ 2 O (g); Δ H = + 489.6 {kJ mol}^{- 1}$ $(3) \frac{1}{2} H_{2} (g) + \frac{1}{2} O_{2} (g) ⟶ O H; Δ H = - 42.09 {kJ mol}^{- 1}$

Discussion

18.	Why the sun looks red in morning and orange in evening and sky looks blue
Answer» Why the sun looks red in morning and orange in evening and sky looks blue

Discussion

19.	Why is it advised to clean the ends of connecting wires before connecting them in an electric circuit
Answer» Why is it advised to clean the ends of connecting wires before connecting them in an electric circuit

Discussion

20.	Define ozone layer.
Answer» Define ozone layer.

Discussion

21.	Why does the potential difference vary across resistors in series connection?
Answer» Why does the potential difference vary across resistors in series connection?

Discussion

22.	Define temperature and name its S.I.unit.
Answer» Define temperature and name its S.I.unit.

Discussion

23.	The SI Unit of resistivity is___
Answer» The SI Unit of resistivity is___

Discussion

24.	What is variable resistance ? Explain with real life example.
Answer» What is variable resistance ? Explain with real life example.

Discussion

25.	why actually sky is blue? If dispersed blue ray is hitting ground then why we can't see that blue colour on ground?
Answer» why actually sky is blue? If dispersed blue ray is hitting ground then why we can't see that blue colour on ground?

Discussion

26.	The Radioactivity of an element when it undergoes a chemical change to form a chemical compound
Answer» The Radioactivity of an element when it undergoes a chemical change to form a chemical compound

Discussion

27.	How does the deviation produced by a triangular prism depend on the colour (or wavelength) of light incident on it ?
Answer» How does the deviation produced by a triangular prism depend on the colour (or wavelength) of light incident on it ?

Discussion

28.	A boy placed a magnet into iron fillings and observed that the maximum amount of iron fillings accumulated at
Answer» A boy placed a magnet into iron fillings and observed that the maximum amount of iron fillings accumulated at

Discussion

29.	The volume of a certain mass of gas is 750 mL at −3∘C. The gas is heated at constant pressure and its volume becomes 1 L. What is the final temperature of the gas?
Answer» The volume of a certain mass of gas is 750 mL at $- 3^{\circ}$ C. The gas is heated at constant pressure and its volume becomes 1 L. What is the final temperature of the gas?

Discussion

30.	How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field ?
Answer» How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field ?

Discussion

31.	We understand 'temperature' as a measure of the 'hotness' or 'coldness' of a body. Which of these properties do you think explicitly depend on the temperature?
Answer» We understand 'temperature' as a measure of the 'hotness' or 'coldness' of a body. Which of these properties do you think explicitly depend on the temperature?

Discussion

32.	A neutron dissociates into a proton and an electron along with an anti-neutrino, in ______ emission.
Answer» A neutron dissociates into a proton and an electron along with an anti-neutrino, in ______ emission.

Discussion

33.	State the advantages and disadvantages of using solar cells.
Answer» State the advantages and disadvantages of using solar cells.

Discussion

34.	We have a copper wire resistance R this wire is pulled so it's length get double find the new resistance in term of original resistance.
Answer» We have a copper wire resistance R this wire is pulled so it's length get double find the new resistance in term of original resistance.

Discussion

35.	Which of the two is scattered more easily : light of shorter wavelengths or light of longer wavelengths ?
Answer» Which of the two is scattered more easily : light of shorter wavelengths or light of longer wavelengths ?

Discussion

36.	Which part of the bi-focal lens should a person use to read? And why?
Answer» Which part of the bi-focal lens should a person use to read? And why?

Discussion

37.	What is the speciality of a power generator?
Answer» What is the speciality of a power generator?

Discussion

38.	A body of mass 2 kg is dropped from a building of height 5 m. The maximum kinetic energy the body can attain is ___ J.
Answer» A body of mass 2 kg is dropped from a building of height 5 m. The maximum kinetic energy the body can attain is ___ J.

Discussion

39.	The RMS value of the electric field of the light coming from the sun is 720NC-1. The average total energy density of the electromagnetic wave is:4.58×10-6Jm-36.37×10-9Jm-381.35×10-12Jm-33.3×10-3Jm-3
Answer» The RMS value of the electric field of the light coming from the sun is $720 N C^{- 1}$ . The average total energy density of the electromagnetic wave is: $4.58 \times 10^{- 6} J m^{- 3}$ $6.37 \times 10^{- 9} J m^{- 3}$ $81.35 \times 10^{- 12} J m^{- 3}$ $3.3 \times 10^{- 3} J m^{- 3}$

39.

The RMS value of the electric field of the light coming from the sun is 720NC-1. The average total energy density of the electromagnetic wave is:4.58×10-6Jm-36.37×10-9Jm-381.35×10-12Jm-33.3×10-3Jm-3

Answer»

The RMS value of the electric field of the light coming from the sun is $720 N C^{- 1}$ . The average total energy density of the electromagnetic wave is:

$4.58 \times 10^{- 6} J m^{- 3}$
$6.37 \times 10^{- 9} J m^{- 3}$
$81.35 \times 10^{- 12} J m^{- 3}$
$3.3 \times 10^{- 3} J m^{- 3}$

Discussion

40.	(a) What happens when a ray of ordinary light is passed through a triangular glass prism ? (b) What will happen if another similar glass prism is placed upside down behind the first prism ?
Answer» (a) What happens when a ray of ordinary light is passed through a triangular glass prism ? (b) What will happen if another similar glass prism is placed upside down behind the first prism ?

Discussion

41.	How is the refractive index of a medium related to the real and apparent depths of an object in that medium?
Answer» How is the refractive index of a medium related to the real and apparent depths of an object in that medium?

Discussion

42.	A spinning wheel A is brought in contact with another wheel B which is initially at rest. Because of the friction at contact, the second wheel also starts spinning, then which of the following energies of B won't change?
Answer» A spinning wheel A is brought in contact with another wheel B which is initially at rest. Because of the friction at contact, the second wheel also starts spinning, then which of the following energies of B won't change?

Discussion

43.	Two different metal rods of the same length have their ends kept at the same temperatures θ1 and θ2 with θ2 > θ1. If A1 and A2 are their cross-sectional areas and k1 and k2 their thermal conductivities, the rate of heat flow in the two rods will be same if
Answer» Two different metal rods of the same length have their ends kept at the same temperatures $θ_{1}$ and $θ_{2}$ with $θ_{2}$ > $θ_{1}$ . If $A_{1}$ and $A_{2}$ are their cross-sectional areas and $k_{1}$ and $k_{2}$ their thermal conductivities, the rate of heat flow in the two rods will be same if

Discussion

44.	Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
Answer» Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?

Discussion

45.	If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed ?
Answer» If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed ?

Discussion

46.	Q1. Consider the following statements: 1. Ozone is a greenhouse gas which is a key component of smog. 2. Ethane and propane escape into the air from leaks during natural gas extraction and distribution. Which of the above statements are correct?
Answer» Q1. Consider the following statements: 1. Ozone is a greenhouse gas which is a key component of smog. 2. Ethane and propane escape into the air from leaks during natural gas extraction and distribution. Which of the above statements are correct?

46.

Q1. Consider the following statements: 1. Ozone is a greenhouse gas which is a key component of smog. 2. Ethane and propane escape into the air from leaks during natural gas extraction and distribution. Which of the above statements are correct?

Answer»

Q1. Consider the following statements:

1. Ozone is a greenhouse gas which is a key component of smog.

2. Ethane and propane escape into the air from leaks during natural gas extraction and distribution.

Which of the above statements are correct?

Discussion

47.	An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They each change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows. ABCD1 and 22 and 41 and 33 and 4 In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?
Answer» An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They each change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows. $\begin{matrix} A & B & C & D 1 a n d 2 & 2 a n d 4 & 1 a n d 3 & 3 a n d 4 \end{matrix}$ In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?

47.

An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They each change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows. ABCD1 and 22 and 41 and 33 and 4 In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?

Answer»

An electrical circuit for a set of 4 lights depends on a system of switches A, B, C and D. When these switches work they have the following effect on the lights: They each change the state of two lights (i.e. on becomes off and off becomes on). The lights that each switch controls are as follows.
$\begin{matrix} A & B & C & D 1 a n d 2 & 2 a n d 4 & 1 a n d 3 & 3 a n d 4 \end{matrix}$

In configuration 1 shown below, switches CBDA are activated in turn, resulting in configuration 2. One switch did not work and had no effect at all. Which was that switch?

Discussion

48.	Which of the following does not belong to the group? Fahrenheit, Celsius, Joule, Kelvin
Answer» Which of the following does not belong to the group? Fahrenheit, Celsius, Joule, Kelvin

48.

Which of the following does not belong to the group? Fahrenheit, Celsius, Joule, Kelvin

Answer»

Which of the following does not belong to the group?

Fahrenheit, Celsius, Joule, Kelvin

Discussion

49.	The value of universal gas constant is
Answer» The value of universal gas constant is

Discussion

50.	Explain the concepts of current, voltage, resistance, potential difference and ohm's law.
Answer» Explain the concepts of current, voltage, resistance, potential difference and ohm's law.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Differentiate between energy and power.

In the given figure, the galvanometer will not have a deflection if:​

A uniform metee rule rests horizontally on a knife edge at the 60 cm mark when a mass of 10 g is suspended from one end. 1)At which end must this mass be suspended? 2)What is the mass of the rule?

Write the energy conversion that takes place in a hydropower plant?

What is the difference between a solenoid and a coil?

Why does resistance of a conductor increase in increasing temperature

Through which of the following primary interface of an eye does the light enter?

When three bulbs are connected in parallel, then what will happen to the glow of other two bulbs if the one bulb get fused ?

In the forward bias arrangement of a PN-junction diode

An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power -10D. Find the size of the image.

Explain the meaning of the statement the current rating of a fuse is 5 A.

What is the difference between electric motor and electric generator?

A ray of light is incident at 60∘ on glass-air interface. Then the total deviation of the ray is ___ degrees. μg = √2, μa = 1

The refractive indices of glass and water with respect to air are 32 and 43 respectively. If the speed of light in glass is 2×108 m/s. Find the speed of light in water.

Shortest path is always the quickest path. Is this statement true or false ? Explain

Calculate the amount of charge that would flow in 2 hours through an element of an electric bulb carrying a current of 0.25A

The average O-H bond energy with the help of following data is: (1) 2H(g)⟶H2(g) ;ΔH=−435.0 kJ mol−1 (2) O2(g)⟶2O(g) ;ΔH=+ 489.6 kJ mol−1 (3) 12H2(g)+12O2(g)⟶OH ;ΔH=−42.09 kJ mol−1

Why the sun looks red in morning and orange in evening and sky looks blue

Why is it advised to clean the ends of connecting wires before connecting them in an electric circuit

Define ozone layer.

Why does the potential difference vary across resistors in series connection?

Define temperature and name its S.I.unit.

The SI Unit of resistivity is___

What is variable resistance ? Explain with real life example. ​​​​​​

why actually sky is blue? If dispersed blue ray is hitting ground then why we can't see that blue colour on ground?

The Radioactivity of an element when it undergoes a chemical change to form a chemical compound

How does the deviation produced by a triangular prism depend on the colour (or wavelength) of light incident on it ?

A boy placed a magnet into iron fillings and observed that the maximum amount of iron fillings accumulated at

The volume of a certain mass of gas is 750 mL at −3∘C. The gas is heated at constant pressure and its volume becomes 1 L. What is the final temperature of the gas?

How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field ?

We understand 'temperature' as a measure of the 'hotness' or 'coldness' of a body. Which of these properties do you think explicitly depend on the temperature?

A neutron dissociates into a proton and an electron along with an anti-neutrino, in ______ emission.

State the advantages and disadvantages of using solar cells.

We have a copper wire resistance R this wire is pulled so it's length get double find the new resistance in term of original resistance.

Which of the two is scattered more easily : light of shorter wavelengths or light of longer wavelengths ?

Which part of the bi-focal lens should a person use to read? And why?

What is the speciality of a power generator?

A body of mass 2 kg is dropped from a building of height 5 m. The maximum kinetic energy the body can attain is ___ J.

The RMS value of the electric field of the light coming from the sun is 720NC-1. The average total energy density of the electromagnetic wave is:4.58×10-6Jm-36.37×10-9Jm-381.35×10-12Jm-33.3×10-3Jm-3

(a) What happens when a ray of ordinary light is passed through a triangular glass prism ? (b) What will happen if another similar glass prism is placed upside down behind the first prism ?

How is the refractive index of a medium related to the real and apparent depths of an object in that medium?

A spinning wheel A is brought in contact with another wheel B which is initially at rest. Because of the friction at contact, the second wheel also starts spinning, then which of the following energies of B won't change?

Two different metal rods of the same length have their ends kept at the same temperatures θ1 and θ2 with θ2 &gt; θ1. If A1 and A2 are their cross-sectional areas and k1 and k2 their thermal conductivities, the rate of heat flow in the two rods will be same if

Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?

If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed ?

Q1. Consider the following statements: 1. Ozone is a greenhouse gas which is a key component of smog. 2. Ethane and propane escape into the air from leaks during natural gas extraction and distribution. Which of the above statements are correct?

Which of the following does not belong to the group? Fahrenheit, Celsius, Joule, Kelvin

The value of universal gas constant is

Explain the concepts of current, voltage, resistance, potential difference and ohm's law.

In the given figure, the galvanometer will not have a deflection if:

What is variable resistance ? Explain with real life example.

Two different metal rods of the same length have their ends kept at the same temperatures θ1 and θ2 with θ2 > θ1. If A1 and A2 are their cross-sectional areas and k1 and k2 their thermal conductivities, the rate of heat flow in the two rods will be same if