16569 + Interview Questions in Physics

1.	A convex lens produces a magnification of +5. The object is placed : (a) at focus (b) between f and 2f (c) at less than f (d) beyond 2f
Answer» A convex lens produces a magnification of +5. The object is placed : (a) at focus (b) between f and 2f (c) at less than f (d) beyond 2f

Discussion

2.	The unit of electrical resistance is: (a) ampere (b) volt (c) coulombs (d) ohm
Answer» The unit of electrical resistance is: (a) ampere (b) volt (c) coulombs (d) ohm

Discussion

3.	Light in certain cases may be considered as a stream of particles called "photons". Each photon has a linear momentum hλ where h is the Planck's constant and λ is the wavelength of the light. A beam of light of wavelength λ is incident on a plane mirror at an angle of incidence θ. Calculate the change in the linear momentum of a photon as the beam is reflected by the mirror.
Answer» Light in certain cases may be considered as a stream of particles called "photons". Each photon has a linear momentum $\frac{h}{λ}$ where h is the Planck's constant and $λ$ is the wavelength of the light. A beam of light of wavelength $λ$ is incident on a plane mirror at an angle of incidence $θ$ . Calculate the change in the linear momentum of a photon as the beam is reflected by the mirror.

Discussion

4.	The resistivity of a resistor is 5 Ωm. Its length is 1 m and the area of cross section is 2mm2. Calculate its resistance.
Answer» The resistivity of a resistor is $5 Ω m$ . Its length is $1 m$ and the area of cross section is $2 m m^{2}$ . Calculate its resistance.

Discussion

5.	Sample A containing 100 g of water at 30∘C is mixed with another sample B containing 100 g water at 10∘C. What will be the temperature (T) of the mixture of sample A and B?
Answer» Sample A containing $100 g$ of water at $30^{\circ} C$ is mixed with another sample B containing $100 g$ water at $10^{\circ} C$ . What will be the temperature (T) of the mixture of sample A and B?

Discussion

6.	A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. What is the average speed of the body for the entire journey?
Answer» A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. What is the average speed of the body for the entire journey?

Discussion

7.	An ion X2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.
Answer» An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

Discussion

8.	For the same angle of incidence, the angles of refraction in media P, Q and R are 350, 250, 150 respectively. In which medium will the velocity of light be minimum?
Answer» For the same angle of incidence, the angles of refraction in media P, Q and R are $35^{0}$ , $25^{0}$ , $15^{0}$ respectively. In which medium will the velocity of light be minimum?

Discussion

9.	An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.
Answer» An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.

Discussion

10.	Refractive index of water with respect to air is 4/3 and glass is 3/2.Find refractive index of glass with respect to water.
Answer» Refractive index of water with respect to air is 4/3 and glass is 3/2.Find refractive index of glass with respect to water.

Discussion

11.	What do you mean by equilibrium of a body ?
Answer» What do you mean by equilibrium of a body ?

Discussion

12.	Between which two points of a concave mirror should an object be placed to obtain a magnification of 3?
Answer» Between which two points of a concave mirror should an object be placed to obtain a magnification of 3?

Discussion

13.	Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
Answer» Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

Discussion

14.	When light travels from a rarer to a denser medium, it bends -
Answer» When light travels from a rarer to a denser medium, it bends -

Discussion

15.	In the following circuit, calculate the electric current shown in ammeter, flowing through the 20.5 Ω resistor. 0.36605
Answer» In the following circuit, calculate the electric current shown in ammeter, flowing through the $20.5 Ω$ resistor. 0.36605

Discussion

16.	What is an aperture in the lens?
Answer» What is an aperture in the lens?

Discussion

17.	40 g of ice at 0∘C is used to bring down the temperature of a certain mass of water from 600C to 100C. Find the mass of water used. Given, Sw=4200Jkg−1 ∘C−1 and Lf=336×103jkg−1
Answer» 40 g of ice at 0 $^{\circ} C$ is used to bring down the temperature of a certain mass of water from 60 $^{0} C$ to 10 $^{0} C$ . Find the mass of water used. Given, $S_{w} = 4200 J k g^{- 1}^{\circ} C^{- 1} a n d L_{f} = 336 \times 10^{3} j k g^{- 1}$

Discussion

18.	A solar water heater cannot be used to get hot waer on : (a) a sunny day (b) a cloudy day (c) a hot day (d) a windy day
Answer» A solar water heater cannot be used to get hot waer on : (a) a sunny day (b) a cloudy day (c) a hot day (d) a windy day

Discussion

19.	How to find the nature of the image formed ( I'm all cases ) ?
Answer» How to find the nature of the image formed ( I'm all cases ) ?

Discussion

20.	1)what steps would you take ,if you had to increase the current output of your electrical generator?
Answer» 1)what steps would you take ,if you had to increase the current output of your electrical generator?

Discussion

21.	what is the difference between induced emf and induced current? or both the terms are same?
Answer» what is the difference between induced emf and induced current? or both the terms are same?

Discussion

22.	Calculate the quantity of heat required to rise the temperature of 5k of iron from 303k to 343 k ( specific heat capacity of iron is 460 j/kg k)
Answer» Calculate the quantity of heat required to rise the temperature of 5k of iron from 303k to 343 k ( specific heat capacity of iron is 460 j/kg k)

Discussion

23.	Derive the relationship F = ma, where each symbol has its usual significance.
Answer» Derive the relationship F = ma, where each symbol has its usual significance.

Discussion

24.	A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :
Answer» A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :

Discussion

25.	The size of an image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 13rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
Answer» The size of an image of an object by a mirror having a focal length of 20 cm is observed to be reduced to $\frac{1}{3} r d$ of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?

Discussion

26.	Power of lamp is 80w . Find the energy in joules consumed by it in 5seconds
Answer» Power of lamp is 80w . Find the energy in joules consumed by it in 5seconds

Discussion

27.	Building of dams also cause environmental problems because it leads to the loss of
Answer» Building of dams also cause environmental problems because it leads to the loss of

Discussion

28.	Question 1 State Fleming's left-hand rule.
Answer» Question 1 State Fleming's left-hand rule.

Discussion

29.	Choose the correct option which can represent Snell's law for a given set of media for air and water. Here n, θ represent the refractive index of the medium and the incident angle respectively.
Answer» Choose the correct option which can represent Snell's law for a given set of media for air and water. Here $n, θ$ represent the refractive index of the medium and the incident angle respectively.

Discussion

30.	Explain how a steering wheel rotates with respect to couple.
Answer» Explain how a steering wheel rotates with respect to couple.

Discussion

31.	What are the two defects of eyes in seeing near and far objects called as? Give one correction method for each. [3 MARKS]
Answer» What are the two defects of eyes in seeing near and far objects called as? Give one correction method for each. [3 MARKS]

Discussion

32.	Which type of mirror is used in the torches used at homes or by dentists?
Answer» Which type of mirror is used in the torches used at homes or by dentists?

Discussion

33.	Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 10C.
Answer» Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 1⁰C.

Discussion

34.	Where do magnetic field lines intersect ?
Answer» Where do magnetic field lines intersect ?

Discussion

35.	What are the uses of bio gas?
Answer» What are the uses of bio gas?

Discussion

36.	We use Fleming’s right-hand rule in which of these cases?
Answer» We use Fleming’s right-hand rule in which of these cases?

Discussion

37.	Resistance of a conductor also increases linearly with the temperature. Why and how does this happen?
Answer» Resistance of a conductor also increases linearly with the temperature. Why and how does this happen?

Discussion

38.	An electric heater rated as 220 V and 5A . Calculate the amount of power consumed by the heater and also cost of using the heater for one hour if the cost of one unit is Rs 2.
Answer» An electric heater rated as 220 V and 5A . Calculate the amount of power consumed by the heater and also cost of using the heater for one hour if the cost of one unit is Rs 2.

Discussion

39.	Two isosceles right-angled glass prisms are placed near each other as shown in the following figure: The path of the light ray entering the first isosceles right-angled glass prism till it emerges from the second identical prism is such that
Answer» Two isosceles right-angled glass prisms are placed near each other as shown in the following figure: The path of the light ray entering the first isosceles right-angled glass prism till it emerges from the second identical prism is such that

39.

Two isosceles right-angled glass prisms are placed near each other as shown in the following figure: The path of the light ray entering the first isosceles right-angled glass prism till it emerges from the second identical prism is such that

Answer»

Two isosceles right-angled glass prisms are placed near each other as shown in the following figure:

The path of the light ray entering the first isosceles right-angled glass prism till it emerges from the second identical prism is such that

Discussion

40.	What happens to the power of a bulb if it's broken filament is rejoined and lighted?
Answer» What happens to the power of a bulb if it's broken filament is rejoined and lighted?

Discussion

41.	The preserved traces of living organisms are known as:
Answer» The preserved traces of living organisms are known as:

Discussion

42.	Name two sources of energy which you consider to be non-renewable. Give reason for your choice.
Answer» Name two sources of energy which you consider to be non-renewable. Give reason for your choice.

Discussion

43.	Energy is produced in the sun due to ___.
Answer» Energy is produced in the sun due to ___.

Discussion

44.	Question 15 Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Answer» Question 15 Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

Discussion

45.	A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror ?
Answer» A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror ?

Discussion

46.	The sun sends out coronal mass ejection having charged particles continuously towards the earth at a constant rate of 1.6 C/s throughout the day. Assuming that the sun and earth are maintained at a potential difference of 10,000 volts, find the energy received by India in 5 days. Given India receives 10% of the total energy received by the earth. Assume that India faces the sun 12 hours per day on an average.
Answer» The sun sends out coronal mass ejection having charged particles continuously towards the earth at a constant rate of 1.6 C/s throughout the day. Assuming that the sun and earth are maintained at a potential difference of 10,000 volts, find the energy received by India in 5 days. Given India receives 10% of the total energy received by the earth. Assume that India faces the sun 12 hours per day on an average.

Discussion

47.	What are the advantages and disadvantages of using nuclear fuel for generating electricity ?
Answer» What are the advantages and disadvantages of using nuclear fuel for generating electricity ?

Discussion

48.	The bob of a simple pendulum has imparted a velocity of 5m/s when it is at its mean position. To what maximum vertical height will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air?(Take g=10ms−2 ).
Answer» The bob of a simple pendulum has imparted a velocity of 5m/s when it is at its mean position. To what maximum vertical height will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air?(Take g= $10 m s^{- 2}$ ).

Discussion

49.	What is a lens? Write the differences between concave and convex lenses. [5 MARKS]
Answer» What is a lens? Write the differences between concave and convex lenses. [5 MARKS]

Discussion

50.	What are the limitations of power generation from tidal energy?
Answer» What are the limitations of power generation from tidal energy?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A convex lens produces a magnification of +5. The object is placed : (a) at focus (b) between f and 2f (c) at less than f (d) beyond 2f

The unit of electrical resistance is: (a) ampere (b) volt (c) coulombs (d) ohm

The resistivity of a resistor is 5 Ωm. Its length is 1 m and the area of cross section is 2mm2. Calculate its resistance.

Sample A containing 100 g of water at 30∘C is mixed with another sample B containing 100 g water at 10∘C. What will be the temperature (T) of the mixture of sample A and B?

A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. What is the average speed of the body for the entire journey?

An ion X2+ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

For the same angle of incidence, the angles of refraction in media P, Q and R are 350, 250, 150 respectively. In which medium will the velocity of light be minimum?

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.

Refractive index of water with respect to air is 4/3 and glass is 3/2.Find refractive index of glass with respect to water.

What do you mean by equilibrium of a body ?

Between which two points of a concave mirror should an object be placed to obtain a magnification of 3?

Question 10 Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

When light travels from a rarer to a denser medium, it bends -

In the following circuit, calculate the electric current shown in ammeter, flowing through the 20.5 Ω resistor. 0.36605

What is an aperture in the lens?

40 g of ice at 0∘C is used to bring down the temperature of a certain mass of water from 600C to 100C. Find the mass of water used. Given, Sw=4200Jkg−1 ∘C−1 and Lf=336×103jkg−1

A solar water heater cannot be used to get hot waer on : (a) a sunny day (b) a cloudy day (c) a hot day (d) a windy day

How to find the nature of the image formed ( I'm all cases ) ?

1)what steps would you take ,if you had to increase the current output of your electrical generator?

what is the difference between induced emf and induced current? or both the terms are same?

Calculate the quantity of heat required to rise the temperature of 5k of iron from 303k to 343 k ( specific heat capacity of iron is 460 j/kg k)

Derive the relationship F = ma, where each symbol has its usual significance.

A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :

The size of an image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 13rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?

Power of lamp is 80w . Find the energy in joules consumed by it in 5seconds

Building of dams also cause environmental problems because it leads to the loss of

Question 1 State Fleming's left-hand rule.

Choose the correct option which can represent Snell's law for a given set of media for air and water. Here n, θ represent the refractive index of the medium and the incident angle respectively.

Explain how a steering wheel rotates with respect to couple.

What are the two defects of eyes in seeing near and far objects called as? Give one correction method for each. [3 MARKS]

Which type of mirror is used in the torches used at homes or by dentists?

Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 10C.

Where do magnetic field lines intersect ?

What are the uses of bio gas?

We use Fleming’s right-hand rule in which of these cases?

Resistance of a conductor also increases linearly with the temperature. Why and how does this happen?

An electric heater rated as 220 V and 5A . ​​​​​​Calculate the amount of power consumed by the heater and also cost of using the heater for one hour if the cost of one unit is Rs 2.

Two isosceles right-angled glass prisms are placed near each other as shown in the following figure: The path of the light ray entering the first isosceles right-angled glass prism till it emerges from the second identical prism is such that

What happens to the power of a bulb if it's broken filament is rejoined and lighted?

The preserved traces of living organisms are known as:

Name two sources of energy which you consider to be non-renewable. Give reason for your choice.

Energy is produced in the sun due to ___.

Question 15 Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to an electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror ?

What are the advantages and disadvantages of using nuclear fuel for generating electricity ?

The bob of a simple pendulum has imparted a velocity of 5m/s when it is at its mean position. To what maximum vertical height will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air?(Take g=10ms−2 ).

What is a lens? Write the differences between concave and convex lenses. [5 MARKS]

What are the limitations of power generation from tidal energy?

An electric heater rated as 220 V and 5A . Calculate the amount of power consumed by the heater and also cost of using the heater for one hour if the cost of one unit is Rs 2.