16569 + Interview Questions in Physics

1.	Draw a I - V graph for a linear resistor. What does its slope represent?
Answer» Draw a I - V graph for a linear resistor. What does its slope represent?

Discussion

2.	What is Tyndall effect? Do true solutions exhibit Tyndall effect?
Answer» What is Tyndall effect? Do true solutions exhibit Tyndall effect?

Discussion

3.	A person can see an object beyond 1m but not closer than it. The defect of the person is
Answer» A person can see an object beyond 1m but not closer than it. The defect of the person is

Discussion

4.	What what is meant by the statement that a body is having +10C unit charge?
Answer» What what is meant by the statement that a body is having +10C unit charge?

Discussion

5.	Why in a circuit with resistors in - • parallel has potential difference constant in whole circuit but not current. • series has current constant in whole circuit but not potential difference.
Answer» Why in a circuit with resistors in - • parallel has potential difference constant in whole circuit but not current. • series has current constant in whole circuit but not potential difference.

Discussion

6.	What is the mechanical advantage of a single movable pulley in the ideal case?
Answer» What is the mechanical advantage of a single movable pulley in the ideal case?

Discussion

7.	Why is it that AC current can be transported over long distances whereas dc current can't be done so?
Answer» Why is it that AC current can be transported over long distances whereas dc current can't be done so?

Discussion

8.	a) Which type of lens is used in a magnifying glass? b) By drawing a ray diagram, explain the formation of an image by a simple magnifying lens. [5 MARKS]
Answer» a) Which type of lens is used in a magnifying glass? b) By drawing a ray diagram, explain the formation of an image by a simple magnifying lens. [5 MARKS]

Discussion

9.	Electricity is supplied to our houses in two separate circuits as
Answer» Electricity is supplied to our houses in two separate circuits as

Discussion

10.	What is the name of the device which is used to convert mechanical energy into electrical energy?
Answer» What is the name of the device which is used to convert mechanical energy into electrical energy?

Discussion

11.	When the salt is added to water, the surface tension of liquid mixture will
Answer» When the salt is added to water, the surface tension of liquid mixture will

Discussion

12.	Why does a beam of light bend when it enters glass at an angle ? Why does it not bend if it enters the glass at right angles ?
Answer» Why does a beam of light bend when it enters glass at an angle ? Why does it not bend if it enters the glass at right angles ?

Discussion

13.	Distinguish between the terms `overloading' and `short-circuiting' as used in domestic circuits.
Answer» Distinguish between the terms `overloading' and `short-circuiting' as used in domestic circuits.

Discussion

14.	In figure (a) and (b), F1 and F2 are the positions of the two foci of the thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.
Answer» In figure (a) and (b), $F_{1} a n d F_{2}$ are the positions of the two foci of the thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.

14.

In figure (a) and (b), F1 and F2 are the positions of the two foci of the thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.

Answer»

In figure (a) and (b), $F_{1} a n d F_{2}$ are the positions of the two foci of the thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.

Discussion

15.	Which of the following is not derived from the Sun?
Answer» Which of the following is not derived from the Sun?

Discussion

16.	Mention the minimum wind velocity required for obtaining electric power with a wind mill generator
Answer» Mention the minimum wind velocity required for obtaining electric power with a wind mill generator

Discussion

17.	Which of the following is the most likely temperature fo the filament of an electric light bulb when it is working on the normal 220 V supply line?(a) 5000C (b) 15000C (c) 25000C (d) 45000C
Answer» Which of the following is the most likely temperature fo the filament of an electric light bulb when it is working on the normal 220 V supply line? (a) $500^{0} C$ (b) $1500^{0} C$ (c) $2500^{0} C$ (d) $4500^{0} C$

17.

Which of the following is the most likely temperature fo the filament of an electric light bulb when it is working on the normal 220 V supply line?(a) 5000C (b) 15000C (c) 25000C (d) 45000C

Answer»

Which of the following is the most likely temperature fo the filament of an electric light bulb when it is working on the normal 220 V supply line?
(a) $500^{0} C$
(b) $1500^{0} C$
(c) $2500^{0} C$
(d) $4500^{0} C$

Discussion

18.	(a) Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark (i) incident ray (ii) emergent ray, and (iii) angle of deviation. (b) What is a rainbow ? What are the two conditions necessary for the formation of arainbow in the sky ? (c) What acts as tiny prisms in the formation of a rainbow ? (d) Name the process which is involved in the formation of a rainbow. (e) What are the seven colours seeen in a rainbow ?
Answer» (a) Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark (i) incident ray (ii) emergent ray, and (iii) angle of deviation. (b) What is a rainbow ? What are the two conditions necessary for the formation of arainbow in the sky ? (c) What acts as tiny prisms in the formation of a rainbow ? (d) Name the process which is involved in the formation of a rainbow. (e) What are the seven colours seeen in a rainbow ?

Discussion

19.	The radiation produces maximum biological damage is
Answer» The radiation produces maximum biological damage is

Discussion

20.	The focal length of a lens is (i) positive, (ii) negative. In each case, state the kind of lens.
Answer» The focal length of a lens is (i) positive, (ii) negative. In each case, state the kind of lens.

Discussion

21.	Give reasons for the following : (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage. (b) The efficiency of a movable pulley is always less than 100%. (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.
Answer» Give reasons for the following : (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage. (b) The efficiency of a movable pulley is always less than $100 %$ . (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.

21.

Give reasons for the following : (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage. (b) The efficiency of a movable pulley is always less than 100%. (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.

Answer»

Give reasons for the following :

(a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.

(b) The efficiency of a movable pulley is always less than $100 %$ .

(c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys.

(d) The lower block of a block and tackle pulley system must be of negligible weight.

Discussion

22.	In a step down transformer ___.
Answer» In a step down transformer ___.

Discussion

23.	You are conducting an experiment in an elevator that can move on a vertical shaft. A load is hung vertically from the ceiling on a string. The tension in the string is measured to be 10% less than the weight of the load. No other forces are acting on the load. Which of the following statements about elevator are correct?
Answer» You are conducting an experiment in an elevator that can move on a vertical shaft. A load is hung vertically from the ceiling on a string. The tension in the string is measured to be 10% less than the weight of the load. No other forces are acting on the load. Which of the following statements about elevator are correct?

Discussion

24.	What can you say about the magnetic field at the centre of a current carrying cube made of twelve wires?
Answer» What can you say about the magnetic field at the centre of a current carrying cube made of twelve wires?

Discussion

25.	One half of a lens is covered with a black paper. (a) Will this lens produce a complete image of an object? (b) Is there any change in the intensity of the image? (c) Draw a diagram to show the formation of the image by this lens. (d) What will happen if we remove the black paper? [5 MARKS]
Answer» One half of a lens is covered with a black paper. (a) Will this lens produce a complete image of an object? (b) Is there any change in the intensity of the image? (c) Draw a diagram to show the formation of the image by this lens. (d) What will happen if we remove the black paper? [5 MARKS]

Discussion

26.	Transformers are used in ____.
Answer» Transformers are used in ____.

Discussion

27.	The optical prescription for a pair of spectacles is : Right eye : - 3.50 D Left eye : - 4.00 D (a) Are these lenses thinner at the middle or at the edges ? (b) Which lens has a greater focal length ? (c) Which is the weaker eye ?
Answer» The optical prescription for a pair of spectacles is : Right eye : - 3.50 D Left eye : - 4.00 D (a) Are these lenses thinner at the middle or at the edges ? (b) Which lens has a greater focal length ? (c) Which is the weaker eye ?

Discussion

28.	What resistance must be connected in parallel to a 4 Ω resistance to make the effective resistance equal to 2.4 Ω?
Answer» What resistance must be connected in parallel to a $4 Ω$ resistance to make the effective resistance equal to $2.4 Ω$ ?

Discussion

29.	Two bulbs marked 200 W, 250 V, and 100 W, 250 V are joined in series to a 250 V supply. Power consumed in the circuit is______.
Answer» Two bulbs marked 200 W, 250 V, and 100 W, 250 V are joined in series to a 250 V supply. Power consumed in the circuit is______.

Discussion

30.	The diagram below shows a wheel barrow. Calculate the MA of the Wheelbarrow.
Answer» The diagram below shows a wheel barrow. Calculate the MA of the Wheelbarrow.

30.

The diagram below shows a wheel barrow. Calculate the MA of the Wheelbarrow.

Answer»

The diagram below shows a wheel barrow.

Calculate the MA of the Wheelbarrow.

Discussion

31.	What is the ratio of Heat Capacity & Specific Heat Capacity of a body?
Answer» What is the ratio of Heat Capacity & Specific Heat Capacity of a body?

Discussion

32.	A lens forms an image between the object and the lens. (a) Name the lens. (b) Draw a ray diagram to shown the formation of such image. (c) State three characteristics of the image.
Answer» A lens forms an image between the object and the lens. (a) Name the lens. (b) Draw a ray diagram to shown the formation of such image. (c) State three characteristics of the image.

Discussion

33.	How does the deviation produced by a prism depend on (i) the frefractive index of its material, and (ii) the wavelength of incident light.
Answer» How does the deviation produced by a prism depend on (i) the frefractive index of its material, and (ii) the wavelength of incident light.

Discussion

34.	Which of the following statement is true for TIR?
Answer» Which of the following statement is true for TIR?

Discussion

35.	Frequency of a sound wave is defined as the:
Answer» Frequency of a sound wave is defined as the:

Discussion

36.	Who discovered the octet rule?
Answer» Who discovered the octet rule?

Discussion

37.	Radius of a normal human eye ball is?
Answer» Radius of a normal human eye ball is?

Discussion

38.	The object distance (u), image distance (v) and the focal length (f) of a lens are related as:
Answer» The object distance $(u)$ , image distance $(v)$ and the focal length $(f)$ of a lens are related as:

Discussion

39.	Why don't protons in the nucleus repel each other?
Answer» Why don't protons in the nucleus repel each other?

Discussion

40.	Question 23 Why is the colour of the clear sky blue?
Answer» Question 23 Why is the colour of the clear sky blue?

Discussion

41.	Which of the following represents the correct order of energy change in Thermal power stations?
Answer» Which of the following represents the correct order of energy change in Thermal power stations?

Discussion

42.	Question 5 (b) What is the lowest total resistance that can be secured by combinations of four coils of resistance 4Ω,8Ω,12Ω and 24Ω?
Answer» Question 5 (b) What is the lowest total resistance that can be secured by combinations of four coils of resistance $4 Ω, 8 Ω, 12 Ω$ and $24 Ω$ ?

Discussion

43.	The energy of a thermal neutron is about ______
Answer» The energy of a thermal neutron is about ______

Discussion

44.	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

45.	It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm. (i) What should be the range of distance of an object placed in front of the mirror ? (ii) Will the image be smaller or larger than the object. Draw a ray diagram to show the formation of image in this case. (iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror? Draw ray a diagram for this situation to justify your answer. Show the positions of pole, principal focus and the centre of curvature in the above ray diagrams.
Answer» It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm. (i) What should be the range of distance of an object placed in front of the mirror ? (ii) Will the image be smaller or larger than the object. Draw a ray diagram to show the formation of image in this case. (iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror? Draw ray a diagram for this situation to justify your answer. Show the positions of pole, principal focus and the centre of curvature in the above ray diagrams.

Discussion

46.	Write any two applications of biogas.
Answer» Write any two applications of biogas.

Discussion

47.	V1,V2 and V3 are the potential differences across the 1Ω,2Ω and 3Ω resistors and the flow of current is 5 A in a circuit . Which of the following shows the correct values of V1,V2 and V3 measured in volts?
Answer» $V_{1}, V_{2} a n d V_{3}$ are the potential differences across the $1 Ω, 2 Ω a n d 3 Ω$ resistors and the flow of current is 5 A in a circuit . Which of the following shows the correct values of $V_{1}, V_{2} a n d V_{3}$ measured in volts?

Discussion

48.	An iron block of mass 1kg is heated to 300∘C. If it is immersed in 1kg of water at 30∘C, then what will be the change in temperature of water (in ∘C)? [specific heat capacity of iron : 460Jkg−1K−1, water: 4200Jkg−1K−1]
Answer» An iron block of mass $1 k g$ is heated to $300^{\circ} C$ . If it is immersed in $1 k g$ of water at $30^{\circ} C$ , then what will be the change in temperature of water (in $^{\circ} C)$ ? $[$ specific heat capacity of iron : $460 J k g^{- 1} K^{- 1}$ , water: $4200 J k g^{- 1} K^{- 1}]$

Discussion

49.	Describe an activity to show that the colour of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw a ray diagram to show the recombination of the spectrum of white light.
Answer» Describe an activity to show that the colour of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw a ray diagram to show the recombination of the spectrum of white light.

Discussion

50.	Why does the sky appears blue
Answer» Why does the sky appears blue

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Draw a I - V graph for a linear resistor. What does its slope represent?

What is Tyndall effect? Do true solutions exhibit Tyndall effect?

A person can see an object beyond 1m but not closer than it. The defect of the person is

What what is meant by the statement that a body is having +10C unit charge?

Why in a circuit with resistors in - • parallel has potential difference constant in whole circuit but not current. • series has current constant in whole circuit but not potential difference. ​​​​​

What is the mechanical advantage of a single movable pulley in the ideal case?

Why is it that AC current can be transported over long distances whereas dc current can't be done so?

a) Which type of lens is used in a magnifying glass? b) By drawing a ray diagram, explain the formation of an image by a simple magnifying lens. [5 MARKS]

Electricity is supplied to our houses in two separate circuits as

What is the name of the device which is used to convert mechanical energy into electrical energy?

When the salt is added to water, the surface tension of liquid mixture will

Why does a beam of light bend when it enters glass at an angle ? Why does it not bend if it enters the glass at right angles ?

Distinguish between the terms `overloading' and `short-circuiting' as used in domestic circuits.

In figure (a) and (b), F1 and F2 are the positions of the two foci of the thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.

Which of the following is not derived from the Sun?

Mention the minimum wind velocity required for obtaining electric power with a wind mill generator

Which of the following is the most likely temperature fo the filament of an electric light bulb when it is working on the normal 220 V supply line?(a) 5000C (b) 15000C (c) 25000C (d) 45000C

The radiation produces maximum biological damage is

The focal length of a lens is (i) positive, (ii) negative. In each case, state the kind of lens.

In a step down transformer ___.

What can you say about the magnetic field at the centre of a current carrying cube made of twelve wires?

One half of a lens is covered with a black paper. (a) Will this lens produce a complete image of an object? (b) Is there any change in the intensity of the image? (c) Draw a diagram to show the formation of the image by this lens. (d) What will happen if we remove the black paper? [5 MARKS]

Transformers are used in ____.

The optical prescription for a pair of spectacles is : Right eye : - 3.50 D Left eye : - 4.00 D (a) Are these lenses thinner at the middle or at the edges ? (b) Which lens has a greater focal length ? (c) Which is the weaker eye ?

What resistance must be connected in parallel to a 4 Ω resistance to make the effective resistance equal to 2.4 Ω?

Two bulbs marked 200 W, 250 V, and 100 W, 250 V are joined in series to a 250 V supply. Power consumed in the circuit is______.

The diagram below shows a wheel barrow. Calculate the MA of the Wheelbarrow.

What is the ratio of Heat Capacity &amp; Specific Heat Capacity of a body?

A lens forms an image between the object and the lens. (a) Name the lens. (b) Draw a ray diagram to shown the formation of such image. (c) State three characteristics of the image.

How does the deviation produced by a prism depend on (i) the frefractive index of its material, and (ii) the wavelength of incident light.

Which of the following statement is true for TIR?

Frequency of a sound wave is defined as the:

Who discovered the octet rule?

Radius of a normal human eye ball is?

The object distance (u), image distance (v) and the focal length (f) of a lens are related as:

Why don't protons in the nucleus repel each other?

Question 23 Why is the colour of the clear sky blue?

Which of the following represents the correct order of energy change in Thermal power stations?

Question 5 (b) What is the lowest total resistance that can be secured by combinations of four coils of resistance 4Ω,8Ω,12Ω and 24Ω?

The energy of a thermal neutron is about ______

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

Write any two applications of biogas.

V1,V2 and V3 are the potential differences across the 1Ω,2Ω and 3Ω resistors and the flow of current is 5 A in a circuit . Which of the following shows the correct values of V1,V2 and V3 measured in volts?

An iron block of mass 1kg is heated to 300∘C. If it is immersed in 1kg of water at 30∘C, then what will be the change in temperature of water (in ∘C)? [specific heat capacity of iron : 460Jkg−1K−1, water: 4200Jkg−1K−1]

Describe an activity to show that the colour of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw a ray diagram to show the recombination of the spectrum of white light.

Why does the sky appears blue

Why in a circuit with resistors in - • parallel has potential difference constant in whole circuit but not current. • series has current constant in whole circuit but not potential difference.

What is the ratio of Heat Capacity & Specific Heat Capacity of a body?