6277 + Interview Questions in Physics Page 117 InterviewSolution

5801.	Describe the process of transfer of heat by convection. Give examples.
Answer» Describe the process of transfer of heat by convection. Give examples.

Discussion

5802.	(a) Why is "Objects in mirror are closer than they appear" written on back and side mirrors of a vehicle? [5 MARKS] (b) The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of the truck parked behind his car. This speed at which the image of the truck appears to approach the driver will be? If the truck is 20m behind the car, after how long will the car crash into the truck?
Answer» (a) Why is "Objects in mirror are closer than they appear" written on back and side mirrors of a vehicle? [5 MARKS] (b) The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of the truck parked behind his car. This speed at which the image of the truck appears to approach the driver will be? If the truck is 20m behind the car, after how long will the car crash into the truck?

Discussion

5803.	What is an antielectron?
Answer» What is an antielectron?

Discussion

5804.	In which of the following case(s) we can say that the object is moving?
Answer» In which of the following case(s) we can say that the object is moving?

Discussion

5805.	Which of the following can be attributed as a point of rapid increase in energy demand?
Answer» Which of the following can be attributed as a point of rapid increase in energy demand?

Discussion

5806.	Question 20 Look at the figure. The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in Figure. Which pin will fall first? Explain.
Answer» Question 20 Look at the figure. The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in Figure. Which pin will fall first? Explain.

5806.

Question 20 Look at the figure. The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in Figure. Which pin will fall first? Explain.

Answer»

Question 20

Look at the figure.

The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in Figure. Which pin will fall first? Explain.

Discussion

5807.	Explain the flow of electrons in a cell.
Answer» Explain the flow of electrons in a cell.

Discussion

5808.	Which of the following materials allow light to pass through it?
Answer» Which of the following materials allow light to pass through it?

Discussion

5809.	In the previous question I asked, I recieved an answer which told me that air needs very very high pressure and very low temperature. A simple situation: When we cook, and open the lid of the container, we see water droplets. But in this case, air has a high pressure but not a cold temperature. So, how does it condense?
Answer» In the previous question I asked, I recieved an answer which told me that air needs very very high pressure and very low temperature. A simple situation: When we cook, and open the lid of the container, we see water droplets. But in this case, air has a high pressure but not a cold temperature. So, how does it condense?

Discussion

5810.	. Explain an example where heat is transferred by all the three means.
Answer» . Explain an example where heat is transferred by all the three means.

Discussion

5811.	Where do we use electromagnets?Explain each usage.
Answer» Where do we use electromagnets?Explain each usage.

Discussion

5812.	Differentiate between virtual and real image.
Answer» Differentiate between virtual and real image.

Discussion

5813.	(a) Distinguish between renewable and non-renewable sources of energy. (b) Choose the renewable sources of energy from the following list: Coal, biogas, sun, natural gas [3 MARKS]
Answer» (a) Distinguish between renewable and non-renewable sources of energy. (b) Choose the renewable sources of energy from the following list: Coal, biogas, sun, natural gas [3 MARKS]

Discussion

5814.	Question 4 Match the following: Column IColumn II(i) Land breeze blows during(a) summer(ii) Sea breeze blows during(b) winter(iii) Dark colored clothes are preferred during(c) day(iv) Light colored clothes are preferred during(d) night
Answer» Question 4 Match the following: $\begin{matrix} C o l u m n I & C o l u m n I I (i) L a n d b r e e z e b l o w s d u r i n g & (a) s u m m e r (i i) S e a b r e e z e b l o w s d u r i n g & (b) w i n t e r (i i i) D a r k c o l o r e d c l o t h e s a r e p r e f e r r e d d u r i n g & (c) d a y (i v) L i g h t c o l o r e d c l o t h e s a r e p r e f e r r e d d u r i n g & (d) n i g h t \end{matrix}$

Discussion

5815.	The Young’s modulus of a wire of length L and radius r is YNm2. If the length and radius are reduced to L2 and r2, then its Young's modulus will be
Answer» The Young’s modulus of a wire of length L and radius r is $\frac{Y N}{m^{2}}$ . If the length and radius are reduced to $\frac{L}{2}$ and $\frac{r}{2}$ , then its Young's modulus will be

Discussion

5816.	Question 5 Find out which letters of the English alphabet in which the image formed by a plane mirror appears exactly like the letter itself. Discuss your findings.
Answer» Question 5 Find out which letters of the English alphabet in which the image formed by a plane mirror appears exactly like the letter itself. Discuss your findings.

Discussion

5817.	Which of the following options correctly defines wind?
Answer» Which of the following options correctly defines wind?

Discussion

5818.	People living in houses which are far from municipal water tanks often find it difficult to get water on the top floor even if it is situated lower than the level of the water tank. This is because:
Answer» People living in houses which are far from municipal water tanks often find it difficult to get water on the top floor even if it is situated lower than the level of the water tank. This is because:

Discussion

5819.	The objects that emit light of their own are called ___.
Answer» The objects that emit light of their own are called ___.

Discussion

5820.	Which type of wave sound is?
Answer» Which type of wave sound is?

Discussion

5821.	Imagine that you are having your favourite juice using a straw. Then which statement is correct?
Answer» Imagine that you are having your favourite juice using a straw. Then which statement is correct?

Discussion

5822.	If the resistance of a circuit is kept the same, and voltage is lowered, the current will:-
Answer» If the resistance of a circuit is kept the same, and voltage is lowered, the current will:-

Discussion

5823.	Name one necessary component of an electric circuit.
Answer» Name one necessary component of an electric circuit.

Discussion

5824.	Mercury is a metal, is it a good conductor of electricity? If not why
Answer» Mercury is a metal, is it a good conductor of electricity? If not why

Discussion

5825.	What is the fastest and the slowest mode of heat transfer? [2 MARKS]
Answer» What is the fastest and the slowest mode of heat transfer? [2 MARKS]

Discussion

5826.	Among the given options, which is the most appropriate mirror that is small in size, but can form a full virtual image of a tall building?
Answer» Among the given options, which is the most appropriate mirror that is small in size, but can form a full virtual image of a tall building?

Discussion

5827.	Classify the following as motion along a straight line, circular or oscillatory motion: a) Motion of our hands while running. b) Motion of a horse pulling a cart on a straight road. c) Motion of a kid in a merry-go-round. d) Motion of a child on a seesaw. e) Motion of the hammer of an electric bell. f) Motion of a train on a straight bridge.
Answer» Classify the following as motion along a straight line, circular or oscillatory motion: a) Motion of our hands while running. b) Motion of a horse pulling a cart on a straight road. c) Motion of a kid in a merry-go-round. d) Motion of a child on a seesaw. e) Motion of the hammer of an electric bell. f) Motion of a train on a straight bridge.

Discussion

5828.	Which of the following is the common characteristic of all moving bodies?
Answer» Which of the following is the common characteristic of all moving bodies?

Discussion

5829.	Why do skis not sink into snow too far ?
Answer» Why do skis not sink into snow too far ?

Discussion

5830.	how placing an iron core in a solenoid increases the strength of an electromagnet?
Answer» how placing an iron core in a solenoid increases the strength of an electromagnet?

Discussion

5831.	A circle and a square are equal in area. The side of the square will be _______.
Answer» A circle and a square are equal in area. The side of the square will be _______.

Discussion

5832.	Explain the laws of the concave and convex mirror.
Answer» Explain the laws of the concave and convex mirror.

Discussion

5833.	Ships and airplanes use what type of compass?
Answer» Ships and airplanes use what type of compass?

Discussion

5834.	Question 8 An image formed by a lens is erect. Such an image could be formed by a (a) convex lens provided the image is smaller than object. (b) concave lens provided the image is smaller than object. (c) concave lens provided the image is larger than object. (d) concave lens provided the image is of the same size.
Answer» Question 8 An image formed by a lens is erect. Such an image could be formed by a (a) convex lens provided the image is smaller than object. (b) concave lens provided the image is smaller than object. (c) concave lens provided the image is larger than object. (d) concave lens provided the image is of the same size.

5834.

Question 8 An image formed by a lens is erect. Such an image could be formed by a (a) convex lens provided the image is smaller than object. (b) concave lens provided the image is smaller than object. (c) concave lens provided the image is larger than object. (d) concave lens provided the image is of the same size.

Answer»

Question 8

An image formed by a lens is erect. Such an image could be formed by a

(a) convex lens provided the image is smaller than object.

(b) concave lens provided the image is smaller than object.

(c) concave lens provided the image is larger than object.

(d) concave lens provided the image is of the same size.

Discussion

5835.	Which of the following magnetic ore, was once used as a primitive compass?
Answer» Which of the following magnetic ore, was once used as a primitive compass?

Discussion

5836.	Volume of a cylinder = 36 cm3, then volume of cone having same height and radius is:
Answer» Volume of a cylinder = 36 cm $^{3}$ , then volume of cone having same height and radius is:

Discussion

5837.	An object of mass 100 g has a volume of 20 cm3. Calculate the density of the object. If the density of water is 1 g/cm3. State whether the object will float or sink in water.
Answer» An object of mass 100 g has a volume of $20 c m^{3}$ . Calculate the density of the object. If the density of water is $1 g / c m^{3}$ . State whether the object will float or sink in water.

Discussion

5838.	What is the full form of LED ? Why are LED bulbs considered energy efficient? Now explain why LED bulbs are preferred over filament bulbs. [5 MARKS]
Answer» What is the full form of LED ? Why are LED bulbs considered energy efficient? Now explain why LED bulbs are preferred over filament bulbs. [5 MARKS]

Discussion

5839.	If an electric switch is off then:
Answer» If an electric switch is off then:

Discussion

5840.	If the angle of incidence is 30∘ then find the unknown angle.
Answer» If the angle of incidence is 30 $^{\circ}$ then find the unknown angle.

5840.

If the angle of incidence is 30∘ then find the unknown angle.

Answer»

If the angle of incidence is 30 $^{\circ}$ then find the unknown angle.

Discussion

5841.	Rhinoceroses communicate with which frequency sound?
Answer» Rhinoceroses communicate with which frequency sound?

Discussion

5842.	The chemical reaction in an electrolytic solution, due to passage of electric current, depends on:
Answer» The chemical reaction in an electrolytic solution, due to passage of electric current, depends on:

Discussion

5843.	Question 12 David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be (i) 3 m (ii) 5 m (iii) 6 m (iv) 8 m
Answer» Question 12 David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be (i) 3 m (ii) 5 m (iii) 6 m (iv) 8 m

Discussion

5844.	How does rotation of the earth gives a circular shape of a cyclone? Why can't be the cyclone in any other shape like square, rectangle,triangle etc.?
Answer» How does rotation of the earth gives a circular shape of a cyclone? Why can't be the cyclone in any other shape like square, rectangle,triangle etc.?

5844.

How does rotation of the earth gives a circular shape of a cyclone? Why can't be the cyclone in any other shape like square, rectangle,triangle etc.?

Answer»

How does rotation of the earth gives a circular shape of a cyclone?

Why can't be the cyclone in any other shape like square, rectangle,triangle etc.?

Discussion

5845.	At which place is land breeze and sea breeze felt strongly?
Answer» At which place is land breeze and sea breeze felt strongly?

Discussion

5846.	Which of the following statements prove the relationship between water levels in the dams and load shedding?
Answer» Which of the following statements prove the relationship between water levels in the dams and load shedding?

5846.

Which of the following statements prove the relationship between water levels in the dams and load shedding?

Answer»

Which of the following statements prove the relationship between water levels in the dams and load shedding?

Discussion

5847.	Unit of g (acceleration due to gravity) is
Answer» Unit of $g$ (acceleration due to gravity) is

Discussion

5848.	What is meant by immaterial? What is immaterial for an electric fuse wire?
Answer» What is meant by immaterial? What is immaterial for an electric fuse wire?

Discussion

5849.	Explain why a substance expands on heating?
Answer» Explain why a substance expands on heating?

Discussion

5850.	Can transparent objects caste a shadow?
Answer» Can transparent objects caste a shadow?

Discussion

Explore topic-wise InterviewSolutions in .

Describe the process of transfer of heat by convection. Give examples.

What is an antielectron?

In which of the following case(s) we can say that the object is moving?

Which of the following can be attributed as a point of rapid increase in energy demand?

Question 20 Look at the figure. The length of wire PQ in case of A is equal to the diameter of the semicircle formed by the wire CDE, in case B. One pin is attached to each wire with the help of wax as shown in Figure. Which pin will fall first? Explain.

Explain the flow of electrons in a cell.

Which of the following materials allow light to pass through it?

. Explain an example where heat is transferred by all the three means.

Where do we use electromagnets?Explain each usage.

Differentiate between virtual and real image.

(a) Distinguish between renewable and non-renewable sources of energy. (b) Choose the renewable sources of energy from the following list: Coal, biogas, sun, natural gas [3 MARKS]

Question 4 Match the following: Column IColumn II(i) Land breeze blows during(a) summer(ii) Sea breeze blows during(b) winter(iii) Dark colored clothes are preferred during(c) day(iv) Light colored clothes are preferred during(d) night

The Young’s modulus of a wire of length L and radius r is YNm2. If the length and radius are reduced to L2 and r2, then its Young's modulus will be

Question 5 Find out which letters of the English alphabet in which the image formed by a plane mirror appears exactly like the letter itself. Discuss your findings.

Which of the following options correctly defines wind?

People living in houses which are far from municipal water tanks often find it difficult to get water on the top floor even if it is situated lower than the level of the water tank. This is because:

The objects that emit light of their own are called ___.

Which type of wave sound is?

Imagine that you are having your favourite juice using a straw. Then which statement is correct?

If the resistance of a circuit is kept the same, and voltage is lowered, the current will:-

Name one necessary component of an electric circuit.

Mercury is a metal, is it a good conductor of electricity? If not why

What is the fastest and the slowest mode of heat transfer? [2 MARKS]

Among the given options, which is the most appropriate mirror that is small in size, but can form a full virtual image of a tall building?

Which of the following is the common characteristic of all moving bodies?

Why do skis not sink into snow too far ?

how placing an iron core in a solenoid increases the strength of an electromagnet?

A circle and a square are equal in area. The side of the square will be _______.

Explain the laws of the concave and convex mirror.

Ships and airplanes use what type of compass?

Which of the following magnetic ore, was once used as a primitive compass?

Volume of a cylinder = 36 cm3, then volume of cone having same height and radius is:

An object of mass 100 g has a volume of 20 cm3. Calculate the density of the object. If the density of water is 1 g/cm3. State whether the object will float or sink in water.

What is the full form of LED ? Why are LED bulbs considered energy efficient? Now explain why LED bulbs are preferred over filament bulbs. [5 MARKS]

If an electric switch is off then:

If the angle of incidence is 30∘ then find the unknown angle.

Rhinoceroses communicate with which frequency sound?

The chemical reaction in an electrolytic solution, due to passage of electric current, depends on:

Question 12 David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be (i) 3 m (ii) 5 m (iii) 6 m (iv) 8 m

How does rotation of the earth gives a circular shape of a cyclone? Why can't be the cyclone in any other shape like square, rectangle,triangle etc.?

At which place is land breeze and sea breeze felt strongly?

Which of the following statements prove the relationship between water levels in the dams and load shedding?

Unit of g (acceleration due to gravity) is

What is meant by immaterial? What is immaterial for an electric fuse wire?

Explain why a substance expands on heating?

Can transparent objects caste a shadow?