16569 + Interview Questions in Physics

1.	When glass prism of refracting angle 60∘ is immersed in a liquid, its angle of minimum deviation is 30∘. The critical angle of glass with respect to the liquid medium is:
Answer» When glass prism of refracting angle $60^{\circ}$ is immersed in a liquid, its angle of minimum deviation is $30^{\circ}$ . The critical angle of glass with respect to the liquid medium is:

Discussion

2.	The unit of electric power is___.
Answer» The unit of electric power is___.

Discussion

3.	Draw a ray diagram to show how a converging lens can form an image of the sum. Hence give a reason for the term 'burning glass' for a converging lens used in this manner.
Answer» Draw a ray diagram to show how a converging lens can form an image of the sum. Hence give a reason for the term 'burning glass' for a converging lens used in this manner.

Discussion

4.	If half the portion of a convex lens is covered, the focal length ..................... change, but intensity of image..................
Answer» If half the portion of a convex lens is covered, the focal length ..................... change, but intensity of image..................

Discussion

5.	Give the range of wavelength of the electromagnetic waves visible to us.
Answer» Give the range of wavelength of the electromagnetic waves visible to us.

Discussion

6.	The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.
Answer» The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.

6.

The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.

Answer»

The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.

Discussion

7.	Even though wireless transmission of electricity is available, isn't it very inefficient and energy consuming ( considering the induced current is far lower than desired current .) ? Then how would it be used in industries in such a large scale with such large magnitude of power wastage?
Answer» Even though wireless transmission of electricity is available, isn't it very inefficient and energy consuming ( considering the induced current is far lower than desired current .) ? Then how would it be used in industries in such a large scale with such large magnitude of power wastage?

Discussion

8.	Question 130 The moon is about 384000 km from earth and its path around the earth is nearly circular. Find the length of the path described by moon in one complete revolution. (Take,π=3.14)
Answer» Question 130 The moon is about 384000 km from earth and its path around the earth is nearly circular. Find the length of the path described by moon in one complete revolution. (Take, $π = 3.14$ )

8.

Question 130 The moon is about 384000 km from earth and its path around the earth is nearly circular. Find the length of the path described by moon in one complete revolution. (Take,π=3.14)

Answer»

Question 130

The moon is about 384000 km from earth and its path around the earth is nearly circular. Find the length of the path described by moon in one complete revolution. (Take, $π = 3.14$ )

Discussion

9.	If the near point of a far-sighted eye is 1 m, what is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)
Answer» If the near point of a far-sighted eye is $1 m$ , what is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is $25 c m$ )

Discussion

10.	A uniform half metre rule can be balanced at the 29-0 cm mark when a mass 20 g is hung from its one end. (a) Draw a diagram of the arrangement. (b) Find the mass of the half metre rule.
Answer» A uniform half metre rule can be balanced at the 29-0 cm mark when a mass 20 g is hung from its one end. (a) Draw a diagram of the arrangement. (b) Find the mass of the half metre rule.

10.

A uniform half metre rule can be balanced at the 29-0 cm mark when a mass 20 g is hung from its one end. (a) Draw a diagram of the arrangement. (b) Find the mass of the half metre rule.

Answer»

A uniform half metre rule can be balanced at the 29-0 cm mark when a mass 20 g is hung from its one end.

(a) Draw a diagram of the arrangement.

(b) Find the mass of the half metre rule.

Discussion

11.	When four hydrogen nuclei combine to form a helium nucleus at the core of our Sun, about 0.01643 a.m.u. of mass is lost, what is the amount of energy released in MeV in the process?15.296
Answer» When four hydrogen nuclei combine to form a helium nucleus at the core of our Sun, about $0.01643$ a.m.u. of mass is lost, what is the amount of energy released in MeV in the process? 15.296

Discussion

12.	If an object is rotating freely in space on its axis and suddenly its axis tilt changes then what will be the effect on its angular velocity or speed? Explain.
Answer» If an object is rotating freely in space on its axis and suddenly its axis tilt changes then what will be the effect on its angular velocity or speed? Explain.

Discussion

13.	In mutual induction, there is ___.
Answer» In mutual induction, there is ___.

Discussion

14.	Which of the following is/are NOT true about the parallel connection?
Answer» Which of the following is/are NOT true about the parallel connection?

Discussion

15.	In a house two 60 Watt bulbs are lighted for 4 hours, and three 100 watt bulbs for 5 hours everyday. calculate the electric energy consumed in 30 days. plz tell me that 30 days will be changed to hour or not
Answer» In a house two 60 Watt bulbs are lighted for 4 hours, and three 100 watt bulbs for 5 hours everyday. calculate the electric energy consumed in 30 days. plz tell me that 30 days will be changed to hour or not

15.

In a house two 60 Watt bulbs are lighted for 4 hours, and three 100 watt bulbs for 5 hours everyday. calculate the electric energy consumed in 30 days. plz tell me that 30 days will be changed to hour or not

Answer»

In a house two 60 Watt bulbs are lighted for 4 hours, and three 100 watt bulbs for 5 hours everyday. calculate the electric energy consumed in 30 days.

plz tell me that 30 days will be changed to hour or not

Discussion

16.	What is the difference between overloading and short circuit in domestic electri circuit?
Answer» What is the difference between overloading and short circuit in domestic electri circuit?

Discussion

17.	Is the nutrient in the top layer ,bottom layer, middle layer of water bodies different? If so why?
Answer» Is the nutrient in the top layer ,bottom layer, middle layer of water bodies different? If so why?

Discussion

18.	Since action and reaction forces are always equal and opposite, how can motion then take place?
Answer» Since action and reaction forces are always equal and opposite, how can motion then take place?

Discussion

19.	If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:
Answer» If the current I through a resistor is increased by $100 %$ (assume that temperature remains unchanged), the increase in power dissipated will be:

Discussion

20.	The image formed by a concave mirror is virtual, erect and magnified. The position of object is : (a) at focus (b) between focus and centre of curvature (c) at pole (d) between pole and focus
Answer» The image formed by a concave mirror is virtual, erect and magnified. The position of object is : (a) at focus (b) between focus and centre of curvature (c) at pole (d) between pole and focus

Discussion

21.	As we know the two glass rods become charged when rubbed with a silk cloth, it would be safe to conclude that they acquire ___ charges.
Answer» As we know the two glass rods become charged when rubbed with a silk cloth, it would be safe to conclude that they acquire ___ charges.

Discussion

22.	State the energy conversion and name the phenomenon which takes place when a magnet is moved inside a coil having a galvanometer at its end
Answer» State the energy conversion and name the phenomenon which takes place when a magnet is moved inside a coil having a galvanometer at its end

Discussion

23.	Find the voltmeter and ammeter reading in the above circuit.
Answer» Find the voltmeter and ammeter reading in the above circuit.

23.

Find the voltmeter and ammeter reading in the above circuit.

Answer»

Find the voltmeter and ammeter reading in the above circuit.

Discussion

24.	A person got his eyes tested. The optician's prescription for the spectacles reads : Left eye : - 3.00 D Right eye : - 3.50 D The person is having a defect of vision called : (a) presbyopia (b) myopia (c) astigmatism (d) hypermetropia
Answer» A person got his eyes tested. The optician's prescription for the spectacles reads : Left eye : - 3.00 D Right eye : - 3.50 D The person is having a defect of vision called : (a) presbyopia (b) myopia (c) astigmatism (d) hypermetropia

Discussion

25.	Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance?
Answer» Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance?

Discussion

26.	If two points are maintained at 5V each and a resistor of 10 ohms is connected across them, what is the current across them?
Answer» If two points are maintained at 5V each and a resistor of 10 ohms is connected across them, what is the current across them?

Discussion

27.	One litre of a gas at 10∘C is heated till both its volume and pressure are tripled. Find the new temperature.
Answer» One litre of a gas at $10^{\circ} C$ is heated till both its volume and pressure are tripled. Find the new temperature.

Discussion

28.	The rise of sea-water during high tide is caused by the gravitational pull of the: (a) Sun (b) Earth (c) Moon (d) Mars
Answer» The rise of sea-water during high tide is caused by the gravitational pull of the: (a) Sun (b) Earth (c) Moon (d) Mars

Discussion

29.	Which component of biogas is used as a fuel ?
Answer» Which component of biogas is used as a fuel ?

Discussion

30.	Relate the image distance (v), object distance (u) , image height (h′) and object height (h) to the formula of magnification (M) for a mirror.
Answer» Relate the image distance ( $v$ ), object distance ( $u$ ) , image height ( $h^{^{'}}$ ) and object height ( $h$ ) to the formula of magnification $(M)$ for a mirror.

Discussion

31.	What is the unit of Velocity Ratio?
Answer» What is the unit of Velocity Ratio?

Discussion

32.	When the electric current increases, does the resistance increases or decrease?
Answer» When the electric current increases, does the resistance increases or decrease?

Discussion

33.	A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then
Answer» A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

Discussion

34.	What is an ohmic resistor ? Give one example of an ohmic resistor. Draw a graph to show its current-voltage relationship. How is the resistance of the resistor determined from this graph?
Answer» What is an ohmic resistor ? Give one example of an ohmic resistor. Draw a graph to show its current-voltage relationship. How is the resistance of the resistor determined from this graph?

Discussion

35.	When a troop crosses a suspension bridge, the soldiers are asked to break their steps. Why?
Answer» When a troop crosses a suspension bridge, the soldiers are asked to break their steps. Why?

Discussion

36.	What is the advantage of using a convex mirror as a rear-view mirror in vehicles as compared to a plane mirror ? Illustrate your answer with the help of labelled diagrams.
Answer» What is the advantage of using a convex mirror as a rear-view mirror in vehicles as compared to a plane mirror ? Illustrate your answer with the help of labelled diagrams.

Discussion

37.	Which of the following is not a natural resource? (a) soil (b) water (c) electricity (d) natural gas
Answer» Which of the following is not a natural resource? (a) soil (b) water (c) electricity (d) natural gas

Discussion

38.	The SI unit of impulse is:
Answer» The SI unit of impulse is:

Discussion

39.	___ turbines are used for the generation of electricity in thermal power plants.
Answer» ___ turbines are used for the generation of electricity in thermal power plants.

Discussion

40.	If a magnification of, -1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed: (a) between pole and focus (b) at the centre of curvature (c) beyind the centre of curvature (d) at infinity
Answer» If a magnification of, -1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed: (a) between pole and focus (b) at the centre of curvature (c) beyind the centre of curvature (d) at infinity

Discussion

41.	Two bodies A and B in space are attracting each other due to gravitational force. The force of attraction on B due to A is ___ to the force of attraction due to A on B.
Answer» Two bodies A and B in space are attracting each other due to gravitational force. The force of attraction on B due to A is ___ to the force of attraction due to A on B.

Discussion

42.	A student obtained a sharp image of a lighted candle on a screen using convex lens. Now he wants to focus a distant lamp on a far away electric pole in which direction should the lens be moved for this purpose with respect to the screen , to get a sharp image on the screen. Justify your answer
Answer» A student obtained a sharp image of a lighted candle on a screen using convex lens. Now he wants to focus a distant lamp on a far away electric pole in which direction should the lens be moved for this purpose with respect to the screen , to get a sharp image on the screen. Justify your answer

Discussion

43.	Which electric heating devices in your home do you think have resistors which control the flow of electricity?
Answer» Which electric heating devices in your home do you think have resistors which control the flow of electricity?

Discussion

44.	Calculate the work done by a man to lift a luggage of 10 kg from the ground to a height of 1.7 m above the ground. Take (g=9.8 m/s2)
Answer» Calculate the work done by a man to lift a luggage of 10 kg from the ground to a height of 1.7 m above the ground. Take ( $g = 9.8 m / s^{2}$ )

Discussion

45.	State the condition for total internal reflection.
Answer» State the condition for total internal reflection.

Discussion

46.	Question 2 If the key in the arrangement (Figure) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are (a) concentric circles (b) elliptical in shape (c) straight lines parallel to each other (d) concentric circles near the point O but of elliptical shapes as we go away from it
Answer» Question 2 If the key in the arrangement (Figure) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are (a) concentric circles (b) elliptical in shape (c) straight lines parallel to each other (d) concentric circles near the point O but of elliptical shapes as we go away from it

Discussion

47.	Which among these contract on melting?
Answer» Which among these contract on melting?

Discussion

48.	What is the mirror formula? Please explain in detail along with some examples.
Answer» What is the mirror formula? Please explain in detail along with some examples.

48.

What is the mirror formula? Please explain in detail along with some examples.

Answer»

What is the mirror formula?

Please explain in detail along with some examples.

Discussion

49.	Select the meaning of the given phrases/idioms: To have an axe to grind.
Answer» Select the meaning of the given phrases/idioms: To have an axe to grind.

Discussion

50.	A screw gauge with a least count of 0.01 mm is used to measure the diameter of a lead shot. The reading on the pitch scale is found to be 1 mm and the reading on the head scale is 40 divisions. If the screw gauge has a zero error of – 0.05 mm, what is the surface area of the lead shot?
Answer» A screw gauge with a least count of 0.01 mm is used to measure the diameter of a lead shot. The reading on the pitch scale is found to be 1 mm and the reading on the head scale is 40 divisions. If the screw gauge has a zero error of – 0.05 mm, what is the surface area of the lead shot?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

When glass prism of refracting angle 60∘ is immersed in a liquid, its angle of minimum deviation is 30∘. The critical angle of glass with respect to the liquid medium is:

The unit of electric power is___.

Draw a ray diagram to show how a converging lens can form an image of the sum. Hence give a reason for the term 'burning glass' for a converging lens used in this manner.

If half the portion of a convex lens is covered, the focal length ..................... change, but intensity of image..................

Give the range of wavelength of the electromagnetic waves visible to us.

The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.

Even though wireless transmission of electricity is available, isn't it very inefficient and energy consuming ( considering the induced current is far lower than desired current .) ? Then how would it be used in industries in such a large scale with such large magnitude of power wastage?

Question 130 The moon is about 384000 km from earth and its path around the earth is nearly circular. Find the length of the path described by moon in one complete revolution. (Take,π=3.14)

If the near point of a far-sighted eye is 1 m, what is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye is 25 cm)

A uniform half metre rule can be balanced at the 29-0 cm mark when a mass 20 g is hung from its one end. (a) Draw a diagram of the arrangement. (b) Find the mass of the half metre rule.

When four hydrogen nuclei combine to form a helium nucleus at the core of our Sun, about 0.01643 a.m.u. of mass is lost, what is the amount of energy released in MeV in the process?15.296

If an object is rotating freely in space on its axis and suddenly its axis tilt changes then what will be the effect on its angular velocity or speed? Explain.

In mutual induction, there is ___.

Which of the following is/are NOT true about the parallel connection?

In a house two 60 Watt bulbs are lighted for 4 hours, and three 100 watt bulbs for 5 hours everyday. calculate the electric energy consumed in 30 days. plz tell me that 30 days will be changed to hour or not

What is the difference between overloading and short circuit in domestic electri circuit?

Is the nutrient in the top layer ,bottom layer, middle layer of water bodies different? If so why?

Since action and reaction forces are always equal and opposite, how can motion then take place?

If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:

The image formed by a concave mirror is virtual, erect and magnified. The position of object is : (a) at focus (b) between focus and centre of curvature (c) at pole (d) between pole and focus

As we know the two glass rods become charged when rubbed with a silk cloth, it would be safe to conclude that they acquire ___ charges.

State the energy conversion and name the phenomenon which takes place when a magnet is moved inside a coil having a galvanometer at its end

Find the voltmeter and ammeter reading in the above circuit.

A person got his eyes tested. The optician's prescription for the spectacles reads : Left eye : - 3.00 D Right eye : - 3.50 D The person is having a defect of vision called : (a) presbyopia (b) myopia (c) astigmatism (d) hypermetropia

Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance?

If two points are maintained at 5V each and a resistor of 10 ohms is connected across them, what is the current across them?

One litre of a gas at 10∘C is heated till both its volume and pressure are tripled. Find the new temperature.

The rise of sea-water during high tide is caused by the gravitational pull of the: (a) Sun (b) Earth (c) Moon (d) Mars

Which component of biogas is used as a fuel ?

Relate the image distance (v), object distance (u) , image height (h′) and object height (h) to the formula of magnification (M) for a mirror.

What is the unit of Velocity Ratio?

When the electric current increases, does the resistance increases or decrease?

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

What is an ohmic resistor ? Give one example of an ohmic resistor. Draw a graph to show its current-voltage relationship. How is the resistance of the resistor determined from this graph?

When a troop crosses a suspension bridge, the soldiers are asked to break their steps. Why?

What is the advantage of using a convex mirror as a rear-view mirror in vehicles as compared to a plane mirror ? Illustrate your answer with the help of labelled diagrams.

Which of the following is not a natural resource? (a) soil (b) water (c) electricity (d) natural gas

The SI unit of impulse is:

___ turbines are used for the generation of electricity in thermal power plants.

If a magnification of, -1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed: (a) between pole and focus (b) at the centre of curvature (c) beyind the centre of curvature (d) at infinity

Two bodies A and B in space are attracting each other due to gravitational force. The force of attraction on B due to A is ___ to the force of attraction due to A on B.

A student obtained a sharp image of a lighted candle on a screen using convex lens. Now he wants to focus a distant lamp on a far away electric pole in which direction should the lens be moved for this purpose with respect to the screen , to get a sharp image on the screen. Justify your answer

Which electric heating devices in your home do you think have resistors which control the flow of electricity?

Calculate the work done by a man to lift a luggage of 10 kg from the ground to a height of 1.7 m above the ground. Take (g=9.8 m/s2)

State the condition for total internal reflection.

Which among these contract on melting?

What is the mirror formula? Please explain in detail along with some examples.

Select the meaning of the given phrases/idioms: To have an axe to grind.

A screw gauge with a least count of 0.01 mm is used to measure the diameter of a lead shot. The reading on the pitch scale is found to be 1 mm and the reading on the head scale is 40 divisions. If the screw gauge has a zero error of – 0.05 mm, what is the surface area of the lead shot?