16569 + Interview Questions in Physics

1.	A quartz piezo-electric crystal having dimensions of 5 mm×5 mm×1 mm and a voltage sensitivity of 0.05 V−m/N is used for force measurement. The voltage generated due to applied force is given to an amplifier of amplification factor 500. If the voltage developed at amplifier output is 100 V. Then the amount of applied force is ____ N.0.1
Answer» A quartz piezo-electric crystal having dimensions of $5 m m \times 5 m m \times 1 m m$ and a voltage sensitivity of $0.05 V - m / N$ is used for force measurement. The voltage generated due to applied force is given to an amplifier of amplification factor $500$ . If the voltage developed at amplifier output is $100 V$ . Then the amount of applied force is ____ $N$ . 0.1

Discussion

2.	EXPLIAN THE PRINCIPLE AND WORKING OF VAN DE GERAAFF GENERATOR IN POINTS WIHTH DIAGRAM . (2011 DELHI)
Answer» EXPLIAN THE PRINCIPLE AND WORKING OF VAN DE GERAAFF GENERATOR IN POINTS WIHTH DIAGRAM . (2011 DELHI)

Discussion

3.	A bar magnet is moving away from a conducting coil placed near it ,find direction of current induced in coil
Answer» A bar magnet is moving away from a conducting coil placed near it ,find direction of current induced in coil

Discussion

4.	40. Electric bulb 50W-100V glowing at full poi's used in parallel with battery 120V , 10ohm. Maximum number of bulbs that can be connected so that they glow in full power is ??
Answer» 40. Electric bulb 50W-100V glowing at full poi's used in parallel with battery 120V , 10ohm. Maximum number of bulbs that can be connected so that they glow in full power is ??

Discussion

5.	Explain regelation.
Answer» Explain regelation.

Discussion

6.	The resistivity of a resistor is 5 Ω−m. Its length is 1m and area of cross section is 2mm2. The resistance is .
Answer» The resistivity of a resistor is 5 $Ω - m$ . Its length is 1 $m$ and area of cross section is $2 m m^{2}$ . The resistance is .

Discussion

7.	Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?
Answer» Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

7.

Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

Answer»

Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

Discussion

8.	What do you understand by the deviation produced by a prism? Why is it caused? State three factors on which the angle of deviation depends.
Answer» What do you understand by the deviation produced by a prism? Why is it caused? State three factors on which the angle of deviation depends.

Discussion

9.	How does the image of the word EARTH appear to a person when looked through a periscope?
Answer» How does the image of the word EARTH appear to a person when looked through a periscope?

Discussion

10.	The refractive index of a medium is 1.5. If magnetic permeability of the medium is 5 × 10–7 (tesla - metre/ampere) then relative permittivity of the medium is approximately
Answer» The refractive index of a medium is 1.5. If magnetic permeability of the medium is 5 × 10–7 (tesla - metre/ampere) then relative permittivity of the medium is approximately

Discussion

11.	Prove mid point theorem
Answer» Prove mid point theorem

Discussion

12.	State the condition when a lens is called an equiconvex or equi-concave.
Answer» State the condition when a lens is called an equiconvex or equi-concave.

Discussion

13.	Define average power.
Answer» Define average power.

Discussion

14.	on an inclined plane at an angle 30* to the horizontal , a ball is thrown upwards with a velocity of 10m/s ,at an angle 60* to the inclined plane.Its range on the inclined plane is
Answer» on an inclined plane at an angle 30* to the horizontal , a ball is thrown upwards with a velocity of 10m/s ,at an angle 60* to the inclined plane.Its range on the inclined plane is

Discussion

15.	The amount of heat energy required to convert 1 kg of ice at −10∘C to water at 100∘C is 7,77,000 J. Calculate the specific latent heat of ice. Specific heat capacity of ice = 2100 J kg−1 K−1, specific heat capacity of water=4200 J kg−1 K−1.
Answer» The amount of heat energy required to convert 1 kg of ice at $- 10^{\circ} C$ to water at $100^{\circ} C$ is 7,77,000 J. Calculate the specific latent heat of ice. Specific heat capacity of ice = 2100 J $k g^{- 1} K^{- 1}$ , specific heat capacity of water=4200 J k $g^{- 1} K^{- 1}$ .

15.

The amount of heat energy required to convert 1 kg of ice at −10∘C to water at 100∘C is 7,77,000 J. Calculate the specific latent heat of ice. Specific heat capacity of ice = 2100 J kg−1 K−1, specific heat capacity of water=4200 J kg−1 K−1.

Answer»

The amount of heat energy required to convert 1 kg of ice at $- 10^{\circ} C$ to water at $100^{\circ} C$ is 7,77,000 J. Calculate the specific latent heat of ice.

Specific heat capacity of ice = 2100 J $k g^{- 1} K^{- 1}$ , specific heat capacity of water=4200 J k $g^{- 1} K^{- 1}$ .

Discussion

16.	A light ray is passing from medium A to B and sin isin r is greater than one. This implies:
Answer» A light ray is passing from medium $A$ to $B$ and $\frac{s i n i}{s i n r}$ is greater than one. This implies:

Discussion

17.	Potential energy possessed by an object of mass m and raised to a height 2h above the earth's surface is:
Answer» Potential energy possessed by an object of mass m and raised to a height 2h above the earth's surface is:

Discussion

18.	A bird perches on a high temperature and nothing happens to the bird .How ?
Answer» A bird perches on a high temperature and nothing happens to the bird .How ?

Discussion

19.	describe an activity with diagram to draw magnetic field lines due to a current carrying circular loop
Answer» describe an activity with diagram to draw magnetic field lines due to a current carrying circular loop

Discussion

20.	A solenoid has an inductance of 60 H and a resistance of 30 Ω. If it is connected to a 100 V battery, how long will it take for the current to reach 63.2% of its steady state value?
Answer» A solenoid has an inductance of $60 H$ and a resistance of $30 Ω$ . If it is connected to a $100 V$ battery, how long will it take for the current to reach $63.2 %$ of its steady state value?

Discussion

21.	What is the difference between electric permittivity and magnetic permeability and what are their values?
Answer» What is the difference between electric permittivity and magnetic permeability and what are their values?

Discussion

22.	A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
Answer» A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will

Discussion

23.	When 229 J energy is supplied as heat at constant pressure to 3 Mol AR gas, the temp of sample is increased by 2.55 k, calculate molar heat capacity at constant volume
Answer» When 229 J energy is supplied as heat at constant pressure to 3 Mol AR gas, the temp of sample is increased by 2.55 k, calculate molar heat capacity at constant volume

Discussion

24.	49.A calorimeter contains 75g of water at 15^° C. When 50g water at 100^° C is poured in the calorimeter, the temperature of the mixture becomes 25^° C. Calculate water equivalent of the calorimeter.
Answer» 49.A calorimeter contains 75g of water at 15^° C. When 50g water at 100^° C is poured in the calorimeter, the temperature of the mixture becomes 25^° C. Calculate water equivalent of the calorimeter.

Discussion

25.	(a) What is solar constant ? What is the value of solar constant ? (b) If the energy received by 5 m2 area in 10 minutes is 4200 kj, calculate the value of solar constant.
Answer» (a) What is solar constant ? What is the value of solar constant ? (b) If the energy received by 5 $m^{2}$ area in 10 minutes is 4200 kj, calculate the value of solar constant.

Discussion

26.	Which of the following metals/non-metals are conductors of electricity ?
Answer» Which of the following metals/non-metals are conductors of electricity ?

Discussion

27.	Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights & weights.
Answer» Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights & weights.

Discussion

28.	The mirror which can form a magnified image of an object is : (a) convex mirror (b) plane mirror (c) concave mirror (d) both convex and concave mirrors
Answer» The mirror which can form a magnified image of an object is : (a) convex mirror (b) plane mirror (c) concave mirror (d) both convex and concave mirrors

Discussion

29.	What happens to the force between two objects, if(i) the mass of one object is doubled?(ii) the distance between the objects is doubled and tripled?(iii) the masses of both objects are doubled?
Answer» What happens to the force between two objects, if (i) the mass of one object is doubled? (ii) the distance between the objects is doubled and tripled? (iii) the masses of both objects are doubled?

Discussion

30.	The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. Does the direction of the current in the coil appear clockwise or anticlockwise when viewed from the end A?
Answer» The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. Does the direction of the current in the coil appear clockwise or anticlockwise when viewed from the end A?

30.

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. Does the direction of the current in the coil appear clockwise or anticlockwise when viewed from the end A?

Answer»

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown.

Does the direction of the current in the coil appear clockwise or anticlockwise when viewed from the end A?

Discussion

31.	Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in circular orbit of radius R around the sun will be proportional to
Answer» Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in circular orbit of radius R around the sun will be proportional to

Discussion

32.	A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 m/s. The amount of work required to stop it is
Answer» A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 m/s. The amount of work required to stop it is

Discussion

33.	Snow on the mountains does not melt all at once. Choose the correct reason for the above:
Answer» Snow on the mountains does not melt all at once. Choose the correct reason for the above:

Discussion

34.	12 A body of mass 5kg is acted upon by two perpendicular forces 8N and 6N, find the magnitude and direction of the acceleration
Answer» 12 A body of mass 5kg is acted upon by two perpendicular forces 8N and 6N, find the magnitude and direction of the acceleration

Discussion

35.	What is the meaning of B (magnetic field) proportional to the n raise to the -5 ? (n = principle quantum number or number of shells)
Answer» What is the meaning of B (magnetic field) proportional to the n raise to the -5 ? (n = principle quantum number or number of shells)

Discussion

36.	Their pride in themselves and their family
Answer» Their pride in themselves and their family

Discussion

37.	Which of the following is not a renewable source of energy? (a) wind (b flowing water (c) fossil fuels (d) fuel wood
Answer» Which of the following is not a renewable source of energy? (a) wind (b flowing water (c) fossil fuels (d) fuel wood

Discussion

38.	13.The distance between plates of a parallel plate capacitor is d and area of each plate is A, as shown in figure. both the plates are grounded and a small body carrying a charge Q is placed between them at a distance x from one plate. What charge will accumulate on both the plates
Answer» 13.The distance between plates of a parallel plate capacitor is d and area of each plate is A, as shown in figure. both the plates are grounded and a small body carrying a charge Q is placed between them at a distance x from one plate. What charge will accumulate on both the plates

Discussion

39.	How many primary resources are there in watershed management? __
Answer» How many primary resources are there in watershed management? __

Discussion

40.	A four stroke petrol engine has a compression ratio of 10.5, takes air at 90 kPa and 40∘C and is repeated 2500 times per minute. Using constant specific heats(cp=1.005kJ/kgK,cv=0.718kJ/kgK. and γ=1.4) at room temperature, then the rate of heat input is _____ kW. if the cycle is to produce 900J/cycle.61.515
Answer» A four stroke petrol engine has a compression ratio of 10.5, takes air at 90 kPa and $40^{\circ} C$ and is repeated 2500 times per minute. Using constant specific heats ( $c_{p} = 1.005 k J / k g K, c_{v} = 0.718 k J / k g K$ . and $γ = 1.4$ ) at room temperature, then the rate of heat input is _____ kW. if the cycle is to produce 900J/cycle. 61.515

Discussion

41.	One source of background radiation is
Answer» One source of background radiation is

Discussion

42.	Question 16Find the focal length of a lens of power -2.0 D. What type of lens is this?
Answer» Question 16 Find the focal length of a lens of power -2.0 D. What type of lens is this?

Discussion

43.	Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω respectively are joined together as shown in the figure. The resistors are connected to an ammeter and to a cell of emf 6.0 V. The current drawn from the cell is:
Answer» Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω respectively are joined together as shown in the figure. The resistors are connected to an ammeter and to a cell of emf 6.0 V. The current drawn from the cell is:

43.

Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω respectively are joined together as shown in the figure. The resistors are connected to an ammeter and to a cell of emf 6.0 V. The current drawn from the cell is:

Answer»

Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω respectively are joined together as shown in the figure. The resistors are connected to an ammeter and to a cell of emf 6.0 V.

The current drawn from the cell is:

Discussion

44.	what is conservation of momentum?
Answer» what is conservation of momentum?

Discussion

45.	74.two masses m1 and m2 are connected by a massless string find the value of tension in the spring if a force of 200N is applied on (i)m1 and (ii)m2
Answer» 74.two masses m1 and m2 are connected by a massless string find the value of tension in the spring if a force of 200N is applied on (i)m1 and (ii)m2

Discussion

46.	An incandescent bulb is designed to operate at 12 V DC source. If this bulb is connected to an AC source, and it gives the same brightness, what would be the peak voltage of AC?
Answer» An incandescent bulb is designed to operate at $12 V$ DC source. If this bulb is connected to an AC source, and it gives the same brightness, what would be the peak voltage of AC?

Discussion

47.	What is danial cell and e cell
Answer» What is danial cell and e cell

Discussion

48.	An object of height h=5 cm is located at a distance a=12 cm from a concave mirror with focal length 10 cm. Find the height of the image.(Object is placed perpendicular to principle axis)
Answer» An object of height $h = 5 cm$ is located at a distance $a = 12 cm$ from a concave mirror with focal length $10 cm$ . Find the height of the image. (Object is placed perpendicular to principle axis)

Discussion

49.	17. Consider a system of two particles having masses2 kg and 5 kg. If the particle of mass 2 kg ispushed towards the centre of mass of particlesthrough a distance 5 m, by what distance wouldparticle of mass 5 kg move so as to keep thecentre of mass of particles at the original position?(1) 2 m(2) 12.5 m(3) 8 m(4) 5 mlinear speed of a narticle moving in a circular path
Answer» 17. Consider a system of two particles having masses2 kg and 5 kg. If the particle of mass 2 kg ispushed towards the centre of mass of particlesthrough a distance 5 m, by what distance wouldparticle of mass 5 kg move so as to keep thecentre of mass of particles at the original position?(1) 2 m(2) 12.5 m(3) 8 m(4) 5 mlinear speed of a narticle moving in a circular path

Discussion

50.	There is a black spot on a table. A glass slab of thickness 6 cm is placed on the table over the spot. The refractive index of glass is 32. At what depth from the upper surface will the spot appear when viewed from above?
Answer» There is a black spot on a table. A glass slab of thickness 6 cm is placed on the table over the spot. The refractive index of glass is $\frac{3}{2}$ . At what depth from the upper surface will the spot appear when viewed from above?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

EXPLIAN THE PRINCIPLE AND WORKING OF VAN DE GERAAFF GENERATOR IN POINTS WIHTH DIAGRAM . (2011 DELHI)

A bar magnet is moving away from a conducting coil placed near it ,find direction of current induced in coil

40. Electric bulb 50W-100V glowing at full poi's used in parallel with battery 120V , 10ohm. Maximum number of bulbs that can be connected so that they glow in full power is ??

Explain regelation.

The resistivity of a resistor is 5 Ω−m. Its length is 1m and area of cross section is 2mm2. The resistance is .

Above picture is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

What do you understand by the deviation produced by a prism? Why is it caused? State three factors on which the angle of deviation depends.

How does the image of the word EARTH appear to a person when looked through a periscope?

The refractive index of a medium is 1.5. If magnetic permeability of the medium is 5 × 10–7 (tesla - metre/ampere) then relative permittivity of the medium is approximately

Prove mid point theorem

State the condition when a lens is called an equiconvex or equi-concave.

Define average power.

on an inclined plane at an angle 30* to the horizontal , a ball is thrown upwards with a velocity of 10m/s ,at an angle 60* to the inclined plane.Its range on the inclined plane is

The amount of heat energy required to convert 1 kg of ice at −10∘C to water at 100∘C is 7,77,000 J. Calculate the specific latent heat of ice. Specific heat capacity of ice = 2100 J kg−1 K−1, specific heat capacity of water=4200 J kg−1 K−1.

A light ray is passing from medium A to B and sin isin r is greater than one. This implies:

Potential energy possessed by an object of mass m and raised to a height 2h above the earth's surface is:

A bird perches on a high temperature and nothing happens to the bird .How ?

describe an activity with diagram to draw magnetic field lines due to a current carrying circular loop

A solenoid has an inductance of 60 H and a resistance of 30 Ω. If it is connected to a 100 V battery, how long will it take for the current to reach 63.2% of its steady state value?

What is the difference between electric permittivity and magnetic permeability and what are their values?

A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will

When 229 J energy is supplied as heat at constant pressure to 3 Mol AR gas, the temp of sample is increased by 2.55 k, calculate molar heat capacity at constant volume

49.A calorimeter contains 75g of water at 15^° C. When 50g water at 100^° C is poured in the calorimeter, the temperature of the mixture becomes 25^° C. Calculate water equivalent of the calorimeter.

(a) What is solar constant ? What is the value of solar constant ? (b) If the energy received by 5 m2 area in 10 minutes is 4200 kj, calculate the value of solar constant.

Which of the following metals/non-metals are conductors of electricity ?

Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights &amp; weights.

The mirror which can form a magnified image of an object is : (a) convex mirror (b) plane mirror (c) concave mirror (d) both convex and concave mirrors

What happens to the force between two objects, if(i) the mass of one object is doubled?(ii) the distance between the objects is doubled and tripled?(iii) the masses of both objects are doubled?

The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. Does the direction of the current in the coil appear clockwise or anticlockwise when viewed from the end A?

Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in circular orbit of radius R around the sun will be proportional to

A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 m/s. The amount of work required to stop it is

Snow on the mountains does not melt all at once. Choose the correct reason for the above:

12 A body of mass 5kg is acted upon by two perpendicular forces 8N and 6N, find the magnitude and direction of the acceleration

What is the meaning of B (magnetic field) proportional to the n raise to the -5 ? (n = principle quantum number or number of shells)

Their pride in themselves and their family

Which of the following is not a renewable source of energy? (a) wind (b flowing water (c) fossil fuels (d) fuel wood

13.The distance between plates of a parallel plate capacitor is d and area of each plate is A, as shown in figure. both the plates are grounded and a small body carrying a charge Q is placed between them at a distance x from one plate. What charge will accumulate on both the plates

How many primary resources are there in watershed management? __

One source of background radiation is

Question 16Find the focal length of a lens of power -2.0 D. What type of lens is this?

Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω respectively are joined together as shown in the figure. The resistors are connected to an ammeter and to a cell of emf 6.0 V. The current drawn from the cell is:

what is conservation of momentum?

74.two masses m1 and m2 are connected by a massless string find the value of tension in the spring if a force of 200N is applied on (i)m1 and (ii)m2

An incandescent bulb is designed to operate at 12 V DC source. If this bulb is connected to an AC source, and it gives the same brightness, what would be the peak voltage of AC?

What is danial cell and e cell

An object of height h=5 cm is located at a distance a=12 cm from a concave mirror with focal length 10 cm. Find the height of the image.(Object is placed perpendicular to principle axis)

There is a black spot on a table. A glass slab of thickness 6 cm is placed on the table over the spot. The refractive index of glass is 32. At what depth from the upper surface will the spot appear when viewed from above?

Two spheres have masses in the ratio 2:3 but have same gravitational PE. Calculate the ratio of their heights & weights.