16569 + Interview Questions in Physics

1.	39.Three boys are standing and bank of the river and suddenly a beautiful girls ring was fallen in river and three boys are about to take that (where 1st person has no defect in eyes,2nd person has myopia and ,3rd person is facing hypermetropia)still not using any lenses three of them jumped ata a time at same distance whom can find ring from same distance Click here to view details:
Answer» 39.Three boys are standing and bank of the river and suddenly a beautiful girls ring was fallen in river and three boys are about to take that (where 1st person has no defect in eyes,2nd person has myopia and ,3rd person is facing hypermetropia)still not using any lenses three of them jumped ata a time at same distance whom can find ring from same distance Click here to view details:

Discussion

2.	A thief jumped from an window of a twos storied building with an object of 15 KG on his head. While falling he will experience a force of 150 N.True/False.
Answer» A thief jumped from an window of a twos storied building with an object of 15 KG on his head. While falling he will experience a force of 150 N. True/False.

Discussion

3.	The linear magnification for a mirror is the ratio of the size of the image to the size of the object and is denoted by m. Then m is equal to
Answer» The linear magnification for a mirror is the ratio of the size of the image to the size of the object and is denoted by m. Then m is equal to

Discussion

4.	What happens when ligth travels from glass to air.and air to glass
Answer» What happens when ligth travels from glass to air.and air to glass

Discussion

5.	84. 2 spherical bodies of mass m and 5m and radii r and 2r respectively are released in free space with initial separation between their centres equal to 12r. If they attract each other due to gravitational force only then the distance covered by the smaller body just before collision is
Answer» 84. 2 spherical bodies of mass m and 5m and radii r and 2r respectively are released in free space with initial separation between their centres equal to 12r. If they attract each other due to gravitational force only then the distance covered by the smaller body just before collision is

Discussion

6.	(c) What should be the width of each slit to obtain 10 maxima of the double slit patternwithin the central maximum of the single slit pattern, for green light of wavelength500 nm, if the separation between two slits is 1 mm?
Answer» (c) What should be the width of each slit to obtain 10 maxima of the double slit patternwithin the central maximum of the single slit pattern, for green light of wavelength500 nm, if the separation between two slits is 1 mm?

Discussion

7.	In which of the following cases the strength of the magnetic field inside an electromagnet would change?
Answer» In which of the following cases the strength of the magnetic field inside an electromagnet would change?

Discussion

8.	An electric kettle rated as 1200 W at 220 V and a toaster rated at 1000 W at 220 V are both connected in parallel to a source of 220 V. If the fuse connected to the source blows when the current exceeds 9.0 A, can both appliances be used at the same time ? Illustrate your answer with calculations.
Answer» An electric kettle rated as 1200 W at 220 V and a toaster rated at 1000 W at 220 V are both connected in parallel to a source of 220 V. If the fuse connected to the source blows when the current exceeds 9.0 A, can both appliances be used at the same time ? Illustrate your answer with calculations.

Discussion

9.	A particle is dropped from height h. Initially a cons†an t horizontal velocity is given to the particle. Taking 'g' to be cons†an t everywhere, give the variation in kinetic energy of particle with time 't' on K.E-time graph
Answer» A particle is dropped from height h. Initially a cons†an t horizontal velocity is given to the particle. Taking 'g' to be cons†an t everywhere, give the variation in kinetic energy of particle with time 't' on K.E-time graph

Discussion

10.	Calculate the rms speed of an ideal diatomic gas having molecular weight 32 gm/mol at 0 celci^{}.If the specific heats at constant pressure and volume are respectively 8.3 J mol1 K1 and6.34 cal mol 1 K-1 respectively
Answer» Calculate the rms speed of an ideal diatomic gas having molecular weight 32 gm/mol at 0 celci^{}.If the specific heats at constant pressure and volume are respectively 8.3 J mol1 K1 and6.34 cal mol 1 K-1 respectively

Discussion

11.	In an a. c. circuit, the instantaneous e.m.f. and current are given by e=100 sin30ti=20 sin(30t−r/4). In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively.
Answer» In an a. c. circuit, the instantaneous e.m.f. and current are given by $e = 100 s i n 30 t$ $i = 20 s i n (30 t - r / 4)$ . In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively.

Discussion

12.	Given below is a list of possible reasons why a person uses a mirror. Tick the ones you agree with: (i) to check one's appearance (ii) to look beautiful (iii) to make sure one is neat and tidy before going out (iv) to check for a pimple or grey hair (v) to apply make-up (vi) to make a phone call (vii) as a decorative item at home
Answer» Given below is a list of possible reasons why a person uses a mirror. Tick the ones you agree with: (i) to check one's appearance (ii) to look beautiful (iii) to make sure one is neat and tidy before going out (iv) to check for a pimple or grey hair (v) to apply make-up (vi) to make a phone call (vii) as a decorative item at home

12.

Given below is a list of possible reasons why a person uses a mirror. Tick the ones you agree with: (i) to check one's appearance (ii) to look beautiful (iii) to make sure one is neat and tidy before going out (iv) to check for a pimple or grey hair (v) to apply make-up (vi) to make a phone call (vii) as a decorative item at home

Answer»

Given below is a
list of possible reasons why a person uses a mirror. Tick the ones
you agree with:

(i) to check one's
appearance

(ii) to look
beautiful

(iii) to make sure
one is neat and tidy before going out

(iv) to check for a
pimple or grey hair

(v) to apply make-up

(vi) to make a phone
call

(vii)
as a decorative item at home

Discussion

13.	Can we see rainbow on a sunny day give a situation to support your answer
Answer» Can we see rainbow on a sunny day give a situation to support your answer

Discussion

14.	7. The raise in the temperature of a given mass of an ideal gas at constant pressure and at temperature 27 to double its volume is (1) 327C (3) 300C (2) 54C (4) 600C
Answer» 7. The raise in the temperature of a given mass of an ideal gas at constant pressure and at temperature 27 to double its volume is (1) 327C (3) 300C (2) 54C (4) 600C

Discussion

15.	What is the SI unit of conductance?
Answer» What is the SI unit of conductance?

Discussion

16.	A person sitting on a bench hears the sound of a truck moving away at a speed of 45 kmph. If the frequency of the sound produced by the truck is 125 Hz, what is the apparent time period of the sound (in seconds) perceived by the person? (Velocity of sound in air = 350 m s−1)0.008286
Answer» A person sitting on a bench hears the sound of a truck moving away at a speed of $45 kmph$ . If the frequency of the sound produced by the truck is $125 Hz$ , what is the apparent time period of the sound (in seconds) perceived by the person? (Velocity of sound in air = $350 {m s}^{- 1}$ ) 0.008286

Discussion

17.	Area under force velocity graph
Answer» Area under force velocity graph

Discussion

18.	Draw a labelled sketch of the human eye.
Answer» Draw a labelled sketch of the human eye.

Discussion

19.	How will you connect three resistors of 3 Ω, 4 Ω and 7 Ω respectively so as to obtain a resultant resistance of 3.5 Ω?
Answer» How will you connect three resistors of $3 Ω$ , $4 Ω$ and $7 Ω$ respectively so as to obtain a resultant resistance of $3.5 Ω$ ?

Discussion

20.	The ratio of escape velocity of the earth to the escape velocity of the planet whose radius and mean density is twice as that of earth
Answer» The ratio of escape velocity of the earth to the escape velocity of the planet whose radius and mean density is twice as that of earth

Discussion

21.	The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Answer» The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Discussion

22.	The length of the solenoid is 20cm. Its area of cross section is 10cm2, and the number of turns is 1000. Another coil of 500 turns is wound in the middle. The coefficient of mutual induction will be
Answer» The length of the solenoid is 20cm. Its area of cross section is 10cm2, and the number of turns is 1000. Another coil of 500 turns is wound in the middle. The coefficient of mutual induction will be

Discussion

23.	The readings of a bath on Celsius and Fahrenheit thermometers are in the ratio 2:5. The temperature othe bath is
Answer» The readings of a bath on Celsius and Fahrenheit thermometers are in the ratio 2:5. The temperature othe bath is

Discussion

24.	The length of an astronomical telescope is 16 cm and its magnifying power is 3.Thefocal length of the lens will be
Answer» The length of an astronomical telescope is 16 cm and its magnifying power is 3.Thefocal length of the lens will be

Discussion

25.	Define specific resistance. What is its SI unit? [2 MARKS]
Answer» Define specific resistance. What is its SI unit? [2 MARKS]

Discussion

26.	What is magnetic flux ?What is the S.I. unit of magnetic flux ?
Answer» What is magnetic flux ?What is the S.I. unit of magnetic flux ?

Discussion

27.	Choose the correct alternative and rewrite the following:(1) 1mA =_______ A(a) 103A(b) 10−3 A(c) 106A(d) 10−6 A(2) To increase the effective resistance in a circuit the resistors are connected in _______(a) series(b) parallel(c) both ways(d) none of these(3) 1 kilowatt hr = _______ Joules(a) 4.6 × 106 Joule(b) 3.6 × 106 Joule(c) 30.6 × 106 Joule(d) 3.6 × 105 Joule(4) If a P. D. of 12 V is applied across a 3Ω resistor, then the current passing through it is _______(a) 36 A(b) 4 A(c) 0.25 A(d) 15 A
Answer» Choose the correct alternative and rewrite the following: (1) 1mA =_______ A (a) 10³A (b) 10⁻³ A (c) 10⁶A (d) 10⁻⁶ A (2) To increase the effective resistance in a circuit the resistors are connected in _______ (a) series (b) parallel (c) both ways (d) none of these (3) 1 kilowatt hr = _______ Joules (a) 4.6 × 10⁶ Joule (b) 3.6 × 10⁶ Joule (c) 30.6 × 10⁶ Joule (d) 3.6 × 10⁵ Joule (4) If a P. D. of 12 V is applied across a 3Ω resistor, then the current passing through it is _______ (a) 36 A (b) 4 A (c) 0.25 A (d) 15 A

27.

Choose the correct alternative and rewrite the following:(1) 1mA =___ A(a) 103A(b) 10−3 A(c) 106A(d) 10−6 A(2) To increase the effective resistance in a circuit the resistors are connected in _(a) series(b) parallel(c) both ways(d) none of these(3) 1 kilowatt hr = _ Joules(a) 4.6 × 106 Joule(b) 3.6 × 106 Joule(c) 30.6 × 106 Joule(d) 3.6 × 105 Joule(4) If a P. D. of 12 V is applied across a 3Ω resistor, then the current passing through it is ___(a) 36 A(b) 4 A(c) 0.25 A(d) 15 A

Answer»

Choose the correct alternative and rewrite the following:

(1) 1mA =_______ A

(a) 10³A

(b) 10⁻³ A

(c) 10⁶A

(d) 10⁻⁶ A

(2) To increase the effective resistance in a circuit the resistors are connected in _______

(a) series

(b) parallel

(c) both ways

(d) none of these

(3) 1 kilowatt hr = _______ Joules

(a) 4.6 × 10⁶ Joule

(b) 3.6 × 10⁶ Joule

(c) 30.6 × 10⁶ Joule

(d) 3.6 × 10⁵ Joule

(4) If a P. D. of 12 V is applied across a 3Ω resistor, then the current passing through it is _______

(a) 36 A

(b) 4 A

(c) 0.25 A

(d) 15 A

Discussion

28.	ntThe sun's angular diameter is measured to be 1920".the distance D of the sun from the earth is 149600000000m.find the diameter of the sun?n ntExplain.n
Answer» ntThe sun's angular diameter is measured to be 1920".the distance D of the sun from the earth is 149600000000m.find the diameter of the sun?n ntExplain.n

Discussion

29.	Derivation of power formulas
Answer» Derivation of power formulas

Discussion

30.	If an object at equator feels weightlessness then the duration of the da will be nearly
Answer» If an object at equator feels weightlessness then the duration of the da will be nearly

Discussion

31.	A equiconvex lens of focal length 20 cm is cut into two equal parts to obtain two plano- convex lenses. The two parts are then put in contact as shown in figure. What is the focal length of combination?
Answer» A equiconvex lens of focal length $20 cm$ is cut into two equal parts to obtain two plano- convex lenses. The two parts are then put in contact as shown in figure. What is the focal length of combination?

Discussion

32.	Magnetic field due to regular polygon of side n made up of total length 2πR which carries current I. Find the magnetic field at the centre of polygon.
Answer» Magnetic field due to regular polygon of side $n$ made up of total length $2 π R$ which carries current $I$ . Find the magnetic field at the centre of polygon.

Discussion

33.	A prism disperses a ray of white light while a rectangular glass slab does not. This is because-
Answer» A prism disperses a ray of white light while a rectangular glass slab does not. This is because-

Discussion

34.	17. Difference between acceleration due to gravity and gravity?
Answer» 17. Difference between acceleration due to gravity and gravity?

Discussion

35.	How to phasor diagrams for Ac Current and voltage.What is significance of phaso diagram.
Answer» How to phasor diagrams for Ac Current and voltage.What is significance of phaso diagram.

Discussion

36.	A biconvex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be
Answer» A biconvex lens has a focal length $f$ . It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be

Discussion

37.	Two resistors 3 ohm and 6 ohm are conected in parallel if magnitude of current in first resistor is 2A what is the current of 2nd resistor
Answer» Two resistors 3 ohm and 6 ohm are conected in parallel if magnitude of current in first resistor is 2A what is the current of 2nd resistor

Discussion

38.	The dis†an ce between a real object and its real image is 56cm formed by converging lens,focal length of lens i
Answer» The dis†an ce between a real object and its real image is 56cm formed by converging lens,focal length of lens i

Discussion

39.	let escape velocity of a body kept at surface of a planet is U . if it is projected at a speed of 200%more tha n the escape speed ,then its speed in interstellar space will b
Answer» let escape velocity of a body kept at surface of a planet is U . if it is projected at a speed of 200%more tha n the escape speed ,then its speed in interstellar space will b

Discussion

40.	A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is
Answer» A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is

Discussion

41.	The equivalent resistance seen across the terminal A' and 'B in the figure given below is
Answer» The equivalent resistance seen across the terminal A' and 'B in the figure given below is

Discussion

42.	The mass of cyclist together with the bile is 90 kg.Calculate the increase in kinetic energy if the speed increases from 6 km/hr to 12 km/hr.
Answer» The mass of cyclist together with the bile is 90 kg.Calculate the increase in kinetic energy if the speed increases from 6 km/hr to 12 km/hr.

Discussion

43.	the magnetic flux througha stationary loop with resis†an ce R varies during interval of time as ϕ=at(T-t). the heat generated during this time neglecting the induc†an ce of loop will
Answer» the magnetic flux througha stationary loop with resis†an ce R varies during interval of time as ϕ=at(T-t). the heat generated during this time neglecting the induc†an ce of loop will

Discussion

44.	a force f is applied on a block at an angle theta the block is displaced by a displacement x if work done by the force f is zero then angle theta is
Answer» a force f is applied on a block at an angle theta the block is displaced by a displacement x if work done by the force f is zero then angle theta is

Discussion

45.	If Aufbau rule is followed, then the 19th electron of Sc (Z = 21) will have:
Answer» If Aufbau rule is followed, then the $19^{t h}$ electron of Sc (Z = 21) will have:

Discussion

46.	Justify the statement ' plants and animals are pH sensitive' by giving two examples.
Answer» Justify the statement ' plants and animals are p^H sensitive' by giving two examples.

Discussion

47.	The values of d1 and d2 for final rays to be parallel to the principal axis could be: (focal length of the lenses are written above the respective lenses in the given figure).
Answer» The values of $d_{1}$ and $d_{2}$ for final rays to be parallel to the principal axis could be: (focal length of the lenses are written above the respective lenses in the given figure).

Discussion

48.	The circuit was in the shown state from a long time. Now, the switch S is closed. The charge that flows through the switch is
Answer» The circuit was in the shown state from a long time. Now, the switch S is closed. The charge that flows through the switch is

Discussion

49.	47.An electrochemical cell has two half cell reaction as, A2+ +2e---A ;E^° = 0.34V X---X2+ +2e ; E^° = +2.34V The cell voltage will be ?
Answer» 47.An electrochemical cell has two half cell reaction as, A2+ +2e---A ;E^° = 0.34V X---X2+ +2e ; E^° = +2.34V The cell voltage will be ?

Discussion

50.	A cell E1of emf 6 V and internal resistance 2Ω is connected with another cell E2 of emf 4 V and internal resistance 6Ω as shown in the figure below. The potential difference between the points X and Y is
Answer» A cell $E_{1}$ of emf $6 V$ and internal resistance $2 Ω$ is connected with another cell $E_{2}$ of emf $4 V$ and internal resistance $6 Ω$ as shown in the figure below. The potential difference between the points $X$ and $Y$ is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A thief jumped from an window of a twos storied building with an object of 15 KG on his head. While falling he will experience a force of 150 N.True/False.

The linear magnification for a mirror is the ratio of the size of the image to the size of the object and is denoted by m. Then m is equal to

What happens when ligth travels from glass to air.and air to glass

84. 2 spherical bodies of mass m and 5m and radii r and 2r respectively are released in free space with initial separation between their centres equal to 12r. If they attract each other due to gravitational force only then the distance covered by the smaller body just before collision is

(c) What should be the width of each slit to obtain 10 maxima of the double slit patternwithin the central maximum of the single slit pattern, for green light of wavelength500 nm, if the separation between two slits is 1 mm?

In which of the following cases the strength of the magnetic field inside an electromagnet would change?

An electric kettle rated as 1200 W at 220 V and a toaster rated at 1000 W at 220 V are both connected in parallel to a source of 220 V. If the fuse connected to the source blows when the current exceeds 9.0 A, can both appliances be used at the same time ? Illustrate your answer with calculations.

A particle is dropped from height h. Initially a cons†an t horizontal velocity is given to the particle. Taking 'g' to be cons†an t everywhere, give the variation in kinetic energy of particle with time 't' on K.E-time graph

Calculate the rms speed of an ideal diatomic gas having molecular weight 32 gm/mol at 0 celci^{}.If the specific heats at constant pressure and volume are respectively 8.3 J mol1 K1 and6.34 cal mol 1 K-1 respectively

In an a. c. circuit, the instantaneous e.m.f. and current are given by e=100 sin30ti=20 sin(30t−r/4). In one cycle of a.c., the average power consumed by the circuit and the wattless current are, respectively.

Can we see rainbow on a sunny day give a situation to support your answer

7. The raise in the temperature of a given mass of an ideal gas at constant pressure and at temperature 27 to double its volume is (1) 327C (3) 300C (2) 54C (4) 600C

What is the SI unit of conductance?

A person sitting on a bench hears the sound of a truck moving away at a speed of 45 kmph. If the frequency of the sound produced by the truck is 125 Hz, what is the apparent time period of the sound (in seconds) perceived by the person? (Velocity of sound in air = 350 m s−1)0.008286

Area under force velocity graph

Draw a labelled sketch of the human eye.

How will you connect three resistors of 3 Ω, 4 Ω and 7 Ω respectively so as to obtain a resultant resistance of 3.5 Ω?

The ratio of escape velocity of the earth to the escape velocity of the planet whose radius and mean density is twice as that of earth

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

The length of the solenoid is 20cm. Its area of cross section is 10cm2, and the number of turns is 1000. Another coil of 500 turns is wound in the middle. The coefficient of mutual induction will be

The readings of a bath on Celsius and Fahrenheit thermometers are in the ratio 2:5. The temperature othe bath is

The length of an astronomical telescope is 16 cm and its magnifying power is 3.Thefocal length of the lens will be

Define specific resistance. What is its SI unit? [2 MARKS]

What is magnetic flux ?What is the S.I. unit of magnetic flux ?

ntThe sun's angular diameter is measured to be 1920".the distance D of the sun from the earth is 149600000000m.find the diameter of the sun?n ntExplain.n

Derivation of power formulas

If an object at equator feels weightlessness then the duration of the da will be nearly

A equiconvex lens of focal length 20 cm is cut into two equal parts to obtain two plano- convex lenses. The two parts are then put in contact as shown in figure. What is the focal length of combination?

Magnetic field due to regular polygon of side n made up of total length 2πR which carries current I. Find the magnetic field at the centre of polygon.

A prism disperses a ray of white light while a rectangular glass slab does not. This is because-

17. Difference between acceleration due to gravity and gravity?

How to phasor diagrams for Ac Current and voltage.What is significance of phaso diagram.

A biconvex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be

Two resistors 3 ohm and 6 ohm are conected in parallel if magnitude of current in first resistor is 2A what is the current of 2nd resistor

The dis†an ce between a real object and its real image is 56cm formed by converging lens,focal length of lens i

let escape velocity of a body kept at surface of a planet is U . if it is projected at a speed of 200%more tha n the escape speed ,then its speed in interstellar space will b

A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is

The equivalent resistance seen across the terminal A' and 'B in the figure given below is

The mass of cyclist together with the bile is 90 kg.Calculate the increase in kinetic energy if the speed increases from 6 km/hr to 12 km/hr.

the magnetic flux througha stationary loop with resis†an ce R varies during interval of time as ϕ=at(T-t). the heat generated during this time neglecting the induc†an ce of loop will

a force f is applied on a block at an angle theta the block is displaced by a displacement x if work done by the force f is zero then angle theta is

If Aufbau rule is followed, then the 19th electron of Sc (Z = 21) will have:

Justify the statement ' plants and animals are p​​​​​​H​​​​​ sensitive' by giving two examples.

The values of d1 and d2 for final rays to be parallel to the principal axis could be: (focal length of the lenses are written above the respective lenses in the given figure).

The circuit was in the shown state from a long time. Now, the switch S is closed. The charge that flows through the switch is

47.An electrochemical cell has two half cell reaction as, A2+ +2e---A ;E^° = 0.34V X---X2+ +2e ; E^° = +2.34V The cell voltage will be ?

A cell E1of emf 6 V and internal resistance 2Ω is connected with another cell E2 of emf 4 V and internal resistance 6Ω as shown in the figure below. The potential difference between the points X and Y is

Justify the statement ' plants and animals are pH sensitive' by giving two examples.