16569 + Interview Questions in Physics

1.	In which of the following cases light bends towards the normal ray?
Answer» In which of the following cases light bends towards the normal ray?

Discussion

2.	what is the diameter (cm) of eyeball in normal adult eye
Answer» what is the diameter (cm) of eyeball in normal adult eye

Discussion

3.	Relative velocity
Answer» Relative velocity

Discussion

4.	A conducting ring of radius R, mass M and carrying current I in anticlockwise direction as seen from top hangs, with its plane parallel to horizontal plane, by two non-conducting strings as shown in the figure. The uniform horizontal magnetic field B exists is the region. If both strings are tight and the ring is in equilibrium, find the minimum tension in the any string.
Answer» A conducting ring of radius R, mass M and carrying current I in anticlockwise direction as seen from top hangs, with its plane parallel to horizontal plane, by two non-conducting strings as shown in the figure. The uniform horizontal magnetic field B exists is the region. If both strings are tight and the ring is in equilibrium, find the minimum tension in the any string.

Discussion

5.	Ring of radius R and resistance R is falling vertically along 2 frictionless vertical conducting drills which are connected at the top if a current I is induced in the connected ab when the speed of the wind is V then the magnitude of the magnetic field is
Answer» Ring of radius R and resistance R is falling vertically along 2 frictionless vertical conducting drills which are connected at the top if a current I is induced in the connected ab when the speed of the wind is V then the magnitude of the magnetic field is

Discussion

6.	The ratio of escape velocity at earth to the escape velocity at a planet whose radius and mean density are twice as that of earh is
Answer» The ratio of escape velocity at earth to the escape velocity at a planet whose radius and mean density are twice as that of earh is

Discussion

7.	Why is the resistance less when resistors are joined in parallel?
Answer» Why is the resistance less when resistors are joined in parallel?

Discussion

8.	Conventional direction of electric current is from
Answer» Conventional direction of electric current is from

Discussion

9.	A divergence lens of focal length of 30cm forms the image of an object of size 6 cm on the same side as of the object at a distance of 15cm from its optical centre .use lens formula to determine the distance of the object from the lens and the size of image formed ... Draw a ray daigram to show the formation of image in the above situation .
Answer» A divergence lens of focal length of 30cm forms the image of an object of size 6 cm on the same side as of the object at a distance of 15cm from its optical centre .use lens formula to determine the distance of the object from the lens and the size of image formed ... Draw a ray daigram to show the formation of image in the above situation .

9.

A divergence lens of focal length of 30cm forms the image of an object of size 6 cm on the same side as of the object at a distance of 15cm from its optical centre .use lens formula to determine the distance of the object from the lens and the size of image formed ... Draw a ray daigram to show the formation of image in the above situation .

Answer»

A divergence lens of focal length of 30cm forms the image of an object of size 6 cm on the same side as of the object at a distance of 15cm from its optical centre .use lens formula to determine the distance of the object from the lens and the size of image formed ...

Draw a ray daigram to show the formation of image in the above situation .

Discussion

10.	How did Avogadro got 6.022×10²³
Answer» How did Avogadro got 6.022×10²³

Discussion

11.	A second order system is generated by¨y(t)+˙y(t)−2y(t)=u(t)A closed loop system is designed with unity negative feedback using above system and proportional controller with gian Kp.The closed loop system will remain stable for
Answer» A second order system is generated by $¨ y (t) + ˙ y (t) - 2 y (t) = u (t)$ A closed loop system is designed with unity negative feedback using above system and proportional controller with gian $K_{p} .$ The closed loop system will remain stable for

Discussion

12.	What is common among the following images?
Answer» What is common among the following images?

Discussion

13.	Question 16Why do bulbs have two terminals?
Answer» Question 16 Why do bulbs have two terminals?

13.

Question 16Why do bulbs have two terminals?

Answer»

Question 16

Why do bulbs have two terminals?

Discussion

14.	a calorimeter contains 10g of water at 20degreeC.the temperature falls to 15degrreeC in 10min.when calorimeter contains 20g of water at20degreeC, it takes 15 min for the temperature to become 15degrreeC.the water equivalent of the calorimeter is
Answer» a calorimeter contains 10g of water at 20degreeC.the temperature falls to 15degrreeC in 10min.when calorimeter contains 20g of water at20degreeC, it takes 15 min for the temperature to become 15degrreeC.the water equivalent of the calorimeter is

Discussion

15.	One type of energy which has not been controlled so far is : (a) ocean thermal energy (b) nuclear fusion energy (c) geothermal energy (d) nuclear fission energy
Answer» One type of energy which has not been controlled so far is : (a) ocean thermal energy (b) nuclear fusion energy (c) geothermal energy (d) nuclear fission energy

Discussion

16.	Radius of moon is 1/4 times that of earth and mass is 1/81 times that of earth.Tthe point at which gravitational field due to earth becomes equal and opposite to that of moon is?\lbrack dis†an ce between centers of earth and moon is 60 R,where R is radius of the earth\rbrack
Answer» Radius of moon is 1/4 times that of earth and mass is 1/81 times that of earth.Tthe point at which gravitational field due to earth becomes equal and opposite to that of moon is?\lbrack dis†an ce between centers of earth and moon is 60 R,where R is radius of the earth\rbrack

Discussion

17.	135.A liquid of refractive index 4/3 is placed between two identical planoconvex-lenses tuching each other at their spherical surface of radius 1/R . If refractive index 0f lens is 1.50, then the lens behave as 1) Convergent with power P = 1/3R 2) Convergent with power P = 1/6R 3) Divergent with power P = 1/3R 4) Divergent with power P = 1/6R
Answer» 135.A liquid of refractive index 4/3 is placed between two identical planoconvex-lenses tuching each other at their spherical surface of radius 1/R . If refractive index 0f lens is 1.50, then the lens behave as 1) Convergent with power P = 1/3R 2) Convergent with power P = 1/6R 3) Divergent with power P = 1/3R 4) Divergent with power P = 1/6R

Discussion

18.	Give a method to conserve energy at school.
Answer» Give a method to conserve energy at school.

Discussion

19.	A potential difference of 2 V is applied across the opposite faces of a Germanium plate, of area 1 cm2 and thickness 0.5 mm. If the concentration of electrons is 2×1019 m−3 and mobilities of electrons and holes are 0.36 m2/V-s and 0.14 m2/V-s respectively, the current flowing through the plate will be,
Answer» A potential difference of $2 V$ is applied across the opposite faces of a Germanium plate, of area $1 {cm}^{2}$ and thickness $0.5 mm$ . If the concentration of electrons is $2 \times 10^{19} m^{- 3}$ and mobilities of electrons and holes are $0.36 m^{2} /V-s$ and $0.14 m^{2} /V-s$ respectively, the current flowing through the plate will be,

Discussion

20.	In which of the following circuit(s) will an ammeter and a voltmeter work properly and show the correct reading?
Answer» In which of the following circuit(s) will an ammeter and a voltmeter work properly and show the correct reading?

Discussion

21.	A square loop of side 2a, and carrying current I, is kept in XZ plane with its centre at origin. A long wire carrying the same current I is placed parallel to the z−axis and passing through the point (0,b,0) (b>>a). The magnitude of the torque on the loop about z−axis is given by:
Answer» A square loop of side $2 a$ , and carrying current $I$ , is kept in $X Z$ plane with its centre at origin. A long wire carrying the same current $I$ is placed parallel to the $z -$ axis and passing through the point $(0, b, 0) (b >> a)$ . The magnitude of the torque on the loop about $z -$ axis is given by:

Discussion

22.	Which of the following change occurs during evaporation?
Answer» Which of the following change occurs during evaporation?

Discussion

23.	Mx and My denote the atomic masses of parent and daughter nuclei respectively in a radiaoactive decay. If Q value of B+ decay is Q1, then value of Q1 is (me : mass of electron)
Answer» $M_{x}$ and $M_{y}$ denote the atomic masses of parent and daughter nuclei respectively in a radiaoactive decay. If $Q$ value of $B^{+}$ decay is $Q_{1},$ then value of $Q_{1}$ is ( $m_{e}$ : mass of electron)

Discussion

24.	Out of the two lenses of focal length 20cm and 40cm, which lens is used to get more convergent light???
Answer» Out of the two lenses of focal length 20cm and 40cm, which lens is used to get more convergent light???

Discussion

25.	A vernier scale with }10 divisions slides over a main }{ scale whose pitch is }0.5mm (pitch }=1MSD) . If a }} bob of diameter }9.75mm is held between the jaws, } determine the M.S.R.R and VC.D if } (a) there is no zero error. } (b) the zero error }=0.35mm.
Answer» A vernier scale with }10 divisions slides over a main }{ scale whose pitch is }0.5mm (pitch }=1MSD) . If a }} bob of diameter }9.75mm is held between the jaws, } determine the M.S.R.R and VC.D if } (a) there is no zero error. } (b) the zero error }=0.35mm.

Discussion

26.	At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.
Answer» At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.

Discussion

27.	A uniform cylindrical coil in vacuum has r1= 1m, l1=1 m and 100 turns.Co axial and at the center of this coil is a smaller coil of r2= 10 cm, l2=10 cmand 10 turns. What is the mutual inductance of the two coils?
Answer» A uniform cylindrical coil in vacuum has r1= 1m, l1=1 m and 100 turns.Co axial and at the center of this coil is a smaller coil of r2= 10 cm, l2=10 cmand 10 turns. What is the mutual inductance of the two coils?

Discussion

28.	If the speed of a charge particles moving through a magnetic field is increased then they radius of curvature of it circular path will
Answer» If the speed of a charge particles moving through a magnetic field is increased then they radius of curvature of it circular path will

Discussion

29.	In Tyndall effect, the colour of light that is scattered depends on:
Answer» In Tyndall effect, the colour of light that is scattered depends on:

Discussion

30.	In lens makers formula if R1 and R2 are equal then f becomes infinite how? Does any condition exists like R1= R2? For a double convex/concave lens how R1 ≠ R2?
Answer» In lens makers formula if R1 and R2 are equal then f becomes infinite how? Does any condition exists like R1= R2? For a double convex/concave lens how R1 ≠ R2?

Discussion

31.	the energy required to convert all atoms presrent in 1.2g magnesium to magmnesium to mg^{2+} ions if lE,and lE_2 of magnesium are 120kj mol^{-1 }and 240 kj mol^{-1 }respectivel
Answer» the energy required to convert all atoms presrent in 1.2g magnesium to magmnesium to mg^{2+} ions if lE,and lE_2 of magnesium are 120kj mol^{-1 }and 240 kj mol^{-1 }respectivel

Discussion

32.	The Laplace transform of e−4tsin3tt is
Answer» The Laplace transform of $e^{- 4 t} \frac{sin 3 t}{t}$ is

Discussion

33.	Following figures show the arrangement of bar magnetism in different configurations. Each magnet has magnetic dipole moment →m . Which configuration has highest net magnetic dipole moment ?
Answer» Following figures show the arrangement of bar magnetism in different configurations. Each magnet has magnetic dipole moment $\to m$ . Which configuration has highest net magnetic dipole moment ?

Discussion

34.	If 1 g of Hydrogen is converted into 0.993 g of Helium in a thermonuclear reaction, then the energy released is
Answer» If 1 g of Hydrogen is converted into 0.993 g of Helium in a thermonuclear reaction, then the energy released is

Discussion

35.	A light ray from air strikes an unknown medium at angle 60° as shown. If the angle of refraction is 30°. Evaluate the refractive index of the medium.
Answer» A light ray from air strikes an unknown medium at angle 60° as shown. If the angle of refraction is 30°. Evaluate the refractive index of the medium.

Discussion

36.	A conducting circular loop of radius r carries a constant current i . It is placed in uniform magnetic field B , such that B is perpendicular to the plane of the loop . The net magnetic force acting on the loop is
Answer» A conducting circular loop of radius r carries a constant current i . It is placed in uniform magnetic field B , such that B is perpendicular to the plane of the loop . The net magnetic force acting on the loop is

Discussion

37.	An electric fan runs from the 230 V mains. The current flowing through it is 0.4 A. At what rate is electrical energy transferred by the fan ?
Answer» An electric fan runs from the 230 V mains. The current flowing through it is 0.4 A. At what rate is electrical energy transferred by the fan ?

Discussion

38.	What will happen to a lead storage battery if density of H2SO4 becomes more than 1.3 g/cc
Answer» What will happen to a lead storage battery if density of H2SO4 becomes more than 1.3 g/cc

Discussion

39.	In nuclear fission, which will have greater mass among reactant and product?
Answer» In nuclear fission, which will have greater mass among reactant and product?

Discussion

40.	at every instant ratio of magnitude of electric field to the magnetic field for an electromagnetic wave in vacuum is equal to speed of radiowavesspeed of gamma raysspeed of lightall of aboveWHY NOT OPTION 4 AS EMW ALSO TRAVEL WITH SPEED OF LIGHT??
Answer» at every instant ratio of magnitude of electric field to the magnetic field for an electromagnetic wave in vacuum is equal to speed of radiowaves speed of gamma rays speed of light all of above WHY NOT OPTION 4 AS EMW ALSO TRAVEL WITH SPEED OF LIGHT??

Discussion

41.	What is a circuit diagram? Draw the labeled diagram of an electric circuit comprising of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance: an ammeter or a voltmeter?
Answer» What is a circuit diagram? Draw the labeled diagram of an electric circuit comprising of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance: an ammeter or a voltmeter?

Discussion

42.	Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
Answer» Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.

Discussion

43.	Equivalent resistance across diagonal of a cube where each edge has a resistor of resistance r
Answer» Equivalent resistance across diagonal of a cube where each edge has a resistor of resistance r

Discussion

44.	Eectric field lines about a negative point charge are-(1)circular,anticlockwise (2)circular,clockwise (3)radial,inwards (4)radial,outwards-which is correct and why?
Answer» Eectric field lines about a negative point charge are-(1)circular,anticlockwise (2)circular,clockwise (3)radial,inwards (4)radial,outwards-which is correct and why?

Discussion

45.	Compare the sun and the fossil fuels as the sources of energy.
Answer» Compare the sun and the fossil fuels as the sources of energy.

Discussion

46.	Speeds of two identical cars are u and 4u at a specified instant the ratio of the respective distance at which the two cars are stopped from that instant age
Answer» Speeds of two identical cars are u and 4u at a specified instant the ratio of the respective distance at which the two cars are stopped from that instant age

Discussion

47.	What is the SI unit of current?
Answer» What is the SI unit of current?

Discussion

48.	If the reflected ray is making 30° with the surface, find the angle of incidence.
Answer» If the reflected ray is making 30° with the surface, find the angle of incidence.

Discussion

49.	Choose the correct statement: Statement 1: A body moves along the direction of force. Statement 2: A body moves in the direction of velocity. Statement 3: Forces acting inside the system are called pseudo forces. Statement 4: Forces acting outside the system are called external forces.
Answer» Choose the correct statement: Statement 1: A body moves along the direction of force. Statement 2: A body moves in the direction of velocity. Statement 3: Forces acting inside the system are called pseudo forces. Statement 4: Forces acting outside the system are called external forces.

49.

Choose the correct statement: Statement 1: A body moves along the direction of force. Statement 2: A body moves in the direction of velocity. Statement 3: Forces acting inside the system are called pseudo forces. Statement 4: Forces acting outside the system are called external forces.

Answer»

Choose the correct statement:

Statement 1: A body moves along the direction of force.

Statement 2: A body moves in the direction of velocity.

Statement 3: Forces acting inside the system are called pseudo forces.

Statement 4: Forces acting outside the system are called external forces.

Discussion

50.	13.two points having charges q1 and q2 are placed at the coordinates a,0,0 and 0,b,0 respectively.find out the electric feild intensity of a thrid point charge placed at 0,0,c due to those two charges.
Answer» 13.two points having charges q1 and q2 are placed at the coordinates a,0,0 and 0,b,0 respectively.find out the electric feild intensity of a thrid point charge placed at 0,0,c due to those two charges.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In which of the following cases light bends towards the normal ray?

what is the diameter (cm) of eyeball in normal adult eye

Relative velocity

Ring of radius R and resistance R is falling vertically along 2 frictionless vertical conducting drills which are connected at the top if a current I is induced in the connected ab when the speed of the wind is V then the magnitude of the magnetic field is

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

Why is the resistance less when resistors are joined in parallel?

Conventional direction of electric current is from

How did Avogadro got 6.022×10²³

A second order system is generated by¨y(t)+˙y(t)−2y(t)=u(t)A closed loop system is designed with unity negative feedback using above system and proportional controller with gian Kp.The closed loop system will remain stable for

What is common among the following images?

Question 16Why do bulbs have two terminals?

a calorimeter contains 10g of water at 20degreeC.the temperature falls to 15degrreeC in 10min.when calorimeter contains 20g of water at20degreeC, it takes 15 min for the temperature to become 15degrreeC.the water equivalent of the calorimeter is

One type of energy which has not been controlled so far is : (a) ocean thermal energy (b) nuclear fusion energy (c) geothermal energy (d) nuclear fission energy

Radius of moon is 1/4 times that of earth and mass is 1/81 times that of earth.Tthe point at which gravitational field due to earth becomes equal and opposite to that of moon is?\lbrack dis†an ce between centers of earth and moon is 60 R,where R is radius of the earth\rbrack

Give a method to conserve energy at school.

In which of the following circuit(s) will an ammeter and a voltmeter work properly and show the correct reading?

A square loop of side 2a, and carrying current I, is kept in XZ plane with its centre at origin. A long wire carrying the same current I is placed parallel to the z−axis and passing through the point (0,b,0) (b&gt;&gt;a). The magnitude of the torque on the loop about z−axis is given by:

Which of the following change occurs during evaporation?

Mx and My denote the atomic masses of parent and daughter nuclei respectively in a radiaoactive decay. If Q value of B+ decay is Q1, then value of Q1 is (me : mass of electron)

Out of the two lenses of focal length 20cm and 40cm, which lens is used to get more convergent light???

A vernier scale with }10 divisions slides over a main }{ scale whose pitch is }0.5mm (pitch }=1MSD) . If a }} bob of diameter }9.75mm is held between the jaws, } determine the M.S.R.R and VC.D if } (a) there is no zero error. } (b) the zero error }=0.35mm.

At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object? Draw a figure.

A uniform cylindrical coil in vacuum has r1= 1m, l1=1 m and 100 turns.Co axial and at the center of this coil is a smaller coil of r2= 10 cm, l2=10 cmand 10 turns. What is the mutual inductance of the two coils?

If the speed of a charge particles moving through a magnetic field is increased then they radius of curvature of it circular path will

In Tyndall effect, the colour of light that is scattered depends on:

In lens makers formula if R1 and R2 are equal then f becomes infinite how? Does any condition exists like R1= R2? For a double convex/concave lens how R1 ≠ R2?

the energy required to convert all atoms presrent in 1.2g magnesium to magmnesium to mg^{2+} ions if lE,and lE_2 of magnesium are 120kj mol^{-1 }and 240 kj mol^{-1 }respectivel

The Laplace transform of e−4tsin3tt is

Following figures show the arrangement of bar magnetism in different configurations. Each magnet has magnetic dipole moment →m . Which configuration has highest net magnetic dipole moment ?

If 1 g of Hydrogen is converted into 0.993 g of Helium in a thermonuclear reaction, then the energy released is

A light ray from air strikes an unknown medium at angle 60° as shown. If the angle of refraction is 30°. Evaluate the refractive index of the medium.

A conducting circular loop of radius r carries a constant current i . It is placed in uniform magnetic field B , such that B is perpendicular to the plane of the loop . The net magnetic force acting on the loop is

An electric fan runs from the 230 V mains. The current flowing through it is 0.4 A. At what rate is electrical energy transferred by the fan ?

What will happen to a lead storage battery if density of H2SO4 becomes more than 1.3 g/cc

In nuclear fission, which will have greater mass among reactant and product?

at every instant ratio of magnitude of electric field to the magnetic field for an electromagnetic wave in vacuum is equal to speed of radiowavesspeed of gamma raysspeed of lightall of aboveWHY NOT OPTION 4 AS EMW ALSO TRAVEL WITH SPEED OF LIGHT??

What is a circuit diagram? Draw the labeled diagram of an electric circuit comprising of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance: an ammeter or a voltmeter?

Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.

Equivalent resistance across diagonal of a cube where each edge has a resistor of resistance r

Eectric field lines about a negative point charge are-(1)circular,anticlockwise (2)circular,clockwise (3)radial,inwards (4)radial,outwards-which is correct and why?

Compare the sun and the fossil fuels as the sources of energy.

Speeds of two identical cars are u and 4u at a specified instant the ratio of the respective distance at which the two cars are stopped from that instant age

What is the SI unit of current?

If the reflected ray is making 30° with the surface, find the angle of incidence.

Choose the correct statement: Statement 1: A body moves along the direction of force. Statement 2: A body moves in the direction of velocity. Statement 3: Forces acting inside the system are called pseudo forces. Statement 4: Forces acting outside the system are called external forces.

13.two points having charges q1 and q2 are placed at the coordinates a,0,0 and 0,b,0 respectively.find out the electric feild intensity of a thrid point charge placed at 0,0,c due to those two charges.

A square loop of side 2a, and carrying current I, is kept in XZ plane with its centre at origin. A long wire carrying the same current I is placed parallel to the z−axis and passing through the point (0,b,0) (b>>a). The magnitude of the torque on the loop about z−axis is given by: