16569 + Interview Questions in Physics Page 29 InterviewSolution

1401.	If fire does not have mass than how does it get affected by gravity (shape) and not light
Answer» If fire does not have mass than how does it get affected by gravity (shape) and not light

Discussion

1402.	The number of electrons present in 8 coulomb of charge
Answer» The number of electrons present in 8 coulomb of charge

Discussion

1403.	Explain the principle involved in electrical generator.
Answer» Explain the principle involved in electrical generator.

Discussion

1404.	In the ray diagram shown in the figure, find the total deviation by the prism.
Answer» In the ray diagram shown in the figure, find the total deviation by the prism.

Discussion

1405.	A current carrying conductor placed in magnetic field experiences a force. The amount of force experienced by a current carrying conductor in magnetic field can be increased by:
Answer» A current carrying conductor placed in magnetic field experiences a force. The amount of force experienced by a current carrying conductor in magnetic field can be increased by:

Discussion

1406.	13. A ray of light incident at a angle of 37 degree on a face of equilateral prism get deviated through 42 degree . Find the angle of deviation and emergence ?
Answer» 13. A ray of light incident at a angle of 37 degree on a face of equilateral prism get deviated through 42 degree . Find the angle of deviation and emergence ?

Discussion

1407.	Question 1Define 1 dioptre of power of a lens.
Answer» Question 1 Define 1 dioptre of power of a lens.

Discussion

1408.	a body of mass 5 kg is moving with constahnt speed 3 m/s find average speed force for 5 s
Answer» a body of mass 5 kg is moving with constahnt speed 3 m/s find average speed force for 5 s

Discussion

1409.	A point charge q is kept d distance away from the hollow neutral conductor of radius R.What is the potential at point B lying on the surface of the conductor??
Answer» A point charge q is kept d distance away from the hollow neutral conductor of radius R.What is the potential at point B lying on the surface of the conductor??

Discussion

1410.	A toaster produces more heat than a bulb when connected in parallel.Which has a greater resistance? And why?
Answer» A toaster produces more heat than a bulb when connected in parallel.Which has a greater resistance? And why?

Discussion

1411.	Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb
Answer» Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb

Discussion

1412.	For C1=C2=C3=4μF, what is the work done by the battery till the capacitors are fully charged?
Answer» For $C_{1} = C_{2} = C_{3} = 4 μ F$ , what is the work done by the battery till the capacitors are fully charged?

Discussion

1413.	When a body vibrates under a periodic force, the vibration of the body is called:
Answer» When a body vibrates under a periodic force, the vibration of the body is called:

Discussion

1414.	Name any three forms of energy which could be harnessed from the sea.
Answer» Name any three forms of energy which could be harnessed from the sea.

Discussion

1415.	What will be internal energy change, heat change and work done for the reversible melting of solid benzene at 1 atm and normal melting point. Options: 1. q>0 2. w0 4. All of these
Answer» What will be internal energy change, heat change and work done for the reversible melting of solid benzene at 1 atm and normal melting point. Options: 1. q>0 2. w<0 3. E>0 4. All of these

Discussion

1416.	ntQ) Two parallel long wires carrying current i1 and i2 with i1> 12 . When th currents are in the same direction , then the magnetic field at a point midway b/w the wires is 10 micro T. If the direction of i2 is reversed then the field becomes 30 micro T . THE ratio of currents will ben nta) 4n ntb) 3n ntc)2n ntd) 1n
Answer» ntQ) Two parallel long wires carrying current i1 and i2 with i1> 12 . When th currents are in the same direction , then the magnetic field at a point midway b/w the wires is 10 micro T. If the direction of i2 is reversed then the field becomes 30 micro T . THE ratio of currents will ben nta) 4n ntb) 3n ntc)2n ntd) 1n

Discussion

1417.	A lawn roller is displaced through 1km using a force of 200N in a direction making an angle of 600 with the lawn. The work done is
Answer» A lawn roller is displaced through 1km using a force of 200N in a direction making an angle of $60^{0}$ with the lawn. The work done is

Discussion

1418.	Four wires each of the same length, diameter and material are connected to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite corners is :
Answer» Four wires each of the same length, diameter and material are connected to form a square. If the resistance of each wire is $R,$ then equivalent resistance across the opposite corners is :

Discussion

1419.	The magnifying power of a telescope at normal adjustment with tube length 60 cm is 5. What is the focal length of its eye piece?
Answer» The magnifying power of a telescope at normal adjustment with tube length $60 cm$ is $5$ . What is the focal length of its eye piece?

Discussion

1420.	Electric current is the ________ of flow of electric _______.
Answer» Electric current is the ________ of flow of electric _______.

Discussion

1421.	Hydrogen is a burning gas. Similarly oxygen helps burning but why is water (H2O) not burning ?
Answer» Hydrogen is a burning gas. Similarly oxygen helps burning but why is water (H2O) not burning ?

Discussion

1422.	Why does a glass rod acquire positive charge when it is rubbed with silk?
Answer» Why does a glass rod acquire positive charge when it is rubbed with silk?

Discussion

1423.	83. Assertion :Angular frequency of L-C osciuations 2 rad/s and maximum current in the circuit is 1 A. Then maximum changeof current should be 2 A/s Reason : (dI/dt)max = Imax ?
Answer» 83. Assertion :Angular frequency of L-C osciuations 2 rad/s and maximum current in the circuit is 1 A. Then maximum changeof current should be 2 A/s Reason : (dI/dt)max = Imax ?

Discussion

1424.	An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?
Answer» An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?

Discussion

1425.	What is relative strength between the different fundamental forces
Answer» What is relative strength between the different fundamental forces

Discussion

1426.	A block of mass 'm' is pulled by a constant power P on a rough horizontal plane. The friction coefficient between the block and the plane is (f). The maximum velocity attained by the block is how much?
Answer» A block of mass 'm' is pulled by a constant power P on a rough horizontal plane. The friction coefficient between the block and the plane is (f). The maximum velocity attained by the block is how much?

Discussion

1427.	Consider the following statement about the International Nuclear and Radiological Event (INES) scale: Which of the above statements is/are incorrect
Answer» Consider the following statement about the International Nuclear and Radiological Event (INES) scale: Which of the above statements is/are incorrect

1427.

Consider the following statement about the International Nuclear and Radiological Event (INES) scale: Which of the above statements is/are incorrect

Answer»

Consider the following statement about the International Nuclear and Radiological Event (INES) scale:

Which of the above statements is/are incorrect

Discussion

1428.	The acceleration due to gravity at the surface of the moon is 1.67 msec2. If the radius of the moon is 1.74 × 106 m. Find the mass of the moon. ( Given: G = 6.67 × 10−11 Nm2kg2)
Answer» The acceleration due to gravity at the surface of the moon is 1.67 $\frac{m}{{s e c}^{2}}$ . If the radius of the moon is 1.74 $\times$ $10^{6}$ m. Find the mass of the moon. ( Given: G = 6.67 $\times$ $10^{- 11}$ $\frac{N m^{2}}{{k g}^{2}}$ )

Discussion

1429.	What is a contact force?
Answer» What is a contact force?

Discussion

1430.	A radio operator broadcast on the 6-meter band. The frequency of this electromagnetic radiation is __________ MHz.
Answer» A radio operator broadcast on the 6-meter band. The frequency of this electromagnetic radiation is __________ MHz.

Discussion

1431.	∫3x⋅cosx dx is equal to
Answer» $\int 3^{x} \cdot cos x d x$ is equal to

Discussion

1432.	Find ratio of de broglie wavelength of He at 27°C and N2 at 127°C.Assuming both monoatomic.
Answer» Find ratio of de broglie wavelength of He at 27°C and N2 at 127°C. Assuming both monoatomic.

Discussion

1433.	A student carries out the experiment of tracing the path of ray of light through a rectangular glassslab, for two different values of angle of incidence \angle i = 30 and \angle=45. Find the set of value of angleof refraction (Lr) and the angle of emergence (Le), She is likely to observe in two cases.
Answer» A student carries out the experiment of tracing the path of ray of light through a rectangular glassslab, for two different values of angle of incidence \angle i = 30 and \angle=45. Find the set of value of angleof refraction (Lr) and the angle of emergence (Le), She is likely to observe in two cases.

Discussion

1434.	Differentiate between musical sound and noise.
Answer» Differentiate between musical sound and noise.

Discussion

1435.	12.A dip needle arranged to move freely in the magnetic meridian dips by an angle theta.If the vertical plane in which the needle moves is rotated through an angle alpha to the magnetic meridian, then the needle will dip by an angle a)theta b)alpha c)more than theta d)less than theta
Answer» 12.A dip needle arranged to move freely in the magnetic meridian dips by an angle theta.If the vertical plane in which the needle moves is rotated through an angle alpha to the magnetic meridian, then the needle will dip by an angle a)theta b)alpha c)more than theta d)less than theta

Discussion

1436.	Question 11A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.
Answer» Question 11 A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Discussion

1437.	An electromagnetic wave of frequency 1×1014 Hz is propagating along z-axis. The amplitude of electric field is 4 V/m. If ϵ0=8.8×10−12 C2/N-m2, then the average energy density of electric field will be,
Answer» An electromagnetic wave of frequency $1 \times 10^{14} Hz$ is propagating along z-axis. The amplitude of electric field is $4 V/m$ . If $ϵ_{0} = 8.8 \times 10^{- 12} C^{2} {/N-m}^{2}$ , then the average energy density of electric field will be,

Discussion

1438.	If Observer and Object are present in air medium, then find the net shift in position of object produced due to the combination of glass slabs as seen from the side of an observer O′.
Answer» If Observer and Object are present in air medium, then find the net shift in position of object produced due to the combination of glass slabs as seen from the side of an observer $O^{'}$ .

Discussion

1439.	83.structure of cus04
Answer» 83.structure of cus04

Discussion

1440.	Calculate the electric field in a copper wire of cross-sectional area 2mm^2 carrying a current of 2 ampere; given that resistivity of copper wire is 1.7×10^-8 ohm m.
Answer» Calculate the electric field in a copper wire of cross-sectional area 2mm^2 carrying a current of 2 ampere; given that resistivity of copper wire is 1.7×10^-8 ohm m.

Discussion

1441.	A household uses the following electric appliance a. Refrigerator of rating 400w for 10hrs. b. Two electric fans of rating 80w each for 12hrs each day. c. 6 electric bulbs of rating 18w each for 6hrs each day. Calculate the electric bill of the house for the month of June if the cost of per unit electrical energy is₹3.0
Answer» A household uses the following electric appliance a. Refrigerator of rating 400w for 10hrs. b. Two electric fans of rating 80w each for 12hrs each day. c. 6 electric bulbs of rating 18w each for 6hrs each day. Calculate the electric bill of the house for the month of June if the cost of per unit electrical energy is₹3.0

Discussion

1442.	The field normal to the plane of a wire of N turns and radius r which carries a current I is measured on the axis of coil at a small distance h from the centre of the coil.This is smallest than the field at the centre by the fraction?
Answer» The field normal to the plane of a wire of N turns and radius r which carries a current I is measured on the axis of coil at a small distance h from the centre of the coil.This is smallest than the field at the centre by the fraction?

Discussion

1443.	Write proper words from the following group of words in the blanks.(magnetism, 4.5V, 3.0V, gravitational attraction, potential differences, potential, higher, lower, 0V)A.Water in the waterfall flows from a higher level to the lower level because of ____________.B. In an electric circuit, electron flow a from of point of ________ potential to the point of ____________ potential.C. The differences between the electrostatic potential of the positive end the negative end of an electric cell is the __________ of the cell.D. Three electric cells of potential difference 1.5 V each have been connected as a battery. The potential differences of the battery will be ________ V.E. An electric current flowing in a wire creates __________ around the wire.
Answer» Write proper words from the following group of words in the blanks. (magnetism, 4.5V, 3.0V, gravitational attraction, potential differences, potential, higher, lower, 0V) A.Water in the waterfall flows from a higher level to the lower level because of ____________. B. In an electric circuit, electron flow a from of point of ________ potential to the point of ____________ potential. C. The differences between the electrostatic potential of the positive end the negative end of an electric cell is the __________ of the cell. D. Three electric cells of potential difference 1.5 V each have been connected as a battery. The potential differences of the battery will be ________ V. E. An electric current flowing in a wire creates __________ around the wire.

Discussion

1444.	64.A spring of force constant k is cut into three equal pieces. If these pieces are connected in parallel the force constant of the combination will Be :??
Answer» 64.A spring of force constant k is cut into three equal pieces. If these pieces are connected in parallel the force constant of the combination will Be :??

Discussion

1445.	A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all possible precautions at each step of the experiment. At the end of the experiment, on analysing the measurements, which of the following conclusions is he likely to draw ? (a)∠i=∠e<∠r(b)∠i<∠e<∠r(c)∠i>∠e<∠r(d)∠i=∠e>∠r
Answer» A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all possible precautions at each step of the experiment. At the end of the experiment, on analysing the measurements, which of the following conclusions is he likely to draw ? $(a) ∠ i = ∠ e < ∠ r (b) ∠ i < ∠ e < ∠ r (c) ∠ i > ∠ e < ∠ r (d) ∠ i = ∠ e > ∠ r$

Discussion

1446.	How much electrical energy is consumed when a bulb of 40 W is used for 12.5 hours every day for 30 days?
Answer» How much electrical energy is consumed when a bulb of 40 W is used for 12.5 hours every day for 30 days?

Discussion

1447.	A charged particle of mass a nd charge q travelling with velocity v projected into uniform trandverse mavnetic field if F is the magnetic force then wihch is correct relation 1. F.V >02.F.(VxB) >03.F.B
Answer» A charged particle of mass a nd charge q travelling with velocity v projected into uniform trandverse mavnetic field if F is the magnetic force then wihch is correct relation 1. F.V >0 2.F.(VxB) >0 3.F.B <0 4.F.(VxB)<0 All F ,B V are vectirs

Discussion

1448.	Which of the following is constructed on the principle of electromagnetic induction?
Answer» Which of the following is constructed on the principle of electromagnetic induction?

Discussion

1449.	Derivation of all four equations of motion by KINEMATICS.
Answer» Derivation of all four equations of motion by KINEMATICS.

Discussion

1450.	A uniform chain of length 2m is held onmooth horizontal table so that half of it hangs over the edge. Ifrom rest, the velocity with which it leaves the table nearest to (a) 2 m/s(b) 4 m/s(c) 6 m/s(d) 8 m/s
Answer» A uniform chain of length 2m is held onmooth horizontal table so that half of it hangs over the edge. Ifrom rest, the velocity with which it leaves the table nearest to (a) 2 m/s(b) 4 m/s(c) 6 m/s(d) 8 m/s

Discussion

Explore topic-wise InterviewSolutions in .

If fire does not have mass than how does it get affected by gravity (shape) and not light

The number of electrons present in 8 coulomb of charge

Explain the principle involved in electrical generator.

In the ray diagram shown in the figure, find the total deviation by the prism.

A current carrying conductor placed in magnetic field experiences a force. The amount of force experienced by a current carrying conductor in magnetic field can be increased by:

13. A ray of light incident at a angle of 37 degree on a face of equilateral prism get deviated through 42 degree . Find the angle of deviation and emergence ?

Question 1Define 1 dioptre of power of a lens.

a body of mass 5 kg is moving with constahnt speed 3 m/s find average speed force for 5 s

A point charge q is kept d distance away from the hollow neutral conductor of radius R.What is the potential at point B lying on the surface of the conductor??

A toaster produces more heat than a bulb when connected in parallel.Which has a greater resistance? And why?

Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb

For C1=C2=C3=4μF, what is the work done by the battery till the capacitors are fully charged?

When a body vibrates under a periodic force, the vibration of the body is called:

Name any three forms of energy which could be harnessed from the sea.

What will be internal energy change, heat change and work done for the reversible melting of solid benzene at 1 atm and normal melting point. Options: 1. q>0 2. w0 4. All of these

A lawn roller is displaced through 1km using a force of 200N in a direction making an angle of 600 with the lawn. The work done is

Four wires each of the same length, diameter and material are connected to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite corners is :

The magnifying power of a telescope at normal adjustment with tube length 60 cm is 5. What is the focal length of its eye piece?

Electric current is the ________ of flow of electric _______.

Hydrogen is a burning gas. Similarly oxygen helps burning but why is water (H2O) not burning ?

Why does a glass rod acquire positive charge when it is rubbed with silk?

83. Assertion :Angular frequency of L-C osciuations 2 rad/s and maximum current in the circuit is 1 A. Then maximum changeof current should be 2 A/s Reason : (dI/dt)max = Imax ?

An appliance has three wires of colours red, black and green, and is connected to a three pin plug. The thickest pin is connected to which wire?

What is relative strength between the different fundamental forces

A block of mass 'm' is pulled by a constant power P on a rough horizontal plane. The friction coefficient between the block and the plane is (f). The maximum velocity attained by the block is how much?

Consider the following statement about the International Nuclear and Radiological Event (INES) scale: Which of the above statements is/are incorrect

The acceleration due to gravity at the surface of the moon is 1.67 msec2. If the radius of the moon is 1.74 × 106 m. Find the mass of the moon. ( Given: G = 6.67 × 10−11 Nm2kg2)

What is a contact force?

A radio operator broadcast on the 6-meter band. The frequency of this electromagnetic radiation is __________ MHz.

∫3x⋅cosx dx is equal to

Find ratio of de broglie wavelength of He at 27°C and N2 at 127°C.Assuming both monoatomic.

Differentiate between musical sound and noise.

12.A dip needle arranged to move freely in the magnetic meridian dips by an angle theta.If the vertical plane in which the needle moves is rotated through an angle alpha to the magnetic meridian, then the needle will dip by an angle a)theta b)alpha c)more than theta d)less than theta

Question 11A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

An electromagnetic wave of frequency 1×1014 Hz is propagating along z-axis. The amplitude of electric field is 4 V/m. If ϵ0=8.8×10−12 C2/N-m2, then the average energy density of electric field will be,

If Observer and Object are present in air medium, then find the net shift in position of object produced due to the combination of glass slabs as seen from the side of an observer O′.

83.structure of cus04

Calculate the electric field in a copper wire of cross-sectional area 2mm^2 carrying a current of 2 ampere; given that resistivity of copper wire is 1.7×10^-8 ohm m.

The field normal to the plane of a wire of N turns and radius r which carries a current I is measured on the axis of coil at a small distance h from the centre of the coil.This is smallest than the field at the centre by the fraction?

64.A spring of force constant k is cut into three equal pieces. If these pieces are connected in parallel the force constant of the combination will Be :??

How much electrical energy is consumed when a bulb of 40 W is used for 12.5 hours every day for 30 days?

A charged particle of mass a nd charge q travelling with velocity v projected into uniform trandverse mavnetic field if F is the magnetic force then wihch is correct relation 1. F.V >02.F.(VxB) >03.F.B

Which of the following is constructed on the principle of electromagnetic induction?

Derivation of all four equations of motion by KINEMATICS.

A uniform chain of length 2m is held onmooth horizontal table so that half of it hangs over the edge. Ifrom rest, the velocity with which it leaves the table nearest to (a) 2 m/s(b) 4 m/s(c) 6 m/s(d) 8 m/s

Electric current is the __ of flow of electric _.