16569 + Interview Questions in Physics

1.	Which of the following cannot be explained using Bernoulli's principle?
Answer» Which of the following cannot be explained using Bernoulli's principle?

Discussion

2.	When a potential difference of 2v is applied across the end of a wire of 5 m length a current 1 amp flows through it calculate (a) the resistance across the ends of the wire if it is doubled on itself
Answer» When a potential difference of 2v is applied across the end of a wire of 5 m length a current 1 amp flows through it calculate (a) the resistance across the ends of the wire if it is doubled on itself

2.

When a potential difference of 2v is applied across the end of a wire of 5 m length a current 1 amp flows through it calculate (a) the resistance across the ends of the wire if it is doubled on itself

Answer»

When a potential difference of 2v is applied across the end of a wire of 5 m length a current 1 amp flows through it calculate

(a) the resistance across the ends of the wire if it is doubled on itself

Discussion

3.	In a simple machine, if the effort arm is doubled and the load arm is halved, then how does the velocity ratio (VR) change?
Answer» In a simple machine, if the effort arm is doubled and the load arm is halved, then how does the velocity ratio (VR) change?

3.

In a simple machine, if the effort arm is doubled and the load arm is halved, then how does the velocity ratio (VR) change?

Answer»

In a simple machine, if the effort arm is doubled and the load arm is halved, then how does the velocity ratio (VR) change?

Discussion

4.	The potential difference applied to an X -ray tube is 5 kV and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is
Answer» The potential difference applied to an X -ray tube is 5 kV and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is

Discussion

5.	In the figure given, the electric current flowing throught he 5 kΩ resistor is ′x′mA.The value of x to the nearest integer is
Answer» In the figure given, the electric current flowing throught he $5 k Ω$ resistor is $^{'} x^{'} mA$ . The value of $x$ to the nearest integer is

Discussion

6.	The source voltage and current in the circuit are represented by the following equations-E = 110 sin (wt + pi/6) volt, I = 5 sin (wt - pi/6) ampereFind power factor with nature
Answer» The source voltage and current in the circuit are represented by the following equations- E = 110 sin (wt + pi/6) volt, I = 5 sin (wt - pi/6) ampere Find power factor with nature

Discussion

7.	If the above bar magnet is broken along the middle line, then how many north poles and south poles will be formed?
Answer» If the above bar magnet is broken along the middle line, then how many north poles and south poles will be formed?

Discussion

8.	Is metallic wire carrying current charged or electrically neutral?Justig your answer.
Answer» Is metallic wire carrying current charged or electrically neutral?Justig your answer.

Discussion

9.	To maintain the Zener diode in the "on" state, the maximum value of input voltage Vi is _____V.Given R = 220 ohm.36.87
Answer» To maintain the Zener diode in the "on" state, the maximum value of input voltage $V_{i}$ is _____V. Given R = 220 ohm. 36.87

Discussion

10.	signs of focal length ,object dis†an ce ,image dis†an ce in simple microscope?
Answer» signs of focal length ,object dis†an ce ,image dis†an ce in simple microscope?

Discussion

11.	a simple pendulum consists of small sphere charge q. the pendulum is placed in a uniform electric field of strenght e directed vertically downward. find the period of oscillation of pendulum due to the electrostatic force acting on the sphere, neglecting the effect of the gravitational force.
Answer» a simple pendulum consists of small sphere charge q. the pendulum is placed in a uniform electric field of strenght e directed vertically downward. find the period of oscillation of pendulum due to the electrostatic force acting on the sphere, neglecting the effect of the gravitational force.

Discussion

12.	Choose which of the following options are correct.
Answer» Choose which of the following options are correct.

Discussion

13.	A magnifying glass is a combination of a convex lens of focal length 5cm and a concave lens of power -5D.If the dis†an ce of distinct vision is 20cm,calculate the magnifying power of the magnifying glass.
Answer» A magnifying glass is a combination of a convex lens of focal length 5cm and a concave lens of power -5D.If the dis†an ce of distinct vision is 20cm,calculate the magnifying power of the magnifying glass.

Discussion

14.	23. Why gases is present in the form of real not in ideal form
Answer» 23. Why gases is present in the form of real not in ideal form

Discussion

15.	A coin falls freely from the height of 19.6m. Calculate its final velocity before touching the ground?
Answer» A coin falls freely from the height of 19.6m. Calculate its final velocity before touching the ground?

Discussion

16.	23.The two nearest harmonic of a tube closed at one end and open at other end are 220hz and 260Hz. What is the fundamental frequency of the system 1)10Hz 2)20Hz 3)30Hz 4)40Hz
Answer» 23.The two nearest harmonic of a tube closed at one end and open at other end are 220hz and 260Hz. What is the fundamental frequency of the system 1)10Hz 2)20Hz 3)30Hz 4)40Hz

Discussion

17.	focal length of objective lens and eye piece of an astronomical telescope are 200 cm and 10 cm respectively. the length of telescope for maximum magnification is nearly
Answer» focal length of objective lens and eye piece of an astronomical telescope are 200 cm and 10 cm respectively. the length of telescope for maximum magnification is nearly

Discussion

18.	The major environmental problem in harnessing nuclear energy is how to ___.
Answer» The major environmental problem in harnessing nuclear energy is how to ___.

Discussion

19.	A bomb of mass 3Kg at rest explodes in air into two pieces of masses 2Kg and 1Kg the smaller mass goes at a speed of 80m/s the total energy imparted to the two fragments is
Answer» A bomb of mass 3Kg at rest explodes in air into two pieces of masses 2Kg and 1Kg the smaller mass goes at a speed of 80m/s the total energy imparted to the two fragments is

Discussion

20.	Calculate the height through which a body of mass 0.5 kg should be lifted if the energy spent for doing so is 1 joule take g=10 m/second square
Answer» Calculate the height through which a body of mass 0.5 kg should be lifted if the energy spent for doing so is 1 joule take g=10 m/second square

Discussion

21.	circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of 2nd coil. What is the ratio of potential difference applied across them so that the magnetic field attheir centres is the same?
Answer» circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of 2nd coil. What is the ratio of potential difference applied across them so that the magnetic field attheir centres is the same?

Discussion

22.	The minimum energy required to excite a hydrogen atom from its ground state is
Answer» The minimum energy required to excite a hydrogen atom from its ground state is

Discussion

23.	Name the spherical mirror which can produce a virtual and diminished image of an object.
Answer» Name the spherical mirror which can produce a virtual and diminished image of an object.

Discussion

24.	It is desired to obtain the erect image of an object using convex lens of focal length 20cm. A) what should be the range of object distance from the lens? B) will the image be bigger or smaller?
Answer» It is desired to obtain the erect image of an object using convex lens of focal length 20cm. A) what should be the range of object distance from the lens? B) will the image be bigger or smaller?

Discussion

25.	The velocity of most energetic electron emitted from a metallic surface is tripled when the frequency v of the incident radiation is doubled. The work function of this metal will be (h is Planck's constant)
Answer» The velocity of most energetic electron emitted from a metallic surface is tripled when the frequency v of the incident radiation is doubled. The work function of this metal will be (h is Planck's constant)

Discussion

26.	The Least Count Of A Voltmeter And An Ammeter Are 0.1 V And 0.1 A Respectively.If The Current Flowing Across A Resistor Having Potential Difference Of 10 V Is 1 A, Find The Percentage Of Error In The Calculation Of The Resistance.
Answer» The Least Count Of A Voltmeter And An Ammeter Are 0.1 V And 0.1 A Respectively.If The Current Flowing Across A Resistor Having Potential Difference Of 10 V Is 1 A, Find The Percentage Of Error In The Calculation Of The Resistance.

Discussion

27.	Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.
Answer» Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

Discussion

28.	Question 1 (a) Fill in the blank: A device that is used to break an electric circuit is called ___.
Answer» Question 1 (a) Fill in the blank: A device that is used to break an electric circuit is called ___.

28.

Question 1 (a) Fill in the blank: A device that is used to break an electric circuit is called ___.

Answer»

Question 1 (a)

Fill in the blank:

A device that is used to break an electric circuit is called ___.

Discussion

29.	For driving a current of 3 A for 5 minutes in an electrical circuit, 900 joule of work is to be done. Find the emf of the source in the circuit.
Answer» For driving a current of $3 A$ for $5$ minutes in an electrical circuit, $900$ joule of work is to be done. Find the emf of the source in the circuit.

Discussion

30.	A fully fueled rocket has of 21\ast10^3 kg of which 15\ast10^3 kg is liquid fuel. the exhaust gas is exahusted at rate of 190 kg/s at aspeed of 2.8\ast10^3 m/s relative to the rocket . if the rocket is fired verticlly upward , calculate 1)the trust of the rocket ,2) the force on the rocket at blast off.
Answer» A fully fueled rocket has of 21\ast10^3 kg of which 15\ast10^3 kg is liquid fuel. the exhaust gas is exahusted at rate of 190 kg/s at aspeed of 2.8\ast10^3 m/s relative to the rocket . if the rocket is fired verticlly upward , calculate 1)the trust of the rocket ,2) the force on the rocket at blast off.

Discussion

31.	In a filament type light bulb, most of the electric power consumed appears as: (a) visible light (b) infra - red - rays (c) ultravioley rays (d) fluorescent light
Answer» In a filament type light bulb, most of the electric power consumed appears as: (a) visible light (b) infra - red - rays (c) ultravioley rays (d) fluorescent light

Discussion

32.	138.What is the concept of conversion of 1)galvanometer into a ammeter ? 2)galvanometer into a voltmeter ?
Answer» 138.What is the concept of conversion of 1)galvanometer into a ammeter ? 2)galvanometer into a voltmeter ?

Discussion

33.	Write two forms in which solar energy manifests itself in the sea.
Answer» Write two forms in which solar energy manifests itself in the sea.

Discussion

34.	A 1,000 kg car moving at a speed of 20ms−1 is brought to rest at a distance of 50 m, calculate the unbalanced force acting on the car and give a reason why the actual force applied by the brakes may be slightly less than that calculated?
Answer» A 1,000 kg car moving at a speed of $20 m s^{- 1}$ is brought to rest at a distance of 50 m, calculate the unbalanced force acting on the car and give a reason why the actual force applied by the brakes may be slightly less than that calculated?

Discussion

35.	In an ammeter 0.2% af main current passes through the galvanometer. If rasistame of gatanameler is G, than resistance of ammeter will be
Answer» In an ammeter 0.2% af main current passes through the galvanometer. If rasistame of gatanameler is G, than resistance of ammeter will be

Discussion

36.	How to distribute current in parallel and series combination?
Answer» How to distribute current in parallel and series combination?

Discussion

37.	A parallel combination of 3 resistors takes a net current of 7.5A from a supply of 30 V. If 2 resistors are 10 ohm and 12 ohm.Find third resistor
Answer» A parallel combination of 3 resistors takes a net current of 7.5A from a supply of 30 V. If 2 resistors are 10 ohm and 12 ohm.Find third resistor

Discussion

38.	Rainbows are formed due to ________.
Answer» Rainbows are formed due to ________.

Discussion

39.	36 Calculate the energy associated with the first orbit of Li positive and what is the radius of the orbit
Answer» 36 Calculate the energy associated with the first orbit of Li positive and what is the radius of the orbit

Discussion

40.	Difference between electric potential and electric potential energy
Answer» Difference between electric potential and electric potential energy

Discussion

41.	Vibration can be defined as the
Answer» Vibration can be defined as the

Discussion

42.	50. A : Specific conductance of an electrolyte decreases with increase in dilution R : On dilution, number of ions in solution decreases
Answer» 50. A : Specific conductance of an electrolyte decreases with increase in dilution R : On dilution, number of ions in solution decreases

Discussion

43.	If R is the radius of earth and ω is its angular velocity and ge is the acceleration of gravity at the equator. The effective value of acceleration due to gravity at the latitude λ=300 will be equal to
Answer» If R is the radius of earth and ω is its angular velocity and $g_{e}$ is the acceleration of gravity at the equator. The effective value of acceleration due to gravity at the latitude λ= $30^{0}$ will be equal to

Discussion

44.	a solid current carrying conductor of radius R is having current per unit area (J) as J= α r/R where α is a cons†an t and r is a dis†an ce from axis. Find magnetic field at dis†an ce x from of wire. Asume x
Answer» a solid current carrying conductor of radius R is having current per unit area (J) as J= α r/R where α is a cons†an t and r is a dis†an ce from axis. Find magnetic field at dis†an ce x from of wire. Asume x

Discussion

45.	With respect to air, the refractive index of a flint glass and alcohol is 1.6 and 1.3 respectively. The refractive index of the flint glass with respect to alcohol is_______.
Answer» With respect to air, the refractive index of a flint glass and alcohol is $1.6$ and $1.3$ respectively. The refractive index of the flint glass with respect to alcohol is_______.

Discussion

46.	Copper matte contains 1. Only Cu2S 2. Only CuO 3. Cu2S & FeS 4. Cu2S & Cu
Answer» Copper matte contains 1. Only Cu2S 2. Only CuO 3. Cu2S & FeS 4. Cu2S & Cu

Discussion

47.	The refractive index of ruby is 1.71. what is meant by this statement
Answer» The refractive index of ruby is 1.71. what is meant by this statement

Discussion

48.	64. Why p.d does not change when an element is joined in parallel and electric current does not change when an element is joined in series?
Answer» 64. Why p.d does not change when an element is joined in parallel and electric current does not change when an element is joined in series?

Discussion

49.	An object is placed at a distance of 75 cm from a screen. Two positions of a convex lens of focal length 12 cm are placed so as to obtain a real image are
Answer» An object is placed at a distance of 75 cm from a screen. Two positions of a convex lens of focal length 12 cm are placed so as to obtain a real image are

Discussion

50.	Question 18Unit of electric power may also be expressed as(a) volt ampere(b) kilowatt hour(c) watt second(d) joule second
Answer» Question 18 Unit of electric power may also be expressed as (a) volt ampere (b) kilowatt hour (c) watt second (d) joule second

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following cannot be explained using Bernoulli's principle?

When a potential difference of 2v is applied across the end of a wire of 5 m length a current 1 amp flows through it calculate (a) the resistance across the ends of the wire if it is doubled on itself

In a simple machine, if the effort arm is doubled and the load arm is halved, then how does the velocity ratio (VR) change?

The potential difference applied to an X -ray tube is 5 kV and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is

In the figure given, the electric current flowing throught he 5 kΩ resistor is ′x′mA.The value of x to the nearest integer is

The source voltage and current in the circuit are represented by the following equations-E = 110 sin (wt + pi/6) volt, I = 5 sin (wt - pi/6) ampereFind power factor with nature

If the above bar magnet is broken along the middle line, then how many north poles and south poles will be formed?

Is metallic wire carrying current charged or electrically neutral?Justig your answer.

To maintain the Zener diode in the "on" state, the maximum value of input voltage Vi is _____V.Given R = 220 ohm.36.87

signs of focal length ,object dis†an ce ,image dis†an ce in simple microscope?

a simple pendulum consists of small sphere charge q. the pendulum is placed in a uniform electric field of strenght e directed vertically downward. find the period of oscillation of pendulum due to the electrostatic force acting on the sphere, neglecting the effect of the gravitational force.

Choose which of the following options are correct.

A magnifying glass is a combination of a convex lens of focal length 5cm and a concave lens of power -5D.If the dis†an ce of distinct vision is 20cm,calculate the magnifying power of the magnifying glass.

23. Why gases is present in the form of real not in ideal form

A coin falls freely from the height of 19.6m. Calculate its final velocity before touching the ground?

23.The two nearest harmonic of a tube closed at one end and open at other end are 220hz and 260Hz. What is the fundamental frequency of the system 1)10Hz 2)20Hz 3)30Hz 4)40Hz

focal length of objective lens and eye piece of an astronomical telescope are 200 cm and 10 cm respectively. the length of telescope for maximum magnification is nearly

The major environmental problem in harnessing nuclear energy is how to ___.

A bomb of mass 3Kg at rest explodes in air into two pieces of masses 2Kg and 1Kg the smaller mass goes at a speed of 80m/s the total energy imparted to the two fragments is

Calculate the height through which a body of mass 0.5 kg should be lifted if the energy spent for doing so is 1 joule take g=10 m/second square

circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of 2nd coil. What is the ratio of potential difference applied across them so that the magnetic field attheir centres is the same?

The minimum energy required to excite a hydrogen atom from its ground state is

Name the spherical mirror which can produce a virtual and diminished image of an object.

It is desired to obtain the erect image of an object using convex lens of focal length 20cm. A) what should be the range of object distance from the lens? B) will the image be bigger or smaller?

The velocity of most energetic electron emitted from a metallic surface is tripled when the frequency v of the incident radiation is doubled. The work function of this metal will be (h is Planck's constant)

The Least Count Of A Voltmeter And An Ammeter Are 0.1 V And 0.1 A Respectively.If The Current Flowing Across A Resistor Having Potential Difference Of 10 V Is 1 A, Find The Percentage Of Error In The Calculation Of The Resistance.

Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

Question 1 (a) Fill in the blank: A device that is used to break an electric circuit is called ___.

For driving a current of 3 A for 5 minutes in an electrical circuit, 900 joule of work is to be done. Find the emf of the source in the circuit.

In a filament type light bulb, most of the electric power consumed appears as: (a) visible light (b) infra - red - rays (c) ultravioley rays (d) fluorescent light

138.What is the concept of conversion of 1)galvanometer into a ammeter ? 2)galvanometer into a voltmeter ?

Write two forms in which solar energy manifests itself in the sea.

A 1,000 kg car moving at a speed of 20ms−1​ is brought to rest at a distance of 50 m, calculate the unbalanced force acting on the car and give a reason why the actual force applied by the brakes may be slightly less than that calculated?

In an ammeter 0.2% af main current passes through the galvanometer. If rasistame of gatanameler is G, than resistance of ammeter will be

How to distribute current in parallel and series combination?

A parallel combination of 3 resistors takes a net current of 7.5A from a supply of 30 V. If 2 resistors are 10 ohm and 12 ohm.Find third resistor

Rainbows are formed due to ________.

36 Calculate the energy associated with the first orbit of Li positive and what is the radius of the orbit

Difference between electric potential and electric potential energy

Vibration can be defined as the

50. A : Specific conductance of an electrolyte decreases with increase in dilution R : On dilution, number of ions in solution decreases

If R is the radius of earth and ω is its angular velocity and ge is the acceleration of gravity at the equator. The effective value of acceleration due to gravity at the latitude λ=300 will be equal to

a solid current carrying conductor of radius R is having current per unit area (J) as J= α r/R where α is a cons†an t and r is a dis†an ce from axis. Find magnetic field at dis†an ce x from of wire. Asume x

With respect to air, the refractive index of a flint glass and alcohol is 1.6 and 1.3 respectively. The refractive index of the flint glass with respect to alcohol is_______.

Copper matte contains 1. Only Cu2S 2. Only CuO 3. Cu2S & FeS 4. Cu2S & Cu

The refractive index of ruby is 1.71. what is meant by this statement

64. Why p.d does not change when an element is joined in parallel and electric current does not change when an element is joined in series?

An object is placed at a distance of 75 cm from a screen. Two positions of a convex lens of focal length 12 cm are placed so as to obtain a real image are

Question 18Unit of electric power may also be expressed as(a) volt ampere(b) kilowatt hour(c) watt second(d) joule second

A 1,000 kg car moving at a speed of 20ms−1 is brought to rest at a distance of 50 m, calculate the unbalanced force acting on the car and give a reason why the actual force applied by the brakes may be slightly less than that calculated?