16569 + Interview Questions in Physics

1.	what are interstitials ?
Answer» what are interstitials ?

Discussion

2.	Which among the below statements is the correct statement for Ohm’s Law?
Answer» Which among the below statements is the correct statement for Ohm’s Law?

Discussion

3.	Total internal reflection
Answer» Total internal reflection

Discussion

4.	A thin girl & a fat man have same KE. If the ratio of their masses is 4:25, calculate the ratio of their momentum.
Answer» A thin girl & a fat man have same KE. If the ratio of their masses is 4:25, calculate the ratio of their momentum.

Discussion

5.	Question 2List the properties of magnetic lines of force.
Answer» Question 2 List the properties of magnetic lines of force.

Discussion

6.	Consider the following two statements: (A) Linear momentum of a system of particles is zero. (B) Kinetic energy of a system of particles is zero.
Answer» Consider the following two statements: (A) Linear momentum of a system of particles is zero. (B) Kinetic energy of a system of particles is zero.

Discussion

7.	The power of two lenses are +12D and -2D. They are placed incontact on the same axes. What will be the focal length of the combination?
Answer» The power of two lenses are +12D and -2D. They are placed in contact on the same axes. What will be the focal length of the combination?

Discussion

8.	the force of repulsion between two point charges is F , when they are d distance apart if the point charges are replaced by conducting spheres each of radius r and the charges remain same . the separation between the centre of a sphere is d , then force of repulsion between them is
Answer» the force of repulsion between two point charges is F , when they are d distance apart if the point charges are replaced by conducting spheres each of radius r and the charges remain same . the separation between the centre of a sphere is d , then force of repulsion between them is

Discussion

9.	Why Earth wire are long
Answer» Why Earth wire are long

Discussion

10.	Find DC of two lines which are connected by the relations: l-5m+3n=0 & 7l^2 +5m^2-3n^2=0
Answer» Find DC of two lines which are connected by the relations: l-5m+3n=0 & 7l^2 +5m^2-3n^2=0

Discussion

11.	Which of the following is the condition for force multiplier?
Answer» Which of the following is the condition for force multiplier?

Discussion

12.	An object is placed at a distance of 12 cm in front of a concave mirror it forms a real image 4 times larger than the object calculate the distance of the image from the mirror
Answer» An object is placed at a distance of 12 cm in front of a concave mirror it forms a real image 4 times larger than the object calculate the distance of the image from the mirror

Discussion

13.	Fuel formed under the earth's surface by the decomposition of organic matter is called _____.
Answer» Fuel formed under the earth's surface by the decomposition of organic matter is called _____.

Discussion

14.	A metal ball of mass 1 kg is heated by means of a 20 W heater in a room at 20 ∘C. The temperature of the ball becomes steady at 50 ∘C. Assuming Newton's law of cooling and that temperature of the ball rises uniformly from 20 ∘C to 30 ∘C in 5 minutes, find the specific heat capacity of the metal.
Answer» A metal ball of mass $1 kg$ is heated by means of a $20 W$ heater in a room at $20^{\circ} C$ . The temperature of the ball becomes steady at $50^{\circ} C$ . Assuming Newton's law of cooling and that temperature of the ball rises uniformly from $20^{\circ} C$ to $30^{\circ} C$ in $5 minutes$ , find the specific heat capacity of the metal.

Discussion

15.	The mean free path of an electron in a metal is 4 x 10^{-8} m. The electric field which can give on an average 2eV energy to an electron in the metal will be??
Answer» The mean free path of an electron in a metal is 4 x 10^{-8} m. The electric field which can give on an average 2eV energy to an electron in the metal will be??

Discussion

16.	Two long and parallel straight wires A and B, carrying currents of 8.0 A and 5.0 A in the same direction, are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A
Answer» Two long and parallel straight wires $A$ and $B$ , carrying currents of $8.0 A$ and $5.0 A$ in the same direction, are separated by a distance of $4.0 cm$ . Estimate the force on a $10 cm$ section of wire $A$

Discussion

17.	Why bulb glows immediately since drift speed of electrons is 10-4 m/s
Answer» Why bulb glows immediately since drift speed of electrons is 10^-4 m/s

Discussion

18.	a man carries load on his head mives distance of 5m . }W = ? when moves it over an inclined plan
Answer» a man carries load on his head mives distance of 5m . }W = ? when moves it over an inclined plan

Discussion

19.	Which of the following is not combustible?
Answer» Which of the following is not combustible?

Discussion

20.	The magnetic fluxes passing through a closed area kept in a magnetic field Is zero. How will you agree with this
Answer» The magnetic fluxes passing through a closed area kept in a magnetic field Is zero. How will you agree with this

Discussion

21.	what is grounding or earthing
Answer» what is grounding or earthing

Discussion

22.	A black body is at a temperature of 2880 K. Theenergy of radiation emitted by this object with wave length between 250 nm to255 nm is U1, between 500 nm to 505 nm is U2and between 1500 nm to 1505 nm is U3.Then for this situation mark the correct statement
Answer» A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wave length between 250 nm to 255 nm is U₁, between 500 nm to 505 nm is U₂and between 1500 nm to 1505 nm is U₃. Then for this situation mark the correct statement

Discussion

23.	For a given lenght L of a wire carrying current I how many cicular turns woud produce maximum magnetic moment of what value
Answer» For a given lenght L of a wire carrying current I how many cicular turns woud produce maximum magnetic moment of what value

Discussion

24.	A 10 m long potentiometer wire is connected to a battery having a steady voltage a leclanche cell is obtained at 4 m length of wire if the length is kept same but its cross section is doubled the null point will be obtained at
Answer» A 10 m long potentiometer wire is connected to a battery having a steady voltage a leclanche cell is obtained at 4 m length of wire if the length is kept same but its cross section is doubled the null point will be obtained at

Discussion

25.	A square metal wire loop PQRS of side 10 cm and resistance 1 Ω is moved with a constant velocity v in a uniform magnetic field of B=2 Wbm−2, as shown in the figure. The magnetic field lines are perpendicular to the plane of the loop ( directed into the paper). The loop is connected to network ABCD of resistors each of value 3 Ω. The resistance of the lead wires SB and RD are negligible. The speed of the loop so as to have a steady current of 1 mA in the loop is [1 Mark]
Answer» A square metal wire loop $P Q R S$ of side $10 cm$ and resistance $1 Ω$ is moved with a constant velocity $v$ in a uniform magnetic field of $B = 2 {Wbm}^{- 2}$ , as shown in the figure. The magnetic field lines are perpendicular to the plane of the loop ( directed into the paper). The loop is connected to network $A B C D$ of resistors each of value $3 Ω$ . The resistance of the lead wires $S B and R D$ are negligible. The speed of the loop so as to have a steady current of $1 mA$ in the loop is $[$ 1 Mark $]$

Discussion

26.	What is the use of inverse square law??
Answer» What is the use of inverse square law??

Discussion

27.	31.Fig. (A) and (B) show two R-L circuits. Growth of current in the two circuits is a shown in fig. (c). It can be inferred that (assume equal V in both cases) : (a)R1>R2 (b)R1L2 (d)L1
Answer» 31.Fig. (A) and (B) show two R-L circuits. Growth of current in the two circuits is a shown in fig. (c). It can be inferred that (assume equal V in both cases) : (a)R1>R2 (b)R1L2 (d)L1

Discussion

28.	Calculate the gravitational potential at centre of the base of a hollow hemisphere of mass M and radius R.(Assume the base of hemisphere to be open)
Answer» Calculate the gravitational potential at centre of the base of a hollow hemisphere of mass M and radius R.(Assume the base of hemisphere to be open)

Discussion

29.	Three musical instruments give out notes at the frequencies listed below: Flute: 400 Hz; Guitar: 200 Hz; Trumpet: 500 Hz The one with the highest pitch is
Answer» Three musical instruments give out notes at the frequencies listed below: Flute: 400 Hz; Guitar: 200 Hz; Trumpet: 500 Hz The one with the highest pitch is

29.

Three musical instruments give out notes at the frequencies listed below: Flute: 400 Hz; Guitar: 200 Hz; Trumpet: 500 Hz The one with the highest pitch is

Answer»

Three musical instruments give out notes at the frequencies listed below:
Flute: 400 Hz; Guitar: 200 Hz; Trumpet: 500 Hz

The one with the highest pitch is

Discussion

30.	Assertion- A red object appears dark in theyellow light. Reason:- The red colour is scattered less.
Answer» Assertion- A red object appears dark in theyellow light. Reason:- The red colour is scattered less.

Discussion

31.	Assertion:The de Broglie equation has significance for any microscopic or sub -microscopic particles. Reason:The de Broglie wavelength is inversely proportional to the mass of the object if velocity s constant.
Answer» Assertion:The de Broglie equation has significance for any microscopic or sub -microscopic particles. Reason:The de Broglie wavelength is inversely proportional to the mass of the object if velocity s constant.

Discussion

32.	When the upper tip of a magnetic dip needle is loaded with a small mass, the dip angle is found to drop from 45∘ to 30∘. If the total magnetic intensity at the place is 0.42 Oersted and the pole strength of the magnetic needle is 200 CGS units, the mass attached is x×10−3 g where x is _______.[sin15∘=0.2588;cos30∘=0.8660]
Answer» When the upper tip of a magnetic dip needle is loaded with a small mass, the dip angle is found to drop from $45^{\circ}$ to $30^{\circ}$ . If the total magnetic intensity at the place is $0.42$ Oersted and the pole strength of the magnetic needle is $200$ CGS units, the mass attached is $x \times 10^{- 3} g$ where $x$ is _______. $[sin 15^{\circ} = 0.2588; cos 30^{\circ} = 0.8660]$

Discussion

33.	Question 1 From the list given below pick the item that is not a natural resource.(a) Soil(b) Water(c) Electricity(d) Air
Answer» Question 1 From the list given below pick the item that is not a natural resource. (a) Soil (b) Water (c) Electricity (d) Air

Discussion

34.	Difference between the light ray and wave?
Answer» Difference between the light ray and wave?

Discussion

35.	What is resistance and resistivity? Why is the series arrangement not used for domestic circuits? Two resistors R1 and R2 are joined in series. Find the equivalent resistance.
Answer» What is resistance and resistivity? Why is the series arrangement not used for domestic circuits? Two resistors $R_{1}$ and $R_{2}$ are joined in series. Find the equivalent resistance.

Discussion

36.	An electric oven rated at 500w is connected to a 220v line and used for 2 hours daily. Calculate the cost of electric energy per month at the rate of Rs.5 per KWh
Answer» An electric oven rated at 500w is connected to a 220v line and used for 2 hours daily. Calculate the cost of electric energy per month at the rate of Rs.5 per KWh

Discussion

37.	If a person cannot see objects beyond 4 m clearly then what kind of corrective lenses he requires?
Answer» If a person cannot see objects beyond 4 m clearly then what kind of corrective lenses he requires?

Discussion

38.	A cell supplies a current of 2A when it is connected to a 5Ω resistance and supplies current of 1.2A, if it is connected to a resistance of 9Ω. Find the e.m.f of the cell.
Answer» A cell supplies a current of 2A when it is connected to a $5 Ω$ resistance and supplies current of 1.2A, if it is connected to a resistance of $9 Ω$ . Find the e.m.f of the cell.

Discussion

39.	(a) Distinguish between renewable and non-renewable sources of energy.(b) Choose the renewable sources of energy from the following list: Coal, biogas, sun, natural gas [3 MARKS]
Answer» (a) Distinguish between renewable and non-renewable sources of energy. (b) Choose the renewable sources of energy from the following list: Coal, biogas, sun, natural gas [3 MARKS]

Discussion

40.	Two wires of same metal have same length but area of cross section are in the ratio 3:1.They are joined in parallel .If the resistance of thin wire is 30ohm,then the total resistance of the combination will be
Answer» Two wires of same metal have same length but area of cross section are in the ratio 3:1.They are joined in parallel .If the resistance of thin wire is 30ohm,then the total resistance of the combination will be

Discussion

41.	why is sky appear as blue?
Answer» why is sky appear as blue?

Discussion

42.	Two ways by which the emf in an AC generator can be increased by
Answer» Two ways by which the emf in an AC generator can be increased by

Discussion

43.	For an electron moving in nth orbit of hydrogen atom, the angular velocity is proportional to,
Answer» For an electron moving in $n^{th}$ orbit of hydrogen atom, the angular velocity is proportional to,

Discussion

44.	Why are only solar cels used as a source of power in satellites?
Answer» Why are only solar cels used as a source of power in satellites?

Discussion

45.	31. How many mole of O2 present in 1 l of air containing 21% by vol under standard condtion
Answer» 31. How many mole of O2 present in 1 l of air containing 21% by vol under standard condtion

Discussion

46.	A parallel plate capacitor of capacitance 100microfarad is connected to a power supply of 200volt. A dielectric slab of dielectric constant 5 is now inserted into gap. Work done by supply during this process?
Answer» A parallel plate capacitor of capacitance 100microfarad is connected to a power supply of 200volt. A dielectric slab of dielectric constant 5 is now inserted into gap. Work done by supply during this process?

Discussion

47.	Fill in the following blanks with suitable words : (a) If the magnification has a plus sign, then image is ___ and ___ (b) If the magnification has a minus sign, then the image is ___ and ___.
Answer» Fill in the following blanks with suitable words : (a) If the magnification has a plus sign, then image is ___ and ___ (b) If the magnification has a minus sign, then the image is ___ and ___.

Discussion

48.	In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is:
Answer» In the experiment of Ohm's law, a potential difference of $5.0 V$ is applied across the end of a conductor of length $10.0 cm$ and diameter of $5.00 mm$ . The measured current in the conductor is $2.00 A$ . The maximum permissible percentage error in the resistivity of the conductor is:

Discussion

49.	The main component of LPG is ___.
Answer» The main component of LPG is ___.

Discussion

50.	What do you think electrical energy is?for what do you pay your electrical bill
Answer» What do you think electrical energy is?for what do you pay your electrical bill

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

what are interstitials ?

Which among the below statements is the correct statement for Ohm’s Law?

Total internal reflection

A thin girl &amp; a fat man have same KE. If the ratio of their masses is 4:25, calculate the ratio of their momentum.

Question 2List the properties of magnetic lines of force.

Consider the following two statements: (A) Linear momentum of a system of particles is zero. (B) Kinetic energy of a system of particles is zero.

The power of two lenses are +12D and -2D. They are placed incontact on the same axes. What will be the focal length of the combination?

the force of repulsion between two point charges is F , when they are d distance apart if the point charges are replaced by conducting spheres each of radius r and the charges remain same . the separation between the centre of a sphere is d , then force of repulsion between them is

Why Earth wire are long

Find DC of two lines which are connected by the relations: l-5m+3n=0 & 7l^2 +5m^2-3n^2=0

Which of the following is the condition for force multiplier?

An object is placed at a distance of 12 cm in front of a concave mirror it forms a real image 4 times larger than the object calculate the distance of the image from the mirror

Fuel formed under the earth's surface by the decomposition of organic matter is called _____.

The mean free path of an electron in a metal is 4 x 10^{-8} m. The electric field which can give on an average 2eV energy to an electron in the metal will be??

Two long and parallel straight wires A and B, carrying currents of 8.0 A and 5.0 A in the same direction, are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A

Why bulb glows immediately since drift speed of electrons is 10-4 m/s

a man carries load on his head mives distance of 5m . }W = ? when moves it over an inclined plan

Which of the following is not combustible?

The magnetic fluxes passing through a closed area kept in a magnetic field Is zero. How will you agree with this

what is grounding or earthing

A black body is at a temperature of 2880 K. Theenergy of radiation emitted by this object with wave length between 250 nm to255 nm is U1, between 500 nm to 505 nm is U2and between 1500 nm to 1505 nm is U3.Then for this situation mark the correct statement

For a given lenght L of a wire carrying current I how many cicular turns woud produce maximum magnetic moment of what value

A 10 m long potentiometer wire is connected to a battery having a steady voltage a leclanche cell is obtained at 4 m length of wire if the length is kept same but its cross section is doubled the null point will be obtained at

What is the use of inverse square law??

31.Fig. (A) and (B) show two R-L circuits. Growth of current in the two circuits is a shown in fig. (c). It can be inferred that (assume equal V in both cases) : (a)R1>R2 (b)R1L2 (d)L1

Calculate the gravitational potential at centre of the base of a hollow hemisphere of mass M and radius R.(Assume the base of hemisphere to be open)

Three musical instruments give out notes at the frequencies listed below: Flute: 400 Hz; Guitar: 200 Hz; Trumpet: 500 Hz The one with the highest pitch is

Assertion- A red object appears dark in theyellow light. Reason:- The red colour is scattered less.

Assertion:The de Broglie equation has significance for any microscopic or sub -microscopic particles. Reason:The de Broglie wavelength is inversely proportional to the mass of the object if velocity s constant.

Question 1 From the list given below pick the item that is not a natural resource.(a) Soil(b) Water(c) Electricity(d) Air

Difference between the light ray and wave?

What is resistance and resistivity? Why is the series arrangement not used for domestic circuits? Two resistors R1 and R2 are joined in series. Find the equivalent resistance.

An electric oven rated at 500w is connected to a 220v line and used for 2 hours daily. Calculate the cost of electric energy per month at the rate of Rs.5 per KWh

If a person cannot see objects beyond 4 m clearly then what kind of corrective lenses he requires?

A cell supplies a current of 2A when it is connected to a 5Ω resistance and supplies current of 1.2A, if it is connected to a resistance of 9Ω. Find the e.m.f of the cell.

(a) Distinguish between renewable and non-renewable sources of energy.(b) Choose the renewable sources of energy from the following list: Coal, biogas, sun, natural gas [3 MARKS]

Two wires of same metal have same length but area of cross section are in the ratio 3:1.They are joined in parallel .If the resistance of thin wire is 30ohm,then the total resistance of the combination will be

why is sky appear as blue?

Two ways by which the emf in an AC generator can be increased by

For an electron moving in nth orbit of hydrogen atom, the angular velocity is proportional to,

Why are only solar cels used as a source of power in satellites?

31. How many mole of O2 present in 1 l of air containing 21% by vol under standard condtion

A parallel plate capacitor of capacitance 100microfarad is connected to a power supply of 200volt. A dielectric slab of dielectric constant 5 is now inserted into gap. Work done by supply during this process?

Fill in the following blanks with suitable words : (a) If the magnification has a plus sign, then image is ___ and ___ (b) If the magnification has a minus sign, then the image is ___ and ___.

In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is:

The main component of LPG is ___.

What do you think electrical energy is?for what do you pay your electrical bill

A thin girl & a fat man have same KE. If the ratio of their masses is 4:25, calculate the ratio of their momentum.

Fill in the following blanks with suitable words : (a) If the magnification has a plus sign, then image is _ and _ (b) If the magnification has a minus sign, then the image is _ and _.