16569 + Interview Questions in Physics

1.	The strong nuclear force is:
Answer» The strong nuclear force is:

Discussion

2.	Question 7 A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the figure. Which of the following could be inside the box? (a) Concave lens (b) Rectangular glass slab (c) Prism (d) Convex lens
Answer» Question 7 A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the figure. Which of the following could be inside the box? (a) Concave lens (b) Rectangular glass slab (c) Prism (d) Convex lens

Discussion

3.	A wire 1 m long has resistance of 1ohm. If it is uniformly stretched so that it's length increases by 25percentage then it's resistances will increase by what
Answer» A wire 1 m long has resistance of 1ohm. If it is uniformly stretched so that it's length increases by 25percentage then it's resistances will increase by what

Discussion

4.	In the figure shown there are two semicircles of radii r1 and r2 in which a current I is flowing. The magnetic induction at the centre O will be:
Answer» In the figure shown there are two semicircles of radii $r_{1}$ and $r_{2}$ in which a current I is flowing. The magnetic induction at the centre O will be:

Discussion

5.	Ozone is used in
Answer» Ozone is used in

Discussion

6.	A wood frame for pouring concrete has an interior perimeter of 14 metres. Its length is one metre greater than its width. The frame is to be braced with twelve-gauge steel cross-wires. Assuming an extra half-metre of wire is used at either end of a cross-wire for anchoring, what length of wire should be cut for each brace?
Answer» A wood frame for pouring concrete has an interior perimeter of 14 metres. Its length is one metre greater than its width. The frame is to be braced with twelve-gauge steel cross-wires. Assuming an extra half-metre of wire is used at either end of a cross-wire for anchoring, what length of wire should be cut for each brace?

Discussion

7.	An electric bulb is rated 220 V and 100 W . When it is operated on 110 V , what will be the power consumed ??
Answer» An electric bulb is rated 220 V and 100 W . When it is operated on 110 V , what will be the power consumed ??

Discussion

8.	22 g of CO2 at 27∘C is mixed with 16g of O2 at 37∘C. The temperature of the mixture is
Answer» 22 g of $C O_{2}$ at $27^{\circ} C$ is mixed with 16g of $O_{2}$ at $37^{\circ} C .$ The temperature of the mixture is

Discussion

9.	A platinum sphere floats in mercury. Find the percentage change in the fraction of volume of sphere immersed in mercury when the temperature is raised by 80∘C (Volume expansivity of mercury is 182×10−6/∘C and linear expansivity of platinum is 9×10−6/∘C)
Answer» A platinum sphere floats in mercury. Find the percentage change in the fraction of volume of sphere immersed in mercury when the temperature is raised by $80^{\circ} C$ (Volume expansivity of mercury is $182 \times 10^{- 6} /^{\circ} C$ and linear expansivity of platinum is $9 \times 10^{- 6} /^{\circ} C$ )

Discussion

10.	How will you connect three resistors of 3Ω, 4Ω and 7Ω respectively so as to obtain a resultant resistance, of 3.5Ω ? [2 MARKS]
Answer» How will you connect three resistors of 3 $Ω$ , 4 $Ω$ and 7 $Ω$ respectively so as to obtain a resultant resistance, of 3.5 $Ω$ ? [2 MARKS]

Discussion

11.	Resistors R1, R2 are connected in series. If the power dissipated by them is P1,P2 then
Answer» Resistors $R_{1}, R_{2}$ are connected in series. If the power dissipated by them is $P_{1}, P_{2}$ then

Discussion

12.	“The magnification produced by a spherical mirror is-3.”List four information you obtain from this statement about the mirror/object?
Answer» “The magnification produced by a spherical mirror is-3.”List four information you obtain from this statement about the mirror/object?

Discussion

13.	Question 22 The correct electron dot structure of a water molecule is (a) (b) (c) (d)
Answer» Question 22 The correct electron dot structure of a water molecule is (a) (b) (c) (d)

Discussion

14.	The diagram in Fig. 9.27 shows a three-pin socket marked as 1, 2 and 3. (a) Identify and write live (L), neutral (N) and earth (E) against the correct number. (b) To which part of the appliance is the terminal 1 connected? (c) To which wire joined to 2 or 3, is the fuse connected and why?
Answer» The diagram in Fig. 9.27 shows a three-pin socket marked as 1, 2 and 3. (a) Identify and write live (L), neutral (N) and earth (E) against the correct number. (b) To which part of the appliance is the terminal 1 connected? (c) To which wire joined to 2 or 3, is the fuse connected and why?

14.

The diagram in Fig. 9.27 shows a three-pin socket marked as 1, 2 and 3. (a) Identify and write live (L), neutral (N) and earth (E) against the correct number. (b) To which part of the appliance is the terminal 1 connected? (c) To which wire joined to 2 or 3, is the fuse connected and why?

Answer»

The diagram in Fig. 9.27 shows a three-pin socket marked as 1, 2 and 3.

(a) Identify and write live (L), neutral (N) and earth (E) against the correct number.

(b) To which part of the appliance is the terminal 1 connected?

(c) To which wire joined to 2 or 3, is the fuse connected and why?

Discussion

15.	Find out the dimensions of the constants a and b in the Vander Waal's equation [p+av2](V−b)=RT where p is pressure, v is volume, R is gas constant and T is temperature. Column−IColumn−IIa(i)[ML5T−2]b(ii)[M2L3T−1](iii)[M0L3T0](iv)[M0L2T−1]
Answer» Find out the dimensions of the constants a and b in the Vander Waal's equation $[p + \frac{a}{v^{2}}] (V - b) = R T$ where p is pressure, v is volume, R is gas constant and T is temperature. $\begin{matrix} C o l u m n - I & C o l u m n - I I a & (i) [M L^{5} T^{- 2}] b & (i i) [M^{2} L^{3} T^{- 1}] (i i i) [M^{0} L^{3} T^{0}] (i v) [M^{0} L^{2} T^{- 1}] \end{matrix}$

15.

Find out the dimensions of the constants a and b in the Vander Waal's equation [p+av2](V−b)=RT where p is pressure, v is volume, R is gas constant and T is temperature. Column−IColumn−IIa(i)[ML5T−2]b(ii)[M2L3T−1](iii)[M0L3T0](iv)[M0L2T−1]

Answer»

Find out the dimensions of the constants a and b in the Vander Waal's equation $[p + \frac{a}{v^{2}}] (V - b) = R T$

where p is pressure, v is volume, R is gas constant and T is temperature.

$\begin{matrix} C o l u m n - I & C o l u m n - I I a & (i) [M L^{5} T^{- 2}] b & (i i) [M^{2} L^{3} T^{- 1}] (i i i) [M^{0} L^{3} T^{0}] (i v) [M^{0} L^{2} T^{- 1}] \end{matrix}$

Discussion

16.	Question 4 The figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is (a) √3√2 (b) √2√3 (c) 1√2 (d) √2
Answer» Question 4 The figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is (a) $\frac{\sqrt{3}}{\sqrt{2}}$ (b) $\frac{\sqrt{2}}{\sqrt{3}}$ (c) $\frac{1}{\sqrt{2}}$ (d) $\sqrt{2}$

Discussion

17.	A. A network of sanctuaries also exist to shelter vulnerable species. B. The crush of population makes the forest's edge a battle ground between man and animal. C. The problem is the implementation. D. Amid such adversity there is need for citizens with crusading spirit to serve as guardians of our natural heritage by supplementing or even replacing an ineffectual official forest force. E. India boasts of a corpus of stringent wildlife protection laws to conserve wildlife.
Answer» A. A network of sanctuaries also exist to shelter vulnerable species. B. The crush of population makes the forest's edge a battle ground between man and animal. C. The problem is the implementation. D. Amid such adversity there is need for citizens with crusading spirit to serve as guardians of our natural heritage by supplementing or even replacing an ineffectual official forest force. E. India boasts of a corpus of stringent wildlife protection laws to conserve wildlife.

Discussion

18.	(a) How does the resistance of a wire depend on its radius? Explain your answer. (b) Two copper wires are of same length, but one is thicker than the other. Which will have more resistance?
Answer» (a) How does the resistance of a wire depend on its radius? Explain your answer. (b) Two copper wires are of same length, but one is thicker than the other. Which will have more resistance?

Discussion

19.	A bulb is rated at 200V-100W. What is it's resistance? Five such bulbs burn for 4 hours. What is the electrical energy consumed? Calculate the cost if the rate is 4.60 ruppes per unit.
Answer» A bulb is rated at 200V-100W. What is it's resistance? Five such bulbs burn for 4 hours. What is the electrical energy consumed? Calculate the cost if the rate is 4.60 ruppes per unit.

Discussion

20.	Why is LPG considered a good fuel?
Answer» Why is LPG considered a good fuel?

Discussion

21.	What are positive and negative charge?
Answer» What are positive and negative charge?

Discussion

22.	What is the orientation of a current carrying conductor relative to the direction of magnetic field for (a) Maximum magnetic force. (b) Minimum magnetic force [2 MARKS]
Answer» What is the orientation of a current carrying conductor relative to the direction of magnetic field for (a) Maximum magnetic force. (b) Minimum magnetic force [2 MARKS]

Discussion

23.	In a single movable pulley system, a load of 225 kgf is lifted by an effort of 75 kgf. Velocity ratio of the single movable pulley is 4. Find the percentage efficiency of the system.
Answer» In a single movable pulley system, a load of 225 kgf is lifted by an effort of 75 kgf. Velocity ratio of the single movable pulley is 4. Find the percentage efficiency of the system.

Discussion

24.	An object moves from point A to point B to point C, then back to point B and then to point C along the line shown in the figure. Find the magnitude of displacement covered by the moving object in km.
Answer» An object moves from point A to point B to point C, then back to point B and then to point C along the line shown in the figure. Find the magnitude of displacement covered by the moving object in $km$ .

Discussion

25.	To move a table with a constant velocity, a force of 300 N is required. What is the friction force that will be exerted on the table?
Answer» To move a table with a constant velocity, a force of 300 N is required. What is the friction force that will be exerted on the table?

Discussion

26.	Weight of 50% pure KClO3 required to produce 33.6 litres of O2 at STP is ?
Answer» Weight of 50% pure KClO3 required to produce 33.6 litres of O2 at STP is ?

Discussion

27.	Why is there a change in the colour of the eye does it make some changes
Answer» Why is there a change in the colour of the eye does it make some changes

Discussion

28.	Images formed by plane mirror are always erect . Give reason of one to two lines.
Answer» Images formed by plane mirror are always erect . Give reason of one to two lines.

Discussion

29.	In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. The angles of incidence at the faces AB and AC are:
Answer» In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. The angles of incidence at the faces AB and AC are:

29.

In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. The angles of incidence at the faces AB and AC are:

Answer»

In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. The angles of incidence at the faces AB and AC are:

Discussion

30.	The near point of a long-sighted person is 50 cm from the eye. (a) Can she see clearly an object at : (i) a distance of 20 cm ? (ii) at infinity ? (b) To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses ?
Answer» The near point of a long-sighted person is 50 cm from the eye. (a) Can she see clearly an object at : (i) a distance of 20 cm ? (ii) at infinity ? (b) To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses ?

Discussion

31.	Why does iron filings make a random pattern when kept around the bar magnet
Answer» Why does iron filings make a random pattern when kept around the bar magnet

Discussion

32.	How is energy conserved during emf induction?
Answer» How is energy conserved during emf induction?

Discussion

33.	In a single movable pulley, if the effort moves by a distance x upwards, by what height is the load raised?
Answer» In a single movable pulley, if the effort moves by a distance x upwards, by what height is the load raised?

Discussion

34.	A projectile is projected with velocity kve in vertically upward direction from the ground into the space ve is escape velocity and (k < 1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go will be (R = radius of earth)
Answer» A projectile is projected with velocity $k v_{e}$ in vertically upward direction from the ground into the space $v_{e}$ is escape velocity and (k < 1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go will be (R = radius of earth)

Discussion

35.	Three resistors having resistances 2 Ω, 3 Ω and 4 Ω are connected so that the equivalent resistance is 9 Ω. The resistors are connected in:
Answer» Three resistors having resistances 2 $Ω$ , 3 $Ω$ and 4 $Ω$ are connected so that the equivalent resistance is 9 $Ω$ . The resistors are connected in:

Discussion

36.	If the resistance of an electric iron is 48 Ω and an electric current of 5 A is flowing through it, what will be the potential difference between two terminals of electric iron.
Answer» If the resistance of an electric iron is 48 Ω and an electric current of 5 A is flowing through it, what will be the potential difference between two terminals of electric iron.

36.

If the resistance of an electric iron is 48 Ω and an electric current of 5 A is flowing through it, what will be the potential difference between two terminals of electric iron.

Answer»

If the resistance of an electric iron is 48 Ω and an electric current of 5 A is flowing through it, what will be the

potential difference between two terminals of electric iron.

Discussion

37.	If 1020 electrons flow from black body to grey body through copper wire in 8 seconds what is the amount of current flowing the copper wire in the time interval
Answer» If 10²⁰ electrons flow from black body to grey body through copper wire in 8 seconds what is the amount of current flowing the copper wire in the time interval

Discussion

38.	The magnification of a lens is given by (v = Image distance and u = Object distance as per sign convention)
Answer» The magnification of a lens is given by (v = Image distance and u = Object distance as per sign convention)

Discussion

39.	Too much exposure to X-ray radiation may cause which of the following?
Answer» Too much exposure to X-ray radiation may cause which of the following?

Discussion

40.	A far point person suffering from myopia is 2m from the eye. Find the the focal length and power of corrective lens that will correct his vision.
Answer» A far point person suffering from myopia is 2m from the eye. Find the the focal length and power of corrective lens that will correct his vision.

Discussion

41.	Is direction of current opp. To positive charge or negative charge
Answer» Is direction of current opp. To positive charge or negative charge

Discussion

42.	Sea water does not freeze easily when compared to pure water. Why? [2 MARKS]
Answer» Sea water does not freeze easily when compared to pure water. Why? [2 MARKS]

Discussion

43.	An iron bar and a brass bar, each of length L, are soldered end to end, in series, with each other. The free ends of the combined bar are maintained at different temperatures. What is the equivalent thermal conductivity of the compound bar K', given that thermal conductivity of iron is K1 and of brass is K2 ?
Answer» An iron bar and a brass bar, each of length L, are soldered end to end, in series, with each other. The free ends of the combined bar are maintained at different temperatures. What is the equivalent thermal conductivity of the compound bar K^', given that thermal conductivity of iron is K₁ and of brass is K₂ ?

Discussion

44.	Germanium is transparent in:
Answer» Germanium is transparent in:

Discussion

45.	A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given below. The ray will be deviated by 1800: An instrument where this action of the prism is used.
Answer» A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given below. The ray will be deviated by 180⁰: An instrument where this action of the prism is used.

45.

A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given below. The ray will be deviated by 1800: An instrument where this action of the prism is used.

Answer»

A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given below. The ray will be deviated by 180⁰:

An instrument where this action of the prism is used.

Discussion

46.	How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that aμw = 43)
Answer» How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that $_{a} μ_{w}$ = $\frac{4}{3}$ )

Discussion

47.	What corrective lens should a person use who is affected by myopia and hypermetropia?
Answer» What corrective lens should a person use who is affected by myopia and hypermetropia?

Discussion

48.	A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block. The ray of light : (a) is refracted towards the normal (b) is refracted away from the normal (c) does not get refracted (d) is reflected along the same path.
Answer» A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block. The ray of light : (a) is refracted towards the normal (b) is refracted away from the normal (c) does not get refracted (d) is reflected along the same path.

Discussion

49.	The diagram alongside shows a lens as a combination of a glass slab and two prisms. (i) Name the lens formed by the combination. (ii) What is the line XX' called ? (iii) Complete the ray diagram and show the path of the incident ray AB after passing through the lens. (iv) The final emergent ray will either meet XX' at a point or appear to come from a point on XX'. Label the point as F. What is this point called ?
Answer» The diagram alongside shows a lens as a combination of a glass slab and two prisms. (i) Name the lens formed by the combination. (ii) What is the line XX' called ? (iii) Complete the ray diagram and show the path of the incident ray AB after passing through the lens. (iv) The final emergent ray will either meet XX' at a point or appear to come from a point on XX'. Label the point as F. What is this point called ?

49.

The diagram alongside shows a lens as a combination of a glass slab and two prisms. (i) Name the lens formed by the combination. (ii) What is the line XX' called ? (iii) Complete the ray diagram and show the path of the incident ray AB after passing through the lens. (iv) The final emergent ray will either meet XX' at a point or appear to come from a point on XX'. Label the point as F. What is this point called ?

Answer»

The diagram alongside shows a lens as a combination of a glass slab and two prisms.

(i) Name the lens formed by the combination.

(ii) What is the line XX' called ?

(iii) Complete the ray diagram and show the path of the incident ray AB after passing through the lens.

(iv) The final emergent ray will either meet XX' at a point or appear to come from a point on XX'. Label the point as F. What is this point called ?

Discussion

50.	Why does dispersion take place when the light is passed through a prism and not through glass slab?
Answer» Why does dispersion take place when the light is passed through a prism and not through glass slab?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The strong nuclear force is:

Question 7 A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the figure. Which of the following could be inside the box? (a) Concave lens (b) Rectangular glass slab (c) Prism (d) Convex lens

A wire 1 m long has resistance of 1ohm. If it is uniformly stretched so that it's length increases by 25percentage then it's resistances will increase by what

In the figure shown there are two semicircles of radii r1 and r2 in which a current I is flowing. The magnetic induction at the centre O will be:

Ozone is used in

An electric bulb is rated 220 V and 100 W . When it is operated on 110 V , what will be the power consumed ??

22 g of CO2 at 27∘C is mixed with 16g of O2 at 37∘C. The temperature of the mixture is

A platinum sphere floats in mercury. Find the percentage change in the fraction of volume of sphere immersed in mercury when the temperature is raised by 80∘C (Volume expansivity of mercury is 182×10−6/∘C and linear expansivity of platinum is 9×10−6/∘C)

How will you connect three resistors of 3Ω, 4Ω and 7Ω respectively so as to obtain a resultant resistance, of 3.5Ω ? [2 MARKS]

Resistors R1, R2 are connected in series. If the power dissipated by them is P1,P2 then

“The magnification produced by a spherical mirror is-3.”List four information you obtain from this statement about the mirror/object?

Question 22 The correct electron dot structure of a water molecule is (a) (b) (c) (d)

The diagram in Fig. 9.27 shows a three-pin socket marked as 1, 2 and 3. (a) Identify and write live (L), neutral (N) and earth (E) against the correct number. (b) To which part of the appliance is the terminal 1 connected? (c) To which wire joined to 2 or 3, is the fuse connected and why?

Find out the dimensions of the constants a and b in the Vander Waal's equation [p+av2](V−b)=RT where p is pressure, v is volume, R is gas constant and T is temperature. Column−IColumn−IIa(i)[ML5T−2]b(ii)[M2L3T−1](iii)[M0L3T0](iv)[M0L2T−1]

Question 4 The figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is (a) √3√2 (b) √2√3 (c) 1√2 (d) √2

(a) How does the resistance of a wire depend on its radius? Explain your answer. (b) Two copper wires are of same length, but one is thicker than the other. Which will have more resistance?

A bulb is rated at 200V-100W. What is it's resistance? Five such bulbs burn for 4 hours. What is the electrical energy consumed? Calculate the cost if the rate is 4.60 ruppes per unit.

Why is LPG considered a good fuel?

What are positive and negative charge?

What is the orientation of a current carrying conductor relative to the direction of magnetic field for (a) Maximum magnetic force. (b) Minimum magnetic force [2 MARKS]

In a single movable pulley system, a load of 225 kgf is lifted by an effort of 75 kgf. Velocity ratio of the single movable pulley is 4. Find the percentage efficiency of the system.

An object moves from point A to point B to point C, then back to point B and then to point C along the line shown in the figure. Find the magnitude of displacement covered by the moving object in km.

To move a table with a constant velocity, a force of 300 N is required. What is the friction force that will be exerted on the table?

Weight of 50% pure KClO3 required to produce 33.6 litres of O2 at STP is ?

Why is there a change in the colour of the eye does it make some changes

Images formed by plane mirror are always erect . Give reason of one to two lines.

In the given figure, a ray of light PQ is incident normally on one face AB of an equilateral glass prism. The angles of incidence at the faces AB and AC are:

The near point of a long-sighted person is 50 cm from the eye. (a) Can she see clearly an object at : (i) a distance of 20 cm ? (ii) at infinity ? (b) To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses ?

Why does iron filings make a random pattern when kept around the bar magnet

How is energy conserved during emf induction?

In a single movable pulley, if the effort moves by a distance x upwards, by what height is the load raised?

A projectile is projected with velocity kve in vertically upward direction from the ground into the space ve is escape velocity and (k &lt; 1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go will be (R = radius of earth)

Three resistors having resistances 2 Ω, 3 Ω and 4 Ω are connected so that the equivalent resistance is 9 Ω. The resistors are connected in:

If the resistance of an electric iron is 48 Ω and an electric current of 5 A is flowing through it, what will be the potential difference between two terminals of electric iron.

If 1020 electrons flow from black body to grey body through copper wire in 8 seconds what is the amount of current flowing the copper wire in the time interval

The magnification of a lens is given by (v = Image distance and u = Object distance as per sign convention)

Too much exposure to X-ray radiation may cause which of the following?

A far point person suffering from myopia is 2m from the eye. Find the the focal length and power of corrective lens that will correct his vision.

Is direction of current opp. To positive charge or negative charge

Sea water does not freeze easily when compared to pure water. Why? [2 MARKS]

Germanium is transparent in:

A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given below. The ray will be deviated by 1800: An instrument where this action of the prism is used.

How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that aμw = 43)

What corrective lens should a person use who is affected by myopia and hypermetropia?

A ray of light travelling in water falls at right angles to the boundary of a parallel-sided glass block. The ray of light : (a) is refracted towards the normal (b) is refracted away from the normal (c) does not get refracted (d) is reflected along the same path.

Why does dispersion take place when the light is passed through a prism and not through glass slab?

A projectile is projected with velocity kve in vertically upward direction from the ground into the space ve is escape velocity and (k < 1). If air resistance is considered to be negligible then the maximum height from the centre of earth to which it can go will be (R = radius of earth)