16569 + Interview Questions in Physics

1.	Statement 1: Angle of incidence is always equal to the angle of reflection. Statement 2: Angle of incidence is always twice the angle of reflection. Statement 3: The incident ray, reflected ray and the normal all lie in 3 different planes. Statement 4: The incidence ray, reflected ray and the normal all lie in the same plane. Which of the statements refer to the laws of reflection?
Answer» Statement 1: Angle of incidence is always equal to the angle of reflection. Statement 2: Angle of incidence is always twice the angle of reflection. Statement 3: The incident ray, reflected ray and the normal all lie in 3 different planes. Statement 4: The incidence ray, reflected ray and the normal all lie in the same plane. Which of the statements refer to the laws of reflection?

1.

Statement 1: Angle of incidence is always equal to the angle of reflection. Statement 2: Angle of incidence is always twice the angle of reflection. Statement 3: The incident ray, reflected ray and the normal all lie in 3 different planes. Statement 4: The incidence ray, reflected ray and the normal all lie in the same plane. Which of the statements refer to the laws of reflection?

Answer»

Statement 1: Angle of incidence is always equal to the angle of reflection.

Statement 2: Angle of incidence is always twice the angle of reflection.

Statement 3: The incident ray, reflected ray and the normal all lie in 3 different planes.

Statement 4: The incidence ray, reflected ray and the normal all lie in the same plane.

Which of the statements refer to the laws of reflection?

Discussion

2.	If a red light ray falls on the following system of prisms. Then after the dispersion, how many colours do we see in the emergent ray?
Answer» If a red light ray falls on the following system of prisms. Then after the dispersion, how many colours do we see in the emergent ray?

2.

If a red light ray falls on the following system of prisms. Then after the dispersion, how many colours do we see in the emergent ray?

Answer»

If a red light ray falls on the following system of prisms. Then after the dispersion, how many colours do we see in the emergent ray?

Discussion

3.	For very small angle of incidence (i≈3∘) of a ray of light striking a glass slab as shown in figure.The correct plot for lateral displacement (d) of ray vs angle of incidence (i) will be:
Answer» For very small angle of incidence $(i \approx 3^{\circ})$ of a ray of light striking a glass slab as shown in figure. The correct plot for lateral displacement (d) of ray vs angle of incidence (i) will be:

Discussion

4.	Why a SOLENOID-: (a) is made up of long INSULATED wire (b) made by winding wire over a NONCONDUCTING CYLINDRICAL TUBE
Answer» Why a SOLENOID-: (a) is made up of long INSULATED wire (b) made by winding wire over a NONCONDUCTING CYLINDRICAL TUBE

Discussion

5.	(i) Name the mirrors shown in figure (a) and (b). (ii) In each case (a) and (b), draw the reflected rays for the given incident rays and mark focus by the symbol F.
Answer» (i) Name the mirrors shown in figure (a) and (b). (ii) In each case (a) and (b), draw the reflected rays for the given incident rays and mark focus by the symbol F.

5.

(i) Name the mirrors shown in figure (a) and (b). (ii) In each case (a) and (b), draw the reflected rays for the given incident rays and mark focus by the symbol F.

Answer»

(i) Name the mirrors shown in figure (a) and (b).

(ii) In each case (a) and (b), draw the reflected rays for the given incident rays and mark focus by the symbol F.

Discussion

6.	Statement I- The voltage across a resistance is directly proportional to the current flowing in it. Statement II- Ohm’s law
Answer» Statement I- The voltage across a resistance is directly proportional to the current flowing in it. Statement II- Ohm’s law

6.

Statement I- The voltage across a resistance is directly proportional to the current flowing in it. Statement II- Ohm’s law

Answer»

Statement I- The voltage across a resistance is directly proportional to the current flowing in it.

Statement II- Ohm’s law

Discussion

7.	Let In=∫sinnx dx and Jm=∫cosmx dx. If I4+J4=Ax+Bsin4x+C, then AB is equal to(where C is integration constant)
Answer» Let $I_{n} = \int {sin}^{n} x d x$ and $J_{m} = \int {cos}^{m} x d x .$ If $I_{4} + J_{4} = A x + B sin 4 x + C,$ then $\frac{A}{B}$ is equal to (where $C$ is integration constant)

Discussion

8.	16 For a certain organ pipe three successive resonance frequencies are observed at 425, 595 ,and 765,Hz respectively, taking the speed of the sound in the air to be 340 m /s the fundamental frequency of the pipe in Hz is
Answer» 16 For a certain organ pipe three successive resonance frequencies are observed at 425, 595 ,and 765,Hz respectively, taking the speed of the sound in the air to be 340 m /s the fundamental frequency of the pipe in Hz is

Discussion

9.	A parallel beam of light travelling in water (refractive index=43) is refracted by a spherical air bubble of radius 2 mm situated in water. Assuming the light rays to be paraxial. Find the distance (in mm) between position of the image due to refraction at the first surface and the position of the final image
Answer» A parallel beam of light travelling in water (refractive index $= \frac{4}{3}$ ) is refracted by a spherical air bubble of radius $2 mm$ situated in water. Assuming the light rays to be paraxial. Find the distance ( $in mm$ ) between position of the image due to refraction at the first surface and the position of the final image

Discussion

10.	A uniform meter ruler of weight 0.1 kgf is balanced on a fulcrum at 40 cm mark by suspending a weight, w at the 20 cm mark . What is the value of w?
Answer» A uniform meter ruler of weight $0.1 k g f$ is balanced on a fulcrum at $40 c m$ mark by suspending a weight, $w$ at the $20 c m$ mark . What is the value of $w$ ?

Discussion

11.	If three concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principal axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?
Answer» If three concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principal axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?

11.

If three concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principal axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?

Answer»

If three concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principal axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?

Discussion

12.	Question 2Rutherford's alpha(a) particles scattering experiment resulted in the discovery of(a) Electron(b) Proton(c) Nucleus in the atom(d) Atomic mass
Answer» Question 2 Rutherford's alpha(a) particles scattering experiment resulted in the discovery of (a) Electron (b) Proton (c) Nucleus in the atom (d) Atomic mass

Discussion

13.	Why is the sky blue ?
Answer» Why is the sky blue ?

Discussion

14.	87.A telescope has an angular magnification of magnitude 6 for distant objects . The separation between the objective and the eyepiece is 49cm. The final image is formed at infinity. The focal length of the objective lens is
Answer» 87.A telescope has an angular magnification of magnitude 6 for distant objects . The separation between the objective and the eyepiece is 49cm. The final image is formed at infinity. The focal length of the objective lens is

Discussion

15.	Is there white holes ? if yes what are the characteristics ?
Answer» Is there white holes ? if yes what are the characteristics ?

Discussion

16.	A piece of wire having equal resistance R is cut into 4 equal parts 1) compare resistance of each part with resistance of original wire 2) if 4 parts are connected in parallel, compare equivalent resistance with resistance of original wire.
Answer» A piece of wire having equal resistance R is cut into 4 equal parts 1) compare resistance of each part with resistance of original wire 2) if 4 parts are connected in parallel, compare equivalent resistance with resistance of original wire.

Discussion

17.	Which of the following is not a traditional age-old water harvesting system used in India?
Answer» Which of the following is not a traditional age-old water harvesting system used in India?

Discussion

18.	Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. what would happed if : (i) a current is passed through coil B by plugging the key ? (ii) the current is stopped by removing the plug from the key ? Explain your answer mentioning the name of the phenomenon involved.
Answer» Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. what would happed if : (i) a current is passed through coil B by plugging the key ? (ii) the current is stopped by removing the plug from the key ? Explain your answer mentioning the name of the phenomenon involved.

18.

Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. what would happed if : (i) a current is passed through coil B by plugging the key ? (ii) the current is stopped by removing the plug from the key ? Explain your answer mentioning the name of the phenomenon involved.

Answer»

Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. what would happed if :

(i) a current is passed through coil B by plugging the key ?

(ii) the current is stopped by removing the plug from the key ?

Explain your answer mentioning the name of the phenomenon involved.

Discussion

19.	Law of conservation of momentum proved
Answer» Law of conservation of momentum proved

Discussion

20.	How to prove that the value of g is 9.8m/s²
Answer» How to prove that the value of g is 9.8m/s²

Discussion

21.	Which of the following conditions regarding a chemical process ensures its spontaneity at all temperature?
Answer» Which of the following conditions regarding a chemical process ensures its spontaneity at all temperature?

Discussion

22.	A light bulb 14 W emits white light, which is a mixture of various colours in the spectrum. The energy is distributed among the seven colours i.e., red, orange, yellow, green, purple, indigo and blue. If the number of photons n emitted from each colour is equal, then the frequency of green colour is (The frequency of all the colours of white light are in AP)(ntime)=5.5×1018 s−1
Answer» A light bulb $14 W$ emits white light, which is a mixture of various colours in the spectrum. The energy is distributed among the seven colours i.e., red, orange, yellow, green, purple, indigo and blue. If the number of photons $n$ emitted from each colour is equal, then the frequency of green colour is (The frequency of all the colours of white light are in AP) $(\frac{n}{time}) = 5.5 \times 10^{18} s^{- 1}$

Discussion

23.	How much will the resistance change if the diameter of the wire is doubled and its length is halved?
Answer» How much will the resistance change if the diameter of the wire is doubled and its length is halved?

Discussion

24.	An object is placed 6 cm in front of a concave mirror. A real image of the same size as the object is obtained. Find out the focal length of the mirror.
Answer» An object is placed $6 cm$ in front of a concave mirror. A real image of the same size as the object is obtained. Find out the focal length of the mirror.

Discussion

25.	State any three points about the Apollo missions.
Answer» State any three points about the Apollo missions.

Discussion

26.	a seies rc circuit with R = 200kΩ and capacitor 10μ F is connected to a battery of 5.0 V battery until the capacitor is fully charged. Then the battery is replaced with another battery of oppsite polarity. Consequent upon this replacement, the voltage across the capacitor will be zero in how much time?
Answer» a seies rc circuit with R = 200kΩ and capacitor 10μ F is connected to a battery of 5.0 V battery until the capacitor is fully charged. Then the battery is replaced with another battery of oppsite polarity. Consequent upon this replacement, the voltage across the capacitor will be zero in how much time?

Discussion

27.	Three resistances of 1, 2 and 3 are connected in parallel as shown in Figurebelow. If the main current is 2.2A find(a) the potential difference between P and Q(b) the current in each of the resistances. [3 MARKS]
Answer» Three resistances of 1, 2 and 3 are connected in parallel as shown in Figure below. If the main current is 2.2A find (a) the potential difference between P and Q (b) the current in each of the resistances. [3 MARKS]

27.

Three resistances of 1, 2 and 3 are connected in parallel as shown in Figurebelow. If the main current is 2.2A find(a) the potential difference between P and Q(b) the current in each of the resistances. [3 MARKS]

Answer»

Three resistances of 1, 2 and 3 are connected in parallel as shown in Figure

below. If the main current is 2.2A find

(a) the potential difference between P and Q

(b) the current in each of the resistances. [3 MARKS]

Discussion

28.	the lowest resis†an ce which can be obtained by connecting 10 resistors each of 1÷10 ohm is
Answer» the lowest resis†an ce which can be obtained by connecting 10 resistors each of 1÷10 ohm is

Discussion

29.	At what height `h' from the earth surface, acceleration due to gravity becomes half as that of acceleration due to gravity on the surface of earth.[R = Radius of earth]
Answer» At what height `h' from the earth surface, acceleration due to gravity becomes half as that of acceleration due to gravity on the surface of earth. [R = Radius of earth]

Discussion

30.	In order to obtain a magnification of, - 0.6 (minus 0.6) with a concave mirror, the object must be placed : (a) at the focus (b) between pole and focus (c) between focus and centre of curvature (d) beyond the centre of curvature
Answer» In order to obtain a magnification of, - 0.6 (minus 0.6) with a concave mirror, the object must be placed : (a) at the focus (b) between pole and focus (c) between focus and centre of curvature (d) beyond the centre of curvature

Discussion

31.	An electric bulb is rated 220 V and 100 W. When it is operated at 110 V, the power consumed will be:
Answer» An electric bulb is rated $220 V$ and $100 W .$ When it is operated at $110 V,$ the power consumed will be:

Discussion

32.	Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect (upright) image of linear magnification 4.
Answer» Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect (upright) image of linear magnification 4.

Discussion

33.	The equivalent resistance of the following circuit diagram is 4 Ω. Calculate the value of x.
Answer» The equivalent resistance of the following circuit diagram is 4 Ω. Calculate the value of x.

33.

The equivalent resistance of the following circuit diagram is 4 Ω. Calculate the value of x.

Answer»

The equivalent resistance of the following circuit diagram is 4 Ω. Calculate the value of x.

Discussion

34.	A rod of length 1.5 m is rotating about O over a frictionless conducting ring in a magnetic field B=0.4 T, with constant angular velocity ω=10 rad/s as shown in the figure. Then the current flowing through the rod OA is:
Answer» A rod of length $1.5 m$ is rotating about $O$ over a frictionless conducting ring in a magnetic field $B = 0.4 T,$ with constant angular velocity $ω = 10 rad/s$ as shown in the figure. Then the current flowing through the rod $OA$ is:

Discussion

35.	Which of the two is a cleaner fuel : hydrogen or CNG ? Why ?
Answer» Which of the two is a cleaner fuel : hydrogen or CNG ? Why ?

Discussion

36.	What is spilliting method ?
Answer» What is spilliting method ?

Discussion

37.	The "amount of electricity" as observed by Henry Cavendish is the quantity that we refer to today as:
Answer» The "amount of electricity" as observed by Henry Cavendish is the quantity that we refer to today as:

Discussion

38.	What is known as sum and product method .
Answer» What is known as sum and product method .

Discussion

39.	With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. Calculate the refractive index of the flint glass with respect to alcohol.1.21
Answer» With respect to air, the refractive index of a flint glass and alcohol is $1.65$ and $1.36$ respectively. Calculate the refractive index of the flint glass with respect to alcohol. 1.21

Discussion

40.	How is it so that a bulb flows as soon as it is switched on, though the electrons drift at a speed of 1 or 2 cm/s?
Answer» How is it so that a bulb flows as soon as it is switched on, though the electrons drift at a speed of 1 or 2 cm/s?

Discussion

41.	A fish inside a river will appear at a/an _________ depth to an observer looking from the ground.
Answer» A fish inside a river will appear at a/an _________ depth to an observer looking from the ground.

Discussion

42.	For the circuit shown, the total resistance between A & B is
Answer» For the circuit shown, the total resistance between $A$ & $B$ is

Discussion

43.	The human eye can focus objects at the different distance by adjusting the focal length of the eye lens. This is due to
Answer» The human eye can focus objects at the different distance by adjusting the focal length of the eye lens. This is due to

Discussion

44.	When a wire is carrying current, the magnetic field around the conductor can be found by ___ hand thumb rule.
Answer» When a wire is carrying current, the magnetic field around the conductor can be found by ___ hand thumb rule.

Discussion

45.	Angle of a prism is 30∘ and its refractive index is √2and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path
Answer» Angle of a prism is $30^{\circ}$ and its refractive index is $\sqrt{2}$ and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path

Discussion

46.	Pick the incorrect statement about solar cells/panel.
Answer» Pick the incorrect statement about solar cells/panel.

Discussion

47.	What is refraction?
Answer» What is refraction?

Discussion

48.	Find out the angle of refraction when a light travels from medium A to medium B.Speed of light in A =2×108 m/sSpeed of light in B =3×108 m/s
Answer» Find out the angle of refraction when a light travels from medium A to medium B. Speed of light in A $= 2 \times 10^{8} m / s$ Speed of light in B $= 3 \times 10^{8} m / s$

48.

Find out the angle of refraction when a light travels from medium A to medium B.Speed of light in A =2×108 m/sSpeed of light in B =3×108 m/s

Answer»

Find out the angle of refraction when a light travels from medium A to medium B.

Speed of light in A $= 2 \times 10^{8} m / s$

Speed of light in B $= 3 \times 10^{8} m / s$

Discussion

49.	Mention some of the important terms associated with the spherical mirrors.
Answer» Mention some of the important terms associated with the spherical mirrors.

Discussion

50.	3. There is a uniform electric field of intensity E which is as shown. How many labelled points have the same electric potential as the fully shaded point ?
Answer» 3. There is a uniform electric field of intensity E which is as shown. How many labelled points have the same electric potential as the fully shaded point ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If a red light ray falls on the following system of prisms. Then after the dispersion, how many colours do we see in the emergent ray?

For very small angle of incidence (i≈3∘) of a ray of light striking a glass slab as shown in figure.The correct plot for lateral displacement (d) of ray vs angle of incidence (i) will be:

Why a SOLENOID-: (a) is made up of long INSULATED wire (b) made by winding wire over a NONCONDUCTING CYLINDRICAL TUBE

(i) Name the mirrors shown in figure (a) and (b). (ii) In each case (a) and (b), draw the reflected rays for the given incident rays and mark focus by the symbol F.

Statement I- The voltage across a resistance is directly proportional to the current flowing in it. Statement II- Ohm’s law

Let In=∫sinnx dx and Jm=∫cosmx dx. If I4+J4=Ax+Bsin4x+C, then AB is equal to(where C is integration constant)

16 For a certain organ pipe three successive resonance frequencies are observed at 425, 595 ,and 765,Hz respectively, taking the speed of the sound in the air to be 340 m /s the fundamental frequency of the pipe in Hz is

A uniform meter ruler of weight 0.1 kgf is balanced on a fulcrum at 40 cm mark by suspending a weight, w at the 20 cm mark . What is the value of w?

If three concave mirrors are cut from a sphere and put in the given set up and if the sun lies on the principal axis of mirror 2 at infinity, then at what position will the images of the sun be formed by three mirrors?

Question 2Rutherford's alpha(a) particles scattering experiment resulted in the discovery of(a) Electron(b) Proton(c) Nucleus in the atom(d) Atomic mass

Why is the sky blue ?

87.A telescope has an angular magnification of magnitude 6 for distant objects . The separation between the objective and the eyepiece is 49cm. The final image is formed at infinity. The focal length of the objective lens is

Is there white holes ? if yes what are the characteristics ?

A piece of wire having equal resistance R is cut into 4 equal parts 1) compare resistance of each part with resistance of original wire 2) if 4 parts are connected in parallel, compare equivalent resistance with resistance of original wire.

Which of the following is not a traditional age-old water harvesting system used in India?

Law of conservation of momentum proved

How to prove that the value of g is 9.8m/s²

Which of the following conditions regarding a chemical process ensures its spontaneity at all temperature?

How much will the resistance change if the diameter of the wire is doubled and its length is halved?

An object is placed 6 cm in front of a concave mirror. A real image of the same size as the object is obtained. Find out the focal length of the mirror.

State any three points about the Apollo missions.

Three resistances of 1, 2 and 3 are connected in parallel as shown in Figurebelow. If the main current is 2.2A find(a) the potential difference between P and Q(b) the current in each of the resistances. [3 MARKS]

the lowest resis†an ce which can be obtained by connecting 10 resistors each of 1÷10 ohm is

At what height `h' from the earth surface, acceleration due to gravity becomes half as that of acceleration due to gravity on the surface of earth.[R = Radius of earth]

In order to obtain a magnification of, - 0.6 (minus 0.6) with a concave mirror, the object must be placed : (a) at the focus (b) between pole and focus (c) between focus and centre of curvature (d) beyond the centre of curvature

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

Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect (upright) image of linear magnification 4.

The equivalent resistance of the following circuit diagram is 4 Ω. Calculate the value of x.

A rod of length 1.5 m is rotating about O over a frictionless conducting ring in a magnetic field B=0.4 T, with constant angular velocity ω=10 rad/s as shown in the figure. Then the current flowing through the rod OA is:

Which of the two is a cleaner fuel : hydrogen or CNG ? Why ?

What is spilliting method ?

The "amount of electricity" as observed by Henry Cavendish is the quantity that we refer to today as:

What is known as sum and product method .

With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. Calculate the refractive index of the flint glass with respect to alcohol.1.21

How is it so that a bulb flows as soon as it is switched on, though the electrons drift at a speed of 1 or 2 cm/s?

A fish inside a river will appear at a/an _________ depth to an observer looking from the ground.

For the circuit shown, the total resistance between A &amp; B is

The human eye can focus objects at the different distance by adjusting the focal length of the eye lens. This is due to

When a wire is carrying current, the magnetic field around the conductor can be found by ___ hand thumb rule.

Angle of a prism is 30∘ and its refractive index is √2and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path

Pick the incorrect statement about solar cells/panel.

What is refraction?

Find out the angle of refraction when a light travels from medium A to medium B.Speed of light in A =2×108 m/sSpeed of light in B =3×108 m/s

Mention some of the important terms associated with the spherical mirrors.

3. There is a uniform electric field of intensity E which is as shown. How many labelled points have the same electric potential as the fully shaded point ?

For the circuit shown, the total resistance between A & B is