16569 + Interview Questions in Physics

1.	A compass needle of magnetic moment 60 Am2, pointing towards geographical north at a certain place where the horizontal component of earth's magnetic field is 40μwb m2 experiences a torque of 1.2×10−3 N-m . The declination at that place _____ (in degree) (Give integer value).
Answer» A compass needle of magnetic moment $60 {Am}^{2}$ , pointing towards geographical north at a certain place where the horizontal component of earth's magnetic field is $40 μ {wb m}^{2}$ experiences a torque of $1.2 \times 10^{- 3} N-m$ . The declination at that place _____ (in degree) (Give integer value).

Discussion

2.	a resistance R draws power P when connected to an AC source,if an inductance is now placed in series with R ,such that impedance becomes Z, the power drawn will be
Answer» a resistance R draws power P when connected to an AC source,if an inductance is now placed in series with R ,such that impedance becomes Z, the power drawn will be

Discussion

3.	Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?
Answer» Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?

Discussion

4.	A bearm of white light is shone onto a glass prism. The light cannot be : (a) deviated (b) dispersed (c) focused (d) refracted
Answer» A bearm of white light is shone onto a glass prism. The light cannot be : (a) deviated (b) dispersed (c) focused (d) refracted

Discussion

5.	Velocity and acc. of a charged particle moving in a magnetic field at some ins†an t are v=3i+4j and a=2i+xj then a.x=-1.5b.magnetic field along z axis c. kinetic energy cons†an t d. 3 options correct
Answer» Velocity and acc. of a charged particle moving in a magnetic field at some ins†an t are v=3i+4j and a=2i+xj then a.x=-1.5b.magnetic field along z axis c. kinetic energy cons†an t d. 3 options correct

Discussion

6.	With the help of a ray diagram, state what is meant by refraction of light. State Snell's law for refraction oflight and also express it mathematically. The refractive index of air with respect to glass is 2/3 and the refractive index of water with respect to air is 4/3. If the speed of light in glass is 2x 10^{}m/s, find the speed of light in (a) air, (b) water.
Answer» With the help of a ray diagram, state what is meant by refraction of light. State Snell's law for refraction oflight and also express it mathematically. The refractive index of air with respect to glass is 2/3 and the refractive index of water with respect to air is 4/3. If the speed of light in glass is 2x 10^{}m/s, find the speed of light in (a) air, (b) water.

Discussion

7.	97.5 KJ mol2) The energy of activation for a first orderreaction is 104 kJ mol The rate constant at 25^° Cis 3.7 x105 s1 What is the rate constant at 30^° c?(7.4 x10 s)-1
Answer» 97.5 KJ mol2) The energy of activation for a first orderreaction is 104 kJ mol The rate constant at 25^° Cis 3.7 x105 s1 What is the rate constant at 30^° c?(7.4 x10 s)-1

Discussion

8.	28 A dilute aqueous solutions of sodium fluoride is electrolysed; the product at the anode and cathode are
Answer» 28 A dilute aqueous solutions of sodium fluoride is electrolysed; the product at the anode and cathode are

Discussion

9.	Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum
Answer» Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum

Discussion

10.	A double convex lens has two surface of equal radii R and refractive index 1.5 ,then focal length i
Answer» A double convex lens has two surface of equal radii R and refractive index 1.5 ,then focal length i

Discussion

11.	A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is
Answer» A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is

Discussion

12.	A squre plate of side length a2 is removed from a uniform square plate of mass M and side length a as shown. Moment of inerti of remaining plate about an aixs which is passing thorugh centre O and perpendicular to plane of this plate, will beDiagram
Answer» A squre plate of side length $\frac{a}{2}$ is removed from a uniform square plate of mass $M$ and side length $a$ as shown. Moment of inerti of remaining plate about an aixs which is passing thorugh centre $O$ and perpendicular to plane of this plate, will be Diagram

Discussion

13.	Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.
Answer» Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.

Discussion

14.	A long ssolenoid of self induc†an ce L,not carrying any current is placed in a uniform magnetic field with its axis parallel to the direction of the field .The total magnetic flux linked with the solenoid is ϕ.Find the energy of the magnetic field contained inside the solenoid
Answer» A long ssolenoid of self induc†an ce L,not carrying any current is placed in a uniform magnetic field with its axis parallel to the direction of the field .The total magnetic flux linked with the solenoid is ϕ.Find the energy of the magnetic field contained inside the solenoid

Discussion

15.	How does the concave mirror used in satellite dishes strengthen weak signals?
Answer» How does the concave mirror used in satellite dishes strengthen weak signals?

Discussion

16.	An observer 1.5 m tall is 28.5 m away from a tower. The angle of elevation of the top of the tower from her eyes is 45∘. What is the height of the tower? [2 MARKS]
Answer» An observer 1.5 m tall is 28.5 m away from a tower. The angle of elevation of the top of the tower from her eyes is $45^{\circ}$ . What is the height of the tower? [2 MARKS]

Discussion

17.	List down the drawbacks of a coal thermal power plant.
Answer» List down the drawbacks of a coal thermal power plant.

Discussion

18.	A conducting sphere of radius r is surrounded by a poorly conducting material of inner radius a and outer radius b whose resistivity ρ varies withρ=ρ_or^3. find the resis†an ce between the sphere and the outer surface of surrounding conducting mater
Answer» A conducting sphere of radius r is surrounded by a poorly conducting material of inner radius a and outer radius b whose resistivity ρ varies withρ=ρ_or^3. find the resis†an ce between the sphere and the outer surface of surrounding conducting mater

Discussion

19.	No refraction occurs when the light ray incident is ___ a boundary of two medium.
Answer» No refraction occurs when the light ray incident is ___ a boundary of two medium.

Discussion

20.	How many moles of sulphur atoms ad oxygen atoms are present in one mole each of H2SO4, H2O3 and SO2?
Answer» How many moles of sulphur atoms ad oxygen atoms are present in one mole each of H2SO4, H2O3 and SO2?

Discussion

21.	Ashwin pulls a load up an inclined plane. What forces must Ashwin overcome to pull it up? A. Contact force B. Gravitational force C. Frictional force
Answer» Ashwin pulls a load up an inclined plane. What forces must Ashwin overcome to pull it up? A. Contact force B. Gravitational force C. Frictional force

Discussion

22.	8. An equiconvex lens of ref. Index = 1.5 of focal length 10 cm is silvered on one side. It will behave like a _______ mirror of focal length __ cm. Fill in the blanks
Answer» 8. An equiconvex lens of ref. Index = 1.5 of focal length 10 cm is silvered on one side. It will behave like a _______ mirror of focal length __ cm. Fill in the blanks

Discussion

23.	124.One face of a rectangular glass plate 6cm thick is silvered. An object held 8cm in front of the first face, forms an image 12cm behind the silvered face. The refractive index of the glass is: 1) 1.2 2) 1.6 3) 1.5 4) 1.3
Answer» 124.One face of a rectangular glass plate 6cm thick is silvered. An object held 8cm in front of the first face, forms an image 12cm behind the silvered face. The refractive index of the glass is: 1) 1.2 2) 1.6 3) 1.5 4) 1.3

Discussion

24.	sodium is more electropositive than aluminium but still why is aluminium a better conductor than sodiu
Answer» sodium is more electropositive than aluminium but still why is aluminium a better conductor than sodiu

Discussion

25.	Name a substance of which the specific resistance remains almost unchanged by the increase in temperature.
Answer» Name a substance of which the specific resistance remains almost unchanged by the increase in temperature.

Discussion

26.	Is there any meaning of weight of the earth?
Answer» Is there any meaning of weight of the earth?

Discussion

27.	Arun has 2 bags of sugar, bag 1 has 13 kg of sugar and bag 2 has 13500 grams of sugar. Which of the following statement is correct?
Answer» Arun has 2 bags of sugar, bag 1 has 13 kg of sugar and bag 2 has 13500 grams of sugar. Which of the following statement is correct?

27.

Arun has 2 bags of sugar, bag 1 has 13 kg of sugar and bag 2 has 13500 grams of sugar. Which of the following statement is correct?

Answer»

Arun has 2 bags of sugar, bag 1 has 13 kg of sugar and bag 2 has 13500 grams of sugar.

Which of the following statement is correct?

Discussion

28.	The average distance between the Sun and Jupiter is 5.2 AU. This distance can also be written as
Answer» The average distance between the Sun and Jupiter is 5.2 AU. This distance can also be written as

Discussion

29.	What are equivalent conductivity if they are connected in series and when connected in parallel Of two subs†an ces have conductivity σ1 and σ2 also find the equivalent resistivity if they are connected in series and when connected in parallel Of two subs†an ces have resistivity ρ1 and ρ2 .
Answer» What are equivalent conductivity if they are connected in series and when connected in parallel Of two subs†an ces have conductivity σ1 and σ2 also find the equivalent resistivity if they are connected in series and when connected in parallel Of two subs†an ces have resistivity ρ1 and ρ2 .

Discussion

30.	In the circuit shown in figure, for what value of R will the power consumed by this resistance will be maximum.
Answer» In the circuit shown in figure, for what value of $R$ will the power consumed by this resistance will be maximum.

Discussion

31.	Suppose you are on a roller coaster ride that is undergoing free fall. If you release a ball, from your perspective what can you say about the motion of the ball?
Answer» Suppose you are on a roller coaster ride that is undergoing free fall. If you release a ball, from your perspective what can you say about the motion of the ball?

Discussion

32.	Which of the following is an axial vector?
Answer» Which of the following is an axial vector?

Discussion

33.	A uniform magnetic field and a uniform electric field are produced pointed in the same direction. an electron is projected with its velocity in the same direction (A) the electron will turn to its right (B) the electron will turn to its left (c) the electron's velocity will increase in magnitude D) the electrons velocity will decrease in magnitude Ans given is option D
Answer» A uniform magnetic field and a uniform electric field are produced pointed in the same direction. an electron is projected with its velocity in the same direction (A) the electron will turn to its right (B) the electron will turn to its left (c) the electron's velocity will increase in magnitude D) the electrons velocity will decrease in magnitude Ans given is option D

33.

A uniform magnetic field and a uniform electric field are produced pointed in the same direction. an electron is projected with its velocity in the same direction (A) the electron will turn to its right (B) the electron will turn to its left (c) the electron's velocity will increase in magnitude D) the electrons velocity will decrease in magnitude Ans given is option D

Answer»

A uniform magnetic field and a uniform electric field are produced pointed in the same direction. an electron is projected with its velocity in the same direction

(A) the electron will turn to its right

(B) the electron will turn to its left

(c) the electron's velocity will increase in magnitude

D) the electrons velocity will decrease in magnitude

Ans given is option D

Discussion

34.	0.5Ω In the circuit shown, the current in the 1Ω resistor is7.\lbrack JEE (Main 206V2Ω 1Ω 9V3Ω (a) 1.3 A, from P to Q(c) 0.13A irom Q to P(b) 0A(d) 0.13 A, frQom P to8. The roadi
Answer» 0.5Ω In the circuit shown, the current in the 1Ω resistor is7.\lbrack JEE (Main 206V2Ω 1Ω 9V3Ω (a) 1.3 A, from P to Q(c) 0.13A irom Q to P(b) 0A(d) 0.13 A, frQom P to8. The roadi

Discussion

35.	Explain the shining of an air bubble in water.
Answer» Explain the shining of an air bubble in water.

Discussion

36.	In fig below shows the use of a lever. (a) State the principle of moments as applied to the above lever. (b) To which class of lever does it belong? Give an example of this class of lever. (c) If FA = 10 cm , AB= 490 cm, calculate : (i) the mechanical advantage, and (ii) the minimum effort required to lift the load (= 50 N).
Answer» In fig below shows the use of a lever. (a) State the principle of moments as applied to the above lever. (b) To which class of lever does it belong? Give an example of this class of lever. (c) If FA = 10 cm , AB= 490 cm, calculate : (i) the mechanical advantage, and (ii) the minimum effort required to lift the load (= 50 N).

36.

In fig below shows the use of a lever. (a) State the principle of moments as applied to the above lever. (b) To which class of lever does it belong? Give an example of this class of lever. (c) If FA = 10 cm , AB= 490 cm, calculate : (i) the mechanical advantage, and (ii) the minimum effort required to lift the load (= 50 N).

Answer»

In fig below shows the use of a lever.

(a) State the principle of moments as applied to the above lever.

(b) To which class of lever does it belong? Give an example of this class of lever.

(c) If FA = 10 cm , AB= 490 cm, calculate : (i) the mechanical advantage, and (ii) the minimum effort required to lift the load (= 50 N).

Discussion

37.	An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?
Answer» An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?

Discussion

38.	Which of the following reactions occur during explosion of an atom bomb?
Answer» Which of the following reactions occur during explosion of an atom bomb?

Discussion

39.	(a) Draw ray diagrams to show the formation of a three times magnified (i) real image (ii) virtual image, of an object kept in front of a converging lens. Mark the positions of object, F, 2F, O and position of image clearly in the diagram.(b) An object of size 5 cm is kept at a distance of 25 cm from the optical centre of a converging lens of focal length 10 cm. Calculate the distance of the image from the lens and size of the image.
Answer» (a) Draw ray diagrams to show the formation of a three times magnified (i) real image (ii) virtual image, of an object kept in front of a converging lens. Mark the positions of object, F, 2F, O and position of image clearly in the diagram. (b) An object of size 5 cm is kept at a distance of 25 cm from the optical centre of a converging lens of focal length 10 cm. Calculate the distance of the image from the lens and size of the image.

Discussion

40.	Show that current lags voltage by 90° in a.c. containing an ideal inductor
Answer» Show that current lags voltage by 90° in a.c. containing an ideal inductor

Discussion

41.	A plane wavefront of wave_{}lenght 6×10^{-7}m falls on a slit of width 0.4mm.A convex lens of focal lenght 0.8m placed behind the slit focusses the light on a screen.What is the linear width of second maxima
Answer» A plane wavefront of wave_{}lenght 6×10^{-7}m falls on a slit of width 0.4mm.A convex lens of focal lenght 0.8m placed behind the slit focusses the light on a screen.What is the linear width of second maxima

Discussion

42.	The power generated in a windmill
Answer» The power generated in a windmill

Discussion

43.	A coin is placed at the bottom of a beaker containing water (refractive index = 43) to a depth of 12 cm. By what height the coin appears to be raised when seen from vertically above?
Answer» A coin is placed at the bottom of a beaker containing water (refractive index = $\frac{4}{3}$ ) to a depth of 12 cm. By what height the coin appears to be raised when seen from vertically above?

Discussion

44.	why does the level of a diamagnetic liquid in the limb of a utube placed near the pole of an electromagnet, falls?
Answer» why does the level of a diamagnetic liquid in the limb of a utube placed near the pole of an electromagnet, falls?

Discussion

45.	What is the primary source of water?
Answer» What is the primary source of water?

Discussion

46.	Which of the following groups of forces could be in equilibrium
Answer» Which of the following groups of forces could be in equilibrium

Discussion

47.	In a step down transformer, ___ coil will have more current.
Answer» In a step down transformer, ___ coil will have more current.

Discussion

48.	A particle of mass m initially moving with speed v.A force acts on the particle f = kx where x is the distance travelled by the particle and k is constant.Find the speed of the particle when the work doneby the force equals W.
Answer» A particle of mass m initially moving with speed v.A force acts on the particle f = kx where x is the distance travelled by the particle and k is constant.Find the speed of the particle when the work doneby the force equals W.

Discussion

49.	24 Bond order of NO2 power negative and and NO2 power positive
Answer» 24 Bond order of NO2 power negative and and NO2 power positive

Discussion

50.	16.A ray of light is incident normally on the surface of an equilateral prism made up of material with refractive index 1.5 .the angle of deviation is ?
Answer» 16.A ray of light is incident normally on the surface of an equilateral prism made up of material with refractive index 1.5 .the angle of deviation is ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A compass needle of magnetic moment 60 Am2, pointing towards geographical north at a certain place where the horizontal component of earth's magnetic field is 40μwb m2 experiences a torque of 1.2×10−3 N-m . The declination at that place _____ (in degree) (Give integer value).

a resistance R draws power P when connected to an AC source,if an inductance is now placed in series with R ,such that impedance becomes Z, the power drawn will be

Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?

A bearm of white light is shone onto a glass prism. The light cannot be : (a) deviated (b) dispersed (c) focused (d) refracted

Velocity and acc. of a charged particle moving in a magnetic field at some ins†an t are v=3i+4j and a=2i+xj then a.x=-1.5b.magnetic field along z axis c. kinetic energy cons†an t d. 3 options correct

97.5 KJ mol2) The energy of activation for a first orderreaction is 104 kJ mol The rate constant at 25^° Cis 3.7 x105 s1 What is the rate constant at 30^° c?(7.4 x10 s)-1

28 A dilute aqueous solutions of sodium fluoride is electrolysed; the product at the anode and cathode are

Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum

A double convex lens has two surface of equal radii R and refractive index 1.5 ,then focal length i

A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is

A squre plate of side length a2 is removed from a uniform square plate of mass M and side length a as shown. Moment of inerti of remaining plate about an aixs which is passing thorugh centre O and perpendicular to plane of this plate, will beDiagram

Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.

A long ssolenoid of self induc†an ce L,not carrying any current is placed in a uniform magnetic field with its axis parallel to the direction of the field .The total magnetic flux linked with the solenoid is ϕ.Find the energy of the magnetic field contained inside the solenoid

How does the concave mirror used in satellite dishes strengthen weak signals?

An observer 1.5 m tall is 28.5 m away from a tower. The angle of elevation of the top of the tower from her eyes is 45∘. What is the height of the tower? [2 MARKS]

List down the drawbacks of a coal thermal power plant.

A conducting sphere of radius r is surrounded by a poorly conducting material of inner radius a and outer radius b whose resistivity ρ varies withρ=ρ_or^3. find the resis†an ce between the sphere and the outer surface of surrounding conducting mater

No refraction occurs when the light ray incident is ___ a boundary of two medium.

How many moles of sulphur atoms ad oxygen atoms are present in one mole each of H2SO4, H2O3 and SO2?

Ashwin pulls a load up an inclined plane. What forces must Ashwin overcome to pull it up? A. Contact force B. Gravitational force C. Frictional force

8. An equiconvex lens of ref. Index = 1.5 of focal length 10 cm is silvered on one side. It will behave like a _______ mirror of focal length __ cm. Fill in the blanks

124.One face of a rectangular glass plate 6cm thick is silvered. An object held 8cm in front of the first face, forms an image 12cm behind the silvered face. The refractive index of the glass is: 1) 1.2 2) 1.6 3) 1.5 4) 1.3

sodium is more electropositive than aluminium but still why is aluminium a better conductor than sodiu

Name a substance of which the specific resistance remains almost unchanged by the increase in temperature.

Is there any meaning of weight of the earth?

Arun has 2 bags of sugar, bag 1 has 13 kg of sugar and bag 2 has 13500 grams of sugar. Which of the following statement is correct?

The average distance between the Sun and Jupiter is 5.2 AU. This distance can also be written as

What are equivalent conductivity if they are connected in series and when connected in parallel Of two subs†an ces have conductivity σ1 and σ2 also find the equivalent resistivity if they are connected in series and when connected in parallel Of two subs†an ces have resistivity ρ1 and ρ2 .

In the circuit shown in figure, for what value of R will the power consumed by this resistance will be maximum.

Suppose you are on a roller coaster ride that is undergoing free fall. If you release a ball, from your perspective what can you say about the motion of the ball?

Which of the following is an axial vector?

0.5Ω In the circuit shown, the current in the 1Ω resistor is7.\lbrack JEE (Main 206V2Ω 1Ω 9V3Ω (a) 1.3 A, from P to Q(c) 0.13A irom Q to P(b) 0A(d) 0.13 A, frQom P to8. The roadi

Explain the shining of an air bubble in water.

An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?

Which of the following reactions occur during explosion of an atom bomb?

Show that current lags voltage by 90° in a.c. containing an ideal inductor

A plane wavefront of wave_{}lenght 6×10^{-7}m falls on a slit of width 0.4mm.A convex lens of focal lenght 0.8m placed behind the slit focusses the light on a screen.What is the linear width of second maxima

The power generated in a windmill

A coin is placed at the bottom of a beaker containing water (refractive index = 43) to a depth of 12 cm. By what height the coin appears to be raised when seen from vertically above?

why does the level of a diamagnetic liquid in the limb of a utube placed near the pole of an electromagnet, falls?

What is the primary source of water?

Which of the following groups of forces could be in equilibrium

In a step down transformer, ___ coil will have more current.

A particle of mass m initially moving with speed v.A force acts on the particle f = kx where x is the distance travelled by the particle and k is constant.Find the speed of the particle when the work doneby the force equals W.

24 Bond order of NO2 power negative and and NO2 power positive

16.A ray of light is incident normally on the surface of an equilateral prism made up of material with refractive index 1.5 .the angle of deviation is ?

8. An equiconvex lens of ref. Index = 1.5 of focal length 10 cm is silvered on one side. It will behave like a _____ mirror of focal length cm. Fill in the blanks