16569 + Interview Questions in Physics

1.	Which colour has the highest Dispersion of light? a) blueb) violetc) redd) yellow
Answer» Which colour has the highest Dispersion of light? a) blue b) violet c) red d) yellow

Discussion

2.	The acceleration due to gravity g and mean density of the earth ρ are related by which of the following relations ?(Where G is the gravitational constant and R is the radius of the earth.)
Answer» The acceleration due to gravity $g$ and mean density of the earth $ρ$ are related by which of the following relations ? $($ Where $G$ is the gravitational constant and $R$ is the radius of the earth. $)$

Discussion

3.	A telescope has an objective of focal length 30 cm and an eyepiece of focal length 3.0 cm. It is focussed on a scale present at a distance of 2.0 m. For seeing with relaxed eye, calculate the separation between the objective and the eyepiece.
Answer» A telescope has an objective of focal length $30 cm$ and an eyepiece of focal length $3.0 cm .$ It is focussed on a scale present at a distance of $2.0 m$ . For seeing with relaxed eye, calculate the separation between the objective and the eyepiece.

Discussion

4.	(a) What is calorimeter? (b) Name the material of which it is made of. Give two reasons for using the material stated by you. (c) Out of the three metals A,B and C of specific heat capacity 900 J kg−1 ∘C−1,380Jkg−1 ∘C−1 and 460Jkg−1 ∘C−1 respectively,which will you prefer for calorimeter? Give reason. (d) How is the loss of heat due to radiation minimized in a calorimeter?
Answer» (a) What is calorimeter? (b) Name the material of which it is made of. Give two reasons for using the material stated by you. (c) Out of the three metals A,B and C of specific heat capacity 900 J k $g^{- 1}^{\circ} C^{- 1}, 380 J k g^{- 1}^{\circ} C^{- 1} a n d 460 J k g^{- 1}^{\circ} C^{- 1}$ respectively,which will you prefer for calorimeter? Give reason. (d) How is the loss of heat due to radiation minimized in a calorimeter?

4.

(a) What is calorimeter? (b) Name the material of which it is made of. Give two reasons for using the material stated by you. (c) Out of the three metals A,B and C of specific heat capacity 900 J kg−1 ∘C−1,380Jkg−1 ∘C−1 and 460Jkg−1 ∘C−1 respectively,which will you prefer for calorimeter? Give reason. (d) How is the loss of heat due to radiation minimized in a calorimeter?

Answer»

(a) What is calorimeter?

(b) Name the material of which it is made of. Give two reasons for using the material stated by you.

(c) Out of the three metals A,B and C of specific heat capacity 900 J k $g^{- 1}^{\circ} C^{- 1}, 380 J k g^{- 1}^{\circ} C^{- 1} a n d 460 J k g^{- 1}^{\circ} C^{- 1}$ respectively,which will you prefer for calorimeter? Give reason.

(d) How is the loss of heat due to radiation minimized in a calorimeter?

Discussion

5.	Explain cork-screw rule.
Answer» Explain cork-screw rule.

Discussion

6.	A current carrying conductor of length l is bent into two loops one by one. Frost loop has one turn of wire and second loop has two turns of wire. Compare the magnetic fields at the centre of the loops.
Answer» A current carrying conductor of length l is bent into two loops one by one. Frost loop has one turn of wire and second loop has two turns of wire. Compare the magnetic fields at the centre of the loops.

Discussion

7.	What are converging and diverging rays . (Is Meet of incident rays are called converging rays)
Answer» What are converging and diverging rays . (Is Meet of incident rays are called converging rays)

Discussion

8.	What is a solar cell panel? State its two main advantages.
Answer» What is a solar cell panel? State its two main advantages.

Discussion

9.	Particle is projected from the ground with 80 m/s at an angle of 30 degree with horizontal from ground. The magnitude of average velocity in time interval t= 2 s to t= 6s is ?
Answer» Particle is projected from the ground with 80 m/s at an angle of 30 degree with horizontal from ground. The magnitude of average velocity in time interval t= 2 s to t= 6s is ?

Discussion

10.	The thickest pin in an electrical plug corresponds to ___ pin.
Answer» The thickest pin in an electrical plug corresponds to ___ pin.

Discussion

11.	the distance between two spherical bodies increased to two times then by how many times the mass of one of the body is to be changed to maintain the same gravitational force
Answer» the distance between two spherical bodies increased to two times then by how many times the mass of one of the body is to be changed to maintain the same gravitational force

Discussion

12.	{ Q }17/200 A thin converging lens of focal length }f=1.5m} is placed along y-axis such that its optical centre }{ coincides with origin. A small light source }S is placed at }}{ location }(-2.0m,0.1m). A plane mirror is placed at }x=5m}{ inclined at }θ=\operatorname{tan}^{-1}(0.3) as shown in the figure. The }} coordinate of final image is
Answer» { Q }17/200 A thin converging lens of focal length }f=1.5m} is placed along y-axis such that its optical centre }{ coincides with origin. A small light source }S is placed at }}{ location }(-2.0m,0.1m). A plane mirror is placed at }x=5m}{ inclined at }θ=\operatorname{tan}^{-1}(0.3) as shown in the figure. The }} coordinate of final image is

Discussion

13.	93. If E is the total energy emitted by the body at a temperature T K and Emax is the maximum spectal energy emitted by it at the same temperature,then
Answer» 93. If E is the total energy emitted by the body at a temperature T K and Emax is the maximum spectal energy emitted by it at the same temperature,then

Discussion

14.	A person can see clearly objects only when they lie between 40 cm and 250 cm respectively. The minimum power of the lens he/she should use while reading at 25 cm is
Answer» A person can see clearly objects only when they lie between $40 cm$ and $250 cm$ respectively. The minimum power of the lens he/she should use while reading at $25 cm$ is

Discussion

15.	131.If two bulbs of power 60 watt and 100 watt respectively is rated 110 volt are connected in series with supply of 220 volt then which bulb will fuse ,if not why?
Answer» 131.If two bulbs of power 60 watt and 100 watt respectively is rated 110 volt are connected in series with supply of 220 volt then which bulb will fuse ,if not why?

Discussion

16.	The product of petroleum used to drive heavy vehicles like trucks is : (a) petrol (b) kerosene (c) diesel (d) petroleum gas
Answer» The product of petroleum used to drive heavy vehicles like trucks is : (a) petrol (b) kerosene (c) diesel (d) petroleum gas

Discussion

17.	The curvature radii of a concavo-convex glass lens are 20 cm and 60 cm. The convex surface of the lens is silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is (μ of glass =1.5,μ of water =4/3)
Answer» The curvature radii of a concavo-convex glass lens are $20 c m$ and $60 c m$ . The convex surface of the lens is silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is $(μ of glass = 1.5, μ of water = 4 / 3)$

Discussion

18.	How to find velocity
Answer» How to find velocity

Discussion

19.	What is meant by the power of accommodation of a human eye?
Answer» What is meant by the power of accommodation of a human eye?

Discussion

20.	A plate thickness t made of a material of refractive index μ is placed in front of one of the slits in a double-slits experiment. What should be the minimum thickness t which will make the intensity at the centre of the fringe pattern zero?
Answer» A plate thickness $t$ made of a material of refractive index $μ$ is placed in front of one of the slits in a double-slits experiment. What should be the minimum thickness $t$ which will make the intensity at the centre of the fringe pattern zero?

Discussion

21.	An object is placed 10 cm from a diverging lens, which forms an image 6.5 cm from the lens. What is the focal length of the lens?
Answer» An object is placed 10 cm from a diverging lens, which forms an image 6.5 cm from the lens. What is the focal length of the lens?

Discussion

22.	The speed of light is maximum in(a) glass (b) water (c) air (d) wood
Answer» The speed of light is maximum in (a) glass (b) water (c) air (d) wood

Discussion

23.	a particle moves on a parabolic path y^2 =4ax if its distance from focus is minimum
Answer» a particle moves on a parabolic path y^2 =4ax if its distance from focus is minimum

Discussion

24.	The electric current in a circuit is given by i=i0Tt, where t is time and T is time period. Calculate the rms current for the period t=0 to t=T.
Answer» The electric current in a circuit is given by $i = \frac{i_{0}}{T} t$ , where $t$ is time and $T$ is time period. Calculate the rms current for the period $t = 0$ to $t = T$ .

Discussion

25.	Complete the following statements : When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ............ wavelength .............. light is able to reach us. Sunset is therefore ............
Answer» Complete the following statements : When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ............ wavelength .............. light is able to reach us. Sunset is therefore ............

Discussion

26.	A concave lens has a focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens ? Also calculate the size of the image formed.
Answer» A concave lens has a focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens ? Also calculate the size of the image formed.

Discussion

27.	Which of the following circuits provide full-wave rectification of an a.c. input ?
Answer» Which of the following circuits provide full-wave rectification of an a.c. input ?

Discussion

28.	Optic axis of an equiconvex lens is the x axis the coordinates of point object and its image are (- 41 cm and 1 cm)and (50 cm,- 2 cm) respectively lens is located at
Answer» Optic axis of an equiconvex lens is the x axis the coordinates of point object and its image are (- 41 cm and 1 cm)and (50 cm,- 2 cm) respectively lens is located at

Discussion

29.	Find the word common to the following that helps in managing waste.
Answer» Find the word common to the following that helps in managing waste.

Discussion

30.	Question 7Which of the following statements is correct regarding rods and cones in the human eye?(a) Cones are sensitive to dim light(b) Cones are sensitive to bright light(c) Rods are sensitive to bright light(d) Rods can sense colour
Answer» Question 7 Which of the following statements is correct regarding rods and cones in the human eye? (a) Cones are sensitive to dim light (b) Cones are sensitive to bright light (c) Rods are sensitive to bright light (d) Rods can sense colour

30.

Question 7Which of the following statements is correct regarding rods and cones in the human eye?(a) Cones are sensitive to dim light(b) Cones are sensitive to bright light(c) Rods are sensitive to bright light(d) Rods can sense colour

Answer»

Question 7

Which of the following statements is correct regarding rods and cones in the human eye?

(a) Cones are sensitive to dim light

(b) Cones are sensitive to bright light

(c) Rods are sensitive to bright light

(d) Rods can sense colour

Discussion

31.	Which of the common parts are necessary for generating electricity in thermal, hydro, wind and geothermal plants?
Answer» Which of the common parts are necessary for generating electricity in thermal, hydro, wind and geothermal plants?

Discussion

32.	how to do double integreation
Answer» how to do double integreation

Discussion

33.	why addition of solute lowers freezing point of the liquid ?
Answer» why addition of solute lowers freezing point of the liquid ?

Discussion

34.	Define(1) Magnetic field(2) Solenoid(3) Electric motor
Answer» Define (1) Magnetic field (2) Solenoid (3) Electric motor

34.

Define(1) Magnetic field(2) Solenoid(3) Electric motor

Answer»

Define

(1) Magnetic field

(2) Solenoid

(3) Electric motor

Discussion

35.	An ammeter A of finite resistance, and a resistor R are joined in series to an ideal cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is V0. P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V –
Answer» An ammeter $A$ of finite resistance, and a resistor $R$ are joined in series to an ideal cell $C$ . A potentiometer $P$ is joined in parallel to $R$ . The ammeter reading is $I_{0}$ and the potentiometer reading is $V_{0}$ . $P$ is now replaced by a voltmeter of finite resistance. The ammeter reading now is $I$ and the voltmeter reading is $V$ –

Discussion

36.	12. The locus of point of trisection of the focal chords of the parabola ,y2=4ax is.
Answer» 12. The locus of point of trisection of the focal chords of the parabola ,y2=4ax is.

Discussion

37.	21.A virtual image of half the size of the object is formed by a convex mirror at a distance of 30cm from the object. What is the radius of curvature of the mirror?
Answer» 21.A virtual image of half the size of the object is formed by a convex mirror at a distance of 30cm from the object. What is the radius of curvature of the mirror?

Discussion

38.	An object is kept on the principal axis of a convex mirror of focal length 10 cm at a distance of 10 cm from the pole. The object starts moving at a velocity 20 mm/s towards the mirror at an angle 30∘ with the principal axis. What will be the velocity of its image and the angle it makes with the principal axis at that instant?
Answer» An object is kept on the principal axis of a convex mirror of focal length $10 cm$ at a distance of $10 cm$ from the pole. The object starts moving at a velocity $20 mm/s$ towards the mirror at an angle $30^{\circ}$ with the principal axis. What will be the velocity of its image and the angle it makes with the principal axis at that instant?

Discussion

39.	An electron of mass m and charge e initially at rest gets accelerated by a constant electric field E. The rate of change of de-Broglie wavelength of this electron at time t, is (ignore the relativistic effects)
Answer» An electron of mass $m$ and charge $e$ initially at rest gets accelerated by a constant electric field $E .$ The rate of change of de-Broglie wavelength of this electron at time $t,$ is (ignore the relativistic effects)

Discussion

40.	If AC current changes its direction, then how it can be transported to our homes covering a large distance
Answer» If AC current changes its direction, then how it can be transported to our homes covering a large distance

Discussion

41.	Name two sources of energy that you think are renewable. Give reason for your choice.
Answer» Name two sources of energy that you think are renewable. Give reason for your choice.

Discussion

42.	In a hydrogen atom an electron of mass m and charge e revolves in an orbit of radius r making n revolutions per second if the mass of hydrogen nucleus is M the magnetic moment associated with the orbital motion of electron is
Answer» In a hydrogen atom an electron of mass m and charge e revolves in an orbit of radius r making n revolutions per second if the mass of hydrogen nucleus is M the magnetic moment associated with the orbital motion of electron is

Discussion

43.	A particle performing uniform circular motion has angular momentum L. if its angular frequency doubled and its kinetic energy half then the new angular momentum is
Answer» A particle performing uniform circular motion has angular momentum L. if its angular frequency doubled and its kinetic energy half then the new angular momentum is

Discussion

44.	Which of the following is used for safety measures?
Answer» Which of the following is used for safety measures?

Discussion

45.	State the Principles behind working of HOT CATHODE RAY TUBE.
Answer» State the Principles behind working of HOT CATHODE RAY TUBE.

Discussion

46.	24.The magnetic flux through a stationary loop with resR varies during of time T as phy = at(T-t) . The heat generated during this time neglecting the inductance of the loop will be ??
Answer» 24.The magnetic flux through a stationary loop with resR varies during of time T as phy = at(T-t) . The heat generated during this time neglecting the inductance of the loop will be ??

Discussion

47.	A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction.
Answer» A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction.

Discussion

48.	A concave lens produces an image 20 cm from the lens for an object placed 30 cm from the lens. The focal length is
Answer» A concave lens produces an image 20 cm from the lens for an object placed 30 cm from the lens. The focal length is

Discussion

49.	A uniform disc of radius R (3 m) has a round disc of radius R/3 cut from it as shown in the figure. The mass of the remaining (shaded) portion of the disc equals M (2 kg). The moment of inertia of such a disc relative to the axis passing through the geometrical centre of the original disc and perpendicular to the plane of the disc is x kgm2. Then the value of x is
Answer» A uniform disc of radius $R$ ( $3 m$ ) has a round disc of radius $R / 3$ cut from it as shown in the figure. The mass of the remaining (shaded) portion of the disc equals $M$ ( $2 k g$ ). The moment of inertia of such a disc relative to the axis passing through the geometrical centre of the original disc and perpendicular to the plane of the disc is $x k g m^{2}$ . Then the value of $x$ is

Discussion

50.	Question 9Which part of the solar cooker is responsible for greenhouse effect?(a) Coating with black colour inside the box(b) Mirror(c) Glass sheet(d) Outer cover of the solar cooker
Answer» Question 9 Which part of the solar cooker is responsible for greenhouse effect? (a) Coating with black colour inside the box (b) Mirror (c) Glass sheet (d) Outer cover of the solar cooker

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which colour has the highest Dispersion of light? a) blueb) violetc) redd) yellow

The acceleration due to gravity g and mean density of the earth ρ are related by which of the following relations ?(Where G is the gravitational constant and R is the radius of the earth.)

A telescope has an objective of focal length 30 cm and an eyepiece of focal length 3.0 cm. It is focussed on a scale present at a distance of 2.0 m. For seeing with relaxed eye, calculate the separation between the objective and the eyepiece.

Explain cork-screw rule.

A current carrying conductor of length l is bent into two loops one by one. Frost loop has one turn of wire and second loop has two turns of wire. Compare the magnetic fields at the centre of the loops.

What are converging and diverging rays . (Is Meet of incident rays are called converging rays)

What is a solar cell panel? State its two main advantages.

Particle is projected from the ground with 80 m/s at an angle of 30 degree with horizontal from ground. The magnitude of average velocity in time interval t= 2 s to t= 6s is ?

The thickest pin in an electrical plug corresponds to ___ pin.

the distance between two spherical bodies increased to two times then by how many times the mass of one of the body is to be changed to maintain the same gravitational force

93. If E is the total energy emitted by the body at a temperature T K and Emax is the maximum spectal energy emitted by it at the same temperature,then

A person can see clearly objects only when they lie between 40 cm and 250 cm respectively. The minimum power of the lens he/she should use while reading at 25 cm is

131.If two bulbs of power 60 watt and 100 watt respectively is rated 110 volt are connected in series with supply of 220 volt then which bulb will fuse ,if not why?

The product of petroleum used to drive heavy vehicles like trucks is : (a) petrol (b) kerosene (c) diesel (d) petroleum gas

The curvature radii of a concavo-convex glass lens are 20 cm and 60 cm. The convex surface of the lens is silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is (μ of glass =1.5,μ of water =4/3)

How to find velocity

What is meant by the power of accommodation of a human eye?

A plate thickness t made of a material of refractive index μ is placed in front of one of the slits in a double-slits experiment. What should be the minimum thickness t which will make the intensity at the centre of the fringe pattern zero?

An object is placed 10 cm from a diverging lens, which forms an image 6.5 cm from the lens. What is the focal length of the lens?

The speed of light is maximum in(a) glass (b) water (c) air (d) wood

a particle moves on a parabolic path y^2 =4ax if its distance from focus is minimum

The electric current in a circuit is given by i=i0Tt, where t is time and T is time period. Calculate the rms current for the period t=0 to t=T.

Complete the following statements : When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ............ wavelength .............. light is able to reach us. Sunset is therefore ............

A concave lens has a focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens ? Also calculate the size of the image formed.

Which of the following circuits provide full-wave rectification of an a.c. input ?

Optic axis of an equiconvex lens is the x axis the coordinates of point object and its image are (- 41 cm and 1 cm)and (50 cm,- 2 cm) respectively lens is located at

Find the word common to the following that helps in managing waste.

Question 7Which of the following statements is correct regarding rods and cones in the human eye?(a) Cones are sensitive to dim light(b) Cones are sensitive to bright light(c) Rods are sensitive to bright light(d) Rods can sense colour

Which of the common parts are necessary for generating electricity in thermal, hydro, wind and geothermal plants?

how to do double integreation

why addition of solute lowers freezing point of the liquid ?

Define(1) Magnetic field(2) Solenoid(3) Electric motor

12. The locus of point of trisection of the focal chords of the parabola ,y2=4ax is.

21.A virtual image of half the size of the object is formed by a convex mirror at a distance of 30cm from the object. What is the radius of curvature of the mirror?

An electron of mass m and charge e initially at rest gets accelerated by a constant electric field E. The rate of change of de-Broglie wavelength of this electron at time t, is (ignore the relativistic effects)

If AC current changes its direction, then how it can be transported to our homes covering a large distance

Name two sources of energy that you think are renewable. Give reason for your choice.

In a hydrogen atom an electron of mass m and charge e revolves in an orbit of radius r making n revolutions per second if the mass of hydrogen nucleus is M the magnetic moment associated with the orbital motion of electron is

A particle performing uniform circular motion has angular momentum L. if its angular frequency doubled and its kinetic energy half then the new angular momentum is

Which of the following is used for safety measures?

State the Principles behind working of HOT CATHODE RAY TUBE.

24.The magnetic flux through a stationary loop with resR varies during of time T as phy = at(T-t) . The heat generated during this time neglecting the inductance of the loop will be ??

A student cannot see a chart hanging on a wall placed at a distance of 3 m from him. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagrams for the (i) defect of vision and also (ii) for its correction.

A concave lens produces an image 20 cm from the lens for an object placed 30 cm from the lens. The focal length is

Question 9Which part of the solar cooker is responsible for greenhouse effect?(a) Coating with black colour inside the box(b) Mirror(c) Glass sheet(d) Outer cover of the solar cooker