16569 + Interview Questions in Physics

1.	Constituents of nucleus of three atoms A, B and C are given below:A - 90 protons and 148 neutronsB - 92 protons and 146 neutronsC - 90 protons and 146 neutronsBased on the above data, which of these atoms are isotopes?
Answer» Constituents of nucleus of three atoms A, B and C are given below: A - 90 protons and 148 neutrons B - 92 protons and 146 neutrons C - 90 protons and 146 neutrons Based on the above data, which of these atoms are isotopes?

Discussion

2.	An object is placed at a distance of 20 cm from a convex mirror of a focal length of 15 cm. Find the position and nature of the image.
Answer» An object is placed at a distance of 20 cm from a convex mirror of a focal length of 15 cm. Find the position and nature of the image.

Discussion

3.	What happened to the money he had earned at Mrs Ruffner’s house?
Answer» What happened to the money he had earned at Mrs Ruffner’s house?

Discussion

4.	Fill in the following blanks with suitable words :(a) Parallel rays of light are reflected by a concave mirror to a point called the ___. (b) The focal length of a concave mirror is the distance from the ___ to the mirror.(c) A concave mirror ___rays of light whereas a convex mirror___rays of light. (d) For a convex mirror, parallel rays of light appear to diverge from a point called the___.
Answer» Fill in the following blanks with suitable words : (a) Parallel rays of light are reflected by a concave mirror to a point called the ___. (b) The focal length of a concave mirror is the distance from the ___ to the mirror. (c) A concave mirror ___rays of light whereas a convex mirror___rays of light. (d) For a convex mirror, parallel rays of light appear to diverge from a point called the___.

4.

Fill in the following blanks with suitable words :(a) Parallel rays of light are reflected by a concave mirror to a point called the _. (b) The focal length of a concave mirror is the distance from the _ to the mirror.(c) A concave mirror _rays of light whereas a convex mirror_rays of light. (d) For a convex mirror, parallel rays of light appear to diverge from a point called the___.

Answer»

Fill in the following blanks with suitable words :

(a) Parallel rays of light are reflected by a concave mirror to a point called the ___.

(b) The focal length of a concave mirror is the distance from the ___ to the mirror.

(c) A concave mirror ___rays of light whereas a convex mirror___rays of light.

(d) For a convex mirror, parallel rays of light appear to diverge from a point called the___.

Discussion

5.	An obliquely incident light ray bends at the surface due to change in speed, when passing from one medium to other. The ray does not bend when it is incident normally. Will the ray have different speed in other medium?
Answer» An obliquely incident light ray bends at the surface due to change in speed, when passing from one medium to other. The ray does not bend when it is incident normally. Will the ray have different speed in other medium?

Discussion

6.	Why does the Sun appear circular at noon?
Answer» Why does the Sun appear circular at noon?

Discussion

7.	A resistor of 8 Ω is connected in parallel with another resistor X. The resulting resistance of the combination is 4.8 Ω. What is the value of the resistor X?
Answer» A resistor of 8 $Ω$ is connected in parallel with another resistor X. The resulting resistance of the combination is 4.8 $Ω$ . What is the value of the resistor X?

Discussion

8.	A horizontal ray of light passes through a prism of index of refraction μ=1.50 & apex angle 4∘ and then strikes a vertical mirror, as shown in the figure. Through what angle must the mirror be rotated if after reflection the ray is to be horizontal?
Answer» A horizontal ray of light passes through a prism of index of refraction $μ = 1.50$ & apex angle $4^{\circ}$ and then strikes a vertical mirror, as shown in the figure. Through what angle must the mirror be rotated if after reflection the ray is to be horizontal?

Discussion

9.	5. A person stands on a plank kept on frictionlesssurface if there is sufficient friction between manand plank. If man slowly moves to other end ofplank. Find the distance moved by plank.(mm = 60 kg. mp-20 kg, L = 20 m)
Answer» 5. A person stands on a plank kept on frictionlesssurface if there is sufficient friction between manand plank. If man slowly moves to other end ofplank. Find the distance moved by plank.(mm = 60 kg. mp-20 kg, L = 20 m)

Discussion

10.	Name two devices which work on the heating effect of electric current.
Answer» Name two devices which work on the heating effect of electric current.

Discussion

11.	A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is
Answer» A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

11.

A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

Answer»

A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

Discussion

12.	A radioactive sample A decays to form B.(A→ B). The half life of A is t12=8 years. Only A is present at t=0. Find the time at which if we are able to pick one atom out of the sample, then probability of getting B is 15 times of getting A.
Answer» A radioactive sample $A$ decays to form $B$ . $(A \to B)$ . The half life of $A$ is $t_{\frac{1}{2}} = 8 years$ . Only $A$ is present at $t = 0$ . Find the time at which if we are able to pick one atom out of the sample, then probability of getting $B$ is $15$ times of getting $A$ .

Discussion

13.	A convex lens of focal length 15 cm is kept in front of the concave lens of focal length 30 cm. Find the power of the system of the lens.
Answer» A convex lens of focal length 15 cm is kept in front of the concave lens of focal length 30 cm. Find the power of the system of the lens.

Discussion

14.	Which of the following statement is correct with respect to geothermal energy?
Answer» Which of the following statement is correct with respect to geothermal energy?

Discussion

15.	Latent heat of vaporization of a liquid at 500K and 1 ATM pressure is 10 Kcal/mol. What will be the change in internal energy of 3 mol of liquid at same temperature and pressure.
Answer» Latent heat of vaporization of a liquid at 500K and 1 ATM pressure is 10 Kcal/mol. What will be the change in internal energy of 3 mol of liquid at same temperature and pressure.

Discussion

16.	Same current I is flowing in three infinitely long wires along positive x y and z directions The magnetic field at a point ( 0,0,-a )
Answer» Same current I is flowing in three infinitely long wires along positive x y and z directions The magnetic field at a point ( 0,0,-a )

Discussion

17.	In a pair of overlapping vertical photographs, the mean distance between the principal points is 95.90 mm. At the time of photography, the aircraft was 3000m above the terrain which was at datum level and the camera had a focal length of 250mm. A tower was observed and the difference in parallax measurements of its top and base was found to be 3.50mm. The height of the tower, the base of which is also at datum level, will be
Answer» In a pair of overlapping vertical photographs, the mean distance between the principal points is $95.90 m m$ . At the time of photography, the aircraft was $3000 m$ above the terrain which was at datum level and the camera had a focal length of $250 m m$ . A tower was observed and the difference in parallax measurements of its top and base was found to be $3.50 m m$ . The height of the tower, the base of which is also at datum level, will be

Discussion

18.	Derive the equation of motion
Answer» Derive the equation of motion

Discussion

19.	A pn junction acts as a ___ switch.
Answer» A pn junction acts as a ___ switch.

Discussion

20.	What step should be taken immediately if a person gets an electric shock after touching a live wire?
Answer» What step should be taken immediately if a person gets an electric shock after touching a live wire?

Discussion

21.	A sound wave is propagating as shown below. What is the speed of sound wave?
Answer» A sound wave is propagating as shown below. What is the speed of sound wave?

Discussion

22.	In a bottle opener, the fulcrum is:
Answer» In a bottle opener, the fulcrum is:

22.

In a bottle opener, the fulcrum is:

Answer»

In a bottle opener, the fulcrum is:

Discussion

23.	What is an earth electrode?
Answer» What is an earth electrode?

Discussion

24.	A printed page of is kept pressed by a glass cube (n=1.5) of edge 9 cm. By what amount will the printed letters appear to be shifted when viewed from the top?
Answer» A printed page of is kept pressed by a glass cube (n=1.5) of edge 9 cm. By what amount will the printed letters appear to be shifted when viewed from the top?

Discussion

25.	52 A particle of mass m moves with constant speed v on a circular path of radius r.Find magnitude of average force on it in half revolution.
Answer» 52 A particle of mass m moves with constant speed v on a circular path of radius r.Find magnitude of average force on it in half revolution.

Discussion

26.	ntA particle of mass m and charge q is projected onto a region having perpendicular magnetic field B. Find the angle of deviation of the particle as it comes out of the magnetic field of the width d of the region is very slightly smaller thann ntA) mv/qBn ntB) mv/2qBn ntC) 2mv/qBn
Answer» ntA particle of mass m and charge q is projected onto a region having perpendicular magnetic field B. Find the angle of deviation of the particle as it comes out of the magnetic field of the width d of the region is very slightly smaller thann ntA) mv/qBn ntB) mv/2qBn ntC) 2mv/qBn

Discussion

27.	An object is 20 cm away from a stationary concave mirror having focal length 15 cm. If the object moves with a speed of 5 m/s along the principal axis towards the mirror, then the speed of the image will be
Answer» An object is $20 cm$ away from a stationary concave mirror having focal length $15 cm$ . If the object moves with a speed of $5 m/s$ along the principal axis towards the mirror, then the speed of the image will be

Discussion

28.	A Galilean telescope has an objective lens of focal length 50 cm and eyepiece of focal length 5 cm. If the telescope is used to focus an object 2 m away from the objective lens, what should be the tube length? (Final image is forming at infinity.)
Answer» A Galilean telescope has an objective lens of focal length $50 cm$ and eyepiece of focal length $5 cm$ . If the telescope is used to focus an object $2 m$ away from the objective lens, what should be the tube length? (Final image is forming at infinity.)

Discussion

29.	Which of the following statement(s) is/are correct?A) Chlorine dioxide (CIO2) is powerful oxidisingagent but bleaching action is lower than Cl2 B) CIO2 is alkaline solution undergoesdisproportionation.C)Cio2 is diamagnetic in nature.D) Cl2 is a yellow gas but CIO2 is deep red liquidbelow 11^° C
Answer» Which of the following statement(s) is/are correct?A) Chlorine dioxide (CIO2) is powerful oxidisingagent but bleaching action is lower than Cl2 B) CIO2 is alkaline solution undergoesdisproportionation.C)Cio2 is diamagnetic in nature.D) Cl2 is a yellow gas but CIO2 is deep red liquidbelow 11^° C

Discussion

30.	Answer the following questions.a. How can we get the required amount of energy by connecting solar panels?b. What are the advantages and limitations of solar energy?
Answer» Answer the following questions. a. How can we get the required amount of energy by connecting solar panels? b. What are the advantages and limitations of solar energy?

Discussion

31.	The electric field of light wave is given as →E=103 cos(2π x5×10−7−2π×6×1014 t)^xNCThis light falls on a metal plate of work function 2 eV. The stopping potential of the photo-electrons isGiven, E(in eV)=12375λ(in Å)
Answer» The electric field of light wave is given as $\to E = 10^{3} cos (\frac{2 π x}{5 \times 10^{- 7}} - 2 π \times 6 \times 10^{14} t)^x \frac{N}{C}$ This light falls on a metal plate of work function $2 eV$ . The stopping potential of the photo-electrons is Given, $E (in eV) = \frac{12375}{λ (in Å)}$

Discussion

32.	Find the volume of hydrogen and oxygen on the electrolysis of water if 2 farady charge is passed through circuit .and the current efficiency is 25%?
Answer» Find the volume of hydrogen and oxygen on the electrolysis of water if 2 farady charge is passed through circuit .and the current efficiency is 25%?

Discussion

33.	At a place the angle of dip is 30° when dip circle is in geographical meridian and the dip angle is 45° when dip circle is in a plane perpendicular to geographical meridian. The dip angle in magnetic meridian is
Answer» At a place the angle of dip is 30° when dip circle is in geographical meridian and the dip angle is 45° when dip circle is in a plane perpendicular to geographical meridian. The dip angle in magnetic meridian is

Discussion

34.	A wire in the form of a circular loop of radius r lies with its plane normal to a magnetic field B. If the wire is polled to take a square shape in the same plane in time t, the emf induced in the loop is given by
Answer» A wire in the form of a circular loop of radius r lies with its plane normal to a magnetic field B. If the wire is polled to take a square shape in the same plane in time t, the emf induced in the loop is given by

Discussion

35.	For the logic circuit shown, the truth table is?
Answer» For the logic circuit shown, the truth table is?

Discussion

36.	62 The sun's angular diameter is measured to be 1920". The distance D of the sun from the earth is 1.49610 to the power 11 find the diameter of the sun.
Answer» 62 The sun's angular diameter is measured to be 1920". The distance D of the sun from the earth is 1.49610 to the power 11 find the diameter of the sun.

Discussion

37.	A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r′. The critical angle is
Answer» A ray of light from a denser medium strikes a rarer medium at an angle of incidence $i$ as shown in the figure. The reflected and refracted rays make an angle of $90^{\circ}$ with each other. The angles of reflection and refraction are $r$ and $r^{'}$ . The critical angle is

Discussion

38.	The magnifying power of a telescope is 9 in normal adjustment. When it is adjusted for parallel rays, the distance between the objective lens and the eyepiece is 20 cm. The focal length of the lenses are -
Answer» The magnifying power of a telescope is $9$ in normal adjustment. When it is adjusted for parallel rays, the distance between the objective lens and the eyepiece is $20 cm$ . The focal length of the lenses are -

Discussion

39.	The resistance of a rectangular block of copper of dimensions 2mm 2mm 5m between two square faces is 0.02 ohm. What is the resistivity of copper ?
Answer» The resistance of a rectangular block of copper of dimensions 2mm 2mm 5m between two square faces is 0.02 ohm. What is the resistivity of copper ?

Discussion

40.	Two 120v light bulb one of 25 W and The other of 200w were connected in series across a 240v line. One bulb.one bulb burnt out almost instantaneously .Which one was burnt and why?
Answer» Two 120v light bulb one of 25 W and The other of 200w were connected in series across a 240v line. One bulb.one bulb burnt out almost instantaneously .Which one was burnt and why?

Discussion

41.	Twenty cells each of emf E and internal resistance r are connected in series to form loop. if polarity of one of the cell is reversed, then terminal potential across this cell is
Answer» Twenty cells each of emf E and internal resistance r are connected in series to form loop. if polarity of one of the cell is reversed, then terminal potential across this cell is

Discussion

42.	2.What is Delta Star& concept for solving Circuits
Answer» 2.What is Delta Star& concept for solving Circuits

Discussion

43.	Differentiate cilliary muscles depending upon its relaxed or contracted positions.
Answer» Differentiate cilliary muscles depending upon its relaxed or contracted positions.

Discussion

44.	Listen and tell the sounds that these words in the poem produce.• cart ___________________• drinks ___________________Can you make these sounds?
Answer» Listen and tell the sounds that these words in the poem produce. • cart ___________________ • drinks ___________________ Can you make these sounds?

44.

Listen and tell the sounds that these words in the poem produce.• cart _• drinks _Can you make these sounds?

Answer»

Listen and tell the sounds that these words in the poem produce.
• cart ___________________
• drinks ___________________

Can you make these sounds?

Discussion

45.	When the live and neutral wires melt and come in contact with each other , it is said that both ,the live and neutral , wires carry current to the appliance ,Why? If the live is connected to the neutral ,the current should pass directly through the neutral wire and never reach the appliance ?
Answer» When the live and neutral wires melt and come in contact with each other , it is said that both ,the live and neutral , wires carry current to the appliance ,Why? If the live is connected to the neutral ,the current should pass directly through the neutral wire and never reach the appliance ?

Discussion

46.	The cost of fuel transportation is minimum in:
Answer» The cost of fuel transportation is minimum in:

Discussion

47.	The ratio of energy density of magnetic field at the centre of a current carrying due to the distance R by route to to from centre of loop on its axis
Answer» The ratio of energy density of magnetic field at the centre of a current carrying due to the distance R by route to to from centre of loop on its axis

Discussion

48.	Depletion of ozone layer is caused by [RPMT 2002]
Answer» Depletion of ozone layer is caused by [RPMT 2002]

48.

Depletion of ozone layer is caused by [RPMT 2002]

Answer»

Depletion of ozone layer is caused by

[RPMT 2002]

Discussion

49.	Draw magnetic field lines around a bar magnet.
Answer» Draw magnetic field lines around a bar magnet.

Discussion

50.	A current carrying solenoid produces a magnetic field around it. The distance of a point A, situated on the perpendicular bisector of the length of the solenoid, is R from its center. Another point P is situated on its axis, at a distance 4R from its center. Find the ratio of magnetic field at point P to the magnetic field at point A.
Answer» A current carrying solenoid produces a magnetic field around it. The distance of a point $A$ , situated on the perpendicular bisector of the length of the solenoid, is $R$ from its center. Another point $P$ is situated on its axis, at a distance $4 R$ from its center. Find the ratio of magnetic field at point $P$ to the magnetic field at point $A$ .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Constituents of nucleus of three atoms A, B and C are given below:A - 90 protons and 148 neutronsB - 92 protons and 146 neutronsC - 90 protons and 146 neutronsBased on the above data, which of these atoms are isotopes?

An object is placed at a distance of 20 cm from a convex mirror of a focal length of 15 cm. Find the position and nature of the image.

What happened to the money he had earned at Mrs Ruffner’s house?

An obliquely incident light ray bends at the surface due to change in speed, when passing from one medium to other. The ray does not bend when it is incident normally. Will the ray have different speed in other medium?

Why does the Sun appear circular at noon?

A resistor of 8 Ω is connected in parallel with another resistor X. The resulting resistance of the combination is 4.8 Ω. What is the value of the resistor X?

A horizontal ray of light passes through a prism of index of refraction μ=1.50 &amp; apex angle 4∘ and then strikes a vertical mirror, as shown in the figure. Through what angle must the mirror be rotated if after reflection the ray is to be horizontal?

5. A person stands on a plank kept on frictionlesssurface if there is sufficient friction between manand plank. If man slowly moves to other end ofplank. Find the distance moved by plank.(mm = 60 kg. mp-20 kg, L = 20 m)

Name two devices which work on the heating effect of electric current.

A partition divides a container having insulated walls into two compartments I and II. The same gas fills the two compartments [See Fig]. The ratio of the number of molecules in compartments I and II is

A radioactive sample A decays to form B.(A→ B). The half life of A is t12=8 years. Only A is present at t=0. Find the time at which if we are able to pick one atom out of the sample, then probability of getting B is 15 times of getting A.

A convex lens of focal length 15 cm is kept in front of the concave lens of focal length 30 cm. Find the power of the system of the lens.

Which of the following statement is correct with respect to geothermal energy?

Latent heat of vaporization of a liquid at 500K and 1 ATM pressure is 10 Kcal/mol. What will be the change in internal energy of 3 mol of liquid at same temperature and pressure.

Same current I is flowing in three infinitely long wires along positive x y and z directions The magnetic field at a point ( 0,0,-a )

Derive the equation of motion

A pn junction acts as a ___ switch.

What step should be taken immediately if a person gets an electric shock after touching a live wire?

A sound wave is propagating as shown below. What is the speed of sound wave?

In a bottle opener, the fulcrum is:

What is an earth electrode?

A printed page of is kept pressed by a glass cube (n=1.5) of edge 9 cm. By what amount will the printed letters appear to be shifted when viewed from the top?

52 A particle of mass m moves with constant speed v on a circular path of radius r.Find magnitude of average force on it in half revolution.

ntA particle of mass m and charge q is projected onto a region having perpendicular magnetic field B. Find the angle of deviation of the particle as it comes out of the magnetic field of the width d of the region is very slightly smaller thann ntA) mv/qBn ntB) mv/2qBn ntC) 2mv/qBn

An object is 20 cm away from a stationary concave mirror having focal length 15 cm. If the object moves with a speed of 5 m/s along the principal axis towards the mirror, then the speed of the image will be

A Galilean telescope has an objective lens of focal length 50 cm and eyepiece of focal length 5 cm. If the telescope is used to focus an object 2 m away from the objective lens, what should be the tube length? (Final image is forming at infinity.)

Which of the following statement(s) is/are correct?A) Chlorine dioxide (CIO2) is powerful oxidisingagent but bleaching action is lower than Cl2 B) CIO2 is alkaline solution undergoesdisproportionation.C)Cio2 is diamagnetic in nature.D) Cl2 is a yellow gas but CIO2 is deep red liquidbelow 11^° C

Answer the following questions.a. How can we get the required amount of energy by connecting solar panels?b. What are the advantages and limitations of solar energy?

The electric field of light wave is given as →E=103 cos(2π x5×10−7−2π×6×1014 t)^xNCThis light falls on a metal plate of work function 2 eV. The stopping potential of the photo-electrons isGiven, E(in eV)=12375λ(in Å)

Find the volume of hydrogen and oxygen on the electrolysis of water if 2 farady charge is passed through circuit .and the current efficiency is 25%?

At a place the angle of dip is 30° when dip circle is in geographical meridian and the dip angle is 45° when dip circle is in a plane perpendicular to geographical meridian. The dip angle in magnetic meridian is

A wire in the form of a circular loop of radius r lies with its plane normal to a magnetic field B. If the wire is polled to take a square shape in the same plane in time t, the emf induced in the loop is given by

For the logic circuit shown, the truth table is?

62 The sun's angular diameter is measured to be 1920". The distance D of the sun from the earth is 1.49610 to the power 11 find the diameter of the sun.

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r′. The critical angle is

The magnifying power of a telescope is 9 in normal adjustment. When it is adjusted for parallel rays, the distance between the objective lens and the eyepiece is 20 cm. The focal length of the lenses are -

The resistance of a rectangular block of copper of dimensions 2mm 2mm 5m between two square faces is 0.02 ohm. What is the resistivity of copper ?

Two 120v light bulb one of 25 W and The other of 200w were connected in series across a 240v line. One bulb.one bulb burnt out almost instantaneously .Which one was burnt and why?

Twenty cells each of emf E and internal resistance r are connected in series to form loop. if polarity of one of the cell is reversed, then terminal potential across this cell is

2.What is Delta Star& concept for solving Circuits

Differentiate cilliary muscles depending upon its relaxed or contracted positions.

Listen and tell the sounds that these words in the poem produce.• cart ___________________• drinks ___________________Can you make these sounds?

When the live and neutral wires melt and come in contact with each other , it is said that both ,the live and neutral , wires carry current to the appliance ,Why? If the live is connected to the neutral ,the current should pass directly through the neutral wire and never reach the appliance ?

The cost of fuel transportation is minimum in:

The ratio of energy density of magnetic field at the centre of a current carrying due to the distance R by route to to from centre of loop on its axis

Depletion of ozone layer is caused by [RPMT 2002]

Draw magnetic field lines around a bar magnet.

A horizontal ray of light passes through a prism of index of refraction μ=1.50 & apex angle 4∘ and then strikes a vertical mirror, as shown in the figure. Through what angle must the mirror be rotated if after reflection the ray is to be horizontal?

Listen and tell the sounds that these words in the poem produce.• cart _• drinks _Can you make these sounds?