50278 + Interview Questions in Physics

1.	ntIn a single slit diffraction of light of wavelengths by a slit of width e,the size of the central maximum on a screen at a distance b is?n
Answer» ntIn a single slit diffraction of light of wavelengths by a slit of width e,the size of the central maximum on a screen at a distance b is?n

Discussion

2.	Three capacitors of capacitance 6μF each are available. The minimum and maximum capacitance which may be obtained are
Answer» Three capacitors of capacitance $6 μ F$ each are available. The minimum and maximum capacitance which may be obtained are

Discussion

3.	A flat plate is moving normal to its plane through a gas under the action of a constant force F. The gas is kept at a very low pressure. The speed of the plate v is much less than the average speed u of the gas molecules. Which of the following options is/are true?
Answer» A flat plate is moving normal to its plane through a gas under the action of a constant force $F$ . The gas is kept at a very low pressure. The speed of the plate $v$ is much less than the average speed $u$ of the gas molecules. Which of the following options is/are true?

Discussion

4.	In the HCl molecule, the separation between the nuclei of the two atoms is about 1.27 Å (1 Å = 10-10 m). Find the approximate location of the CM of the molecule, given that a chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus.
Answer» In the HCl molecule, the separation between the nuclei of the two atoms is about 1.27 Å (1 Å = 10-10 m). Find the approximate location of the CM of the molecule, given that a chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus.

Discussion

5.	Explain why, a runner presses the ground with his feet before he starts his run.
Answer» Explain why, a runner presses the ground with his feet before he starts his run.

Discussion

6.	27 drops of the same size are charged to 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
Answer» $27$ drops of the same size are charged to $220 V$ each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

Discussion

7.	A point dipole (P) is placed at origin, potential at point A is V volts, then potential at point B is
Answer» A point dipole (P) is placed at origin, potential at point A is $V volts$ , then potential at point B is

Discussion

8.	Displacement of a body is varying according to the equation s = t 2 + t 3 , find its velocity at t= 5s
Answer» Displacement of a body is varying according to the equation s = t 2 + t 3 , find its velocity at t= 5s

Discussion

9.	200 MeV of energy may be obtained per atom, in the nuclear fission reaction of U235. A nuclear reactor is generating a constant power of 1000 kW. The number of atoms undergoing fission per second is,
Answer» $200 MeV$ of energy may be obtained per atom, in the nuclear fission reaction of $U^{235}$ . A nuclear reactor is generating a constant power of $1000 kW$ . The number of atoms undergoing fission per second is,

Discussion

10.	Two plates of parallel plate capacitve transducer are 30 mm apart and the space is filled with two different dielectric materials, one material is 1 cm thick with a dielectric constant of 5 and the other material is 20 mm thick with a dielectirc constant 10. If the capacitive transducer were to be made up of a single dielectric material then the dielectric constant of the signle material is7.5
Answer» Two plates of parallel plate capacitve transducer are $30 m m$ apart and the space is filled with two different dielectric materials, one material is $1 c m$ thick with a dielectric constant of $5$ and the other material is $20 m m$ thick with a dielectirc constant $10$ . If the capacitive transducer were to be made up of a single dielectric material then the dielectric constant of the signle material is 7.5

Discussion

11.	71. An iron cube is drawn into a uniform wire of length L.The elongation produced in this wire by a constant force F is proportinal to ?
Answer» 71. An iron cube is drawn into a uniform wire of length L.The elongation produced in this wire by a constant force F is proportinal to ?

Discussion

12.	A mobile phone gets fully charged in 3 hours and, when kept idle, it drains 1% of the battery every 9 minutes. If the completely discharged mobile phone is charged for 2.25 hours and then unplugged and kept idle for 3 hours, what would be the remaining charge in the phone's battery?
Answer» A mobile phone gets fully charged in 3 hours and, when kept idle, it drains $1 %$ of the battery every 9 minutes. If the completely discharged mobile phone is charged for 2.25 hours and then unplugged and kept idle for 3 hours, what would be the remaining charge in the phone's battery?

Discussion

13.	How many significant figures are present in the number 8300.00?
Answer» How many significant figures are present in the number 8300.00?

Discussion

14.	A wire is attached to a pan of mass 100 g that contains a 1 kg mass as shown in the figure. When the wire is plucked, it vibrates at a fundamental frequency of 110 Hz. An additional mass M is then added to the pan and the fundamental frequency changes to 130 Hz. The value of mass M is[Assume the pulley to act like a fixed support]
Answer» A wire is attached to a pan of mass $100 g$ that contains a $1 kg$ mass as shown in the figure. When the wire is plucked, it vibrates at a fundamental frequency of $110 Hz$ . An additional mass $M$ is then added to the pan and the fundamental frequency changes to $130 Hz$ . The value of mass $M$ is [Assume the pulley to act like a fixed support]

Discussion

15.	A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately be:
Answer» A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately be:

15.

A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately be:

Answer»

A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately

be:

Discussion

16.	The distance between the plates of a parallel plate capacitor is 0.05 m. An electric field of magnitude 3×104 V/m is established between the plates by connecting it to a battery. It is disconnected from the battery and an uncharged plate of thickness 0.01 m and dielectric constant k=2 is inserted then, what will be the magnitude of difference in potential difference (in kV) between plates?
Answer» The distance between the plates of a parallel plate capacitor is $0.05 m$ . An electric field of magnitude $3 \times 10^{4} V/m$ is established between the plates by connecting it to a battery. It is disconnected from the battery and an uncharged plate of thickness $0.01 m$ and dielectric constant $k = 2$ is inserted then, what will be the magnitude of difference in potential difference (in $kV$ ) between plates?

Discussion

17.	Why torque is maximum at 90 degrees ?
Answer» Why torque is maximum at 90 degrees ?

Discussion

18.	Two blocks A and B of masses 10 kg and 5 kg respectively are connected through an inextensible string, as shown in the figure. A force of magnitude 10 N is applied on block A in horizontal direction. The acceleration of block B at this instant will be (all surfaces are smooth and g = 10 m/s2)
Answer» Two blocks A and B of masses 10 kg and 5 kg respectively are connected through an inextensible string, as shown in the figure. A force of magnitude 10 N is applied on block A in horizontal direction. The acceleration of block B at this instant will be (all surfaces are smooth and g = 10 m/s2)

Discussion

19.	Q)If a body starting from the rest travels with a uniform acceleration of 10 ms–2 for first 10 second and with uniform acceleration 5 ms–2 for next 20 seconds, then average acceleration of the body for 30 s is
Answer» Q)If a body starting from the rest travels with a uniform acceleration of 10 ms–2 for first 10 second and with uniform acceleration 5 ms–2 for next 20 seconds, then average acceleration of the body for 30 s is

Discussion

20.	A double convex lens of focal length 40 cm is bisected vertically. Is there any change in the focal length and power of the lens?
Answer» A double convex lens of focal length 40 cm is bisected vertically. Is there any change in the focal length and power of the lens?

Discussion

21.	If →A=9^i−7^j+5^k and →B=3^i−2^j−6^k, then the value of (→A+→B)⋅(→A−→B) is
Answer» If $\to A = 9^i - 7^j + 5^k$ and $\to B = 3^i - 2^j - 6^k$ , then the value of $(\to A + \to B) \cdot (\to A - \to B)$ is

Discussion

22.	If the wavelength associated with a proton is 2.5×10−13 m, then determine the voltage through which it is accelerated.
Answer» If the wavelength associated with a proton is $2.5 \times 10^{- 13} m$ , then determine the voltage through which it is accelerated.

Discussion

23.	In a young's double slit experiment λ=500 nm , d = 1.0 mm and D = 1.0 m. Find the minimum distance frm the central maximum fro which the intensity is half of the maximum intensity.
Answer» In a young's double slit experiment $λ = 500$ nm , d = 1.0 mm and D = 1.0 m. Find the minimum distance frm the central maximum fro which the intensity is half of the maximum intensity.

Discussion

24.	A pulley-block system as shown in the figure is released from rest. What is the magnitude of acceleration of COM of pulley-block system? (Take g=10 m/s2)
Answer» A pulley-block system as shown in the figure is released from rest. What is the magnitude of acceleration of $COM$ of pulley-block system? (Take $g = 10 {m/s}^{2}$ )

Discussion

25.	A bar magnet of length l and magnetic dipole moment M is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be
Answer» A bar magnet of length $l$ and magnetic dipole moment $M$ is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

Discussion

26.	A beam of light is incident on an equilateral glass prism at an angle of 45o and emerges out an angle of 35o. Calculate the angle of deviation of the light beam.
Answer» A beam of light is incident on an equilateral glass prism at an angle of $45^{o}$ and emerges out an angle of $35^{o}$ . Calculate the angle of deviation of the light beam.

Discussion

27.	A 3 kg block is pulled by a force which is inclined at 37∘ to the horizontal table. The friction coefficient between the table and block is 1/3. For what minimum value of this force, will the block start sliding?
Answer» A $3 kg$ block is pulled by a force which is inclined at $37^{\circ}$ to the horizontal table. The friction coefficient between the table and block is 1/3. For what minimum value of this force, will the block start sliding?

Discussion

28.	222Rn (half−life= 4 days)→B Starting with one mol of A in a closed vessel at S.T.P, if the volume of helium gas collected after 8 days is 33.6 L, then what is the mass number of B?
Answer» $^{222} R n (h a l f - l i f e = 4 d a y s) \to B$ Starting with one mol of A in a closed vessel at S.T.P, if the volume of helium gas collected after 8 days is 33.6 L, then what is the mass number of B?

Discussion

29.	23. 2.4g of a metal forms 5.6g of its oxides.The equivalent weight of metal is
Answer» 23. 2.4g of a metal forms 5.6g of its oxides.The equivalent weight of metal is

Discussion

30.	A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s2, the frictional force acting on the block in newtons is: (take g=10 ms−2)
Answer» A block of mass $1 kg$ lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is $0.6$ . If the acceleration of the truck is $5 {m/s}^{2}$ , the frictional force acting on the block in newtons is: (take $g = 10 {ms}^{- 2}$ )

Discussion

31.	Speaking theoretically, the force of attraction should increase while going deep inside into the earth's surface as the distance between the centre of the earth and the object decrease and we know that F is inversely proportional to r². But the case isnt the same, why?
Answer» Speaking theoretically, the force of attraction should increase while going deep inside into the earth's surface as the distance between the centre of the earth and the object decrease and we know that F is inversely proportional to r². But the case isnt the same, why?

Discussion

32.	If a car covers 2/5th of the total distance with v1 speed and 3/5th distance with v2 speed, then average speed of the car is
Answer» If a car covers $2 / 5^{t h}$ of the total distance with $v_{1}$ speed and $3 / 5^{t h}$ distance with $v_{2}$ speed, then average speed of the car is

Discussion

33.	Obtain an expression for the kinetic energy of oscillation and potential energy of a body performing a simple harmonic motion. Show that the total energy of a particle executing simple harmonic motion is proportional to the square of the amplitude and frequency of vibration.
Answer» Obtain an expression for the kinetic energy of oscillation and potential energy of a body performing a simple harmonic motion. Show that the total energy of a particle executing simple harmonic motion is proportional to the square of the amplitude and frequency of vibration.

Discussion

34.	an object is dropped from the top of the tower.It travels distance 5m is first second and 25 m in last second. The speed with which object strikes the ground is
Answer» an object is dropped from the top of the tower.It travels distance 5m is first second and 25 m in last second. The speed with which object strikes the ground is

Discussion

35.	If at t=0, switch S is closed, at steady state find heat generated (H) in the given circuit having a battery of 16 volts.
Answer» If at $t = 0$ , switch $S$ is closed, at steady state find heat generated $(H)$ in the given circuit having a battery of $16 volts$ .

Discussion

36.	If the ratio of the concentration of electron to that of holes in a semiconductor is 75 and the ratio of currents is 74, then what is the ratio of their drift velocities-
Answer» If the ratio of the concentration of electron to that of holes in a semiconductor is $\frac{7}{5}$ and the ratio of currents is $\frac{7}{4}$ , then what is the ratio of their drift velocities-

Discussion

37.	If →a,→b,→c are unit vectors, then \|→a−2→b\|2+\|→b−2→c\|2+\|→c−2→a\|2 does not exceed ?
Answer» If $\to a, \to b, \to c$ are unit vectors, then $\| \to a - 2 \to b \|^{2} + \| \to b - 2 \to c \|^{2} + \| \to c - 2 \to a \|^{2}$ does not exceed ?

Discussion

38.	A bullet of mass 20 g moving with a speed of 20 m/s hits on ice block of mass 990 g kept on a frictionless floor and gets stuck in it. How much ice will melt if 50% of the lost KE goes to ice?(initial temperature of the ice block and bullet =0 ∘C and the latent heat of fusion of ice is, L=336000 J/kg)
Answer» A bullet of mass $20 g$ moving with a speed of $20 m/s$ hits on ice block of mass $990 g$ kept on a frictionless floor and gets stuck in it. How much ice will melt if $50 %$ of the lost $KE$ goes to ice? (initial temperature of the ice block and bullet $= 0^{\circ} C$ and the latent heat of fusion of ice is, $L = 336000 J/kg)$

Discussion

39.	There is a destructive interference between the two waves of wavelength l coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by [MP PET 1985]
Answer» There is a destructive interference between the two waves of wavelength l coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by [MP PET 1985]

39.

There is a destructive interference between the two waves of wavelength l coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by [MP PET 1985]

Answer»

There is a destructive interference between the two waves of wavelength l coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by

[MP PET 1985]

Discussion

40.	The electric field at 20 cm from the centre of a uniformly charged non conducting sphere of radius 10 cm is E. Then at a dis†an ce 5 cm from the centre it will be (1) 16E (2)4E (3) 2E (4) Zero
Answer» The electric field at 20 cm from the centre of a uniformly charged non conducting sphere of radius 10 cm is E. Then at a dis†an ce 5 cm from the centre it will be (1) 16E (2)4E (3) 2E (4) Zero

Discussion

41.	Heat is supplied to an ideal monoatomic gas A so that it expands without changing its temperature. In another process, starting with the same state, heat is supplied at constant pressure. In both the cases, a graph of work done by the gas (W) is plotted versus heat added (Q) to the gas. The ratio of the slopes of the graphs obtained in the first and second processes is η1. The same ratio obtained for an ideal diatomic gas is η2 Find the ratio η1η2.
Answer» Heat is supplied to an ideal monoatomic gas $A$ so that it expands without changing its temperature. In another process, starting with the same state, heat is supplied at constant pressure. In both the cases, a graph of work done by the gas $(W)$ is plotted versus heat added $(Q)$ to the gas. The ratio of the slopes of the graphs obtained in the first and second processes is $η_{1}$ . The same ratio obtained for an ideal diatomic gas is $η_{2}$ Find the ratio $\frac{η_{1}}{η_{2}}$ .

Discussion

42.	three equal massesof 1.5kg each are fixed at the vertices of an equilateral triangle of side1m. what is the force acting on a particle of mass 1kg at its centroid
Answer» three equal massesof 1.5kg each are fixed at the vertices of an equilateral triangle of side1m. what is the force acting on a particle of mass 1kg at its centroid

Discussion

43.	A smooth uniform solid sphere rolling without slipping with velocity Vo collides elastically and head on
Answer» A smooth uniform solid sphere rolling without slipping with velocity Vo collides elastically and head on

Discussion

44.	An object weighs 10 N at the north pole of the earth. In a geostationary satellite distant 7R from the centre of the earth (of radius R), the true weight and the apparent weight are :-
Answer» An object weighs 10 N at the north pole of the earth. In a geostationary satellite distant 7R from the centre of the earth (of radius R), the true weight and the apparent weight are :-

Discussion

45.	The greatest height to which a man can throw a stone is h. The greatest distance to which he can throw it, will be
Answer» The greatest height to which a man can throw a stone is h. The greatest distance to which he can throw it, will be

Discussion

46.	I,f the total charge enclosed by a surface is zero does it imply that the electric field everywhere on the surface is zero? Conversely if the electric field everywhere on the surface is zero does it imply that the charge inside is zero? Explain.
Answer» I,f the total charge enclosed by a surface is zero does it imply that the electric field everywhere on the surface is zero? Conversely if the electric field everywhere on the surface is zero does it imply that the charge inside is zero? Explain.

Discussion

47.	A parallel plate capacitor with square plates is filled with four dielectrics of dielectric constants K1=2, K2=4, K3=6 and K4=8 arranged as shown in the figure. The effective dielectric constant will be
Answer» A parallel plate capacitor with square plates is filled with four dielectrics of dielectric constants $K_{1} = 2, K_{2} = 4, K_{3} = 6$ and $K_{4} = 8$ arranged as shown in the figure. The effective dielectric constant will be

Discussion

48.	In the displacement (d) - time (t) graph given below, the value of average velocity in the time interval 0 to 20 s is (in m/s)
Answer» In the displacement ( $d$ ) - time ( $t$ ) graph given below, the value of average velocity in the time interval $0$ to $20 s$ is (in $m/s$ )

Discussion

49.	Magnitude of magnetic field (in S.I Unit) at the centre of a hexagonal shape coil of side 10 cm, 50 turns and carrying a current I (Ampere ) in units of μ0Iπ is
Answer» Magnitude of magnetic field (in S.I Unit) at the centre of a hexagonal shape coil of side $10 cm$ , $50$ turns and carrying a current $I$ (Ampere ) in units of $\frac{μ_{0} I}{π}$ is

Discussion

50.	If the threshold frequency of a metal for photoelectric effect is v0, then which of the following will not happen?
Answer» If the threshold frequency of a metal for photoelectric effect is $v_{0}$ , then which of the following will not happen?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

ntIn a single slit diffraction of light of wavelengths by a slit of width e,the size of the central maximum on a screen at a distance b is?n

Three capacitors of capacitance 6μF each are available. The minimum and maximum capacitance which may be obtained are

A flat plate is moving normal to its plane through a gas under the action of a constant force F. The gas is kept at a very low pressure. The speed of the plate v is much less than the average speed u of the gas molecules. Which of the following options is/are true?

Explain why, a runner presses the ground with his feet before he starts his run.

27 drops of the same size are charged to 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

A point dipole (P) is placed at origin, potential at point A is V volts, then potential at point B is

Displacement of a body is varying according to the equation s = t 2 + t 3 , find its velocity at t= 5s

200 MeV of energy may be obtained per atom, in the nuclear fission reaction of U235. A nuclear reactor is generating a constant power of 1000 kW. The number of atoms undergoing fission per second is,

71. An iron cube is drawn into a uniform wire of length L.The elongation produced in this wire by a constant force F is proportinal to ?

A mobile phone gets fully charged in 3 hours and, when kept idle, it drains 1% of the battery every 9 minutes. If the completely discharged mobile phone is charged for 2.25 hours and then unplugged and kept idle for 3 hours, what would be the remaining charge in the phone's battery?

How many significant figures are present in the number 8300.00?

A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately​ be:

Why torque is maximum at 90 degrees ?

Two blocks A and B of masses 10 kg and 5 kg respectively are connected through an inextensible string, as shown in the figure. A force of magnitude 10 N is applied on block A in horizontal direction. The acceleration of block B at this instant will be (all surfaces are smooth and g = 10 m/s2)

Q)If a body starting from the rest travels with a uniform acceleration of 10 ms–2 for first 10 second and with uniform acceleration 5 ms–2 for next 20 seconds, then average acceleration of the body for 30 s is

A double convex lens of focal length 40 cm is bisected vertically. Is there any change in the focal length and power of the lens?

If →A=9^i−7^j+5^k and →B=3^i−2^j−6^k, then the value of (→A+→B)⋅(→A−→B) is

If the wavelength associated with a proton is 2.5×10−13 m, then determine the voltage through which it is accelerated.

In a young's double slit experiment λ=500 nm , d = 1.0 mm and D = 1.0 m. Find the minimum distance frm the central maximum fro which the intensity is half of the maximum intensity.

A pulley-block system as shown in the figure is released from rest. What is the magnitude of acceleration of COM of pulley-block system? (Take g=10 m/s2)

A bar magnet of length l and magnetic dipole moment M is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

A beam of light is incident on an equilateral glass prism at an angle of 45o and emerges out an angle of 35o. Calculate the angle of deviation of the light beam.

A 3 kg block is pulled by a force which is inclined at 37∘ to the horizontal table. The friction coefficient between the table and block is 1/3. For what minimum value of this force, will the block start sliding?

222Rn (half−life= 4 days)→B Starting with one mol of A in a closed vessel at S.T.P, if the volume of helium gas collected after 8 days is 33.6 L, then what is the mass number of B?

23. 2.4g of a metal forms 5.6g of its oxides.The equivalent weight of metal is

A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s2, the frictional force acting on the block in newtons is: (take g=10 ms−2)

Speaking theoretically, the force of attraction should increase while going deep inside into the earth's surface as the distance between the centre of the earth and the object decrease and we know that F is inversely proportional to r². But the case isnt the same, why?

If a car covers 2/5th of the total distance with v1 speed and 3/5th distance with v2 speed, then average speed of the car is

Obtain an expression for the kinetic energy of oscillation and potential energy of a body performing a simple harmonic motion. Show that the total energy of a particle executing simple harmonic motion is proportional to the square of the amplitude and frequency of vibration.

an object is dropped from the top of the tower.It travels distance 5m is first second and 25 m in last second. The speed with which object strikes the ground is

If at t=0, switch S is closed, at steady state find heat generated (H) in the given circuit having a battery of 16 volts.

If the ratio of the concentration of electron to that of holes in a semiconductor is 75 and the ratio of currents is 74, then what is the ratio of their drift velocities-

If →a,→b,→c are unit vectors, then |→a−2→b|2+|→b−2→c|2+|→c−2→a|2 does not exceed ?

There is a destructive interference between the two waves of wavelength l coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by [MP PET 1985]

The electric field at 20 cm from the centre of a uniformly charged non conducting sphere of radius 10 cm is E. Then at a dis†an ce 5 cm from the centre it will be (1) 16E (2)4E (3) 2E (4) Zero

three equal massesof 1.5kg each are fixed at the vertices of an equilateral triangle of side1m. what is the force acting on a particle of mass 1kg at its centroid

A smooth uniform solid sphere rolling without slipping with velocity Vo collides elastically and head on

An object weighs 10 N at the north pole of the earth. In a geostationary satellite distant 7R from the centre of the earth (of radius R), the true weight and the apparent weight are :-

The greatest height to which a man can throw a stone is h. The greatest distance to which he can throw it, will be

I,f the total charge enclosed by a surface is zero does it imply that the electric field everywhere on the surface is zero? Conversely if the electric field everywhere on the surface is zero does it imply that the charge inside is zero? Explain.

A parallel plate capacitor with square plates is filled with four dielectrics of dielectric constants K1=2, K2=4, K3=6 and K4=8 arranged as shown in the figure. The effective dielectric constant will be

In the displacement (d) - time (t) graph given below, the value of average velocity in the time interval 0 to 20 s is (in m/s)

Magnitude of magnetic field (in S.I Unit) at the centre of a hexagonal shape coil of side 10 cm, 50 turns and carrying a current I (Ampere ) in units of μ0Iπ is

If the threshold frequency of a metal for photoelectric effect is v0, then which of the following will not happen?

A geostationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface (Re = 6400 km) will approximately be: