50278 + Interview Questions in Physics

1.	∫2x+5√7−6x−x2dx=A√7−6x−x2+Bsin−1(x+34)+C (where C is a constant of integration), then the value of B−A is equal to
Answer» $\int \frac{2 x + 5}{\sqrt{7 - 6 x - x^{2}}} d x = A \sqrt{7 - 6 x - x^{2}} + B {sin}^{- 1} (\frac{x + 3}{4}) + C$ (where C is a constant of integration), then the value of $B - A$ is equal to

Discussion

2.	For the given uniformly charged ring, magnitude of the net electric field at point P is (in N/C)
Answer» For the given uniformly charged ring, magnitude of the net electric field at point $P$ is (in $N/C$ )

Discussion

3.	A totally reflecting mirror (small & plane) is illuminated normally by parallel beam of light. The mass of the mirror is 50 g. Find the power of the source need to support the weight of the mirror (Use g=10 ms−2)
Answer» A totally reflecting mirror (small $&$ plane) is illuminated normally by parallel beam of light. The mass of the mirror is $50 g .$ Find the power of the source need to support the weight of the mirror $(Use g = 10 {ms}^{- 2})$

Discussion

4.	36.A charge particle q is placed at the centre of o of cube side L (ABCDEFGH). Another same charge q is placed at a distance L from the centre o. Then what is the electric flux through the side ABCD? The picture is attached with it.
Answer» 36.A charge particle q is placed at the centre of o of cube side L (ABCDEFGH). Another same charge q is placed at a distance L from the centre o. Then what is the electric flux through the side ABCD? The picture is attached with it.

Discussion

5.	Which of the following represents the operation, 361 - 93?
Answer» Which of the following represents the operation, 361 - 93?

Discussion

6.	If the length of a second pendulum is increase by2%, then in a day the pendulum loses N × 10^2seconds. The value of N is
Answer» If the length of a second pendulum is increase by 2%, then in a day the pendulum loses N × 10^2 seconds. The value of N is

Discussion

7.	(a) Derive the formula: s = ut + 1/2 at2, where the symbols have usual meanings.
Answer» (a) Derive the formula: s = ut + 1/2 at², where the symbols have usual meanings.

Discussion

8.	The distance between an object and a divergent lens is x-times the focal length of the lens . The magnification m produced by the lens will be(1) x (2) x+1 (3) 1/x (4) 1/x+1
Answer» The distance between an object and a divergent lens is x-times the focal length of the lens . The magnification m produced by the lens will be (1) x (2) x+1 (3) 1/x (4) 1/x+1

Discussion

9.	Refractive index is maximum for
Answer» Refractive index is maximum for

Discussion

10.	what is meant by charges are created in pairs and destroyed in pairs?
Answer» what is meant by charges are created in pairs and destroyed in pairs?

Discussion

11.	A cubical block A of mass 10 kg and a block B of mass 2 kg are connected via string-pulley system as shown in the figure. If one end of the string is pulled with a force 20 N as shown, then the acceleration of wedge will be (All surfaces are smooth. Pulley and strings are ideal)
Answer» A cubical block A of mass 10 kg and a block B of mass 2 kg are connected via string-pulley system as shown in the figure. If one end of the string is pulled with a force 20 N as shown, then the acceleration of wedge will be (All surfaces are smooth. Pulley and strings are ideal)

Discussion

12.	85.2 to the power x = 3 to the power y=6 to the power z . then find the value of z
Answer» 85.2 to the power x = 3 to the power y=6 to the power z . then find the value of z

Discussion

13.	Where is the image formed in myopia?
Answer» Where is the image formed in myopia?

Discussion

14.	A lamina is made by removing a small disc of diameter 2R from a bigger disc of uniform mass density of radius 2R as shown in the figure. The moments of inertia of this lamina about an axis passing through O and P are I0 and IP respectively. Both these axes are perpendicular to the plane of the lamina. The ratio IPIO is
Answer» A lamina is made by removing a small disc of diameter $2 R$ from a bigger disc of uniform mass density of radius $2 R$ as shown in the figure. The moments of inertia of this lamina about an axis passing through $O$ and $P$ are $I_{0}$ and $I_{P}$ respectively. Both these axes are perpendicular to the plane of the lamina. The ratio $\frac{I_{P}}{I_{O}}$ is

Discussion

15.	Let →c be a unit vector which is coplanar with →a=^i−^j+2^k and →b=2^i−^j+^k such that →c is perpendicular to →a. If P be the length projection of →c along →b, then the value of 11P2 is
Answer» Let $\to c$ be a unit vector which is coplanar with $\to a =^i -^j + 2^k$ and $\to b = 2^i -^j +^k$ such that $\to c$ is perpendicular to $\to a$ . If $P$ be the length projection of $\to c$ along $\to b$ , then the value of $\frac{11}{P^{2}}$ is

Discussion

16.	A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body
Answer» A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body

16.

A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body

Answer»

A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body

Discussion

17.	A simple pendulum hanging from the ceiling of a stationary lift has a time period T1. When the lift moves downward with constant velocity, the time period is T2, then
Answer» A simple pendulum hanging from the ceiling of a stationary lift has a time period $T_{1}$ . When the lift moves downward with constant velocity, the time period is $T_{2}$ , then

Discussion

18.	The equation of standing wave in a stretched string is given by y=5 sin(pi x/3)cos(40pi t) where x and y are in cm and t in second the separation between two consecutive nodes is (in cm)
Answer» The equation of standing wave in a stretched string is given by y=5 sin(pi x/3)cos(40pi t) where x and y are in cm and t in second the separation between two consecutive nodes is (in cm)

Discussion

19.	A dual slope integrating type A/D converter has 2μF capacitor and 100kΩ resistor connected to it. If the reference voltage is taken as 7V and output voltage cannot exceed 15V, the time for which reference voltage will be integrated is
Answer» A dual slope integrating type $A / D$ converter has $2 μ F$ capacitor and $100 k Ω$ resistor connected to it. If the reference voltage is taken as $7 V$ and output voltage cannot exceed $15 V$ , the time for which reference voltage will be integrated is

Discussion

20.	A block of 4 kg is suspended from the ceiling through a massless spring of spring constant k=100 N/m. If 4 kg is replaced by 8 kg, what would be the ratio of elongation in 1st case to 2nd case?
Answer» A block of $4 k g$ is suspended from the ceiling through a massless spring of spring constant $k = 100 N / m$ . If $4 k g$ is replaced by $8 k g$ , what would be the ratio of elongation in 1st case to 2nd case?

Discussion

21.	Consider three sets A={1,2,3}, B={3,4,5,6}, C={6,7,8,9}. R is defined from A to B such that R1={(x,y): 4x
Answer» Consider three sets A={1,2,3}, B={3,4,5,6}, C={6,7,8,9}. R is defined from A to B such that R1={(x,y): 4x

Discussion

22.	A pulse (shown here) is reflected from the rigid wall A and then from free end B. The shape of the string after these 2 reflections will be -
Answer» A pulse (shown here) is reflected from the rigid wall $A$ and then from free end $B$ . The shape of the string after these $2$ reflections will be -

Discussion

23.	5.A ball falls freely from height of 45m. When the ball is at the height of 25m, it explodes into two equal peices, one of them moves horizontally with speed 10m/s. What is the distance between the two peices on the ground?
Answer» 5.A ball falls freely from height of 45m. When the ball is at the height of 25m, it explodes into two equal peices, one of them moves horizontally with speed 10m/s. What is the distance between the two peices on the ground?

Discussion

24.	If,find a unit vector parallel to the vector.
Answer» If, find a unit vector parallel to the vector.

Discussion

25.	For the MOSFET configuration given below it is given W/L = 2, VDD=2V,μnCox=100μA/V2 and VTh=0.5V. The mode of operation of MOSFET switches from saturation region to linear region when value VGS will be______ V. (Answer upto 2 decimal places)1.5
Answer» For the MOSFET configuration given below it is given W/L = 2, $V_{D D} = 2 V, μ_{n} C_{o x} = 100 μ A / V^{2}$ and $V_{T h} = 0.5 V$ . The mode of operation of MOSFET switches from saturation region to linear region when value $V_{G S}$ will be______ V. (Answer upto 2 decimal places) 1.5

Discussion

26.	If a particle is dropped from top of a tower, then ratio of times in falling first three successive equal { distances h is { (1) 1:2:3{ (2) 1:\sqrt2:\sqrt3{ (2) 1:\sqrt2:\sqrt3{ (3) 1:(\sqrt2-1):(\sqrt3-\sqrt2){ (4) 1:4:9
Answer» If a particle is dropped from top of a tower, then ratio of times in falling first three successive equal { distances h is { (1) 1:2:3{ (2) 1:\sqrt2:\sqrt3{ (2) 1:\sqrt2:\sqrt3{ (3) 1:(\sqrt2-1):(\sqrt3-\sqrt2){ (4) 1:4:9

Discussion

27.	A body of mass 5 kg is projected up an inclined plane at 30 degree with the horizontal with an initial velocity of 6 metre per second so the frictional force opposing its motion is4.5 Newton calculate the distance travelled by the body before coming to rest.
Answer» A body of mass 5 kg is projected up an inclined plane at 30 degree with the horizontal with an initial velocity of 6 metre per second so the frictional force opposing its motion is4.5 Newton calculate the distance travelled by the body before coming to rest.

Discussion

28.	In vectors cross product and dot product was not explained by Sir.Said that it will be explained later in some other chapter.Can you please mention the chapter pls as I have these topics included in my school exam
Answer» In vectors cross product and dot product was not explained by Sir.Said that it will be explained later in some other chapter.Can you please mention the chapter pls as I have these topics included in my school exam

Discussion

29.	A block of mass 4 kg is pressed against the wall by a force of 80 N as shown in figure. Determine the value of friction force and acceleration of block respectively. (Take coefficient of static friction 0.2, coefficient of kinetic friction 0.15)
Answer» A block of mass $4 k g$ is pressed against the wall by a force of $80 N$ as shown in figure. Determine the value of friction force and acceleration of block respectively. (Take coefficient of static friction $0.2$ , coefficient of kinetic friction $0.15$ )

Discussion

30.	A particle of mass M and charge q is thrown in a region where uniform gravitational field and electric field are present the path of the particle may be:
Answer» A particle of mass M and charge q is thrown in a region where uniform gravitational field and electric field are present the path of the particle may be:

Discussion

31.	Three forces each of magnitude F are applied along the edges of a regular hexagon as shown in the figure. Each side of hexagon is a. What is the resultant moment (torque) of these three forces about centre O?
Answer» Three forces each of magnitude $F$ are applied along the edges of a regular hexagon as shown in the figure. Each side of hexagon is $a$ . What is the resultant moment (torque) of these three forces about centre $O ?$

Discussion

32.	The input characteristics of a transistor in CE mode is the graph obtained by plotting
Answer» The input characteristics of a transistor in CE mode is the graph obtained by plotting

Discussion

33.	6.A capacitor of capacitance 5 micro farad is having initial charges of 10 micro coulomb and 20 micro coulomb on its two plates. Now it is connected to a source of 20V . Then final charges on their two plates of capacitor is ??
Answer» 6.A capacitor of capacitance 5 micro farad is having initial charges of 10 micro coulomb and 20 micro coulomb on its two plates. Now it is connected to a source of 20V . Then final charges on their two plates of capacitor is ??

Discussion

34.	Is magnetic force a conservativ or non-conservative force and why?
Answer» Is magnetic force a conservativ or non-conservative force and why?

Discussion

35.	In a Young’s double slit experiment, the fringes are displaced by a distance x when a glass plate of refractive index 1.5 is introduced in the path of one of the beams. When this plate is replaced by another plate of the same thickness, the shift of fringes is 3x/2. The refractive index of the second plate is
Answer» In a Young’s double slit experiment, the fringes are displaced by a distance x when a glass plate of refractive index $1.5$ is introduced in the path of one of the beams. When this plate is replaced by another plate of the same thickness, the shift of fringes is $3 x / 2$ . The refractive index of the second plate is

Discussion

36.	Two masses 5 g and 10 g are placed along x− axis as shown in the figure. Then, the distance of the COM of the two particle system from the 5 g mass is
Answer» Two masses $5 g$ and $10 g$ are placed along $x -$ axis as shown in the figure. Then, the distance of the $C O M$ of the two particle system from the $5 g$ mass is

Discussion

37.	The energy required to take a satellite to a height h above Earth surface (radius of Earth =6.4×103 km) is E1and kinetic energy required for the satellite to be in a circular orbit at this height is E2. The value of h for which E1 and E2 are equal is
Answer» The energy required to take a satellite to a height $h$ above Earth surface (radius of Earth $= 6.4 \times 10^{3} km$ ) is $E_{1}$ and kinetic energy required for the satellite to be in a circular orbit at this height is $E_{2}$ . The value of $h$ for which $E_{1}$ and $E_{2}$ are equal is

Discussion

38.	A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is
Answer» A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is

Discussion

39.	The open circuit test and the short circuit test were performed on the primary side of a 10 kVA, 2000/240 V, 50 Hz transformer and the following data were obtained OC test:VOC=240 V; IOC=0.6 A, POC=80 WSC test:VSC=112 V; ISC=5 A, PSC=160 WFind the approximate equivalent circuit referred to the primary side,
Answer» The open circuit test and the short circuit test were performed on the primary side of a 10 kVA, 2000/240 V, 50 Hz transformer and the following data were obtained $O C t e s t : V_{O C} = 240 V; I_{O C} = 0.6 A, P_{O C} = 80 W$ $S C t e s t : V_{S C} = 112 V; I_{S C} = 5 A, P_{S C} = 160 W$ Find the approximate equivalent circuit referred to the primary side,

Discussion

40.	A train is moving with velocity of 20m/s . On this dust is falling at the rate of 50kg/min. Find out the extra force required to move the train with constant velocity.
Answer» A train is moving with velocity of 20m/s . On this dust is falling at the rate of 50kg/min. Find out the extra force required to move the train with constant velocity.

Discussion

41.	Product formed during the following reaction is
Answer» Product formed during the following reaction is

Discussion

42.	The number of 5 digited numbers using 0, 1, 2, 3, 4 no digit being repeated in any number is
Answer» The number of 5 digited numbers using 0, 1, 2, 3, 4 no digit being repeated in any number is

Discussion

43.	Two charges 10 uC and -10 HC are placed at points A and B separated by a distance of 10cm .Find the field at a point P on the perpendicular bisector of AB at a distance of 12 cm from its middle poi
Answer» Two charges 10 uC and -10 HC are placed at points A and B separated by a distance of 10cm .Find the field at a point P on the perpendicular bisector of AB at a distance of 12 cm from its middle poi

Discussion

44.	The velocity time graph for two uniformly accelerated bodies a and b make angles 30° and 60° with the time axis.which body has less acceleration ?
Answer» The velocity time graph for two uniformly accelerated bodies a and b make angles 30° and 60° with the time axis.which body has less acceleration ?

Discussion

45.	If y=3x2+2x then dydx=?
Answer» If $y = 3 x^{2} + 2 x t h e n \frac{d y}{d x}$ =?

Discussion

46.	Velocity of a car as a function of time is given by v(t)=(3t3−sint) in m/s. The displacement in (m) of the car as a function of time t is [Take x=0 at t=0]
Answer» Velocity of a car as a function of time is given by $v (t) = (3 t^{3} - sin t)$ in $m/s$ . The displacement in $(m)$ of the car as a function of time $t$ is [Take $x = 0$ at $t = 0$ ]

Discussion

47.	A simple pendulum of length l is displaced by an angle a and released then work done by simple pendulum in complete vibration
Answer» A simple pendulum of length l is displaced by an angle a and released then work done by simple pendulum in complete vibration

Discussion

48.	The masses of 4 kg and 5 kg are connected by a string passing over a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is
Answer» The masses of $4 kg$ and $5 kg$ are connected by a string passing over a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of $5 kg$ mass is

Discussion

49.	A man bails out from an aeroplane and after dropping vertically through a distance of 40 m, he opens parachute and decelerates at 2m/s2. If he reaches ground with speed of 2 𝑚/𝑠, how much distance did he travel in air? (g=9.8 m/s2)
Answer» A man bails out from an aeroplane and after dropping vertically through a distance of 40 $m$ , he opens parachute and decelerates at 2 $m / s^{2} .$ If he reaches ground with speed of 2 𝑚/𝑠, how much distance did he travel in air? ( $g = 9.8 m / s^{2}$ )

Discussion

50.	13.An object is placed in front of a convex lens produces m times magnified and erect image. Where will the object be placed to obtain an inverted image of same magnification ?
Answer» 13.An object is placed in front of a convex lens produces m times magnified and erect image. Where will the object be placed to obtain an inverted image of same magnification ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

∫2x+5√7−6x−x2dx=A√7−6x−x2+Bsin−1(x+34)+C (where C is a constant of integration), then the value of B−A is equal to

For the given uniformly charged ring, magnitude of the net electric field at point P is (in N/C)

A totally reflecting mirror (small &amp; plane) is illuminated normally by parallel beam of light. The mass of the mirror is 50 g. Find the power of the source need to support the weight of the mirror (Use g=10 ms−2)

36.A charge particle q is placed at the centre of o of cube side L (ABCDEFGH). Another same charge q is placed at a distance L from the centre o. Then what is the electric flux through the side ABCD? The picture is attached with it.

Which of the following represents the operation, 361 - 93?

If the length of a second pendulum is increase by2%, then in a day the pendulum loses N × 10^2seconds. The value of N is

(a) Derive the formula: s = ut + 1/2 at2, where the symbols have usual meanings.

The distance between an object and a divergent lens is x-times the focal length of the lens . The magnification m produced by the lens will be(1) x (2) x+1 (3) 1/x (4) 1/x+1

Refractive index is maximum for

what is meant by charges are created in pairs and destroyed in pairs?

A cubical block A of mass 10 kg and a block B of mass 2 kg are connected via string-pulley system as shown in the figure. If one end of the string is pulled with a force 20 N as shown, then the acceleration of wedge will be (All surfaces are smooth. Pulley and strings are ideal)

85.2 to the power x = 3 to the power y=6 to the power z . then find the value of z

Where is the image formed in myopia?

Let →c be a unit vector which is coplanar with →a=^i−^j+2^k and →b=2^i−^j+^k such that →c is perpendicular to →a. If P be the length projection of →c along →b, then the value of 11P2 is

A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body

A simple pendulum hanging from the ceiling of a stationary lift has a time period T1. When the lift moves downward with constant velocity, the time period is T2, then

The equation of standing wave in a stretched string is given by y=5 sin(pi x/3)cos(40pi t) where x and y are in cm and t in second the separation between two consecutive nodes is (in cm)

A dual slope integrating type A/D converter has 2μF capacitor and 100kΩ resistor connected to it. If the reference voltage is taken as 7V and output voltage cannot exceed 15V, the time for which reference voltage will be integrated is

A block of 4 kg is suspended from the ceiling through a massless spring of spring constant k=100 N/m. If 4 kg is replaced by 8 kg, what would be the ratio of elongation in 1st case to 2nd case?

Consider three sets A={1,2,3}, B={3,4,5,6}, C={6,7,8,9}. R is defined from A to B such that R1={(x,y): 4x

A pulse (shown here) is reflected from the rigid wall A and then from free end B. The shape of the string after these 2 reflections will be -

5.A ball falls freely from height of 45m. When the ball is at the height of 25m, it explodes into two equal peices, one of them moves horizontally with speed 10m/s. What is the distance between the two peices on the ground?

If,find a unit vector parallel to the vector.

For the MOSFET configuration given below it is given W/L = 2, VDD=2V,μnCox=100μA/V2 and VTh=0.5V. The mode of operation of MOSFET switches from saturation region to linear region when value VGS will be______ V. (Answer upto 2 decimal places)1.5

If a particle is dropped from top of a tower, then ratio of times in falling first three successive equal { distances h is { (1) 1:2:3{ (2) 1:\sqrt2:\sqrt3{ (2) 1:\sqrt2:\sqrt3{ (3) 1:(\sqrt2-1):(\sqrt3-\sqrt2){ (4) 1:4:9

A body of mass 5 kg is projected up an inclined plane at 30 degree with the horizontal with an initial velocity of 6 metre per second so the frictional force opposing its motion is4.5 Newton calculate the distance travelled by the body before coming to rest.

In vectors cross product and dot product was not explained by Sir.Said that it will be explained later in some other chapter.Can you please mention the chapter pls as I have these topics included in my school exam

A block of mass 4 kg is pressed against the wall by a force of 80 N as shown in figure. Determine the value of friction force and acceleration of block respectively. (Take coefficient of static friction 0.2, coefficient of kinetic friction 0.15)

A particle of mass M and charge q is thrown in a region where uniform gravitational field and electric field are present the path of the particle may be:

Three forces each of magnitude F are applied along the edges of a regular hexagon as shown in the figure. Each side of hexagon is a. What is the resultant moment (torque) of these three forces about centre O?

The input characteristics of a transistor in CE mode is the graph obtained by plotting

6.A capacitor of capacitance 5 micro farad is having initial charges of 10 micro coulomb and 20 micro coulomb on its two plates. Now it is connected to a source of 20V . Then final charges on their two plates of capacitor is ??

Is magnetic force a conservativ or non-conservative force and why?

Two masses 5 g and 10 g are placed along x− axis as shown in the figure. Then, the distance of the COM of the two particle system from the 5 g mass is

The energy required to take a satellite to a height h above Earth surface (radius of Earth =6.4×103 km) is E1and kinetic energy required for the satellite to be in a circular orbit at this height is E2. The value of h for which E1 and E2 are equal is

A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is

A train is moving with velocity of 20m/s . On this dust is falling at the rate of 50kg/min. Find out the extra force required to move the train with constant velocity.

Product formed during the following reaction is

The number of 5 digited numbers using 0, 1, 2, 3, 4 no digit being repeated in any number is

Two charges 10 uC and -10 HC are placed at points A and B separated by a distance of 10cm .Find the field at a point P on the perpendicular bisector of AB at a distance of 12 cm from its middle poi

The velocity time graph for two uniformly accelerated bodies a and b make angles 30° and 60° with the time axis.which body has less acceleration ?

If y=3x2+2x then dydx=?

Velocity of a car as a function of time is given by v(t)=(3t3−sint) in m/s. The displacement in (m) of the car as a function of time t is [Take x=0 at t=0]

A simple pendulum of length l is displaced by an angle a and released then work done by simple pendulum in complete vibration

The masses of 4 kg and 5 kg are connected by a string passing over a frictionless pulley and are kept on a frictionless table as shown in the figure. The acceleration of 5 kg mass is

A man bails out from an aeroplane and after dropping vertically through a distance of 40 m, he opens parachute and decelerates at 2m/s2. If he reaches ground with speed of 2 𝑚/𝑠, how much distance did he travel in air? (g=9.8 m/s2)

13.An object is placed in front of a convex lens produces m times magnified and erect image. Where will the object be placed to obtain an inverted image of same magnification ?

A totally reflecting mirror (small & plane) is illuminated normally by parallel beam of light. The mass of the mirror is 50 g. Find the power of the source need to support the weight of the mirror (Use g=10 ms−2)