50278 + Interview Questions in Physics

1.	Is the magnetic field inside a toroid same at every of point irrespective of position?
Answer» Is the magnetic field inside a toroid same at every of point irrespective of position?

Discussion

2.	74. Ratio of amplitude of two coherent waves is 3:2 .Ratio of maximum intensity to the minium intensity of their interference pattern is. (1) 9:4 (2) 3:2 (3) 25:1 (4) 25:9
Answer» 74. Ratio of amplitude of two coherent waves is 3:2 .Ratio of maximum intensity to the minium intensity of their interference pattern is. (1) 9:4 (2) 3:2 (3) 25:1 (4) 25:9

Discussion

3.	ample 1.11 The electric field components in Fig. 1.27 areEr = ax1/2, Ey = Ez = 0, in which α = 800 N/C m1/2. Calculate (a) theflux through the cube, and (b) the charge within the cube. Assumethat a= 0.1 m.
Answer» ample 1.11 The electric field components in Fig. 1.27 areEr = ax1/2, Ey = Ez = 0, in which α = 800 N/C m1/2. Calculate (a) theflux through the cube, and (b) the charge within the cube. Assumethat a= 0.1 m.

Discussion

4.	The value of ∫√ln3√ln2xsinx2sinx2+sin(ln6−x2)dx is
Answer» The value of $\int_{\sqrt{ln 2}}^{\sqrt{ln 3}} \frac{x sin x^{2}}{sin x^{2} + sin (ln 6 - x^{2}) d x}$ is

Discussion

5.	In the shown figure, the acceleration of A is →aA=(15^i+15^j), then the acceleration of B is (A remains in contact with B)
Answer» In the shown figure, the acceleration of $A$ is ${\to a}_{A} = (15^i + 15^j)$ , then the acceleration of $B$ is ( $A$ remains in contact with $B$ )

Discussion

6.	In L-C oscillation if frequency of oscillation of chargeis f, then frequency of oscillation of magnetic energyis(2) 2f(1) ff(4) 4f(3)2
Answer» In L-C oscillation if frequency of oscillation of chargeis f, then frequency of oscillation of magnetic energyis(2) 2f(1) ff(4) 4f(3)2

Discussion

7.	A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r<R), then the correct option(s) is (are)
Answer» A spherical body of radius $R$ consists of a fluid of constant density and is in equilibrium under its own gravity. If $P (r)$ is the pressure at $r (r < R)$ , then the correct option(s) is (are)

Discussion

8.	The point charges }Q and }-2Q are placed at some distance apart. If the electric } field at the location of }Q is }E , the electric field at the location of }-2 Q will be: } a) }-3E/2 b) -E c) }-E/2 d) -2E
Answer» The point charges }Q and }-2Q are placed at some distance apart. If the electric } field at the location of }Q is }E , the electric field at the location of }-2 Q will be: } a) }-3E/2 b) -E c) }-E/2 d) -2E

Discussion

9.	What is mobile and immobile
Answer» What is mobile and immobile

Discussion

10.	A particle is moving along a circular path with uniform speed. Through what angle does its angular velocity changes when it completes half of the circular path?
Answer» A particle is moving along a circular path with uniform speed. Through what angle does its angular velocity changes when it completes half of the circular path?

Discussion

11.	50. The volume mass density of a solid sphere is g=(G�r)/R where r is distance from centre of sphere and a R is the radius and G is constant find gravitational field intensity at the surface of solid sphere
Answer» 50. The volume mass density of a solid sphere is g=(G�r)/R where r is distance from centre of sphere and a R is the radius and G is constant find gravitational field intensity at the surface of solid sphere

Discussion

12.	One mole of an ideal mono atomic gas undergo a thermodynamic cyclic process ABCDA as shown in internal energy U and densityρ graph. The corresponding pressure (P) versus volume (V) graph is
Answer» One mole of an ideal mono atomic gas undergo a thermodynamic cyclic process ABCDA as shown in internal energy $U$ and density $ρ$ graph. The corresponding pressure (P) versus volume (V) graph is

Discussion

13.	Stopping potential for photoelectrons ejected from a surface when light of wavelength 500 nm falls on it is 0.19 V. Now if light of wavelength 200 nm falls on same surface stopping potential will be (in volts) \(take hc=1250 eV nm) (Write up to two digits after the decimal point.)
Answer» Stopping potential for photoelectrons ejected from a surface when light of wavelength $500 n m$ falls on it is $0.19 V$ . Now if light of wavelength $200 n m$ falls on same surface stopping potential will be (in volts) \(take $h c = 1250 e V n m$ ) (Write up to two digits after the decimal point.)

Discussion

14.	Differentiate the following functions from first principles: log cosec x
Answer» Differentiate the following functions from first principles: log cosec x

Discussion

15.	Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has length 2l and diameter 2r. If the two wires are stretched by the same force, the elongation in A divided by elongation in B is
Answer» Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has length 2l and diameter 2r. If the two wires are stretched by the same force, the elongation in A divided by elongation in B is

Discussion

16.	A boy standing in a bus is thrown towards the rear of the bus as it begins to move, and to the front when it slows down. Why does this happen?
Answer» A boy standing in a bus is thrown towards the rear of the bus as it begins to move, and to the front when it slows down. Why does this happen?

Discussion

17.	For given shape of wave at time t=t0, velocity of particle at x=x0 is twice the wave velocity of given transverse wave. Find the slope of wave at x=x0.
Answer» For given shape of wave at time $t = t_{0}$ , velocity of particle at $x = x_{0}$ is twice the wave velocity of given transverse wave. Find the slope of wave at $x = x_{0}$ .

Discussion

18.	Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?
Answer» Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Discussion

19.	The reactance of a capacitor is 100 Ω, when it is connected to a 100 Hz AC supply. What will be its reactance, when it is connected to a 50 Hz AC supply?
Answer» The reactance of a capacitor is $100 Ω$ , when it is connected to a $100 Hz$ AC supply. What will be its reactance, when it is connected to a $50 Hz$ AC supply?

Discussion

20.	Four equal masses m each are placed at the corners of a square of length (l) as shown in the figure. The moment of inertia of the system about an axis passing through A and parallel to DB would be:
Answer» Four equal masses $m$ each are placed at the corners of a square of length $(l)$ as shown in the figure. The moment of inertia of the system about an axis passing through A and parallel to DB would be:

Discussion

21.	In the circuit shown, a four - wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is x=0.01 Ω/cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be
Answer» In the circuit shown, a four - wire potentiometer is made of a $400 cm$ long wire, which extends between $A$ and $B$ . The resistance per unit length of the potentiometer wire is $x = 0.01 Ω / cm$ . If an ideal voltmeter is connected as shown with jockey $J$ at $50 cm$ from end $A$ , the expected reading of the voltmeter will be

Discussion

22.	A 8-bit modulo 250 ripple counter uses JK flip-flops. If the propagation delay of each flip flop is 500 ns, the maximum clock frequency that can be used is equal to ______kHz.250
Answer» A 8-bit modulo 250 ripple counter uses JK flip-flops. If the propagation delay of each flip flop is 500 ns, the maximum clock frequency that can be used is equal to ______kHz. 250

Discussion

23.	On stretching a wire of Young's modulus Y having original length L by an amount l using a force F, the elastic energy stored per unit volume is
Answer» On stretching a wire of Young's modulus $Y$ having original length $L$ by an amount $l$ using a force $F$ , the elastic energy stored per unit volume is

Discussion

24.	51. A current flown in a conductor from east to west ,the direction of the magnetic field at a point above the conductor is toward north south east west
Answer» 51. A current flown in a conductor from east to west ,the direction of the magnetic field at a point above the conductor is toward north south east west

Discussion

25.	If n1,n2 and n3 are the fundamental frequencies of three segments of a string of length l, then the original fundamental frequency n of the string is given by
Answer» If $n_{1}, n_{2}$ and $n_{3}$ are the fundamental frequencies of three segments of a string of length $l$ , then the original fundamental frequency $n$ of the string is given by

Discussion

26.	A stone is thrown vertically upward on it's way , it passed A with a speed ‘v’ and passes point B 30 m higher than A with speed v/2 . Find the maximum height reached by the stone.
Answer» A stone is thrown vertically upward on it's way , it passed A with a speed ‘v’ and passes point B 30 m higher than A with speed v/2 . Find the maximum height reached by the stone.

Discussion

27.	In the circuit shown, key (K) is closed at t=0. Current through key at t=10−3 ln(2) is
Answer» In the circuit shown, key (K) is closed at $t = 0$ . Current through key at $t = 10^{- 3} l n (2)$ is

Discussion

28.	In the figure shown, what is the current (in Ampere) drawn from the battery? You are given:R1=15 Ω,R2=10 Ω,R3=20 Ω,R4=5 Ω,R5=25 Ω,R6=30 Ω,E=15 V
Answer» In the figure shown, what is the current (in $Ampere$ ) drawn from the battery? You are given: $R_{1} = 15 Ω, R_{2} = 10 Ω, R_{3} = 20 Ω, R_{4} = 5 Ω, R_{5} = 25 Ω, R_{6} = 30 Ω, E = 15 V$

Discussion

29.	A compoundmicroscope consists of an objective lens of focal length 2.0 cm andan eyepiece of focal length 6.25 cm separated by a distance of 15 cm.How far from the objective should an object be placed in order toobtain the final image at (a) the least distance of distinct vision(25 cm), and (b) at infinity? What is the magnifying power of themicroscope in each case?
Answer» A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order to obtain the final image at (a) the least distance of distinct vision (25 cm), and (b) at infinity? What is the magnifying power of the microscope in each case?

Discussion

30.	How to find electric field due to a uniformly charged ring at a distance x from its centre
Answer» How to find electric field due to a uniformly charged ring at a distance x from its centre

Discussion

31.	ntA charged particle moving with speed u in a circle of radius r. if B is magnetic field at centre, then charge on particle isn
Answer» ntA charged particle moving with speed u in a circle of radius r. if B is magnetic field at centre, then charge on particle isn

Discussion

32.	The electrostatics force between the metal plates of an isolated parallel plates capacitor C having a charge Q &area A,is {1} Independent of the distance between the plates. {2} linearly proportional to the distance between the plates. {3} Inversely proportional to the distance between the plates.{4} Proportional to the square root of the distance between the plates.
Answer» The electrostatics force between the metal plates of an isolated parallel plates capacitor C having a charge Q &area A,is {1} Independent of the distance between the plates. {2} linearly proportional to the distance between the plates. {3} Inversely proportional to the distance between the plates. {4} Proportional to the square root of the distance between the plates.

Discussion

33.	Calculate Reynolds number, if a fluid having viscosity of 0.5 Ns/m2 and density of 450 kg/m3, flows through a pipe of 20 mm diameter with an average velocity of 2.5 m/s.
Answer» Calculate Reynolds number, if a fluid having viscosity of $0.5 {Ns/m}^{2}$ and density of $450 {kg/m}^{3}$ , flows through a pipe of $20 mm$ diameter with an average velocity of $2.5 m/s$ .

Discussion

34.	40.The equations of displacement of two waves are given as y1= 10 sin(3πt + π/3) y2=5(sin 5πt+\sqrt{}3cos 5πt) Then what is the ratio of their amplitudes? 1). 1:2 2). 2:1 3). 1:1 4). None of the above.
Answer» 40.The equations of displacement of two waves are given as y1= 10 sin(3πt + π/3) y2=5(sin 5πt+\sqrt{}3cos 5πt) Then what is the ratio of their amplitudes? 1). 1:2 2). 2:1 3). 1:1 4). None of the above.

Discussion

35.	a1v1=a2v2=V. What is V here? If it is volume, how this relation is true?
Answer» a1v1=a2v2=V. What is V here? If it is volume, how this relation is true?

Discussion

36.	If u is instantaneous velocity of a particle and v is velocity of wave ,then 1)u is perpendicular to v 2)u is parallel to v 3)\|u\| is equal to \|v\| 4) \|u\| = (slope of wave form)\|v\|
Answer» If u is instantaneous velocity of a particle and v is velocity of wave ,then 1)u is perpendicular to v 2)u is parallel to v 3)\|u\| is equal to \|v\| 4) \|u\| = (slope of wave form)\|v\|

Discussion

37.	A unity feedback system has open loop poles (−2±j2) and 0. It has a single zero at (−4±j0). The angle of departure of the root locus branch starting from the poles (-2 -j2)is
Answer» A unity feedback system has open loop poles ( $- 2 \pm j 2$ ) and 0. It has a single zero at $(- 4 \pm j 0$ ). The angle of departure of the root locus branch starting from the poles (-2 -j2)is

Discussion

38.	Two putty balls of equal masses moving with equal speeds in mutually perpendicular direction, stick together after collision. If the balls were initially moving with a speed of 45√2 ms−1 each, the speed of their combined mass after collision is.
Answer» Two putty balls of equal masses moving with equal speeds in mutually perpendicular direction, stick together after collision. If the balls were initially moving with a speed of $45 \sqrt{2} m s^{- 1}$ each, the speed of their combined mass after collision is.

Discussion

39.	Assertion :- For an isolated system mechanical energy is conserved. Reason :- Kinetic frictional force is absent for isolated system
Answer» Assertion :- For an isolated system mechanical energy is conserved. Reason :- Kinetic frictional force is absent for isolated system

Discussion

40.	The number of silicon atoms per m3is 5 × 1028. This is dopedsimultaneously with 5 × 1022 atoms per m3of Arsenic and 5 × 1020per m3atoms of Indium. Calculate the number of electrons and holes.Given that ni= 1.5 × 1016 m–3. Is the material n-type or p-type?
Answer» The number of silicon atoms per m3is 5 × 1028. This is dopedsimultaneously with 5 × 1022 atoms per m3of Arsenic and 5 × 1020per m3atoms of Indium. Calculate the number of electrons and holes.Given that ni= 1.5 × 1016 m–3. Is the material n-type or p-type?

Discussion

41.	Low of conservation of mass
Answer» Low of conservation of mass

Discussion

42.	The radius of the orbital of electron in the hydrogen atom 0.5 A∘. The speed of the electron is. 2 × 106 ms. Then the current in the loop due to the motion of the electron is
Answer» The radius of the orbital of electron in the hydrogen atom 0.5 $A^{\circ}$ . The speed of the electron is. $2 \times 10^{6} \frac{m}{s}$ . Then the current in the loop due to the motion of the electron is

Discussion

43.	The following network is shown. The magnitude of voltage across points C-D in volts is
Answer» The following network is shown. The magnitude of voltage across points C-D in volts is

Discussion

44.	If the flow of water in the tank stops, what will be the depth of water in the tank. Assume that the level of oil outside the tank does not increase.
Answer» If the flow of water in the tank stops, what will be the depth of water in the tank. Assume that the level of oil outside the tank does not increase.

44.

If the flow of water in the tank stops, what will be the depth of water in the tank. Assume that the level of oil outside the tank does not increase.

Answer»

If the flow of water in the tank stops, what will be the depth of water in the tank. Assume that the level of oil outside the tank does not increase.

Discussion

45.	Burst the bubbles which give 10 as the answer.
Answer» Burst the bubbles which give 10 as the answer.

Discussion

46.	A particle has initial velocity →v=30^i+30√3^j (m/s) and acceleretion →a=−10^j (m/s2). The time t after which the angle between →v and →a will be 90∘ is
Answer» A particle has initial velocity $\to v = 30^i + 30 \sqrt{3}^j (m / s)$ and acceleretion $\to a = - 10^j (m / s^{2})$ . The time $t$ after which the angle between $\to v$ and $\to a$ will be $90^{\circ}$ is

Discussion

47.	When a certain weight is suspended from a long uniform wire(massless), its length increases by 1 cm. If the same weight is suspended from another wire(massless) of the same material and length but having a diameter half of the first one, the increase in length will be (in cm)
Answer» When a certain weight is suspended from a long uniform wire(massless), its length increases by $1 cm$ . If the same weight is suspended from another wire(massless) of the same material and length but having a diameter half of the first one, the increase in length will be (in $cm$ )

Discussion

48.	Two motorboats, which can move with velocities 4.0 m/s and 6.0 m/s relative to water are going up-stream. When the faster one overtakes the slower one, a buoy (floating device) is dropped from the slower one. After sometime both the boats turn back simultaneously and move at the same speeds relative to the water as before. Their engines are switched off when they reach the buoy again. If the maximum separation between the boats is 200 m after the buoy is dropped and water flow velocity is 1.5 m/s, find the distance( in metres) travelled by the buoy from the dropping point till the point where the boats meet the buoy again. ___
Answer» Two motorboats, which can move with velocities 4.0 m/s and 6.0 m/s relative to water are going up-stream. When the faster one overtakes the slower one, a buoy (floating device) is dropped from the slower one. After sometime both the boats turn back simultaneously and move at the same speeds relative to the water as before. Their engines are switched off when they reach the buoy again. If the maximum separation between the boats is 200 m after the buoy is dropped and water flow velocity is 1.5 m/s, find the distance( in metres) travelled by the buoy from the dropping point till the point where the boats meet the buoy again. ___

Discussion

49.	Two indentical blocks each of mass M=9 kg are placed on a rough horizontal surface of coefficient of static friction μ=0.1, assume static and kinetic coefficient of friction to be equal. The two blocks are joined by a light spring and block B is in contact with a vertical fixed wall as shown in figure. A bullet of mass m=1 kg and velocity Vo=10 m/s hit the block A and gets embedded in it.Find the maximum compression of spring (Take spring constant k=240 N/m and g=10 m/s2.
Answer» Two indentical blocks each of mass $M = 9 kg$ are placed on a rough horizontal surface of coefficient of static friction $μ = 0.1$ , assume static and kinetic coefficient of friction to be equal. The two blocks are joined by a light spring and block $B$ is in contact with a vertical fixed wall as shown in figure. A bullet of mass $m = 1 kg$ and velocity $V_{o} = 10 m/s$ hit the block $A$ and gets embedded in it. Find the maximum compression of spring (Take spring constant $k = 240 N/m$ and $g = 10 {m/s}^{2}$ .

Discussion

50.	The potential energy of a particle of mass 1 kg free to move along x-axis is given by U(x)=(x22−x) joule. If total mechanical energy of the particle is 2 J, then find the maximum speed of the particle. (Assuming that only conservative force is acting on the particle)
Answer» The potential energy of a particle of mass $1 kg$ free to move along x-axis is given by $U (x) = (\frac{x^{2}}{2} - x)$ joule. If total mechanical energy of the particle is $2 J$ , then find the maximum speed of the particle. (Assuming that only conservative force is acting on the particle)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Is the magnetic field inside a toroid same at every of point irrespective of position?

74. Ratio of amplitude of two coherent waves is 3:2 .Ratio of maximum intensity to the minium intensity of their interference pattern is. (1) 9:4 (2) 3:2 (3) 25:1 (4) 25:9

ample 1.11 The electric field components in Fig. 1.27 areEr = ax1/2, Ey = Ez = 0, in which α = 800 N/C m1/2. Calculate (a) theflux through the cube, and (b) the charge within the cube. Assumethat a= 0.1 m.

The value of ∫√ln3√ln2xsinx2sinx2+sin(ln6−x2)dx is

In the shown figure, the acceleration of A is →aA=(15^i+15^j), then the acceleration of B is (A remains in contact with B)

In L-C oscillation if frequency of oscillation of chargeis f, then frequency of oscillation of magnetic energyis(2) 2f(1) ff(4) 4f(3)2

A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r&lt;R), then the correct option(s) is (are)

The point charges }Q and }-2Q are placed at some distance apart. If the electric } field at the location of }Q is }E , the electric field at the location of }-2 Q will be: } a) }-3E/2 b) -E c) }-E/2 d) -2E

What is mobile and immobile

A particle is moving along a circular path with uniform speed. Through what angle does its angular velocity changes when it completes half of the circular path?

50. The volume mass density of a solid sphere is g=(G�r)/R where r is distance from centre of sphere and a R is the radius and G is constant find gravitational field intensity at the surface of solid sphere

One mole of an ideal mono atomic gas undergo a thermodynamic cyclic process ABCDA as shown in internal energy U and densityρ graph. The corresponding pressure (P) versus volume (V) graph is

Stopping potential for photoelectrons ejected from a surface when light of wavelength 500 nm falls on it is 0.19 V. Now if light of wavelength 200 nm falls on same surface stopping potential will be (in volts) \(take hc=1250 eV nm) (Write up to two digits after the decimal point.)

Differentiate the following functions from first principles: log cosec x

Two wires A and B are made of same material. The wire A has a length l and diameter r while the wire B has length 2l and diameter 2r. If the two wires are stretched by the same force, the elongation in A divided by elongation in B is

A boy standing in a bus is thrown towards the rear of the bus as it begins to move, and to the front when it slows down. Why does this happen?

For given shape of wave at time t=t0, velocity of particle at x=x0 is twice the wave velocity of given transverse wave. Find the slope of wave at x=x0.

Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

The reactance of a capacitor is 100 Ω, when it is connected to a 100 Hz AC supply. What will be its reactance, when it is connected to a 50 Hz AC supply?

Four equal masses m each are placed at the corners of a square of length (l) as shown in the figure. The moment of inertia of the system about an axis passing through A and parallel to DB would be:

A 8-bit modulo 250 ripple counter uses JK flip-flops. If the propagation delay of each flip flop is 500 ns, the maximum clock frequency that can be used is equal to ______kHz.250

On stretching a wire of Young's modulus Y having original length L by an amount l using a force F, the elastic energy stored per unit volume is

51. A current flown in a conductor from east to west ,the direction of the magnetic field at a point above the conductor is toward north south east west

If n1,n2 and n3 are the fundamental frequencies of three segments of a string of length l, then the original fundamental frequency n of the string is given by

A stone is thrown vertically upward on it's way , it passed A with a speed ‘v’ and passes point B 30 m higher than A with speed v/2 . Find the maximum height reached by the stone.

In the circuit shown, key (K) is closed at t=0. Current through key at t=10−3 ln(2) is

In the figure shown, what is the current (in Ampere) drawn from the battery? You are given:R1=15 Ω,R2=10 Ω,R3=20 Ω,R4=5 Ω,R5=25 Ω,R6=30 Ω,E=15 V

How to find electric field due to a uniformly charged ring at a distance x from its centre

ntA charged particle moving with speed u in a circle of radius r. if B is magnetic field at centre, then charge on particle isn

Calculate Reynolds number, if a fluid having viscosity of 0.5 Ns/m2 and density of 450 kg/m3, flows through a pipe of 20 mm diameter with an average velocity of 2.5 m/s.

40.The equations of displacement of two waves are given as y1= 10 sin(3πt + π/3) y2=5(sin 5πt+\sqrt{}3cos 5πt) Then what is the ratio of their amplitudes? 1). 1:2 2). 2:1 3). 1:1 4). None of the above.

a1v1=a2v2=V. What is V here? If it is volume, how this relation is true?

If u is instantaneous velocity of a particle and v is velocity of wave ,then 1)u is perpendicular to v 2)u is parallel to v 3)|u| is equal to |v| 4) |u| = (slope of wave form)|v|

A unity feedback system has open loop poles (−2±j2) and 0. It has a single zero at (−4±j0). The angle of departure of the root locus branch starting from the poles (-2 -j2)is

Two putty balls of equal masses moving with equal speeds in mutually perpendicular direction, stick together after collision. If the balls were initially moving with a speed of 45√2 ms−1 each, the speed of their combined mass after collision is.

Assertion :- For an isolated system mechanical energy is conserved. Reason :- Kinetic frictional force is absent for isolated system

The number of silicon atoms per m3is 5 × 1028. This is dopedsimultaneously with 5 × 1022 atoms per m3of Arsenic and 5 × 1020per m3atoms of Indium. Calculate the number of electrons and holes.Given that ni= 1.5 × 1016 m–3. Is the material n-type or p-type?

Low of conservation of mass

The radius of the orbital of electron in the hydrogen atom 0.5 A∘. The speed of the electron is. 2 × 106 ms. Then the current in the loop due to the motion of the electron is

The following network is shown. The magnitude of voltage across points C-D in volts is

If the flow of water in the tank stops, what will be the depth of water in the tank. Assume that the level of oil outside the tank does not increase.

Burst the bubbles which give 10 as the answer.

A particle has initial velocity →v=30^i+30√3^j (m/s) and acceleretion →a=−10^j (m/s2). The time t after which the angle between →v and →a will be 90∘ is

When a certain weight is suspended from a long uniform wire(massless), its length increases by 1 cm. If the same weight is suspended from another wire(massless) of the same material and length but having a diameter half of the first one, the increase in length will be (in cm)

The potential energy of a particle of mass 1 kg free to move along x-axis is given by U(x)=(x22−x) joule. If total mechanical energy of the particle is 2 J, then find the maximum speed of the particle. (Assuming that only conservative force is acting on the particle)

A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r<R), then the correct option(s) is (are)