50278 + Interview Questions in Physics

1.	77. What is the ratio of average molecular kinetic energy of UF6 to that of H2 both at 300k?
Answer» 77. What is the ratio of average molecular kinetic energy of UF6 to that of H2 both at 300k?

Discussion

2.	The angular velocity of a body changes from one revolution per 9 second to 1 revolution per second. The ratio of its radius of gyration in the two cases is(Assume that net torque applied is zero)
Answer» The angular velocity of a body changes from one revolution per $9$ second to $1$ revolution per second. The ratio of its radius of gyration in the two cases is (Assume that net torque applied is zero)

Discussion

3.	A body starts slipping down an incline and moves half meter in half second. How long will it take to move the next half meter?
Answer» A body starts slipping down an incline and moves half meter in half second. How long will it take to move the next half meter?

Discussion

4.	Charges of −2×10−10C,2×10−10 and 4×10−10C are placed at the corners A, B and D of a square ABCD of side 2m. Calculate the resultatnt field at the centre of the square.
Answer» Charges of $- 2 \times 10^{- 10} C, 2 \times 10^{- 10}$ and $4 \times 10^{- 10} C$ are placed at the corners A, B and D of a square ABCD of side 2m. Calculate the resultatnt field at the centre of the square.

Discussion

5.	An electric lamp designed for operation on 110 V C is connected to a 220 V AC supply, through a choke coil of inductance 2H, for proper operation. The angular frequency of the AC is 100√10rad/s . If a capacitor is to be used in the place of the choke coil, its capacitance must be
Answer» An electric lamp designed for operation on 110 V C is connected to a 220 V AC supply, through a choke coil of inductance 2H, for proper operation. The angular frequency of the AC is $100 \sqrt{10} r a d / s$ . If a capacitor is to be used in the place of the choke coil, its capacitance must be

Discussion

6.	a particle is moving in a straight line along x axis if acceleration of the particle is -2m/s2 then the speed of the particle is
Answer» a particle is moving in a straight line along x axis if acceleration of the particle is -2m/s2 then the speed of the particle is

Discussion

7.	A block of mass m, lying on a horizontal plane is acted upon by a horizontal force P and another force Q, inclined at an angle θ to the vertical. The block will remain in equilibrium if the coefficient of friction between it and the surface is (Assume P>Q)
Answer» A block of mass $m$ , lying on a horizontal plane is acted upon by a horizontal force $P$ and another force $Q$ , inclined at an angle $θ$ to the vertical. The block will remain in equilibrium if the coefficient of friction between it and the surface is (Assume $P > Q$ )

Discussion

8.	11. If electric field in a region is given bywhere E,-5x103 N/C, I = 2 cm.then electric flux passing through the plane x =2 cm. The plane is a square of side 2 cm.
Answer» 11. If electric field in a region is given bywhere E,-5x103 N/C, I = 2 cm.then electric flux passing through the plane x =2 cm. The plane is a square of side 2 cm.

Discussion

9.	In the HCl molecule, the separation between the nuclei of the two atoms is about 1.5 ∘A (1 ∘A=10−10 m). The approximate location of the centre of mass from the hydrogen atom assuming the chlorine atom to be about 35.5 times as massive as hydrogen is
Answer» In the $HCl$ molecule, the separation between the nuclei of the two atoms is about $1.5 \circ A (1 \circ A = 10^{- 10} m)$ . The approximate location of the centre of mass from the hydrogen atom assuming the chlorine atom to be about 35.5 times as massive as hydrogen is

Discussion

10.	Suppose a vertical tunnel is dug along the diameter of earth, assumed to be a sphere to be of uniform mass density ρ. If a body of mass m is thrown in this tunnel, then its acceleration at a distance y from the centre is given by
Answer» Suppose a vertical tunnel is dug along the diameter of earth, assumed to be a sphere to be of uniform mass density $ρ$ . If a body of mass $m$ is thrown in this tunnel, then its acceleration at a distance $y$ from the centre is given by

Discussion

11.	the e/m ratio for H^+
Answer» the e/m ratio for H^+

Discussion

12.	What is polarisation
Answer» What is polarisation

Discussion

13.	A proton is rotating along a circular path of radius 0.1 m under a centrifugal force of 4×10−13 N. If the mass of proton is 1.6×10−27 kg, the angular velocity of rotation is (in rad/s)
Answer» A proton is rotating along a circular path of radius $0.1 m$ under a centrifugal force of $4 \times 10^{- 13} N$ . If the mass of proton is $1.6 \times 10^{- 27} kg$ , the angular velocity of rotation is (in rad/s)

Discussion

14.	The maximum stiffness of an undamped isolator to provide 81 percent isolation for a 200 kg fan operating at 1000 rotation/min is
Answer» The maximum stiffness of an undamped isolator to provide 81 percent isolation for a 200 kg fan operating at 1000 rotation/min is

Discussion

15.	Consider the circuit shown in the figure below.The transistor is biased such that the value of gm=2mA/V, then the value of output resistance R0 is equal to...KΩ.[Assume value of λ=0.1 V−1]0.408
Answer» $C o n s i d e r t h e c i r c u i t s h o w n i n t h e f i g u r e b e l o w .$ $T h e t r a n s i s t o r i s b i a s e d s u c h t h a t t h e v a l u e o f g_{m} = 2 m A / V, t h e n t h e v a l u e o f o u t p u t r e s i s t a n c e R_{0} i s e q u a l t o . . . K Ω . [A s s u m e v a l u e o f λ = 0.1 V^{- 1}]$ 0.408

Discussion

16.	For the theory of equipartition of energy the energy associated with the each molecule is f/ 2 KT if the gas has n number of moles , now how we can convert the moles into molecules and the energy associated with total molecule is found to be n×na×f/2KT. Here na×K=R(gas constant) how? And total energy associated with total molecule is n ×R×T×f/2.
Answer» For the theory of equipartition of energy the energy associated with the each molecule is f/ 2 KT if the gas has n number of moles , now how we can convert the moles into molecules and the energy associated with total molecule is found to be n×na×f/2KT. Here na×K=R(gas constant) how? And total energy associated with total molecule is n ×R×T×f/2.

Discussion

17.	For a copper-constantan (type T) thermocouple, the junction potential E (in μV) at 0oC is given byE=42.58θ+5.6×10−2θ2+2.35×10−4θ3−2.1×10−6θ4+higher order terms. Assuming the cold junction compensation. The sensitivity of thermocouple at 100oC is ____ muV/oC
Answer» For a copper-constantan (type T) thermocouple, the junction potential $E ($ in $μ V)$ at $0^{o} C$ is given by $E = 42.58 θ + 5.6 \times 10^{- 2} θ^{2} + 2.35 \times 10^{- 4} θ^{3} - 2.1 \times 10^{- 6} θ^{4} + h i g h e r o r d e r t e r m s .$ Assuming the cold junction compensation. The sensitivity of thermocouple at $100^{o} C$ is ____ $m u V /^{o} C$

Discussion

18.	23.A particle executed SHM with an amplitude a.the period of osscilation is T .the minimum time taken by the particle to travel half of the amplitude from the equilibrium position is t/12 t/8 t/4 t/2
Answer» 23.A particle executed SHM with an amplitude a.the period of osscilation is T .the minimum time taken by the particle to travel half of the amplitude from the equilibrium position is t/12 t/8 t/4 t/2

Discussion

19.	A capillary tube of radius R is immersed in water and water rises in it to a height H. Mass of water in the capillary tube is M. If the radius of the tube is doubled, then the mass of water that rises in the capillary tube will be:
Answer» A capillary tube of radius $R$ is immersed in water and water rises in it to a height $H$ . Mass of water in the capillary tube is $M$ . If the radius of the tube is doubled, then the mass of water that rises in the capillary tube will be:

Discussion

20.	A disc is given velocity V and angular velocity ω [where V = 2Rω] on a surface with friction as shown in the figure. After what time will the friction on the disc become zero?
Answer» A disc is given velocity V and angular velocity $ω$ [where V = 2R $ω$ ] on a surface with friction as shown in the figure. After what time will the friction on the disc become zero?

Discussion

21.	While performing an experiment to determine the equivalent resistance of two resistors connected in parallel, a student observes the pointer of voltmeter at position X when the key is 'off' and the same pointer at position Y when the key is 'on'.The correct voltmeter reading is :(1) 0.2 V(2) 2 V(3) 2.2 V(4) 1.8 V
Answer» While performing an experiment to determine the equivalent resistance of two resistors connected in parallel, a student observes the pointer of voltmeter at position X when the key is 'off' and the same pointer at position Y when the key is 'on'. The correct voltmeter reading is : (1) 0.2 V (2) 2 V (3) 2.2 V (4) 1.8 V

Discussion

22.	An electron positron pair is produced by a gamma ray photon of energy 2.26 MeV. How much kinetic energy (expressed in MeV) is imparted to each of the two charged particles of the pair produced?
Answer» An electron positron pair is produced by a gamma ray photon of energy 2.26 MeV. How much kinetic energy (expressed in MeV) is imparted to each of the two charged particles of the pair produced?

Discussion

23.	If a charge q is placed at a centre of a cube of side 'a', then, what will be the electric flux associated with the cube?
Answer» If a charge q is placed at a centre of a cube of side 'a', then, what will be the electric flux associated with the cube?

Discussion

24.	ntA ball ls dropped on to the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 seconds, what is the average acceleration during contact?n nt(A) 1400 m/s2n nt(B) 2100 m/s2n nt(C) 700 m/s2n nt(D) 2800 m/s2n
Answer» ntA ball ls dropped on to the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 seconds, what is the average acceleration during contact?n nt(A) 1400 m/s2n nt(B) 2100 m/s2n nt(C) 700 m/s2n nt(D) 2800 m/s2n

Discussion

25.	a bullet of mass m passes through a pendulum of mass M with velocity v and come out of it with a velocity v /2 .the minimum value of v so that the bob complete it's one revolution in the vertical circle is ( l is length of pendulum )
Answer» a bullet of mass m passes through a pendulum of mass M with velocity v and come out of it with a velocity v /2 .the minimum value of v so that the bob complete it's one revolution in the vertical circle is ( l is length of pendulum )

Discussion

26.	19. A particle of mass 1 kg is moving among the liney x 2 with speed 2 m/s. The magnitude ofangular momentum of particle about origin is(1) 4 kg m2 s(2)4 2 kg m2 s(3) 2/2 kg m2(4) 2 kg m2 s-1
Answer» 19. A particle of mass 1 kg is moving among the liney x 2 with speed 2 m/s. The magnitude ofangular momentum of particle about origin is(1) 4 kg m2 s(2)4 2 kg m2 s(3) 2/2 kg m2(4) 2 kg m2 s-1

Discussion

27.	Let →a=^i+^j+√2^k,→b=b1^i+b2^j+√2^k and →c=5^i+^j+√2^k be three vectors such that the projection vector of →b on →a is →a and (→a+→b) is perpendicular to →c, then \|→b\| is equal to
Answer» Let $\to a =^i +^j + \sqrt{2}^k, \to b = b_{1}^i + b_{2}^j + \sqrt{2}^k$ and $\to c = 5^i +^j + \sqrt{2}^k$ be three vectors such that the projection vector of $\to b$ on $\to a$ is $\to a$ and $(\to a + \to b)$ is perpendicular to $\to c$ , then $\| \to b \|$ is equal to

Discussion

28.	The variation of potential energy (U) with position (x) of a system is shown in the figure. The conservative force acting on the system is best represented by
Answer» The variation of potential energy $(U)$ with position $(x)$ of a system is shown in the figure. The conservative force acting on the system is best represented by

Discussion

29.	43. Area of each plate =a.Find the equivalent capacitance
Answer» 43. Area of each plate =a.Find the equivalent capacitance

Discussion

30.	In circuit, initially capacitor and inductor does not have any energy. Then find current through the battery (in ampere) just after switch is closed
Answer» In circuit, initially capacitor and inductor does not have any energy. Then find current through the battery (in ampere) just after switch is closed

Discussion

31.	Q 13/15 A circular disc of mass 0.41 kg and radius10 m rolls without slipping with a velocity of 2 m/s.The total kinetic energy of disc is
Answer» Q 13/15 A circular disc of mass 0.41 kg and radius10 m rolls without slipping with a velocity of 2 m/s.The total kinetic energy of disc is

Discussion

32.	The average speed and velocity can be written in fraction form
Answer» The average speed and velocity can be written in fraction form

Discussion

33.	A body of mass m is lifted from the surface of earth to a height equal to R/3,where R is the radius of earth. Potential energy of the body increases by
Answer» A body of mass $m$ is lifted from the surface of earth to a height equal to $R / 3$ ,where $R$ is the radius of earth. Potential energy of the body increases by

Discussion

34.	Find the equivalent resistance of the network shown in figure between the points P and Q.
Answer» Find the equivalent resistance of the network shown in figure between the points P and Q.

Discussion

35.	The displacement x (in metre) of a particle in, simple harmonic motion is related to time t (in seconds) as x = 0.01 cos (πt+π4) The frequency of the motion will be
Answer» The displacement x (in metre) of a particle in, simple harmonic motion is related to time t (in seconds) as x = 0.01 cos $(π t + \frac{π}{4})$ The frequency of the motion will be

35.

The displacement x (in metre) of a particle in, simple harmonic motion is related to time t (in seconds) as x = 0.01 cos (πt+π4) The frequency of the motion will be

Answer»

The displacement x (in metre) of a particle in, simple harmonic motion is related to time t (in seconds) as

x = 0.01 cos $(π t + \frac{π}{4})$

The frequency of the motion will be

Discussion

36.	A capacitor of capacitance 1microF can withstand a maximum voltage 10V while a capacitor of capacitance 5microF can withstand the maximum voltage 20V if the two capacitors are connected in parallel then the two capacitors combination can take up the maximum voltage of1.10V2.20V3.30V4.20/3 V
Answer» A capacitor of capacitance 1microF can withstand a maximum voltage 10V while a capacitor of capacitance 5microF can withstand the maximum voltage 20V if the two capacitors are connected in parallel then the two capacitors combination can take up the maximum voltage of 1.10V 2.20V 3.30V 4.20/3 V

Discussion

37.	Explain why load bearing bars are generally made in I-section?
Answer» Explain why load bearing bars are generally made in I-section?

Discussion

38.	29.A cylindrical cavity is made along the length of a cylindrical current carrying wire as shown. I is the current inward perpendicular to the plane. Find magnetic field intensity at any point inside the cavity.
Answer» 29.A cylindrical cavity is made along the length of a cylindrical current carrying wire as shown. I is the current inward perpendicular to the plane. Find magnetic field intensity at any point inside the cavity.

Discussion

39.	What would be the maximum energy of an X-Ray if an electron is accelerated with a potential difference of 10kV. From this data find out the minimum wavelengths of the X-Ray. (Use hc = 1242 eV-nm)
Answer» What would be the maximum energy of an X-Ray if an electron is accelerated with a potential difference of 10kV. From this data find out the minimum wavelengths of the X-Ray. (Use hc = 1242 eV-nm)

Discussion

40.	The pressure at the bottom of a water tank is 6P, where P is the atmospheric pressure. If water is drawn out till the level decreases by 25th, then the pressure at the bottom of the tank is
Answer» The pressure at the bottom of a water tank is $6 P$ , where $P$ is the atmospheric pressure. If water is drawn out till the level decreases by $\frac{2}{5} t h$ , then the pressure at the bottom of the tank is

Discussion

41.	A man is walking at 2m/s towards South. To him, the wind appeares to blow from east. When he moves with double of the initial velocity, the direction of the wind appeares to be exactly from the South-East. Find the velocity of the wind and the direction of blowing.
Answer» A man is walking at 2m/s towards South. To him, the wind appeares to blow from east. When he moves with double of the initial velocity, the direction of the wind appeares to be exactly from the South-East. Find the velocity of the wind and the direction of blowing.

Discussion

42.	A bus start from rest and travel a distance s along a straight road. The coefficients of static and kinetic friction between the road and the tyre are mu-s and mu-k respectively. The minimum time of travel is proportional to
Answer» A bus start from rest and travel a distance s along a straight road. The coefficients of static and kinetic friction between the road and the tyre are mu-s and mu-k respectively. The minimum time of travel is proportional to

Discussion

43.	A boy of mass 4 kg is standing on a piece of wood having mass 5 kg. If the coefficient of friction between the wood and the floor is 0.5, the maximum force that the boy can exert on the rope so that the piece of wood does not move from its place is ______N.(Round off to the nearest integer)(g=10 ms−2)
Answer» A boy of mass $4 kg$ is standing on a piece of wood having mass $5 kg$ . If the coefficient of friction between the wood and the floor is $0.5$ , the maximum force that the boy can exert on the rope so that the piece of wood does not move from its place is ______ $N$ . $($ Round off to the nearest integer $)$ $(g = 10 {ms}^{- 2})$

Discussion

44.	A thin uniform rod of length l and mass m is uniformly charged with a total charge q. The rod is rotated about a point at a distance l/3 from midpoint of the rod. The magnitude of the magnetic moment of the rod,if the angular velocity is
Answer» A thin uniform rod of length l and mass m is uniformly charged with a total charge q. The rod is rotated about a point at a distance l/3 from midpoint of the rod. The magnitude of the magnetic moment of the rod,if the angular velocity is

Discussion

45.	A Zener diode having break-down voltage 5.6 V is connected in reverse bias with a battery of emf 10 V and a resistance of 100 Ω in series. The current flowing through the Zener is _____mA.
Answer» A Zener diode having break-down voltage $5.6 V$ is connected in reverse bias with a battery of emf $10 V$ and a resistance of $100 Ω$ in series. The current flowing through the Zener is _____ $mA$ .

Discussion

46.	IS AMPERE SCALAR OR VECTOR QUANTITY??
Answer» IS AMPERE SCALAR OR VECTOR QUANTITY??

Discussion

47.	State and prove Snell's law
Answer» State and prove Snell's law

Discussion

48.	The current in the winding of a toroid is 2.0 A. There are 950 turns and the mean circumferential length is 19π cm. If the magnetic field inside the toroid is 2 T, then the magnetic susceptibility of core is 111n. The value of n is
Answer» The current in the winding of a toroid is $2.0 A$ . There are $950$ turns and the mean circumferential length is $19 π cm$ . If the magnetic field inside the toroid is $2 T$ , then the magnetic susceptibility of core is $111 n$ . The value of $n$ is

Discussion

49.	______ mirror is called as diverging mirror
Answer» ______ mirror is called as diverging mirror

Discussion

50.	A particle of mass m and charge q moving with velocity v = qBI/2m enters region 2 to the boundary as shown in the figure. Region 2 has a uniform magnetic field B perpendicular to the plane of paper the particle will
Answer» A particle of mass m and charge q moving with velocity v = qBI/2m enters region 2 to the boundary as shown in the figure. Region 2 has a uniform magnetic field B perpendicular to the plane of paper the particle will

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

77. What is the ratio of average molecular kinetic energy of UF6 to that of H2 both at 300k?

The angular velocity of a body changes from one revolution per 9 second to 1 revolution per second. The ratio of its radius of gyration in the two cases is(Assume that net torque applied is zero)

A body starts slipping down an incline and moves half meter in half second. How long will it take to move the next half meter?

Charges of −2×10−10C,2×10−10 and 4×10−10C are placed at the corners A, B and D of a square ABCD of side 2m. Calculate the resultatnt field at the centre of the square.

An electric lamp designed for operation on 110 V C is connected to a 220 V AC supply, through a choke coil of inductance 2H, for proper operation. The angular frequency of the AC is 100√10rad/s . If a capacitor is to be used in the place of the choke coil, its capacitance must be

a particle is moving in a straight line along x axis if acceleration of the particle is -2m/s2 then the speed of the particle is

A block of mass m, lying on a horizontal plane is acted upon by a horizontal force P and another force Q, inclined at an angle θ to the vertical. The block will remain in equilibrium if the coefficient of friction between it and the surface is (Assume P&gt;Q)

11. If electric field in a region is given bywhere E,-5x103 N/C, I = 2 cm.then electric flux passing through the plane x =2 cm. The plane is a square of side 2 cm.

In the HCl molecule, the separation between the nuclei of the two atoms is about 1.5 ∘A (1 ∘A=10−10 m). The approximate location of the centre of mass from the hydrogen atom assuming the chlorine atom to be about 35.5 times as massive as hydrogen is

Suppose a vertical tunnel is dug along the diameter of earth, assumed to be a sphere to be of uniform mass density ρ. If a body of mass m is thrown in this tunnel, then its acceleration at a distance y from the centre is given by

the e/m ratio for H^+

What is polarisation

A proton is rotating along a circular path of radius 0.1 m under a centrifugal force of 4×10−13 N. If the mass of proton is 1.6×10−27 kg, the angular velocity of rotation is (in rad/s)

The maximum stiffness of an undamped isolator to provide 81 percent isolation for a 200 kg fan operating at 1000 rotation/min is

Consider the circuit shown in the figure below.The transistor is biased such that the value of gm=2mA/V, then the value of output resistance R0 is equal to...KΩ.[Assume value of λ=0.1 V−1]0.408

For a copper-constantan (type T) thermocouple, the junction potential E (in μV) at 0oC is given byE=42.58θ+5.6×10−2θ2+2.35×10−4θ3−2.1×10−6θ4+higher order terms. Assuming the cold junction compensation. The sensitivity of thermocouple at 100oC is ____ muV/oC

23.A particle executed SHM with an amplitude a.the period of osscilation is T .the minimum time taken by the particle to travel half of the amplitude from the equilibrium position is t/12 t/8 t/4 t/2

A capillary tube of radius R is immersed in water and water rises in it to a height H. Mass of water in the capillary tube is M. If the radius of the tube is doubled, then the mass of water that rises in the capillary tube will be:

A disc is given velocity V and angular velocity ω [where V = 2Rω] on a surface with friction as shown in the figure. After what time will the friction on the disc become zero?

An electron positron pair is produced by a gamma ray photon of energy 2.26 MeV. How much kinetic energy (expressed in MeV) is imparted to each of the two charged particles of the pair produced?

If a charge q is placed at a centre of a cube of side 'a', then, what will be the electric flux associated with the cube?

ntA ball ls dropped on to the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 seconds, what is the average acceleration during contact?n nt(A) 1400 m/s2n nt(B) 2100 m/s2n nt(C) 700 m/s2n nt(D) 2800 m/s2n

a bullet of mass m passes through a pendulum of mass M with velocity v and come out of it with a velocity v /2 .the minimum value of v so that the bob complete it's one revolution in the vertical circle is ( l is length of pendulum )

19. A particle of mass 1 kg is moving among the liney x 2 with speed 2 m/s. The magnitude ofangular momentum of particle about origin is(1) 4 kg m2 s(2)4 2 kg m2 s(3) 2/2 kg m2(4) 2 kg m2 s-1

Let →a=^i+^j+√2^k,→b=b1^i+b2^j+√2^k and →c=5^i+^j+√2^k be three vectors such that the projection vector of →b on →a is →a and (→a+→b) is perpendicular to →c, then |→b| is equal to

The variation of potential energy (U) with position (x) of a system is shown in the figure. The conservative force acting on the system is best represented by

43. Area of each plate =a.Find the equivalent capacitance

In circuit, initially capacitor and inductor does not have any energy. Then find current through the battery (in ampere) just after switch is closed

Q 13/15 A circular disc of mass 0.41 kg and radius10 m rolls without slipping with a velocity of 2 m/s.The total kinetic energy of disc is

The average speed and velocity can be written in fraction form

A body of mass m is lifted from the surface of earth to a height equal to R/3,where R is the radius of earth. Potential energy of the body increases by

Find the equivalent resistance of the network shown in figure between the points P and Q.

The displacement x (in metre) of a particle in, simple harmonic motion is related to time t (in seconds) as x = 0.01 cos (πt+π4) The frequency of the motion will be

A capacitor of capacitance 1microF can withstand a maximum voltage 10V while a capacitor of capacitance 5microF can withstand the maximum voltage 20V if the two capacitors are connected in parallel then the two capacitors combination can take up the maximum voltage of1.10V2.20V3.30V4.20/3 V

Explain why load bearing bars are generally made in I-section?

29.A cylindrical cavity is made along the length of a cylindrical current carrying wire as shown. I is the current inward perpendicular to the plane. Find magnetic field intensity at any point inside the cavity.

What would be the maximum energy of an X-Ray if an electron is accelerated with a potential difference of 10kV. From this data find out the minimum wavelengths of the X-Ray. (Use hc = 1242 eV-nm)

The pressure at the bottom of a water tank is 6P, where P is the atmospheric pressure. If water is drawn out till the level decreases by 25th, then the pressure at the bottom of the tank is

A man is walking at 2m/s towards South. To him, the wind appeares to blow from east. When he moves with double of the initial velocity, the direction of the wind appeares to be exactly from the South-East. Find the velocity of the wind and the direction of blowing.

A bus start from rest and travel a distance s along a straight road. The coefficients of static and kinetic friction between the road and the tyre are mu-s and mu-k respectively. The minimum time of travel is proportional to

A thin uniform rod of length l and mass m is uniformly charged with a total charge q. The rod is rotated about a point at a distance l/3 from midpoint of the rod. The magnitude of the magnetic moment of the rod,if the angular velocity is

A Zener diode having break-down voltage 5.6 V is connected in reverse bias with a battery of emf 10 V and a resistance of 100 Ω in series. The current flowing through the Zener is _____mA.

IS AMPERE SCALAR OR VECTOR QUANTITY??

State and prove Snell's law

The current in the winding of a toroid is 2.0 A. There are 950 turns and the mean circumferential length is 19π cm. If the magnetic field inside the toroid is 2 T, then the magnetic susceptibility of core is 111n. The value of n is

______ mirror is called as diverging mirror

A particle of mass m and charge q moving with velocity v = qBI/2m enters region 2 to the boundary as shown in the figure. Region 2 has a uniform magnetic field B perpendicular to the plane of paper the particle will

A block of mass m, lying on a horizontal plane is acted upon by a horizontal force P and another force Q, inclined at an angle θ to the vertical. The block will remain in equilibrium if the coefficient of friction between it and the surface is (Assume P>Q)