50278 + Interview Questions in Physics

1.	Two positive charge, q1 & q2 are moving parallely upward with speed respectively v1 & v2. Then prove magnetic force is greater than electric force .
Answer» Two positive charge, q1 & q2 are moving parallely upward with speed respectively v1 & v2. Then prove magnetic force is greater than electric force .

Discussion

2.	A two-port network shown below is excited by external dc sources. The voltages and currents are measured with voltmeters V1,V2 and ammeters A1,A2 (all assumed to be ideal) as indicated. under following switch conditions, the readings obtained are:(i)S1−open,S2−closed A1=0 A, V1=4.5 V, V2=1.5 V, A2=1 A(ii)S1−closed, S2−open A1=4 A, V1=6 V, V2=6V, A2=0 AThe h-parameter matrix for this network is
Answer» A two-port network shown below is excited by external dc sources. The voltages and currents are measured with voltmeters $V_{1}, V_{2}$ and ammeters $A_{1}, A_{2}$ (all assumed to be ideal) as indicated. under following switch conditions, the readings obtained are: $(i) S_{1} - o p e n, S_{2} - c l o s e d A_{1} = 0 A, V_{1} = 4.5 V, V_{2} = 1.5 V, A_{2} = 1 A$ $(i i) S_{1} - c l o s e d, S_{2} - o p e n A_{1} = 4 A, V_{1} = 6 V, V_{2} = 6 V, A_{2} = 0 A$ The h-parameter matrix for this network is

Discussion

3.	A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5×10−5 cm. The distance between the first secondary minima of the diffraction pattern, on either sides of central maxima is
Answer» A linear aperture whose width is $0.02 cm$ is placed immediately in front of a lens of focal length $60 cm$ . The aperture is illuminated normally by a parallel beam of wavelength $5 \times 10^{- 5} cm$ . The distance between the first secondary minima of the diffraction pattern, on either sides of central maxima is

Discussion

4.	A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speeds of sound is 343 m/s, the frequency of the honk as heard by him will be
Answer» A speeding motorcyclist sees traffic jam ahead of him. He slows down to $36 km/hour$ . He finds that traffic has eased and a car moving ahead of him at $18 km/hour$ is honking at a frequency of $1392 Hz$ . If the speeds of sound is $343 m/s$ , the frequency of the honk as heard by him will be

Discussion

5.	Consider the following two statements 1.Linear momentum of a system of particles is zero 2.Kinetic energy of a system of particles is zero Then
Answer» Consider the following two statements 1.Linear momentum of a system of particles is zero 2.Kinetic energy of a system of particles is zero Then

5.

Consider the following two statements 1.Linear momentum of a system of particles is zero 2.Kinetic energy of a system of particles is zero Then

Answer»

Consider the following two statements

1.Linear momentum of a system of particles is zero

2.Kinetic energy of a system of particles is zero

Then

Discussion

6.	A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform magnetic field \xrightarrow[{E }]{} . due to force q\xrightarrow[E]{} , its velocity increases from 0 to 6m/s in one second duration . At that ins†an t the direction of the field reversed . The car continues to move for two more second under the influence of this field . the average velocity and the average speed of the toy car between 0 to 3 second are respectively.
Answer» A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform magnetic field \xrightarrow[{E }]{} . due to force q\xrightarrow[E]{} , its velocity increases from 0 to 6m/s in one second duration . At that ins†an t the direction of the field reversed . The car continues to move for two more second under the influence of this field . the average velocity and the average speed of the toy car between 0 to 3 second are respectively.

Discussion

7.	An object is dropped from the window of a train moving horizontally with a uniform speed from a height 2.45 m above the ground. What is the time taken by the object to reach the ground?
Answer» An object is dropped from the window of a train moving horizontally with a uniform speed from a height 2.45 m above the ground. What is the time taken by the object to reach the ground?

Discussion

8.	An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is
Answer» An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

Discussion

9.	When a car driver travelling at a speed of 20 m/s applies the brakes and brings the car to rest in 4 sec, the acceleration of car will be :
Answer» When a car driver travelling at a speed of $20 m/s$ applies the brakes and brings the car to rest in $4 sec$ , the acceleration of car will be :

Discussion

10.	A network of resistors and voltage sources is shown in figure. Potential difference across point a and b is
Answer» A network of resistors and voltage sources is shown in figure. Potential difference across point a and b is

Discussion

11.	In which case can we can use the formula R=2A cosθ2 to calculate the magnitude of the resultant vector?
Answer» In which case can we can use the formula $R = 2 A c o s \frac{θ}{2}$ to calculate the magnitude of the resultant vector?

Discussion

12.	Two vectors →A and →B lie in a plane, another vector →C lies outside this plane, then the resultant of these three vectors i.e., →A+→B+→C
Answer» Two vectors $\to A$ and $\to B$ lie in a plane, another vector $\to C$ lies outside this plane, then the resultant of these three vectors i.e., $\to A + \to B + \to C$

Discussion

13.	A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let VA, VB, VC be the potentials at points A, B and C respectively. Then1. VC > VB 2. VB > VC 3. VA > VB 4. VA = VCIs this applicable for a conducting object of any shape e.g. A cylinder ( will the pot. at the two opp. ends be equal )
Answer» A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let VA, VB, VC be the potentials at points A, B and C respectively. Then 1. VC > VB 2. VB > VC 3. VA > VB 4. VA = VC Is this applicable for a conducting object of any shape e.g. A cylinder ( will the pot. at the two opp. ends be equal )

Discussion

14.	a light ray is incident normally on one of the refracting faces of a prism and just emerges out gazing the second surface. Then, the relation between angle of prism and its critical angle is
Answer» a light ray is incident normally on one of the refracting faces of a prism and just emerges out gazing the second surface. Then, the relation between angle of prism and its critical angle is

Discussion

15.	If →a,→b,→c are mutually perpendicular vectors of equal magnitudes, show that the vector →a+→b+→c is equally inclined to →a,→b and →c.
Answer» If $\to a, \to b, \to c$ are mutually perpendicular vectors of equal magnitudes, show that the vector $\to a + \to b + \to c$ is equally inclined to $\to a, \to b$ and $\to c$ .

Discussion

16.	Dear expert An object of actual mass m is moving with a velocity v,the velocity of object is measure with an accuracy of 50% calculate error in ,kinetic energy
Answer» Dear expert An object of actual mass m is moving with a velocity v,the velocity of object is measure with an accuracy of 50% calculate error in ,kinetic energy

Discussion

17.	A conductor with a positive charge
Answer» A conductor with a positive charge

Discussion

18.	A ball is thrown vertically upwards with speed 10 ms−1 from the top of a tower. It hits the ground after some time with a speed of 50 ms−1. The height of tower is (g=10 ms−2)
Answer» A ball is thrown vertically upwards with speed $10 {ms}^{- 1}$ from the top of a tower. It hits the ground after some time with a speed of $50 {ms}^{- 1}$ . The height of tower is $(g = 10 {ms}^{- 2})$

Discussion

19.	the potential energy of a particle of mass 100g moving along x axis is given by U=5x(x-4) where x is in meter. the period of oscillation is ?
Answer» the potential energy of a particle of mass 100g moving along x axis is given by U=5x(x-4) where x is in meter. the period of oscillation is ?

Discussion

20.	find out radius of curvature when velocity is perpendicular to initial direction of velocity
Answer» find out radius of curvature when velocity is perpendicular to initial direction of velocity

Discussion

21.	A boy swims in a 100 m long pool he covers 60 m with a velocity of 20 m/s and covers the rest of the distance with a velocity of 10 m\s. Calculate the average velocity of the boy?
Answer» A boy swims in a 100 m long pool he covers 60 m with a velocity of 20 m/s and covers the rest of the distance with a velocity of 10 m\s. Calculate the average velocity of the boy?

Discussion

22.	104.In the circuit shown in the figure, if potential at point A is taken to be zero, the potential at point B is ?
Answer» 104.In the circuit shown in the figure, if potential at point A is taken to be zero, the potential at point B is ?

Discussion

23.	Two identical metal plates shown photoelectric effect by a light of wavelength λA falls on plate A and λB on plate B(λA = 2λB). The maximum kinetic energy is
Answer» Two identical metal plates shown photoelectric effect by a light of wavelength λ_A falls on plate A and λ_B on plate B(λ_A = 2λ_B). The maximum kinetic energy is

23.

Two identical metal plates shown photoelectric effect by a light of wavelength λA falls on plate A and λB on plate B(λA = 2λB). The maximum kinetic energy is

Answer»

Two identical metal plates shown photoelectric effect by a light of wavelength λ_A falls on plate A and λ_B on plate B(λ_A = 2λ_B). The maximum kinetic energy is

Discussion

24.	The far point of a myopic person is 150cm in front of the eye. Calculate the focal length of the lens requires to enable him to see distant objects clearly.
Answer» The far point of a myopic person is 150cm in front of the eye. Calculate the focal length of the lens requires to enable him to see distant objects clearly.

Discussion

25.	If stretching force F1 is applied on a vertical metal wire then it's length is L1 and if force F2 is applied on it then it's length becomes L2 . The real length of wire is
Answer» If stretching force F1 is applied on a vertical metal wire then it's length is L1 and if force F2 is applied on it then it's length becomes L2 . The real length of wire is

Discussion

26.	if a body is projected upward from certain height h with initial velocity u then its speed at the ground level is
Answer» if a body is projected upward from certain height h with initial velocity u then its speed at the ground level is

Discussion

27.	An electric dipole of moment →p=(^i−3^j+2^k)×10−29 Cm, is at the origin. The electric field due to this dipole at →r=+^i+3^j+5^k (note that →r⋅→p=0) is parallel to:
Answer» An electric dipole of moment $\to p = (^i - 3^j + 2^k) \times 10^{- 29} Cm$ , is at the origin. The electric field due to this dipole at $\to r = +^i + 3^j + 5^k$ (note that $\to r \cdot \to p = 0)$ is parallel to:

Discussion

28.	An infinitesimally small bar magnet of dipole moment M is pointing and moving with the speed v in the x−direction. A small closed circular conducting loop of radius a and negligible self - inductance lies in the yz-plane with its centre at x=0, and its axis coinciding with the x-axis. Find the induced current in the loop, if the resistance of the loop is R. Assume that the distance x of the magnet from the centre of the loop is much greater than a.
Answer» An infinitesimally small bar magnet of dipole moment $M$ is pointing and moving with the speed $v$ in the $x -$ direction. A small closed circular conducting loop of radius $a$ and negligible self - inductance lies in the $y z$ -plane with its centre at $x = 0$ , and its axis coinciding with the $x$ -axis. Find the induced current in the loop, if the resistance of the loop is $R$ . Assume that the distance $x$ of the magnet from the centre of the loop is much greater than $a$ .

Discussion

29.	Two particles of the same mass are projected from the ground with the same speed 10 m/s at an angle 37∘ and 53∘ with the horizontal respectively. Find the maximum height attained by their COM (in metres). Take (g=9.8 m/s2) and answer upto two decimal places.
Answer» Two particles of the same mass are projected from the ground with the same speed $10 m/s$ at an angle $37^{\circ}$ and $53^{\circ}$ with the horizontal respectively. Find the maximum height attained by their $C O M$ (in metres). Take $(g = 9.8 {m/s}^{2})$ and answer upto two decimal places.

Discussion

30.	for simple pendulum graph between tsquare and l is
Answer» for simple pendulum graph between tsquare and l is

Discussion

31.	A particle moves in a circle of radius 1.0 cm at a speed given be v=2.0t where v is in cm/s and t is in seconds. Find the magnitude of net acceleration at t=1 s.
Answer» A particle moves in a circle of radius $1.0 c m$ at a speed given be $v = 2.0 t$ where $v$ is in $c m / s$ and $t$ is in seconds. Find the magnitude of net acceleration at $t = 1 s$ .

Discussion

32.	In the following displacement (x) vs. time (t) graph, at which point is the object's speed increasing?
Answer» In the following displacement (x) vs. time (t) graph, at which point is the object's speed increasing?

32.

In the following displacement (x) vs. time (t) graph, at which point is the object's speed increasing?

Answer»

In the following displacement (x) vs. time (t) graph, at which point is the object's speed increasing?

Discussion

33.	31.Two block A and B placed on a plane surface as shown in attachment. The mass of block A is 100 kg and that of block B is 200 kg. Block A is tied to a stand and block B is pulled by a force F. If the coefficient of friction between the surface A and B is 0.2 and the coefficient of B and the plane is 0.3 then for the motion of B the minimum value of F will be A) 700 N B) 1050 N C) 900 N D) 1100N
Answer» 31.Two block A and B placed on a plane surface as shown in attachment. The mass of block A is 100 kg and that of block B is 200 kg. Block A is tied to a stand and block B is pulled by a force F. If the coefficient of friction between the surface A and B is 0.2 and the coefficient of B and the plane is 0.3 then for the motion of B the minimum value of F will be A) 700 N B) 1050 N C) 900 N D) 1100N

Discussion

34.	A steel bar of 10×50 mm is cantilevered with two M12 bolts (P and Q) to support a static load of 4 kN as shown in the figure.The resultant shear stress on bolt P is closest to :
Answer» A steel bar of $10 \times 50 m m$ is cantilevered with two $M 12$ bolts (P and Q) to support a static load of $4 k N$ as shown in the figure. The resultant shear stress on bolt $P$ is closest to :

Discussion

35.	The sinusoidal signal is passed through a square law device defined by the input output relation y(t)=x2(t). The DC component in the signal x(t)=4cos(200t+π/6) is______.8
Answer» The sinusoidal signal is passed through a square law device defined by the input output relation $y (t) = x^{2} (t)$ . The DC component in the signal $x (t) = 4 c o s (200 t + π / 6)$ is______. 8

Discussion

36.	In the above problem, if the speed of m2 is 50 cm/s the distance covered by m1 in 0.4 s will be
Answer» In the above problem, if the speed of $m_{2}$ is 50 cm/s the distance covered by $m_{1}$ in 0.4 s will be

Discussion

37.	The density of ice is x gm/cm3 and that of water is y gm/cm3. When m gram of ice melts, then the change in volume is
Answer» The density of ice is $x g m / c m^{3}$ and that of water is $y g m / c m^{3}$ . When $m$ gram of ice melts, then the change in volume is

Discussion

38.	why is the rate of cooling of a sphere inversely proportional to the radius of the sphere
Answer» why is the rate of cooling of a sphere inversely proportional to the radius of the sphere

Discussion

39.	If in Bohr's atomic model, it is assumed that force between electron and proton varies inversely as r4, then the kinetic energy of the electron will be proportional to nγ, where γ is
Answer» If in Bohr's atomic model, it is assumed that force between electron and proton varies inversely as $r^{4}$ , then the kinetic energy of the electron will be proportional to $n^{γ}$ , where $γ$ is

Discussion

40.	A 10kg block slides without accelaration down a rough inclined plane making an angle of 20^° with the horizontal. Find the acceleration when the angle of inclination is increased to 30^°.(g=9.8m/s2)(†an20^°=0.364)? 5
Answer» A 10kg block slides without accelaration down a rough inclined plane making an angle of 20^° with the horizontal. Find the acceleration when the angle of inclination is increased to 30^°.(g=9.8m/s2)(†an20^°=0.364)? 5

Discussion

41.	An induc†an ce has a resis†an ce of 100 oham . When a.c.signal of frequency 1000Hz is appiled to the coil , the applied voltage leads the current by 45^†extdegree. calculate the self induc†an ce of the coil
Answer» An induc†an ce has a resis†an ce of 100 oham . When a.c.signal of frequency 1000Hz is appiled to the coil , the applied voltage leads the current by 45^†extdegree. calculate the self induc†an ce of the coil

Discussion

42.	A capacitor of capacity 6 μF and initial charge 160 μC in connected with key S and resistance as shown in figure. Point M is earthed. If key is closed at t=0, then the current through resistance (R=1 Ω) at (t=16 μs) is 4n3eA, then find n
Answer» A capacitor of capacity $6 μ F$ and initial charge $160 μ C$ in connected with key S and resistance as shown in figure. Point $M$ is earthed. If key is closed at $t = 0$ , then the current through resistance $(R = 1 Ω$ ) at $(t = 16 μ s)$ is $\frac{4 n}{3 e} A$ , then find $n$

Discussion

43.	Using photon picture of light, show how Einstein's photoelectric equation can be established. Write two features of photoelectric effect which cannot be explained by wave theory.
Answer» Using photon picture of light, show how Einstein's photoelectric equation can be established. Write two features of photoelectric effect which cannot be explained by wave theory.

Discussion

44.	Two concentric conducting shells have uniform charge distribution Q and 2Q. Electric potential at point P as shown in figure isदो संकेन्द्रीय चालक कोशों पर एकसमान आवेश वितरण Q व 2Q हैं। चित्र में दर्शाए गए बिन्दु P पर विद्युत विभव है
Answer» Two concentric conducting shells have uniform charge distribution Q and 2Q. Electric potential at point P as shown in figure is दो संकेन्द्रीय चालक कोशों पर एकसमान आवेश वितरण Q व 2Q हैं। चित्र में दर्शाए गए बिन्दु P पर विद्युत विभव है

Discussion

45.	A certain diatomic molecule AB has dipole moment 1.6 D and the internuclear dis†an ce is 100pm the percentage of electronic charge existing on more electronegative atom is
Answer» A certain diatomic molecule AB has dipole moment 1.6 D and the internuclear dis†an ce is 100pm the percentage of electronic charge existing on more electronegative atom is

Discussion

46.	Question 17Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
Answer» Question 17 Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

46.

Question 17Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

Answer»

Question 17

Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

Discussion

47.	Water is filled up to a height h in a beaker of radius R. The density of water is ρ, the surface tension of water is T and the atmospheric pressure is P0. Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of the section by water on the other side of this section has magnitude:
Answer» Water is filled up to a height h in a beaker of radius R. The density of water is $ρ$ , the surface tension of water is T and the atmospheric pressure is $P_{0}$ . Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of the section by water on the other side of this section has magnitude:

Discussion

48.	Why is the constant in the formula for calculating magnetic field intensity different for straight conductors and different for circular coil ? What is the derivation of the constant ?
Answer» Why is the constant in the formula for calculating magnetic field intensity different for straight conductors and different for circular coil ? What is the derivation of the constant ?

Discussion

49.	The velocity of sound in hydrogen at 0oC is 1200 m/s. When some amount of oxygen is mixed with hydrogen, the velocity decreases to 500 m/s. Determine the ratio of H2toO2 by volume in this mixture, given that the denstiy of oxygen is 16 times that of hydrogen
Answer» The velocity of sound in hydrogen at $0^{o} C$ is $1200 m/s$ . When some amount of oxygen is mixed with hydrogen, the velocity decreases to $500 m/s$ . Determine the ratio of $H_{2} t o O_{2}$ by volume in this mixture, given that the denstiy of oxygen is 16 times that of hydrogen

Discussion

50.	The charge on a parallel plate capacitor varies as q=q0cos(2πνt). The plates are very large and close to each other (area =A, separation =d). The displacement current through the capacitor is
Answer» The charge on a parallel plate capacitor varies as $q = q_{0} cos (2 π ν t)$ . The plates are very large and close to each other (area $= A$ , separation $= d$ ). The displacement current through the capacitor is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two positive charge, q1 & q2 are moving parallely upward with speed respectively v1 & v2. Then prove magnetic force is greater than electric force .

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speeds of sound is 343 m/s, the frequency of the honk as heard by him will be

Consider the following two statements 1.Linear momentum of a system of particles is zero 2.Kinetic energy of a system of particles is zero Then

An object is dropped from the window of a train moving horizontally with a uniform speed from a height 2.45 m above the ground. What is the time taken by the object to reach the ground?

An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

When a car driver travelling at a speed of 20 m/s applies the brakes and brings the car to rest in 4 sec, the acceleration of car will be :

A network of resistors and voltage sources is shown in figure. Potential difference across point a and b is

In which case can we can use the formula R=2A cosθ2 to calculate the magnitude of the resultant vector?

Two vectors →A and →B lie in a plane, another vector →C lies outside this plane, then the resultant of these three vectors i.e., →A+→B+→C

a light ray is incident normally on one of the refracting faces of a prism and just emerges out gazing the second surface. Then, the relation between angle of prism and its critical angle is

If →a,→b,→c are mutually perpendicular vectors of equal magnitudes, show that the vector →a+→b+→c is equally inclined to →a,→b and →c.

Dear expert An object of actual mass m is moving with a velocity v,the velocity of object is measure with an accuracy of 50% calculate error in ,kinetic energy

A conductor with a positive charge

A ball is thrown vertically upwards with speed 10 ms−1 from the top of a tower. It hits the ground after some time with a speed of 50 ms−1. The height of tower is (g=10 ms−2)

the potential energy of a particle of mass 100g moving along x axis is given by U=5x(x-4) where x is in meter. the period of oscillation is ?

find out radius of curvature when velocity is perpendicular to initial direction of velocity

A boy swims in a 100 m long pool he covers 60 m with a velocity of 20 m/s and covers the rest of the distance with a velocity of 10 m\s. Calculate the average velocity of the boy?

104.In the circuit shown in the figure, if potential at point A is taken to be zero, the potential at point B is ?

Two identical metal plates shown photoelectric effect by a light of wavelength λA falls on plate A and λB on plate B(λA = 2λB). The maximum kinetic energy is

The far point of a myopic person is 150cm in front of the eye. Calculate the focal length of the lens requires to enable him to see distant objects clearly.

If stretching force F1 is applied on a vertical metal wire then it's length is L1 and if force F2 is applied on it then it's length becomes L2 . The real length of wire is

if a body is projected upward from certain height h with initial velocity u then its speed at the ground level is

An electric dipole of moment →p=(^i−3^j+2^k)×10−29 Cm, is at the origin. The electric field due to this dipole at →r=+^i+3^j+5^k (note that →r⋅→p=0) is parallel to:

Two particles of the same mass are projected from the ground with the same speed 10 m/s at an angle 37∘ and 53∘ with the horizontal respectively. Find the maximum height attained by their COM (in metres). Take (g=9.8 m/s2) and answer upto two decimal places.

for simple pendulum graph between tsquare and l is

A particle moves in a circle of radius 1.0 cm at a speed given be v=2.0t where v is in cm/s and t is in seconds. Find the magnitude of net acceleration at t=1 s.

In the following displacement (x) vs. time (t) graph, at which point is the object's speed increasing?

A steel bar of 10×50 mm is cantilevered with two M12 bolts (P and Q) to support a static load of 4 kN as shown in the figure.The resultant shear stress on bolt P is closest to :

The sinusoidal signal is passed through a square law device defined by the input output relation y(t)=x2(t). The DC component in the signal x(t)=4cos(200t+π/6) is______.8

In the above problem, if the speed of m2 is 50 cm/s the distance covered by m1 in 0.4 s will be

The density of ice is x gm/cm3 and that of water is y gm/cm3. When m gram of ice melts, then the change in volume is

why is the rate of cooling of a sphere inversely proportional to the radius of the sphere

If in Bohr's atomic model, it is assumed that force between electron and proton varies inversely as r4, then the kinetic energy of the electron will be proportional to nγ, where γ is

A 10kg block slides without accelaration down a rough inclined plane making an angle of 20^° with the horizontal. Find the acceleration when the angle of inclination is increased to 30^°.(g=9.8m/s2)(†an20^°=0.364)? 5

An induc†an ce has a resis†an ce of 100 oham . When a.c.signal of frequency 1000Hz is appiled to the coil , the applied voltage leads the current by 45^†extdegree. calculate the self induc†an ce of the coil

A capacitor of capacity 6 μF and initial charge 160 μC in connected with key S and resistance as shown in figure. Point M is earthed. If key is closed at t=0, then the current through resistance (R=1 Ω) at (t=16 μs) is 4n3eA, then find n

Using photon picture of light, show how Einstein's photoelectric equation can be established. Write two features of photoelectric effect which cannot be explained by wave theory.

A certain diatomic molecule AB has dipole moment 1.6 D and the internuclear dis†an ce is 100pm the percentage of electronic charge existing on more electronegative atom is

Question 17Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

Why is the constant in the formula for calculating magnetic field intensity different for straight conductors and different for circular coil ? What is the derivation of the constant ?

The velocity of sound in hydrogen at 0oC is 1200 m/s. When some amount of oxygen is mixed with hydrogen, the velocity decreases to 500 m/s. Determine the ratio of H2toO2 by volume in this mixture, given that the denstiy of oxygen is 16 times that of hydrogen

The charge on a parallel plate capacitor varies as q=q0cos(2πνt). The plates are very large and close to each other (area =A, separation =d). The displacement current through the capacitor is