50278 + Interview Questions in Physics Page 21 InterviewSolution

1001.	A ball is projected from ground with a speed of 30 m/s , find θ so that ball passes through point A. (g=10 ms−2)
Answer» A ball is projected from ground with a speed of 30 m/s , find $θ$ so that ball passes through point A. $(g = 10 m s^{- 2})$

Discussion

1002.	The position x of a particle moving along x -axis is given by the equation t=x +2 , where x is in metres and tin seconds .find the work done by the force in first four seconds.
Answer» The position x of a particle moving along x -axis is given by the equation t=x +2 , where x is in metres and tin seconds .find the work done by the force in first four seconds.

Discussion

1003.	63.A sphere of radius R1is suspended within a hollow sphere of R2 (R2>R1) the Inner sphere is charged to a potential P when outer sphere is earth then find the charge on in.er sphere
Answer» 63.A sphere of radius R1is suspended within a hollow sphere of R2 (R2>R1) the Inner sphere is charged to a potential P when outer sphere is earth then find the charge on in.er sphere

Discussion

1004.	A ball is thrown from the ground to clear a wall 3 m high at a distance of 6 m and falls 18 m away from the wall, the angle of projection of ball with horizontal is
Answer» A ball is thrown from the ground to clear a wall $3 m$ high at a distance of $6 m$ and falls $18 m$ away from the wall, the angle of projection of ball with horizontal is

Discussion

1005.	Three rods of the same dimension have thermal conductivities 3K, 2K and K.They are arranged as shown in fig. Given below, with their ends at 100∘ C, 50∘ C and 20∘ C. The temperature of their junction is
Answer» Three rods of the same dimension have thermal conductivities 3K, 2K and K.They are arranged as shown in fig. Given below, with their ends at $100^{\circ}$ C, $50^{\circ}$ C and $20^{\circ}$ C. The temperature of their junction is

1005.

Three rods of the same dimension have thermal conductivities 3K, 2K and K.They are arranged as shown in fig. Given below, with their ends at 100∘ C, 50∘ C and 20∘ C. The temperature of their junction is

Answer»

Three rods of the same dimension have thermal conductivities 3K, 2K and K.They are arranged as shown in fig. Given below, with their ends at $100^{\circ}$ C, $50^{\circ}$ C and $20^{\circ}$ C. The temperature of their junction is

Discussion

1006.	The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K, the root mean square speed of the gas molecules is v then at 480 K it will be
Answer» The temperature of an ideal gas is increased from $120 K$ to $480 K$ . If at $120 K$ , the root mean square speed of the gas molecules is v then at $480 K$ it will be

Discussion

1007.	A body travels half ofits total path in the last second of its free fall from rest.The duration of fall is nearly (a)3.4sec (b)4.5sec (c)5sec (d)5.5sec
Answer» A body travels half ofits total path in the last second of its free fall from rest.The duration of fall is nearly (a)3.4sec (b)4.5sec (c)5sec (d)5.5sec

Discussion

1008.	Two batteries one of the emf 3 V, internal resistance 1 ohm and the other of emf 15 V, internal resistance 2 ohm are connected in series with a resistance R as shown. If the potential difference between a and b is zero, the resistance of R in ohm is
Answer» Two batteries one of the emf $3 V$ , internal resistance $1 ohm$ and the other of emf $15 V$ , internal resistance $2 ohm$ are connected in series with a resistance $R$ as shown. If the potential difference between a and b is zero, the resistance of $R$ in ohm is

Discussion

1009.	Consider an YDSE that has different slit widths, as a result, amplitude of waves from two slits are A and 2A, respectively. If I0 be the maximum intensity of the interference pattern, then intensity of the pattern for phase difference ϕ is
Answer» Consider an YDSE that has different slit widths, as a result, amplitude of waves from two slits are $A$ and $2 A$ , respectively. If $I_{0}$ be the maximum intensity of the interference pattern, then intensity of the pattern for phase difference $ϕ$ is

Discussion

1010.	If an electron enters into a space between the plates of a parallel plate capacitor at an angle α with the plates and leaves at an angle β to the plates. The ratio of its kinetic energy while entering the capacitor to that while leaving will be
Answer» If an electron enters into a space between the plates of a parallel plate capacitor at an angle $α$ with the plates and leaves at an angle $β$ to the plates. The ratio of its kinetic energy while entering the capacitor to that while leaving will be

Discussion

1011.	A particle executing SHM completes 1200 oscillations per minute and passes the mean position with a velocity of 3.14 m/s.to find the maximum displacement of a particle from the mean position .also obtain the displacement equation of the particle if its displacement is zero at instant t=0.
Answer» A particle executing SHM completes 1200 oscillations per minute and passes the mean position with a velocity of 3.14 m/s.to find the maximum displacement of a particle from the mean position .also obtain the displacement equation of the particle if its displacement is zero at instant t=0.

Discussion

1012.	The electric field at 20 cm from the centre of a uniformly charged sphere of radius 10 cm is E. Then at a distance 5 cm from the centre it will be(1) 16 E (2) 4 E (3) 2 E (4) Zero
Answer» The electric field at 20 cm from the centre of a uniformly charged sphere of radius 10 cm is E. Then at a distance 5 cm from the centre it will be (1) 16 E (2) 4 E (3) 2 E (4) Zero

Discussion

1013.	Three very large plates of same area kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperature 2T and 3T respectively. The temperature of the middle (i.e. sound) plate under steady state condition is (correct answer + 1, wrong answer - 0.25)
Answer» Three very large plates of same area kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperature $2 T$ and $3 T$ respectively. The temperature of the middle (i.e. sound) plate under steady state condition is (correct answer + 1, wrong answer - 0.25)

Discussion

1014.	If the longitudinal strain in a cubical body is three times the lateral strain then the bulk modulus K, Young's modulus Y and rigidity modulus G are related by
Answer» If the longitudinal strain in a cubical body is three times the lateral strain then the bulk modulus $K$ , Young's modulus $Y$ and rigidity modulus $G$ are related by

Discussion

1015.	If a given mass of gas occupies a volume of 10 cc at 1 atm pressure and temperature 100∘C. What will be its volume at 4 atm, the temperature being the same?
Answer» If a given mass of gas occupies a volume of $10 cc$ at $1 atm$ pressure and temperature $100^{\circ} C$ . What will be its volume at $4 atm$ , the temperature being the same?

Discussion

1016.	2 charges +2uC and +8uC are placed at 2 vertical of an equilateral triangle of side 1 m find the potential at 3rd vertex of triangle
Answer» 2 charges +2uC and +8uC are placed at 2 vertical of an equilateral triangle of side 1 m find the potential at 3rd vertex of triangle

Discussion

1017.	A position dependent force, F=(7−2x+3x2) N acts on a small body of mass 2 kg and displaces it from x=0 to x=5 m. The work done in joules is
Answer» A position dependent force, $F = (7 - 2 x + 3 x^{2}) N$ acts on a small body of mass $2 kg$ and displaces it from $x = 0$ to $x = 5 m$ . The work done in joules is

Discussion

1018.	A fan is rotating with angular velocity 100 revs/sec. Then it is switched off. It takes 5 minutes to stop.(i) Find the total number of revolutions made before it stops. (Assume uniform angular retardation)(ii) Find the value of angular retardation.(iii) Find the average angular velocity during this interval.
Answer» A fan is rotating with angular velocity 100 revs/sec. Then it is switched off. It takes 5 minutes to stop. (i) Find the total number of revolutions made before it stops. (Assume uniform angular retardation) (ii) Find the value of angular retardation. (iii) Find the average angular velocity during this interval.

Discussion

1019.	In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m s¯¹and 63 m s¯¹ respectively. What is the lift on the wing if its area is 2.5 m2 ? Take the density of air to be 1.3 kg m¯³.
Answer» In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m s¯¹and 63 m s¯¹ respectively. What is the lift on the wing if its area is 2.5 m2 ? Take the density of air to be 1.3 kg m¯³.

Discussion

1020.	In the circuit shown below, the switch S is connected to position P for a long time so that the charge on the capacitor becomes q1 μC. Then S is switched to position Q. After the long time, the charge on the capacitor is q2 μC. The magnitude of q2 (in μC) is
Answer» In the circuit shown below, the switch $S$ is connected to position $P$ for a long time so that the charge on the capacitor becomes $q_{1} μ C$ . Then $S$ is switched to position $Q$ . After the long time, the charge on the capacitor is $q_{2} μ C .$ The magnitude of $q_{2}$ (in $μ C$ ) is

Discussion

1021.	Two capacitors each of capacitance C are to a battery of emf E as shown in the figure. The polarity of the battery is now reversed. Calculate the charge that flows through the battery.
Answer» Two capacitors each of capacitance $C$ are to a battery of emf $E$ as shown in the figure. The polarity of the battery is now reversed. Calculate the charge that flows through the battery.

Discussion

1022.	A cylindrical space of radius R is filled with a uniform magnetic induction B parallel to the axis of the cylinder. If B changes at a constant rate, the graph showing the variation of induced electric field with distance r from the axis of cylinder is
Answer» A cylindrical space of radius $R$ is filled with a uniform magnetic induction $B$ parallel to the axis of the cylinder. If $B$ changes at a constant rate, the graph showing the variation of induced electric field with distance $r$ from the axis of cylinder is

Discussion

1023.	A force F = (31+4)N is acting on a point masskg at a point A (2m, 2m). Find the2angular acceleration of the line OA at this instant.(1) 1 rad/s2(2)rad/s2(3)rad/s2rad/s2()
Answer» A force F = (31+4)N is acting on a point masskg at a point A (2m, 2m). Find the2angular acceleration of the line OA at this instant.(1) 1 rad/s2(2)rad/s2(3)rad/s2rad/s2()

Discussion

1024.	The minimum value of the function f(x)=x3−3x2−24x+100 in the interval [−3,3] is
Answer» The minimum value of the function $f (x) = x^{3} - 3 x^{2} - 24 x + 100$ in the interval $[- 3, 3]$ is

Discussion

1025.	A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance?[Take speed of sound =340 m/s]
Answer» A tuning fork of frequency $340 Hz$ is vibrated just above the tube of $120 cm$ height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? $[$ Take speed of sound $= 340 m/s]$

Discussion

1026.	86. A body placed on an inclined plane just start sliding downwards when the plane is at inclined at an angle of 30^° to the horizontal. Find the acceleration of the body when it is inclined at an angle of 45^° with the horizontal.
Answer» 86. A body placed on an inclined plane just start sliding downwards when the plane is at inclined at an angle of 30^° to the horizontal. Find the acceleration of the body when it is inclined at an angle of 45^° with the horizontal.

Discussion

1027.	Ashort bar magnet has a magnetic moment of 0.48 J T−1.Give the direction and magnitude of the magnetic field produced bythe magnet at a distance of 10 cm from the centre of the magnet on(a) the axis, (b) the equatorial lines (normal bisector) of themagnet.
Answer» A short bar magnet has a magnetic moment of 0.48 J T⁻¹. Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on (a) the axis, (b) the equatorial lines (normal bisector) of the magnet.

Discussion

1028.	Calculate TVC and AVC from the following table : Output (in units)0123TC (Rs)50150230290
Answer» Calculate TVC and AVC from the following table : $\begin{matrix} Output (in units) & 0 & 1 & 2 & 3 TC (Rs) & 50 & 150 & 230 & 290 \end{matrix}$

1028.

Calculate TVC and AVC from the following table : Output (in units)0123TC (Rs)50150230290

Answer»

Calculate TVC and AVC from the following table :

$\begin{matrix} Output (in units) & 0 & 1 & 2 & 3 TC (Rs) & 50 & 150 & 230 & 290 \end{matrix}$

Discussion

1029.	The potential energy (in joule) of a body of mass 2 kg moving in the x−y plane is given by U=6x+8y, where the position coordinates x and y are measured in metres. The body is at rest at point (6 m,4 m) at time t=0. It will cross the y− axis at time t equal to
Answer» The potential energy (in joule) of a body of mass $2 kg$ moving in the $x - y$ plane is given by $U = 6 x + 8 y$ , where the position coordinates $x$ and $y$ are measured in metres. The body is at rest at point $(6 m, 4 m)$ at time $t = 0$ . It will cross the $y -$ axis at time $t$ equal to

Discussion

1030.	Two cars A and B are at positions 100 m and 200 m from the origin at t = 0. They start simultaneously with velocities 10 and 5 m/s respectively. The car A will overtake the car B at a distance of
Answer» Two cars A and B are at positions 100 m and 200 m from the origin at t = 0. They start simultaneously with velocities 10 and 5 m/s respectively. The car A will overtake the car B at a distance of

Discussion

1031.	In the spectrum of hydrogen atom, ratio of the longest wavelength in Lyman series to the longest wavelength in Balmer series is:
Answer» In the spectrum of hydrogen atom, ratio of the longest wavelength in Lyman series to the longest wavelength in Balmer series is:

Discussion

1032.	The position of a particle moving along the x-axis is expressed as x=at3+bt2+ct+d. The initial acceleration of the particle is
Answer» The position of a particle moving along the $x$ -axis is expressed as $x = a t^{3} + b t^{2} + c t + d$ . The initial acceleration of the particle is

Discussion

1033.	Two liquids L_1, and L_2 are at 20^†extdegree Cand 40^†extdegree C respectively. When equal masses of them are mixed together the temperature of the mixture becomes 35^†extdegree C. The ratio of specific heat capacities of L_1, and L_2 is
Answer» Two liquids L_1, and L_2 are at 20^†extdegree Cand 40^†extdegree C respectively. When equal masses of them are mixed together the temperature of the mixture becomes 35^†extdegree C. The ratio of specific heat capacities of L_1, and L_2 is

Discussion

1034.	What happens to the temperature of a gas in adiabatic expansion?
Answer» What happens to the temperature of a gas in adiabatic expansion?

Discussion

1035.	Assume that the supply voltage in the figure shown below starts decreasing from 30 V to 0. The maximum supply voltage at which the zener diode loses its regulating ability is _____V 27
Answer» Assume that the supply voltage in the figure shown below starts decreasing from 30 V to 0. The maximum supply voltage at which the zener diode loses its regulating ability is _____V 27

Discussion

1036.	A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ m0 of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:
Answer» A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ m₀ of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:

1036.

A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ m0 of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:

Answer»

A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ m₀ of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:

Discussion

1037.	A particle of mass M is situated at the centre of a spherical shell of same mass and radius R. The gravitational potential at a point situated at R2 distance from the centre will be
Answer» A particle of mass M is situated at the centre of a spherical shell of same mass and radius R. The gravitational potential at a point situated at $\frac{R}{2}$ distance from the centre will be

Discussion

1038.	what is chemical bonding?
Answer» what is chemical bonding?

Discussion

1039.	Electromagnetic waves are transverse in nature is evident by
Answer» Electromagnetic waves are transverse in nature is evident by

Discussion

1040.	Two gas bulbs A and B are connected by a tube having a stop cock. Bulb A has a volume of 100 ml and contains H2 . After stopcock is opened, H2 from A travels to evacuated bulb B and the pressure falls to 40%. The volume of B in ml is –
Answer» Two gas bulbs A and B are connected by a tube having a stop cock. Bulb A has a volume of 100 ml and contains $H_{2}$ . After stopcock is opened, $H_{2}$ from A travels to evacuated bulb B and the pressure falls to $40 %$ . The volume of B in ml is –

Discussion

1041.	22.Is current density property of material
Answer» 22.Is current density property of material

Discussion

1042.	what is electric discharge through gases?
Answer» what is electric discharge through gases?

Discussion

1043.	If the ratio of diameters, lengths and Young’s moduli of steel and brass wires shown in the figure are p,q,r respectively. Then the corresponding ratio of increase in their lengths would be
Answer» If the ratio of diameters, lengths and Young’s moduli of steel and brass wires shown in the figure are $p, q, r$ respectively. Then the corresponding ratio of increase in their lengths would be

Discussion

1044.	A wire of cross-section area 2 mm2 is stretched by 0.1 mm by a certain force. How far (length) will the wire of same material and length but area 8 mm2 stretch under the action of same force?
Answer» A wire of cross-section area $2 {mm}^{2}$ is stretched by $0.1 mm$ by a certain force. How far (length) will the wire of same material and length but area $8 {mm}^{2}$ stretch under the action of same force?

Discussion

1045.	2 moles of gas A effuses from a container in 10 min. How many moles of gas B would effuse through the same container in same time under similar conditions. Ratio of specific gas constant for gas A to the gas B is 1:16.
Answer» $2 moles$ of gas $A$ effuses from a container in $10 min$ . How many moles of gas $B$ would effuse through the same container in same time under similar conditions. Ratio of specific gas constant for gas $A$ to the gas $B$ is $1 : 16$ .

Discussion

1046.	The virtual current of 4A and 50Hz flows in an accident circuit . The power consumed is 240W if the virtual voltage across the coil is 100V ,then it's resistance will be
Answer» The virtual current of 4A and 50Hz flows in an accident circuit . The power consumed is 240W if the virtual voltage across the coil is 100V ,then it's resistance will be

Discussion

1047.	92.A ball of mass m moving with velocity v strikes a wall normally and returns without loss of energy. The variation of force on the ball by the wall with time has been shown in yhe figure. Value of Fo is
Answer» 92.A ball of mass m moving with velocity v strikes a wall normally and returns without loss of energy. The variation of force on the ball by the wall with time has been shown in yhe figure. Value of Fo is

Discussion

1048.

The electric field E is measured at a point P(0, 0, d) generated due to various charge distributions and the dependence of E on d is found to be different for different charge distributions. List - I contains different relations between E and d. List - II describes different electric charge distributions, along with their locations. Match the functions in List - I with the related charge distributions in List - II List - IList - II(P) E is independent of d(1) A point charge Q at the origin(Q) E∝1d(2) A small dipole with point charges Q at (0,0,l) and - Q at (0,0,−l). Take 2l<<d(R) E∝1d2(3) A infinite line charge coincident with the x-axis, with uniform linear charge density λ.(S) E∝1d3(4) Two infinite wires carrying uniform linear charge density parallel to the x-axis. The one along (y=0,z=l) has a charge density + λ and the one along (y=0,z=−l) has a charge density −λ. Take 2l<<d (5) Infinite plane charge coincident with the xy-plane with uniform surface charge density

Answer»

The electric field E is measured at a point P(0, 0, d) generated due to various charge distributions and the dependence of E on d is found to be different for different charge distributions. List - I contains different relations between E and d. List - II describes different electric charge distributions, along with their locations. Match the functions in List - I with the related charge distributions in List - II

List - I	List - II
(P) E is independent of d	(1) A point charge Q at the origin
(Q) $E \propto \frac{1}{d}$	(2) A small dipole with point charges Q at $(0, 0, l)$ and - Q at $(0, 0, - l)$ . Take $2 l << d$
(R) $E \propto \frac{1}{d^{2}}$	(3) A infinite line charge coincident with the x-axis, with uniform linear charge density $λ$ .
(S) $E \propto \frac{1}{d^{3}}$	(4) Two infinite wires carrying uniform linear charge density parallel to the x-axis. The one along ( $y = 0, z = l$ ) has a charge density + $λ$ and the one along $(y = 0, z = - l)$ has a charge density $- λ$ . Take $2 l << d$
	(5) Infinite plane charge coincident with the xy-plane with uniform surface charge density

Discussion

1049.	The acceleration due to gravity at a height 1 km above earth is the same as a depth d below the surface of earth. Then (1)d= 1/2 km (2)d=1 km (3)d= 3/2 km (4)d=2 km
Answer» The acceleration due to gravity at a height 1 km above earth is the same as a depth d below the surface of earth. Then (1)d= 1/2 km (2)d=1 km (3)d= 3/2 km (4)d=2 km

Discussion

1050.	Explain why mercury is used as a barometric fluid, instead of water.
Answer» Explain why mercury is used as a barometric fluid, instead of water.

Discussion

Explore topic-wise InterviewSolutions in .

A ball is projected from ground with a speed of 30 m/s , find θ so that ball passes through point A. (g=10 ms−2)

The position x of a particle moving along x -axis is given by the equation t=x +2 , where x is in metres and tin seconds .find the work done by the force in first four seconds.

63.A sphere of radius R1is suspended within a hollow sphere of R2 (R2>R1) the Inner sphere is charged to a potential P when outer sphere is earth then find the charge on in.er sphere

A ball is thrown from the ground to clear a wall 3 m high at a distance of 6 m and falls 18 m away from the wall, the angle of projection of ball with horizontal is

Three rods of the same dimension have thermal conductivities 3K, 2K and K.They are arranged as shown in fig. Given below, with their ends at 100∘ C, 50∘ C and 20∘ C. The temperature of their junction is

The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K, the root mean square speed of the gas molecules is v then at 480 K it will be

A body travels half ofits total path in the last second of its free fall from rest.The duration of fall is nearly (a)3.4sec (b)4.5sec (c)5sec (d)5.5sec

Two batteries one of the emf 3 V, internal resistance 1 ohm and the other of emf 15 V, internal resistance 2 ohm are connected in series with a resistance R as shown. If the potential difference between a and b is zero, the resistance of R in ohm is

Consider an YDSE that has different slit widths, as a result, amplitude of waves from two slits are A and 2A, respectively. If I0 be the maximum intensity of the interference pattern, then intensity of the pattern for phase difference ϕ is

If an electron enters into a space between the plates of a parallel plate capacitor at an angle α with the plates and leaves at an angle β to the plates. The ratio of its kinetic energy while entering the capacitor to that while leaving will be

A particle executing SHM completes 1200 oscillations per minute and passes the mean position with a velocity of 3.14 m/s.to find the maximum displacement of a particle from the mean position .also obtain the displacement equation of the particle if its displacement is zero at instant t=0.

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

If the longitudinal strain in a cubical body is three times the lateral strain then the bulk modulus K, Young's modulus Y and rigidity modulus G are related by

If a given mass of gas occupies a volume of 10 cc at 1 atm pressure and temperature 100∘C. What will be its volume at 4 atm, the temperature being the same?

2 charges +2uC and +8uC are placed at 2 vertical of an equilateral triangle of side 1 m find the potential at 3rd vertex of triangle

A position dependent force, F=(7−2x+3x2) N acts on a small body of mass 2 kg and displaces it from x=0 to x=5 m. The work done in joules is

In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m s¯¹and 63 m s¯¹ respectively. What is the lift on the wing if its area is 2.5 m2 ? Take the density of air to be 1.3 kg m¯³.

In the circuit shown below, the switch S is connected to position P for a long time so that the charge on the capacitor becomes q1 μC. Then S is switched to position Q. After the long time, the charge on the capacitor is q2 μC. The magnitude of q2 (in μC) is

Two capacitors each of capacitance C are to a battery of emf E as shown in the figure. The polarity of the battery is now reversed. Calculate the charge that flows through the battery.

A cylindrical space of radius R is filled with a uniform magnetic induction B parallel to the axis of the cylinder. If B changes at a constant rate, the graph showing the variation of induced electric field with distance r from the axis of cylinder is

A force F = (31+4)N is acting on a point masskg at a point A (2m, 2m). Find the2angular acceleration of the line OA at this instant.(1) 1 rad/s2(2)rad/s2(3)rad/s2rad/s2()

The minimum value of the function f(x)=x3−3x2−24x+100 in the interval [−3,3] is

A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance?[Take speed of sound =340 m/s]

86. A body placed on an inclined plane just start sliding downwards when the plane is at inclined at an angle of 30^° to the horizontal. Find the acceleration of the body when it is inclined at an angle of 45^° with the horizontal.

Ashort bar magnet has a magnetic moment of 0.48 J T−1.Give the direction and magnitude of the magnetic field produced bythe magnet at a distance of 10 cm from the centre of the magnet on(a) the axis, (b) the equatorial lines (normal bisector) of themagnet.

Calculate TVC and AVC from the following table : Output (in units)0123TC (Rs)50150230290

The potential energy (in joule) of a body of mass 2 kg moving in the x−y plane is given by U=6x+8y, where the position coordinates x and y are measured in metres. The body is at rest at point (6 m,4 m) at time t=0. It will cross the y− axis at time t equal to

Two cars A and B are at positions 100 m and 200 m from the origin at t = 0. They start simultaneously with velocities 10 and 5 m/s respectively. The car A will overtake the car B at a distance of

In the spectrum of hydrogen atom, ratio of the longest wavelength in Lyman series to the longest wavelength in Balmer series is:

The position of a particle moving along the x-axis is expressed as x=at3+bt2+ct+d. The initial acceleration of the particle is

Two liquids L_1, and L_2 are at 20^†extdegree Cand 40^†extdegree C respectively. When equal masses of them are mixed together the temperature of the mixture becomes 35^†extdegree C. The ratio of specific heat capacities of L_1, and L_2 is

What happens to the temperature of a gas in adiabatic expansion?

Assume that the supply voltage in the figure shown below starts decreasing from 30 V to 0. The maximum supply voltage at which the zener diode loses its regulating ability is _____V 27

A particle of mass M is situated at the centre of a spherical shell of same mass and radius R. The gravitational potential at a point situated at R2 distance from the centre will be

what is chemical bonding?

Electromagnetic waves are transverse in nature is evident by

Two gas bulbs A and B are connected by a tube having a stop cock. Bulb A has a volume of 100 ml and contains H2 . After stopcock is opened, H2 from A travels to evacuated bulb B and the pressure falls to 40%. The volume of B in ml is –

22.Is current density property of material

what is electric discharge through gases?

If the ratio of diameters, lengths and Young’s moduli of steel and brass wires shown in the figure are p,q,r respectively. Then the corresponding ratio of increase in their lengths would be

A wire of cross-section area 2 mm2 is stretched by 0.1 mm by a certain force. How far (length) will the wire of same material and length but area 8 mm2 stretch under the action of same force?

2 moles of gas A effuses from a container in 10 min. How many moles of gas B would effuse through the same container in same time under similar conditions. Ratio of specific gas constant for gas A to the gas B is 1:16.

The virtual current of 4A and 50Hz flows in an accident circuit . The power consumed is 240W if the virtual voltage across the coil is 100V ,then it's resistance will be

92.A ball of mass m moving with velocity v strikes a wall normally and returns without loss of energy. The variation of force on the ball by the wall with time has been shown in yhe figure. Value of Fo is

The acceleration due to gravity at a height 1 km above earth is the same as a depth d below the surface of earth. Then (1)d= 1/2 km (2)d=1 km (3)d= 3/2 km (4)d=2 km

Explain why mercury is used as a barometric fluid, instead of water.