50278 + Interview Questions in Physics

1.	The centre of mass of a body is located
Answer» The centre of mass of a body is located

Discussion

2.	In the system shown in figure, masses of the blocks are such that when system is released, acceleration of pulley P1 is a upwards and acceleration of block 1 is a1 upwards, such that a<a1<2a. It is found that acceleration of block 3 is same as that of 1 both in magnitude and direction. Column IColumn IIa) Acceleration of 2p)2a+a1b) Acceleration of 4q)2a−a1c) Acceleration of 2 w.r.t. 3r) upwardsd) Acceleration of 2 w.r.t. 4s) downwards
Answer» In the system shown in figure, masses of the blocks are such that when system is released, acceleration of pulley $P_{1}$ is $a$ upwards and acceleration of block 1 is $a_{1}$ upwards, such that $a < a_{1} < 2 a$ . It is found that acceleration of block 3 is same as that of 1 both in magnitude and direction. $\begin{matrix} Column I & Column II a) Acceleration of 2 & p) 2 a + a_{1} b) Acceleration of 4 & q) 2 a - a_{1} c) Acceleration of 2 w.r.t. 3 & r) upwards d) Acceleration of 2 w.r.t. 4 & s) downwards \end{matrix}$

Discussion

3.	A uniform rope of mass 0.1 kg and length 2.45 m hangs from a ceiling. The speed of transverse waves in the rope at appoint 0.5 m from the lower end is approximately
Answer» A uniform rope of mass 0.1 kg and length 2.45 m hangs from a ceiling. The speed of transverse waves in the rope at appoint 0.5 m from the lower end is approximately

Discussion

4.	A prismatic linearly elasitc bar of length L, cross-sectional area A, and made up of a material with Young's modulus E, is subjected to axial tensile force as shown in the figures. When the bar is subjected to axial tensile forces P1 and P2, the strain energies stored in the bar are U1 and U2 respectively.If U is the strain energy stored in the same bar when subjected to an axial tensile forece(P1+P2) , the correct relationship is
Answer» A prismatic linearly elasitc bar of length L, cross-sectional area A, and made up of a material with Young's modulus E, is subjected to axial tensile force as shown in the figures. When the bar is subjected to axial tensile forces $P_{1}$ and $P_{2}$ , the strain energies stored in the bar are $U_{1}$ and $U_{2}$ respectively. If U is the strain energy stored in the same bar when subjected to an axial tensile forece $(P_{1} + P_{2})$ , the correct relationship is

Discussion

5.	Two cylinders of same cross section and length L but made of two materials of density ρ1 and ρ2 are cemented together to form a cylinder 2L. If the combination floats in water with length L/2 above the surface of water ρ11g/cc B. ρ13/2 g/cc D. ρ1
Answer» Two cylinders of same cross section and length L but made of two materials of density ρ1 and ρ2 are cemented together to form a cylinder 2L. If the combination floats in water with length L/2 above the surface of water ρ11g/cc B. ρ1<8/9 g/cc C. ρ1>3/2 g/cc D. ρ1<3/4 g/c

Discussion

6.	A point charge Q is located just above the centre O of the flat face of a hemisphere as shown in the figure. The electric flux through the flat face is
Answer» A point charge $Q$ is located just above the centre $O$ of the flat face of a hemisphere as shown in the figure. The electric flux through the flat face is

Discussion

7.	An aeroplane is in a level flight at 144km/h at an altitude of 1000m. How far from a target should a bomb be released from it to hit the target
Answer» An aeroplane is in a level flight at 144km/h at an altitude of 1000m. How far from a target should a bomb be released from it to hit the target

Discussion

8.	when a YDSE is performed using a monochromatic source of light, fringe width is found to be 1.2 mm. The minimum distance above central maxima at which intensity is (3/4th) of the maximum value is
Answer» when a YDSE is performed using a monochromatic source of light, fringe width is found to be 1.2 mm. The minimum distance above central maxima at which intensity is (3/4th) of the maximum value is

Discussion

9.	In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is
Answer» In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is

Discussion

10.	A parallel plate capacitor with air as medium between the plates has a capacitance of 10 μF. The capacitor is divided into two equal halves and filled with two media having dielectric constant K1=2 and K2=4. The capacitance of the system will be
Answer» A parallel plate capacitor with air as medium between the plates has a capacitance of $10 μ F$ . The capacitor is divided into two equal halves and filled with two media having dielectric constant $K_{1} = 2$ and $K_{2} = 4$ . The capacitance of the system will be

Discussion

11.	what is z component of angular momentum?
Answer» what is z component of angular momentum?

Discussion

12.	Two point charges 310power8C and -210power8C are located 15 CM apart in air. Find at what points on the line joining these charges the electric potential is zero. (Take potential at infinity to be zero. )
Answer» Two point charges 310power8C and -210power8C are located 15 CM apart in air. Find at what points on the line joining these charges the electric potential is zero. (Take potential at infinity to be zero. )

Discussion

13.	A monochromatic beam of light is incident at 60o on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle θ(n) with the normal. For n=√3 the value of θ is 60o and dθdn=m. The value of m is
Answer» A monochromatic beam of light is incident at $60^{o}$ on one face of an equilateral prism of refractive index $n$ and emerges from the opposite face making an angle $θ (n)$ with the normal. For $n = \sqrt{3}$ the value of $θ$ is $60^{o}$ and $\frac{d θ}{d n} = m$ . The value of $m$ is

Discussion

14.	What is the method to find instantaneous velocity?
Answer» What is the method to find instantaneous velocity?

Discussion

15.	The motion of a swing is shown below. Which of the following is the correct graph for kinetic energy (KE) and potential energy (PE) vs displacement from the mean position?
Answer» The motion of a swing is shown below. Which of the following is the correct graph for kinetic energy (KE) and potential energy (PE) vs displacement from the mean position?

Discussion

16.	nta particle moving in a circular pah. the acceleration and momentum of the particle at a certain moment are a=4i+3j and P =8i-6j.the otion of the particle isn ntuniform circlarn ntaccelerated circularn ntdeacc circularn ntnonen
Answer» nta particle moving in a circular pah. the acceleration and momentum of the particle at a certain moment are a=4i+3j and P =8i-6j.the otion of the particle isn ntuniform circlarn ntaccelerated circularn ntdeacc circularn ntnonen

Discussion

17.	An air capacitor of capacity 10 μF is connected to a battery of 12 V. Now the space between the plates is filled with a liquid of dielectric constant 5. The additional charge that flows to the capacitor is
Answer» An air capacitor of capacity $10 μ F$ is connected to a battery of $12 V$ . Now the space between the plates is filled with a liquid of dielectric constant $5$ . The additional charge that flows to the capacitor is

Discussion

18.	A steel tape gives correct measurement at 20∘C. A piece of wood is being measured with the steel tape at 0∘C. The reading is 25 cm on the tape, the real length of the given piece of wood must be
Answer» A steel tape gives correct measurement at $20^{\circ} C$ . A piece of wood is being measured with the steel tape at $0^{\circ} C$ . The reading is 25 cm on the tape, the real length of the given piece of wood must be

Discussion

19.	A curve passes through the point (1,π6). Let the slope of the curve at each point (x, y) be yx+sec(yx),x>0. Then the equation of the curve is
Answer» A curve passes through the point $(1, \frac{π}{6})$ . Let the slope of the curve at each point (x, y) be $\frac{y}{x} + sec (\frac{y}{x}), x > 0$ . Then the equation of the curve is

Discussion

20.	Consider the beta decay198Au→ 198Hg∗+β−+¯¯¯νWhere 198Hg∗ represents a mercury nucleus in an excited state at energy 1.088 MeV above the ground state. What can be the maximum kinetic energy of the electron emitted? The atomic mass of 198Au is 197.968233 u and that of 198Hg is 197.966760 u. c2=931 MeVu
Answer» Consider the beta decay $^{198} Au \to^{198} {Hg}^{} + β^{-} + ¯ ¯ ¯ ν$ Where $^{198} {Hg}^{}$ represents a mercury nucleus in an excited state at energy $1.088 MeV$ above the ground state. What can be the maximum kinetic energy of the electron emitted? The atomic mass of $^{198} Au$ is $197.968233 u$ and that of $^{198} Hg$ is $197.966760 u$ . $c^{2} = 931 \frac{MeV}{u}$

Discussion

21.	In the figure, S1 and S2 are identical springs. The oscillation frequency of the mass m is f. If one spring is removed, the frequency will become
Answer» In the figure, $S_{1} a n d S_{2}$ are identical springs. The oscillation frequency of the mass m is f. If one spring is removed, the frequency will become

21.

In the figure, S1 and S2 are identical springs. The oscillation frequency of the mass m is f. If one spring is removed, the frequency will become

Answer»

In the figure, $S_{1} a n d S_{2}$ are identical springs. The oscillation frequency of the mass m is f. If one spring is removed, the frequency will become

Discussion

22.	11. Current through 10 ohm resistor shown in figure is ??
Answer» 11. Current through 10 ohm resistor shown in figure is ??

Discussion

23.	a heater coil connected across a given potential difference has power P. now the coil is cut into two equal halves and joined in parellel . across the same potential difference ,this combination has power ?
Answer» a heater coil connected across a given potential difference has power P. now the coil is cut into two equal halves and joined in parellel . across the same potential difference ,this combination has power ?

Discussion

24.	An ideal monoatomic gas at temperature 27∘C and pressure 100 bar occupies 5 L volume. 5000 cal of heat is added to the system without changing the volume. Calculate the change in temperature of the gas. (Given, R=8.31 J/mol K)
Answer» An ideal monoatomic gas at temperature $27^{\circ} C$ and pressure $100 bar$ occupies $5 L$ volume. $5000 cal$ of heat is added to the system without changing the volume. Calculate the change in temperature of the gas. (Given, $R = 8.31 J/mol K$ )

Discussion

25.	In a certain region of space gravitational field is given by I=-(K/r)(where r is the dist from a fixed point and K is cons†an t). Taking the referance point to be at r=r° with V=V°.Find the potential at a dis†an ce r
Answer» In a certain region of space gravitational field is given by I=-(K/r)(where r is the dist from a fixed point and K is cons†an t). Taking the referance point to be at r=r° with V=V°.Find the potential at a dis†an ce r

Discussion

26.	What is the focal length of a convex lens of focal length 30cm incontact with a concave lens of focal length 20cm? Is the system aconverging or a diverging lens? Ignore thickness of the lenses.
Answer» What is the focal length of a convex lens of focal length 30cm incontact with a concave lens of focal length 20cm? Is the system aconverging or a diverging lens? Ignore thickness of the lenses.

Discussion

27.	4.A disc of radius R is moving with velocity of centre of mass v and angular speed ω as shown in the figure. The angular momentum of the disc about point O is 1) Iω 2) Rmv 3) Iω + Rmv 4) Iω - Rmv
Answer» 4.A disc of radius R is moving with velocity of centre of mass v and angular speed ω as shown in the figure. The angular momentum of the disc about point O is 1) Iω 2) Rmv 3) Iω + Rmv 4) Iω - Rmv

Discussion

28.	A particle moves from point P(1,2,3)m to Q(2,1,4)m under the action of a constant force F = (2i+j+k)N. Work done by the force is?
Answer» A particle moves from point P(1,2,3)m to Q(2,1,4)m under the action of a constant force F = (2i+j+k)N. Work done by the force is?

Discussion

29.	Assertion. If a metal sheet is introduced in between plates of a parallel plate capacitor, then capacitance increases Reason. On insertion of the metal between the plates of a parallel plate capacitor electric field always decreases
Answer» Assertion. If a metal sheet is introduced in between plates of a parallel plate capacitor, then capacitance increases Reason. On insertion of the metal between the plates of a parallel plate capacitor electric field always decreases

Discussion

30.	Compute the fractional change in volume of a glass slab, when subjected to a hydraulic pressure of 10 atm.
Answer» Compute the fractional change in volume of a glass slab, when subjected to a hydraulic pressure of 10 atm.

Discussion

31.	A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 T. The force on the proton is (mass of proton = 1.6×10−27kg)
Answer» A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 T. The force on the proton is (mass of proton = $1.6 \times 10^{- 27} k g$ )

Discussion

32.	From the given graph (in red colour) match the mentioned points (column I)with their slope (column II)Column I Column II(p) X = 2 (i) 2 (q) X = 6 (ii) 6(r) X = 10 (iii) 10 (iv) 0 (v) 12 (vi) −12
Answer» From the given graph (in red colour) match the mentioned points (column I) with their slope (column II) Column I Column II (p) X = 2 (i) 2 (q) X = 6 (ii) 6 (r) X = 10 (iii) 10 (iv) 0 (v) $\frac{1}{2}$ (vi) $\frac{- 1}{2}$

32.

From the given graph (in red colour) match the mentioned points (column I)with their slope (column II)Column I Column II(p) X = 2 (i) 2 (q) X = 6 (ii) 6(r) X = 10 (iii) 10 (iv) 0 (v) 12 (vi) −12

Answer»

From the given graph (in red colour) match the mentioned points (column I)

with their slope (column II)

Column I Column II

(p) X = 2 (i) 2

(q) X = 6 (ii) 6

(r) X = 10 (iii) 10

(iv) 0

(v) $\frac{1}{2}$

(vi) $\frac{- 1}{2}$

Discussion

33.	A coil of inductance L=2.0 μH and resistance R=1.0 Ω is connected to a source of constant emf ϵ=3.0 V resistance R0=2.0 Ω is connected in parallel with the coil.The amount of heat generated in the coil after the switch Sw is disconected (in microjoule) is (The internal resistance of the source is negligible.)
Answer» A coil of inductance $L = 2.0 μ H$ and resistance $R = 1.0 Ω$ is connected to a source of constant emf $ϵ = 3.0 V$ resistance $R_{0} = 2.0 Ω$ is connected in parallel with the coil.The amount of heat generated in the coil after the switch $S_{w}$ is disconected (in microjoule) is (The internal resistance of the source is negligible.)

Discussion

34.	A resistor of resistance 100 Ω is connected to an AC source, E=12sin(250πt) V. Find the energy dissipated as heat across resistor during, t=0 to t=1 ms.
Answer» A resistor of resistance $100 Ω$ is connected to an AC source, $E = 12 sin (250 π t) V$ . Find the energy dissipated as heat across resistor during, $t = 0$ to $t = 1 ms$ .

Discussion

35.	36. A cubical box of wood of side 30 cm weighing 21.6 kg floats on water with two faces horizontal the depth of immersion of box is
Answer» 36. A cubical box of wood of side 30 cm weighing 21.6 kg floats on water with two faces horizontal the depth of immersion of box is

Discussion

36.	If →a, →b, →c are mutually perpendicular vectors of equal magnitudes, then the angle between the vectors →a and →a+→b+→c is
Answer» If $\to a, \to b, \to c$ are mutually perpendicular vectors of equal magnitudes, then the angle between the vectors $\to a$ and $\to a + \to b + \to c$ is

Discussion

37.	Figure (15-E2) shows a plot of the transverse displacements of the particles of a string at t = 0 through which a travelling wave is passing in the positive x-direction. The wave speed is 20 cm s−1. Find (a) the amplitude, (b) the wavelength, (c) the wave number and (d) the frequency of the wave.
Answer» Figure (15-E2) shows a plot of the transverse displacements of the particles of a string at t = 0 through which a travelling wave is passing in the positive x-direction. The wave speed is $20 c m s^{- 1}$ . Find (a) the amplitude, (b) the wavelength, (c) the wave number and (d) the frequency of the wave.

37.

Figure (15-E2) shows a plot of the transverse displacements of the particles of a string at t = 0 through which a travelling wave is passing in the positive x-direction. The wave speed is 20 cm s−1. Find (a) the amplitude, (b) the wavelength, (c) the wave number and (d) the frequency of the wave.

Answer»

Figure (15-E2) shows a plot of the transverse displacements of the particles of a string at t = 0 through which a travelling wave is passing in the positive x-direction. The wave speed is $20 c m s^{- 1}$ . Find (a) the amplitude, (b) the wavelength, (c) the wave number and (d) the frequency of the wave.

Discussion

38.	which type of attractive force is present between the polar and non polar molecule
Answer» which type of attractive force is present between the polar and non polar molecule

Discussion

39.	The gravitational field due to a mass distribution is E=Kx3 in the x - direction (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is
Answer» The gravitational field due to a mass distribution is $E = \frac{K}{x^{3}}$ in the x - direction (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is

Discussion

40.	A boy of height 1.5 m is moving on a skateboard due east with velocity 4 m/s. He throws a coin vertically upward with a velocity of 3 m/s relative to himself. Find the total displacement of the coin relative to ground till it comes to the hand of the boy. Take g=10 m/s2.
Answer» A boy of height $1.5 m$ is moving on a skateboard due east with velocity $4 m/s$ . He throws a coin vertically upward with a velocity of $3 m/s$ relative to himself. Find the total displacement of the coin relative to ground till it comes to the hand of the boy. Take $g = 10 {m/s}^{2}$ .

Discussion

41.	In the experiment of the meter bridge if length corresponding to null deflection is x, what would be the value of null deflection when radius of meter bridge is double
Answer» In the experiment of the meter bridge if length corresponding to null deflection is x, what would be the value of null deflection when radius of meter bridge is double

Discussion

42.	A small source of sound has mass M and is attached to a spring of force constant k. It is oscillating with an amplitude A=v20√Mk where v is the speed of sound in air. The source of sound produces a sound of frequency f0=399 Hz. Find the range of frequencies registered by the stationary observer standing at a distant point O.
Answer» A small source of sound has mass $M$ and is attached to a spring of force constant $k$ . It is oscillating with an amplitude $A = \frac{v}{20} \sqrt{\frac{M}{k}}$ where $v$ is the speed of sound in air. The source of sound produces a sound of frequency $f_{0} = 399 Hz .$ Find the range of frequencies registered by the stationary observer standing at a distant point $O$ .

Discussion

43.	A particle is projected at an angle 60∘ with the horizontal with a speed 10 m/s. Find angular velocity when particle reaches X-axis, about an axis passing through origin ang along Z-axis.
Answer» A particle is projected at an angle $60^{\circ}$ with the horizontal with a speed $10 m / s$ . Find angular velocity when particle reaches X-axis, about an axis passing through origin ang along Z-axis.

Discussion

44.	A person is standing in the midway of wall and mirror what is the height of mirror to required by the man of height 6 cm to see complete image of wall of height 5 cm
Answer» A person is standing in the midway of wall and mirror what is the height of mirror to required by the man of height 6 cm to see complete image of wall of height 5 cm

Discussion

45.	A wall has two layers A and B, each made of different material. Both the layers have the same thickness. The thermal conductivity for A is twice that of B. Under steady state, the temperature difference across the whole wall is 36∘C. Then the temperature difference across the layer A is
Answer» A wall has two layers $A$ and $B$ , each made of different material. Both the layers have the same thickness. The thermal conductivity for $A$ is twice that of $B$ . Under steady state, the temperature difference across the whole wall is $36^{\circ} C$ . Then the temperature difference across the layer $A$ is

Discussion

46.	Two concentric, co-planar, circular loops have diameters 10 cm and 1 m and resistance per unit length of the wire, 10−4 Ω/m. A time-dependent voltage V=(4+2.5t) volts is applied to the larger ring as shown. The current induced in the smaller loop is approximately,
Answer» Two concentric, co-planar, circular loops have diameters $10 cm$ and $1 m$ and resistance per unit length of the wire, $10^{- 4} Ω / m$ . A time-dependent voltage $V = (4 + 2.5 t) volts$ is applied to the larger ring as shown. The current induced in the smaller loop is approximately,

Discussion

47.	A suspension of sand like particles in water with particles of diameter 0.10 mm and below is falling into a sedimentation tank at 0.1 m3/s,g=9.8m/s2, Specific gravity of particles = 2.65, and kinematic viscosity of water =1.0105×10−2cm2/s. The minimum surface area (in m2) required for this setting tank to remove particles of size 0.06 mm and above with 100% efficiency is31.214
Answer» A suspension of sand like particles in water with particles of diameter 0.10 mm and below is falling into a sedimentation tank at $0.1 m^{3} / s, g = 9.8 m / s^{2}$ , Specific gravity of particles = 2.65, and kinematic viscosity of water $= 1.0105 \times 10^{- 2} c m^{2} / s$ . The minimum surface area (in $m^{2}$ ) required for this setting tank to remove particles of size 0.06 mm and above with 100% efficiency is 31.214

Discussion

48.	For a particle moving in x-y plane, its position coordinates as a function of time t is given as x= 3t +5 and y= 4t + 6, where, x, y are in metreand t is in second. The trajectory of the particle is(1) Straight line(2) Circle(3) Ellipse(4) Parabola
Answer» For a particle moving in x-y plane, its position coordinates as a function of time t is given as x= 3t +5 and y= 4t + 6, where, x, y are in metreand t is in second. The trajectory of the particle is(1) Straight line(2) Circle(3) Ellipse(4) Parabola

Discussion

49.	Dimensions of 1μ0 ϵ0,where symbols have their usual meaning,are
Answer» Dimensions of $\frac{1}{μ_{0} ϵ_{0}}$ ,where symbols have their usual meaning,are

Discussion

50.	The earth moves around the sun in an elliptical orbit as shown in figure. The ratio OAOB=x. The ratio of the speed of the earth at B to that at A is nearly
Answer» The earth moves around the sun in an elliptical orbit as shown in figure. The ratio $\frac{O A}{O B} = x$ . The ratio of the speed of the earth at B to that at A is nearly

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The centre of mass of a body is located

A uniform rope of mass 0.1 kg and length 2.45 m hangs from a ceiling. The speed of transverse waves in the rope at appoint 0.5 m from the lower end is approximately

Two cylinders of same cross section and length L but made of two materials of density ρ1 and ρ2 are cemented together to form a cylinder 2L. If the combination floats in water with length L/2 above the surface of water ρ11g/cc B. ρ13/2 g/cc D. ρ1

A point charge Q is located just above the centre O of the flat face of a hemisphere as shown in the figure. The electric flux through the flat face is

An aeroplane is in a level flight at 144km/h at an altitude of 1000m. How far from a target should a bomb be released from it to hit the target

when a YDSE is performed using a monochromatic source of light, fringe width is found to be 1.2 mm. The minimum distance above central maxima at which intensity is (3/4th) of the maximum value is

In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is

A parallel plate capacitor with air as medium between the plates has a capacitance of 10 μF. The capacitor is divided into two equal halves and filled with two media having dielectric constant K1=2 and K2=4. The capacitance of the system will be

what is z component of angular momentum?

Two point charges 3*10power8C and -2*10power8C are located 15 CM apart in air. Find at what points on the line joining these charges the electric potential is zero. (Take potential at infinity to be zero. )

A monochromatic beam of light is incident at 60o on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle θ(n) with the normal. For n=√3 the value of θ is 60o and dθdn=m. The value of m is

What is the method to find instantaneous velocity?

The motion of a swing is shown below. Which of the following is the correct graph for kinetic energy (KE) and potential energy (PE) vs displacement from the mean position?

nta particle moving in a circular pah. the acceleration and momentum of the particle at a certain moment are a=4i+3j and P =8i-6j.the otion of the particle isn ntuniform circlarn ntaccelerated circularn ntdeacc circularn ntnonen

An air capacitor of capacity 10 μF is connected to a battery of 12 V. Now the space between the plates is filled with a liquid of dielectric constant 5. The additional charge that flows to the capacitor is

A steel tape gives correct measurement at 20∘C. A piece of wood is being measured with the steel tape at 0∘C. The reading is 25 cm on the tape, the real length of the given piece of wood must be

A curve passes through the point (1,π6). Let the slope of the curve at each point (x, y) be yx+sec(yx),x&gt;0. Then the equation of the curve is

In the figure, S1 and S2 are identical springs. The oscillation frequency of the mass m is f. If one spring is removed, the frequency will become

11. Current through 10 ohm resistor shown in figure is ??

a heater coil connected across a given potential difference has power P. now the coil is cut into two equal halves and joined in parellel . across the same potential difference ,this combination has power ?

An ideal monoatomic gas at temperature 27∘C and pressure 100 bar occupies 5 L volume. 5000 cal of heat is added to the system without changing the volume. Calculate the change in temperature of the gas. (Given, R=8.31 J/mol K)

In a certain region of space gravitational field is given by I=-(K/r)(where r is the dist from a fixed point and K is cons†an t). Taking the referance point to be at r=r° with V=V°.Find the potential at a dis†an ce r

What is the focal length of a convex lens of focal length 30cm incontact with a concave lens of focal length 20cm? Is the system aconverging or a diverging lens? Ignore thickness of the lenses.

4.A disc of radius R is moving with velocity of centre of mass v and angular speed ω as shown in the figure. The angular momentum of the disc about point O is 1) Iω 2) Rmv 3) Iω + Rmv 4) Iω - Rmv

A particle moves from point P(1,2,3)m to Q(2,1,4)m under the action of a constant force F = (2i+j+k)N. Work done by the force is?

Assertion. If a metal sheet is introduced in between plates of a parallel plate capacitor, then capacitance increases Reason. On insertion of the metal between the plates of a parallel plate capacitor electric field always decreases

Compute the fractional change in volume of a glass slab, when subjected to a hydraulic pressure of 10 atm.

A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 T. The force on the proton is (mass of proton = 1.6×10−27kg)

From the given graph (in red colour) match the mentioned points (column I)with their slope (column II)Column I Column II(p) X = 2 (i) 2 (q) X = 6 (ii) 6(r) X = 10 (iii) 10 (iv) 0 (v) 12 (vi) −12

A resistor of resistance 100 Ω is connected to an AC source, E=12sin(250πt) V. Find the energy dissipated as heat across resistor during, t=0 to t=1 ms.

36. A cubical box of wood of side 30 cm weighing 21.6 kg floats on water with two faces horizontal the depth of immersion of box is

If →a, →b, →c are mutually perpendicular vectors of equal magnitudes, then the angle between the vectors →a and →a+→b+→c is

Figure (15-E2) shows a plot of the transverse displacements of the particles of a string at t = 0 through which a travelling wave is passing in the positive x-direction. The wave speed is 20 cm s−1. Find (a) the amplitude, (b) the wavelength, (c) the wave number and (d) the frequency of the wave.

which type of attractive force is present between the polar and non polar molecule

The gravitational field due to a mass distribution is E=Kx3 in the x - direction (K is a constant). Taking the gravitational potential to be zero at infinity, its value at a distance x is

A boy of height 1.5 m is moving on a skateboard due east with velocity 4 m/s. He throws a coin vertically upward with a velocity of 3 m/s relative to himself. Find the total displacement of the coin relative to ground till it comes to the hand of the boy. Take g=10 m/s2.

In the experiment of the meter bridge if length corresponding to null deflection is x, what would be the value of null deflection when radius of meter bridge is double

A particle is projected at an angle 60∘ with the horizontal with a speed 10 m/s. Find angular velocity when particle reaches X-axis, about an axis passing through origin ang along Z-axis.

A person is standing in the midway of wall and mirror what is the height of mirror to required by the man of height 6 cm to see complete image of wall of height 5 cm

A wall has two layers A and B, each made of different material. Both the layers have the same thickness. The thermal conductivity for A is twice that of B. Under steady state, the temperature difference across the whole wall is 36∘C. Then the temperature difference across the layer A is

Two concentric, co-planar, circular loops have diameters 10 cm and 1 m and resistance per unit length of the wire, 10−4 Ω/m. A time-dependent voltage V=(4+2.5t) volts is applied to the larger ring as shown. The current induced in the smaller loop is approximately,

For a particle moving in x-y plane, its position coordinates as a function of time t is given as x= 3t +5 and y= 4t + 6, where, x, y are in metreand t is in second. The trajectory of the particle is(1) Straight line(2) Circle(3) Ellipse(4) Parabola

Dimensions of 1μ0 ϵ0,where symbols have their usual meaning,are

The earth moves around the sun in an elliptical orbit as shown in figure. The ratio OAOB=x. The ratio of the speed of the earth at B to that at A is nearly

Two point charges 310power8C and -210power8C are located 15 CM apart in air. Find at what points on the line joining these charges the electric potential is zero. (Take potential at infinity to be zero. )

A curve passes through the point (1,π6). Let the slope of the curve at each point (x, y) be yx+sec(yx),x>0. Then the equation of the curve is