50278 + Interview Questions in Physics

1.	132.The relation between time t and distance x is given as t= ax+bx where a and b are constants if the velocity of particle is v at a distance x then find retardation of the particle
Answer» 132.The relation between time t and distance x is given as t= ax+bx where a and b are constants if the velocity of particle is v at a distance x then find retardation of the particle

Discussion

2.	Two convex lenses, each of focal length 1.0 cm, are placed at a separation of 15 cm with their principal axes coinciding. (a) Show that a light beam coming parallel to the principal axis diverges as it comes out of the lens system. (b) Find the location of the virtual image formed by the lens system of an object placed far away. (c) Find the focal length of the equivalent lens. (Note that the sign of the focal length is positive although the lens system actually diverges a parallel beam incident on it.)
Answer» Two convex lenses, each of focal length 1.0 cm, are placed at a separation of 15 cm with their principal axes coinciding. (a) Show that a light beam coming parallel to the principal axis diverges as it comes out of the lens system. (b) Find the location of the virtual image formed by the lens system of an object placed far away. (c) Find the focal length of the equivalent lens. (Note that the sign of the focal length is positive although the lens system actually diverges a parallel beam incident on it.)

2.

Two convex lenses, each of focal length 1.0 cm, are placed at a separation of 15 cm with their principal axes coinciding. (a) Show that a light beam coming parallel to the principal axis diverges as it comes out of the lens system. (b) Find the location of the virtual image formed by the lens system of an object placed far away. (c) Find the focal length of the equivalent lens. (Note that the sign of the focal length is positive although the lens system actually diverges a parallel beam incident on it.)

Answer»

Two convex lenses, each of focal length 1.0 cm, are placed at a separation of 15 cm with their principal axes coinciding.

(a) Show that a light beam coming parallel to the principal axis diverges as it comes out of the lens system.

(b) Find the location of the virtual image formed by the lens system of an object placed far away.

(c) Find the focal length of the equivalent lens. (Note that the sign of the focal length is positive although the lens system actually diverges a parallel beam incident on it.)

Discussion

3.	Force between two identical charges placed at a distance r in vacuum is F. Now dielectic constant K=4 is inserted between these two charges . The thickness of the slab is r/2. the force between the charges will now become?
Answer» Force between two identical charges placed at a distance r in vacuum is F. Now dielectic constant K=4 is inserted between these two charges . The thickness of the slab is r/2. the force between the charges will now become?

Discussion

4.	148.With the help of the circuit diagram,explain the working of a p-n junction diode in forward biasing and draw the typical charateristics curves.
Answer» 148.With the help of the circuit diagram,explain the working of a p-n junction diode in forward biasing and draw the typical charateristics curves.

Discussion

5.	A steel ball falls from a height h on a floor for which the coefficient of restitution is e. The height attained by the ball after two rebounds is
Answer» A steel ball falls from a height h on a floor for which the coefficient of restitution is e. The height attained by the ball after two rebounds is

Discussion

6.	A corkball and a tennis ball have same size and shape. Both are pressed with same force. This compresses the tennis ball but the cork ball is not compressed at all. Which of the following statement is true from the above context?
Answer» A corkball and a tennis ball have same size and shape. Both are pressed with same force. This compresses the tennis ball but the cork ball is not compressed at all. Which of the following statement is true from the above context?

Discussion

7.	Find out the distance travelled by the block as shown in figure. If the initial speed of the block is V and μ is the friction coefficient between the surface of block and ground.
Answer» Find out the distance travelled by the block as shown in figure. If the initial speed of the block is $V$ and $μ$ is the friction coefficient between the surface of block and ground.

Discussion

8.

In a thermodynamic process on an ideal monatomic gas, the infinitesimal heat absorbed by the gas is given by TΔX, where T is temperature of the system and ΔX is the infinitesimal change in a thermodynamic quantity X of the system. For a mole of monatomic ideal gas X=32Rln(TTA)+Rln(VVA). Here, R is gas constant, V is volume of gas, TA and VA are constants.The List-I below gives some quantities involved in a process and List-II gives some possible values of these quantities. List-I List-II(i)Work done by the system in process 1→2→3(P)13RT0ln2(ii)Change in intermal energy in process 1→2→3(Q)13RT0(iii)Heat absorbed by the system in process 1→2→3(R)RT0(iv)Heat absotbed by the system in process 1→2(S)43RT0 (T)13RT0(3+ln2) (U)56RT0If the process carricd out on one mole of monoatomic ideal gas is as shown in figure in the PV-diagram with P0V0=13RT0, the correct match is,

Answer»

In a thermodynamic process on an ideal monatomic gas, the infinitesimal heat absorbed by the gas is given by $T Δ X$ , where $T$ is temperature of the system and $Δ X$ is the infinitesimal change in a thermodynamic quantity $X$ of the system. For a mole of monatomic ideal gas $X = \frac{3}{2} R ln (\frac{T}{T_{A}}) + Rln (\frac{V}{V_{A}}) .$ Here, $R$ is gas constant, $V$ is volume of gas, $T_{A}$ and $V_{A}$ are constants.

The List-I below gives some quantities involved in a process and List-II gives some possible values of these quantities.

	List-I		List-II
(i)	Work done by the system in process $1 \to 2 \to 3$	(P)	$\frac{1}{3} {R T}_{0} ln 2$
(ii)	Change in intermal energy in process $1 \to 2 \to 3$	(Q)	$\frac{1}{3} {R T}_{0}$
(iii)	Heat absorbed by the system in process $1 \to 2 \to 3$	(R)	${R T}_{0}$
(iv)	Heat absotbed by the system in process $1 \to 2$	(S)	$\frac{4}{3} {R T}_{0}$
		(T)	$\frac{1}{3} {R T}_{0} (3 + ln 2)$
		(U)	$\frac{5}{6} {R T}_{0}$

If the process carricd out on one mole of monoatomic ideal gas is as shown in figure in the PV-diagram with $P_{0} V_{0} = \frac{1}{3} {R T}_{0}$ , the correct match is,

Discussion

9.	if a mass M syspended by a spring executes SHM with time period T and time period becomes 5T/3 if mass is increased by m then find ratio of m/
Answer» if a mass M syspended by a spring executes SHM with time period T and time period becomes 5T/3 if mass is increased by m then find ratio of m/

Discussion

10.	A thermally insulated vessel contains 150 g of water at 0∘C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0∘C itself. The mass of evaporated water will be closest to(Latent heat of vaporization of water =2.10×106J kg−1 and Latent heat of fusion of water =3.36×105J kg−1)
Answer» A thermally insulated vessel contains $150 g$ of water at $0^{\circ} C$ . Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at $0^{\circ} C$ itself. The mass of evaporated water will be closest to (Latent heat of vaporization of water $= 2.10 \times 10^{6} J k g^{- 1}$ and Latent heat of fusion of water $= 3.36 \times 10^{5} J k g^{- 1})$

Discussion

11.	ntTwo concentric metallic spherical shells are given equal amount of positive charges.Thenn nta)the outer sphere is always at higher potentialn ntb)the inner sphere is always at higher potentialn ntc)both the spheres are at the same potentialn ntd)no prediction can be made about the potential unless the actual value of charges and radii are knownn
Answer» ntTwo concentric metallic spherical shells are given equal amount of positive charges.Thenn nta)the outer sphere is always at higher potentialn ntb)the inner sphere is always at higher potentialn ntc)both the spheres are at the same potentialn ntd)no prediction can be made about the potential unless the actual value of charges and radii are knownn

Discussion

12.	Determine the electric field strength vector if the potential of this field depends on x,y coordinates as V=10axy.
Answer» Determine the electric field strength vector if the potential of this field depends on $x, y$ coordinates as $V = 10 a x y$ .

Discussion

13.	when electricity is passed charges move from higher to lower potentialtrue or false?
Answer» when electricity is passed charges move from higher to lower potential true or false?

Discussion

14.	If a particle moves along a circular orbit with a constant angular velocity, what does it mean?
Answer» If a particle moves along a circular orbit with a constant angular velocity, what does it mean?

Discussion

15.	A horizontal platform with an object placed on it is executing S.H.M. in the vertical direction. The amplitude of oscillation is 3.92×10−3 m. What should be the least period of these oscillations, so that the object is not detached from the platform ?
Answer» A horizontal platform with an object placed on it is executing S.H.M. in the vertical direction. The amplitude of oscillation is $3.92 \times 10^{- 3} m .$ What should be the least period of these oscillations, so that the object is not detached from the platform ?

Discussion

16.	Coulomb's law for electrostatic force between two point charges and Newton's law for gravitational force between two stationary point masses, both have invesrse-square law dependence on the distance between the charges/masses. (a) Compare the strength of these forces by determining the ratio of their magnitudes (i) For an electron and proton (ii) for two protons (b) Estimate the acceleration of electron and proton due to the electrical force of their mutual attraction, when they are 1A (10 rest to -10m) apart? (Mp = 1.62* 10 rest to -27 kg; Me= 9.11*10 rest to -31 kg)
Answer» Coulomb's law for electrostatic force between two point charges and Newton's law for gravitational force between two stationary point masses, both have invesrse-square law dependence on the distance between the charges/masses. (a) Compare the strength of these forces by determining the ratio of their magnitudes (i) For an electron and proton (ii) for two protons (b) Estimate the acceleration of electron and proton due to the electrical force of their mutual attraction, when they are 1A (10 rest to -10m) apart? (Mp = 1.62* 10 rest to -27 kg; Me= 9.11*10 rest to -31 kg)

Discussion

17.	A string of length l fixed at both ends vibrates in resonance with a tuning fork of frequency 'f' at two successive values of tension T1 and T2 in the string. Find the specific mass (mass per unit length) of the string.
Answer» A string of length $l$ fixed at both ends vibrates in resonance with a tuning fork of frequency $' f'$ at two successive values of tension $T_{1}$ and $T_{2}$ in the string. Find the specific mass (mass per unit length) of the string.

Discussion

18.	The area enclosed by a PV graph for one thermodynamic cycle of a heat engine is 610 J. The total thermal energy absorbed by the gas in one cycle is 1300 J. Determine the efficiency of the cycle.
Answer» The area enclosed by a $P V$ graph for one thermodynamic cycle of a heat engine is $610 J$ . The total thermal energy absorbed by the gas in one cycle is $1300 J$ . Determine the efficiency of the cycle.

Discussion

19.	Which graph describes motion of point P on the disc, initially at origin?
Answer» Which graph describes motion of point $P$ on the disc, initially at origin?

Discussion

20.	A body of mass m accelerates uniformly from rest to velocity v1 in time t1. The instantaneous power delivered to the body as a function of time t is
Answer» A body of mass m accelerates uniformly from rest to velocity $v_{1}$ in time $t_{1}$ . The instantaneous power delivered to the body as a function of time t is

Discussion

21.	Who was the English visitor to the studio?
Answer» Who was the English visitor to the studio?

Discussion

22.	A thermally insulated vessel with gaseous nitrogen at a temperature T = 27∘C moves with velocity v = 100 m/s.How much (in per cent) and in what way will the gas pressure changes on a sudden stoppage of the vessel.
Answer» A thermally insulated vessel with gaseous nitrogen at a temperature T = $27^{\circ}$ C moves with velocity v = 100 m/s.How much (in per cent) and in what way will the gas pressure changes on a sudden stoppage of the vessel.

Discussion

23.	A gas turbine with air as the working fluid has an isentropic effciency of 0.70 when operating at a pressure ratio of 3. Now, the pressure ratio of the turbine is increased to 5, while maintaining the same inlet conditions. Assume air as a perfect gas with specific heat ratio γ=1.4. If the speciic work output remains the same for both the cases, the isentropic efficiency of the turbine at the pressure ratio of 5 is(round off to two decimal places)0.514
Answer» A gas turbine with air as the working fluid has an isentropic effciency of $0.70$ when operating at a pressure ratio of $3$ . Now, the pressure ratio of the turbine is increased to $5,$ while maintaining the same inlet conditions. Assume air as a perfect gas with specific heat ratio $γ = 1.4$ . If the speciic work output remains the same for both the cases, the isentropic efficiency of the turbine at the pressure ratio of $5$ is (round off to two decimal places) 0.514

Discussion

24.	A body moving with uniform acceleration has speed 'u'. This speed is doubled while covering a distance's'. When it covers an additional distance 'S'. It's speed would become A. 3u B.5u C.11u D.7u
Answer» A body moving with uniform acceleration has speed 'u'. This speed is doubled while covering a distance's'. When it covers an additional distance 'S'. It's speed would become A. 3u B.5u C.11u D.7u

Discussion

25.	(a) Explain the meaning of the statement ‘electric charge of a body is quantised’. (b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?
Answer» (a) Explain the meaning of the statement ‘electric charge of a body is quantised’. (b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?

25.

(a) Explain the meaning of the statement ‘electric charge of a body is quantised’. (b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?

Answer»

(a) Explain the
meaning of the statement ‘electric charge of a body is
quantised’.

(b) Why can one ignore quantisation of electric charge when
dealing with macroscopic i.e., large scale charges?

Discussion

26.	A projectile a thrown with an angle of inclination 60^° with the horizontal.The speed with which the projectile is thrown is 147 m per sec. Find the time period when the projectile will make angle 45^° with the horizontal.
Answer» A projectile a thrown with an angle of inclination 60^° with the horizontal.The speed with which the projectile is thrown is 147 m per sec. Find the time period when the projectile will make angle 45^° with the horizontal.

Discussion

27.	A solid conducting sphere of radius ′a′ is surrounded by a thin uncharged concentric conducting shell of radius 2a A point charge q is placed at a distance 4a from common centre of conducting sphere and shell.The inner sphere is then grounded.The potential of outer shell is found to beqnπε0a
Answer» A solid conducting sphere of radius $^{'} a^{'}$ is surrounded by a thin uncharged concentric conducting shell of radius $2 a$ $A$ point charge $q$ is placed at a distance $4 a$ from common centre of conducting sphere and shell.The inner sphere is then grounded.The potential of outer shell is found to be $\frac{q}{n π ε_{0} a}$

Discussion

28.	If y=cosx3, then find dydx at x=0
Answer» If $y = cos x^{3}$ , then find $\frac{d y}{d x}$ at $x = 0$

Discussion

29.	The distance of point P on the axis from the Centre of a uniformly charged circular ring where the electric field is maximum, is 2−nR(given radius of the ring is R). The value of n in decimal form is___
Answer» The distance of point P on the axis from the Centre of a uniformly charged circular ring where the electric field is maximum, is $2^{- n} R$ (given radius of the ring is R). The value of n in decimal form is___

Discussion

30.	Energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy in ( eV) required to remove both the electrons from a neutral helium atom is
Answer» Energy of $24.6 eV$ is required to remove one of the electrons from a neutral helium atom. The energy in $(eV)$ required to remove both the electrons from a neutral helium atom is

Discussion

31.	Consider the nuclear reaction, X200 → A110+B90If the binding energy per nucleon for X,A and B is 7.4 MeV,8.2 MeV and 8.2 MeV respectively, what is the energy released?
Answer» Consider the nuclear reaction, $X^{200} \to A^{110} + B^{90}$ If the binding energy per nucleon for $X, A$ and $B$ is $7.4 MeV, 8.2 MeV$ and $8.2 MeV$ respectively, what is the energy released?

Discussion

32.	74.A block of mass 20 kg is moved with constant velocity along an inclined plane of inclination 37^° with help of a force of constant power 50 W. If the coefficient of kinetic friction between block and surface is 0.25, then what fraction of power is used against gravity? (1) Image not present (2) Image not present (3) Image not present (4) Image not present
Answer» 74.A block of mass 20 kg is moved with constant velocity along an inclined plane of inclination 37^° with help of a force of constant power 50 W. If the coefficient of kinetic friction between block and surface is 0.25, then what fraction of power is used against gravity? (1) Image not present (2) Image not present (3) Image not present (4) Image not present

Discussion

33.	There are two long co-axial solenoids of same length l. The inner and outer coils have radii r1 and r2 and number of turns per unit length n1 and n2, respectively. The ratio of mutual inductance to the self-inductance of the inner-coil is:
Answer» There are two long co-axial solenoids of same length $l$ . The inner and outer coils have radii $r_{1} and r_{2}$ and number of turns per unit length $n_{1} and n_{2}$ , respectively. The ratio of mutual inductance to the self-inductance of the inner-coil is:

Discussion

34.	If the coefficient of friction between all surfaces is 0.4 then find the minimum force F applied to have system in equilibrium.
Answer» If the coefficient of friction between all surfaces is $0.4$ then find the minimum force $F$ applied to have system in equilibrium.

Discussion

35.	A point source causes photoelectric effect from a small metal plate. Which of the following curves , may well represent the saturation photo current as a function of the distance between the source and the metal?
Answer» A point source causes photoelectric effect from a small metal plate. Which of the following curves , may well represent the saturation photo current as a function of the distance between the source and the metal?

Discussion

36.	Identify the correct order as indicated in the given diagram of different kind of speed of molecules of same gas.f(v)→ Maxwell speed distribution functionvmp→ Most probable speedvrms→ Root mean square speedvav→ Average speed
Answer» Identify the correct order as indicated in the given diagram of different kind of speed of molecules of same gas. $f (v) \to$ Maxwell speed distribution function $v_{m p} \to$ Most probable speed $v_{r m s} \to$ Root mean square speed $v_{a v} \to$ Average speed

Discussion

37.	The network shown in the figure is part of a complete circuit. If at a certain instant, the current I is 5A and it is decreasing at a rate of 103 As–1 then VB–VA equals
Answer» The network shown in the figure is part of a complete circuit. If at a certain instant, the current I is 5A and it is decreasing at a rate of $10^{3} A s^{- 1}$ then $V_{B} - V_{A}$ equals

Discussion

38.	A thin rod of mass M and length a is free to rotate in horizontal plane about a fixed vertical axis OO′. A thin circular disc of mass M and of radius a/4 is pivoted on this rod with its center at a distance a/4 from the free end so that it can rotate freely about its vertical axis, as shown in the figure. Assume that both the rod and disc have uniform density and they remain horizontal during the motion. An outside stationary observer finds the rod rotating with an angular velocity ω and the disc rotating about its vertical axis with angular velocity 4ω. The total angular momentum of the system about the axis OO′ is (Ma2ω48)n. The value of n is
Answer» A thin rod of mass $M$ and length $a$ is free to rotate in horizontal plane about a fixed vertical axis $O O^{'}$ . A thin circular disc of mass $M$ and of radius $a / 4$ is pivoted on this rod with its center at a distance $a / 4$ from the free end so that it can rotate freely about its vertical axis, as shown in the figure. Assume that both the rod and disc have uniform density and they remain horizontal during the motion. An outside stationary observer finds the rod rotating with an angular velocity $ω$ and the disc rotating about its vertical axis with angular velocity $4 ω$ . The total angular momentum of the system about the axis $O O^{'}$ is $(\frac{M a^{2} ω}{48}) n$ . The value of $n$ is

Discussion

39.	In the arrangement shown in the figure, mass of the block B and A is 2m and m respectively. Surface between B and floor is smooth. The block B is connected to the block C by means of a string pulley system. If the whole system is released, then find the minimum value of mass of block C so that A remains stationary w.r.t. B. Co-efficient of friction between A and B is μ.
Answer» In the arrangement shown in the figure, mass of the block $B$ and $A$ is $2 m$ and $m$ respectively. Surface between $B$ and floor is smooth. The block $B$ is connected to the block $C$ by means of a string pulley system. If the whole system is released, then find the minimum value of mass of block $C$ so that $A$ remains stationary w.r.t. $B$ . Co-efficient of friction between $A$ and $B$ is $μ$ .

Discussion

40.	In given figure, the small block of mass 2m is released from rest when the string is in horizontal position, Displacement of the ring when string makes an angle θ=37∘ with the vertical will be plq. The value of p+q is
Answer» In given figure, the small block of mass $2 m$ is released from rest when the string is in horizontal position, Displacement of the ring when string makes an angle $θ = 37^{\circ}$ with the vertical will be $\frac{p l}{q}$ . The value of $p + q$ is

Discussion

41.	The chain of length L is released from rest on a smooth fixed incline with x = 0 as shown in the figure. Determine velocity v of the chain when a half of the length has fallen (Take L=425m) in m/s. (Neglect edge effect of inclined). (Answer upto two digit after decimal places)
Answer» The chain of length L is released from rest on a smooth fixed incline with x = 0 as shown in the figure. Determine velocity $v$ of the chain when a half of the length has fallen (Take $L = \frac{4}{25} m)$ in m/s. (Neglect edge effect of inclined). (Answer upto two digit after decimal places)

Discussion

42.	Current I is being carried by an infinite wire passing through origin along the direction I+j+k . Find magnetic field due to wire at point (1,1,0)
Answer» Current I is being carried by an infinite wire passing through origin along the direction I+j+k . Find magnetic field due to wire at point (1,1,0)

Discussion

43.	What is the minimum height of the plane mirror to get an image of same height of an object 1.4 m kept 2 m away?
Answer» What is the minimum height of the plane mirror to get an image of same height of an object 1.4 m kept 2 m away?

Discussion

44.	The Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit. If the Ge diode connection be reversed. What will be the values of V0 and I?
Answer» The $S i$ diode and the $G e$ diode start conducting at $0.7 V$ and $0.3 V$ respectively, in the given circuit. If the $G e$ diode connection be reversed. What will be the values of $V_{0}$ and $I ?$

Discussion

45.	A transformer is connected to a 1000 V, 50 Hz supply. The total core loss is 1000 W of which 700 W are hysteresis loss and 300 W are eddy current loss. If the applied voltage is raised to 2000 V and the frequency to 100 Hz, then the new core loss is __________W.2600
Answer» A transformer is connected to a 1000 V, 50 Hz supply. The total core loss is 1000 W of which 700 W are hysteresis loss and 300 W are eddy current loss. If the applied voltage is raised to 2000 V and the frequency to 100 Hz, then the new core loss is __________W. 2600

Discussion

46.	A thin circular ring of radious R and mass M is hinged at its periphery in a vertical plane.If it is slightly displaced from equilibrium position and then released then the time period of oscillation of ring will be;
Answer» A thin circular ring of radious R and mass M is hinged at its periphery in a vertical plane.If it is slightly displaced from equilibrium position and then released then the time period of oscillation of ring will be;

Discussion

47.	A brassrod of length 50 cm and diameter 3.0 mm is joined to a steel rod ofthe same length and diameter. What is the change in length of thecombined rod at 250 °C, if the original lengths are at 40.0 °C?Is there a ‘thermal stress’ developed at the junction?The ends of the rod are free to expand (Co-efficient of linearexpansion of brass = 2.0 × 10–5 K–1,steel = 1.2 × 10–5 K–1).
Answer» A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250 °C, if the original lengths are at 40.0 °C? Is there a ‘thermal stress’ developed at the junction? The ends of the rod are free to expand (Co-efficient of linear expansion of brass = 2.0 × 10^–5K^–1, steel = 1.2 × 10^–5K^–1).

Discussion

48.	A charge Q is placed at the mouth of a conical flask. The flux of the electric field through the flask is
Answer» A charge Q is placed at the mouth of a conical flask. The flux of the electric field through the flask is

Discussion

49.	The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon.At what distance from the centre of the earth, the gravitational force will be zero
Answer» The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force will be zero

Discussion

50.	wt is electromagnetic radiatio
Answer» wt is electromagnetic radiatio

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

132.The relation between time t and distance x is given as t= ax+bx where a and b are constants if the velocity of particle is v at a distance x then find retardation of the particle

Force between two identical charges placed at a distance r in vacuum is F. Now dielectic constant K=4 is inserted between these two charges . The thickness of the slab is r/2. the force between the charges will now become?

148.With the help of the circuit diagram,explain the working of a p-n junction diode in forward biasing and draw the typical charateristics curves.

A steel ball falls from a height h on a floor for which the coefficient of restitution is e. The height attained by the ball after two rebounds is

A corkball and a tennis ball have same size and shape. Both are pressed with same force. This compresses the tennis ball but the cork ball is not compressed at all. Which of the following statement is true from the above context?

Find out the distance travelled by the block as shown in figure. If the initial speed of the block is V and μ is the friction coefficient between the surface of block and ground.

if a mass M syspended by a spring executes SHM with time period T and time period becomes 5T/3 if mass is increased by m then find ratio of m/

Determine the electric field strength vector if the potential of this field depends on x,y coordinates as V=10axy.

when electricity is passed charges move from higher to lower potentialtrue or false?

If a particle moves along a circular orbit with a constant angular velocity, what does it mean?

A horizontal platform with an object placed on it is executing S.H.M. in the vertical direction. The amplitude of oscillation is 3.92×10−3 m. What should be the least period of these oscillations, so that the object is not detached from the platform ?

A string of length l fixed at both ends vibrates in resonance with a tuning fork of frequency 'f' at two successive values of tension T1 and T2 in the string. Find the specific mass (mass per unit length) of the string.

The area enclosed by a PV graph for one thermodynamic cycle of a heat engine is 610 J. The total thermal energy absorbed by the gas in one cycle is 1300 J. Determine the efficiency of the cycle.

Which graph describes motion of point P on the disc, initially at origin?

A body of mass m accelerates uniformly from rest to velocity v1 in time t1. The instantaneous power delivered to the body as a function of time t is

Who was the English visitor to the studio?

A thermally insulated vessel with gaseous nitrogen at a temperature T = 27∘C moves with velocity v = 100 m/s.How much (in per cent) and in what way will the gas pressure changes on a sudden stoppage of the vessel.

A body moving with uniform acceleration has speed 'u'. This speed is doubled while covering a distance's'. When it covers an additional distance 'S'. It's speed would become A. 3u B.5u C.11u D.7u

(a) Explain the meaning of the statement ‘electric charge of a body is quantised’. (b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?

A projectile a thrown with an angle of inclination 60^° with the horizontal.The speed with which the projectile is thrown is 147 m per sec. Find the time period when the projectile will make angle 45^° with the horizontal.

A solid conducting sphere of radius ′a′ is surrounded by a thin uncharged concentric conducting shell of radius 2a A point charge q is placed at a distance 4a from common centre of conducting sphere and shell.The inner sphere is then grounded.The potential of outer shell is found to beqnπε0a

If y=cosx3, then find dydx at x=0

The distance of point P on the axis from the Centre of a uniformly charged circular ring where the electric field is maximum, is 2−nR(given radius of the ring is R). The value of n in decimal form is___

Energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy in ( eV) required to remove both the electrons from a neutral helium atom is

Consider the nuclear reaction, X200 → A110+B90If the binding energy per nucleon for X,A and B is 7.4 MeV,8.2 MeV and 8.2 MeV respectively, what is the energy released?

There are two long co-axial solenoids of same length l. The inner and outer coils have radii r1 and r2 and number of turns per unit length n1 and n2, respectively. The ratio of mutual inductance to the self-inductance of the inner-coil is:

If the coefficient of friction between all surfaces is 0.4 then find the minimum force F applied to have system in equilibrium.

A point source causes photoelectric effect from a small metal plate. Which of the following curves , may well represent the saturation photo current as a function of the distance between the source and the metal?

Identify the correct order as indicated in the given diagram of different kind of speed of molecules of same gas.f(v)→ Maxwell speed distribution functionvmp→ Most probable speedvrms→ Root mean square speedvav→ Average speed

The network shown in the figure is part of a complete circuit. If at a certain instant, the current I is 5A and it is decreasing at a rate of 103 As–1 then VB–VA equals

In given figure, the small block of mass 2m is released from rest when the string is in horizontal position, Displacement of the ring when string makes an angle θ=37∘ with the vertical will be plq. The value of p+q is

The chain of length L is released from rest on a smooth fixed incline with x = 0 as shown in the figure. Determine velocity v of the chain when a half of the length has fallen (Take L=425m) in m/s. (Neglect edge effect of inclined). (Answer upto two digit after decimal places)

Current I is being carried by an infinite wire passing through origin along the direction I+j+k . Find magnetic field due to wire at point (1,1,0)

What is the minimum height of the plane mirror to get an image of same height of an object 1.4 m kept 2 m away?

The Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit. If the Ge diode connection be reversed. What will be the values of V0 ​ and I?

A transformer is connected to a 1000 V, 50 Hz supply. The total core loss is 1000 W of which 700 W are hysteresis loss and 300 W are eddy current loss. If the applied voltage is raised to 2000 V and the frequency to 100 Hz, then the new core loss is __________W.2600

A thin circular ring of radious R and mass M is hinged at its periphery in a vertical plane.If it is slightly displaced from equilibrium position and then released then the time period of oscillation of ring will be;

A charge Q is placed at the mouth of a conical flask. The flux of the electric field through the flask is

The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon.At what distance from the centre of the earth, the gravitational force will be zero

wt is electromagnetic radiatio

The Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit. If the Ge diode connection be reversed. What will be the values of V0 and I?