50278 + Interview Questions in Physics

1.	39.a massless beam of length 5 metre is placed on two wedges A and B. If three forces 3kN, 4kN and 5kN are applied on the beam shown in the figure, then find normal reaction at A and B.
Answer» 39.a massless beam of length 5 metre is placed on two wedges A and B. If three forces 3kN, 4kN and 5kN are applied on the beam shown in the figure, then find normal reaction at A and B.

Discussion

2.	A small square loop of side l is placed inside a large square loop of wire of side L(L>l).The loop are coplanar and thier centre coincide.The mutual inductance of the system isproportional to a).l/L b).l/L c).L/l d).L/l.
Answer» A small square loop of side l is placed inside a large square loop of wire of side L(L>l).The loop are coplanar and thier centre coincide.The mutual inductance of the system isproportional to a).l/L b).l/L c).L/l d).L/l.

Discussion

3.	86.An object of mass m projected with velocity v at an angle Y with horizontal. At highest point it explodes in three fragments in ratio1:1:2 such that 1st part retraces its path ,2nd part just fall dowm . The 3rd part will fall on ground at what distance from point of projection.
Answer» 86.An object of mass m projected with velocity v at an angle Y with horizontal. At highest point it explodes in three fragments in ratio1:1:2 such that 1st part retraces its path ,2nd part just fall dowm . The 3rd part will fall on ground at what distance from point of projection.

Discussion

4.	The speed of electromagnetic wave in a hypothetical medium (whose dielectric constant is 1.5 and relative magnetic permeability is 6) isOptions:0.5 × 108 m/sWrong 2 × 108 m/s3 × 108 m/sShould have chosen 1 × 108 m/s.kindly explain
Answer» The speed of electromagnetic wave in a hypothetical medium (whose dielectric constant is 1.5 and relative magnetic permeability is 6) is Options: 0.5 × 108 m/s Wrong 2 × 108 m/s 3 × 108 m/s Should have chosen 1 × 108 m/s. kindly explain

Discussion

5.	the velocity of sound in air is V_{s .{}}if the density of the air is increase d by 4 times then the new velocity will be
Answer» the velocity of sound in air is V_{s .{}}if the density of the air is increase d by 4 times then the new velocity will be

Discussion

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

Discussion

7.	Transitions between three energy levels in a particular atom give rise to three spectral lines of wavelengths, in increasing magnitudes, λ1,λ2 and λ3. Which one of the following equations correctly relates λ1,λ2, and λ3?
Answer» Transitions between three energy levels in a particular atom give rise to three spectral lines of wavelengths, in increasing magnitudes, $λ_{1}, λ_{2}$ and $λ_{3}$ . Which one of the following equations correctly relates $λ_{1}, λ_{2}$ , and $λ_{3}$ ?

Discussion

8.	Which of the following options represent the correct object image combination w.r.t. a plane mirror inclined at an angle of 45∘ to the horizontal?
Answer» Which of the following options represent the correct object image combination w.r.t. a plane mirror inclined at an angle of $45^{\circ}$ to the horizontal?

Discussion

9.	Two soap bubbles each of radius r are touching each other. The raditus of curvature of the common surfecewill be:
Answer» Two soap bubbles each of radius r are touching each other. The raditus of curvature of the common surfecewill be:

Discussion

10.	The positive, negative and zero sequence impedance of 3-ϕ generator are 0.4 pu, 0.3 and 0.2 pu respectively. For a line to line fault with fault impedance Zf and fault current is If1=0.2If, where If is the fault current with zero fault impedance, then value of Zf will be ______pu.2.8
Answer» The positive, negative and zero sequence impedance of 3- $ϕ$ generator are 0.4 pu, 0.3 and 0.2 pu respectively. For a line to line fault with fault impedance $Z_{f}$ and fault current is $I_{f 1} = 0.2 I_{f}$ , where $I_{f}$ is the fault current with zero fault impedance, then value of $Z_{f}$ will be ______pu. 2.8

Discussion

11.	Q.Two cars leave with a one minute gap and move with an accelaration of 0.2m/s2.How long after the departure of second car the distance between them become equal to three times its initial value? a.2 minute b.3/2 minute c.1 minute d.1/2 minute
Answer» Q.Two cars leave with a one minute gap and move with an accelaration of 0.2m/s².How long after the departure of second car the distance between them become equal to three times its initial value? a.2 minute b.3/2 minute c.1 minute d.1/2 minute

11.

Q.Two cars leave with a one minute gap and move with an accelaration of 0.2m/s2.How long after the departure of second car the distance between them become equal to three times its initial value? a.2 minute b.3/2 minute c.1 minute d.1/2 minute

Answer»

Q.Two cars leave with a one minute gap and move with an accelaration of 0.2m/s².How long after the departure of second car the distance between them become equal to three times its initial value?

a.2 minute

b.3/2 minute

c.1 minute

d.1/2 minute

Discussion

12.	a ring of radius 1mis under pure rolling on a horizontal surface with cons†an t angular speed of 5rad/s . the linear speed of a point on the horizontal diameter at any ins†an t of time with respect to point of contact with the ground is 1) 4 m/s 2) 5m/s 3) 5\surd2m/s 4)10m/
Answer» a ring of radius 1mis under pure rolling on a horizontal surface with cons†an t angular speed of 5rad/s . the linear speed of a point on the horizontal diameter at any ins†an t of time with respect to point of contact with the ground is 1) 4 m/s 2) 5m/s 3) 5\surd2m/s 4)10m/

Discussion

13.	A magnetic needle is free to rotate in a vertical plane which makes an angle of 600 with the magnetic meridian. If the needle stays in a direction making an angle of tan −1(2√3) with the horizontal, what would be the dip at that place ?
Answer» A magnetic needle is free to rotate in a vertical plane which makes an angle of $60^{0}$ with the magnetic meridian. If the needle stays in a direction making an angle of tan $^{- 1} (\frac{2}{\sqrt{3}})$ with the horizontal, what would be the dip at that place ?

Discussion

14.	The wavelength of light in two liquids x and y is 350 nm and 700 nm. The critical angle for the pair of media will be ______.
Answer» The wavelength of light in two liquids $x$ and $y$ is $350 n m$ and $700 n m$ . The critical angle for the pair of media will be ______.

Discussion

15.	19. The radius of the wheel is 70 cm. It's takes 250 revolution per minute. Find the speed of truck in km /hr.
Answer» 19. The radius of the wheel is 70 cm. It's takes 250 revolution per minute. Find the speed of truck in km /hr.

Discussion

16.	A stationary man observes that the rain strikes him at an angle 60∘ to the horizontal. When he begins to move with a velocity of 25 m/s then the drops appear to strikes him at an angle of 30∘ from horizontal the velocity of the rain drops is
Answer» A stationary man observes that the rain strikes him at an angle $60^{\circ}$ to the horizontal. When he begins to move with a velocity of $25 m/s$ then the drops appear to strikes him at an angle of $30^{\circ}$ from horizontal the velocity of the rain drops is

Discussion

17.	The value of gamma=Cp/Cv is 4/3 for an adiabatic process of an ideal gas for which the internal energy is given by dU=n(VdP+PdV),the value of n is 1.2/3 2.33.4 4.3/4
Answer» The value of gamma=Cp/Cv is 4/3 for an adiabatic process of an ideal gas for which the internal energy is given by dU=n(VdP+PdV),the value of n is 1.2/3 2.3 3.4 4.3/4

Discussion

18.	When alternating current flows through a conductor rate of flux change is =higher in inner part of conductor ,, proof
Answer» When alternating current flows through a conductor rate of flux change is =higher in inner part of conductor ,, proof

Discussion

19.	Expression of the AC voltage applied to an electric circuit is given by E = 200 sin(100t) + 200 cos(100t). Rms value of the source voltage (1)200√2V (2)100√2V(3) 200 V (4) 100 V
Answer» Expression of the AC voltage applied to an electric circuit is given by E = 200 sin(100t) + 200 cos(100t). Rms value of the source voltage (1)200√2V (2)100√2V (3) 200 V (4) 100 V

Discussion

20.	What is the relation between the Energies as shown in the figure?
Answer» What is the relation between the Energies as shown in the figure?

Discussion

21.	The potential energy for a conservative force system is given by U=ax3−bx, where a and b are constants. Choose from the options, the correct x coordinate(s) of the equilibrium position(s).
Answer» The potential energy for a conservative force system is given by $U = a x^{3} - b x$ , where $a$ and $b$ are constants. Choose from the options, the correct $x$ coordinate(s) of the equilibrium position(s).

Discussion

22.	While walking, why do we press the ground with our feet slightly slanted in the backward direction?
Answer» While walking, why do we press the ground with our feet slightly slanted in the backward direction?

Discussion

23.	100.In the network shown in figure each resistance is 1 ohm. The effective resistance between the points A and B is Options a)4/3ohm .b)3/2ohm c)7ohm .d)8/7 ohm
Answer» 100.In the network shown in figure each resistance is 1 ohm. The effective resistance between the points A and B is Options a)4/3ohm .b)3/2ohm c)7ohm .d)8/7 ohm

Discussion

24.	A source of sound and a detector are placed at the same place on ground. At t=0 , the source S is projected towards reflector with velocity v0 in vertical upward direction and reflector starts moving down with constant velocity v0. At t=0 , the vertical separation between the reflector and source is H(>v202g). The speed of sound in air is v(>>v0). Take f0 as the frequency of sound waves emitted by source. Find frequency of sound waves emitted by source at t=v02g.
Answer» A source of sound and a detector are placed at the same place on ground. At $t = 0$ , the source $S$ is projected towards reflector with velocity $v_{0}$ in vertical upward direction and reflector starts moving down with constant velocity $v_{0}$ . At $t = 0$ , the vertical separation between the reflector and source is $H (> \frac{v_{0}^{2}}{2 g})$ . The speed of sound in air is $v (>> v_{0})$ . Take $f_{0}$ as the frequency of sound waves emitted by source. Find frequency of sound waves emitted by source at $t = \frac{v_{0}}{2 g}$ .

Discussion

25.	Answer thefollowing questions:(a) Explainqualitatively on the basis of domain picture the irreversibility inthe magnetisation curve of a ferromagnet.(b) Thehysteresis loop of a soft iron piece has a much smaller area thanthat of a carbon steel piece. If the material is to go throughrepeated cycles of magnetisation, which piece will dissipate greaterheat energy?(c) ‘Asystem displaying a hysteresis loop such as a ferromagnet, is adevice for storing memory?’ Explain the meaning of thisstatement.(d) What kind offerromagnetic material is used for coating magnetic tapes in acassette player, or for building ‘memory stores’ in amodern computer?(e) A certainregion of space is to be shielded from magnetic fields.Suggest a method.
Answer» Answer the following questions: (a) Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet. (b) The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat energy? (c) ‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this statement. (d) What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer? (e) A certain region of space is to be shielded from magnetic fields. Suggest a method.

25.

Answer thefollowing questions:(a) Explainqualitatively on the basis of domain picture the irreversibility inthe magnetisation curve of a ferromagnet.(b) Thehysteresis loop of a soft iron piece has a much smaller area thanthat of a carbon steel piece. If the material is to go throughrepeated cycles of magnetisation, which piece will dissipate greaterheat energy?(c) ‘Asystem displaying a hysteresis loop such as a ferromagnet, is adevice for storing memory?’ Explain the meaning of thisstatement.(d) What kind offerromagnetic material is used for coating magnetic tapes in acassette player, or for building ‘memory stores’ in amodern computer?(e) A certainregion of space is to be shielded from magnetic fields.Suggest a method.

Answer»

Answer the
following questions:

(a) Explain
qualitatively on the basis of domain picture the irreversibility in
the magnetisation curve of a ferromagnet.

(b) The
hysteresis loop of a soft iron piece has a much smaller area than
that of a carbon steel piece. If the material is to go through
repeated cycles of magnetisation, which piece will dissipate greater
heat energy?

(c) ‘A
system displaying a hysteresis loop such as a ferromagnet, is a
device for storing memory?’ Explain the meaning of this
statement.

(d) What kind of
ferromagnetic material is used for coating magnetic tapes in a
cassette player, or for building ‘memory stores’ in a
modern computer?

(e) A certain
region of space is to be shielded from magnetic fields.

Suggest a method.

Discussion

26.	A square of side of 2.0 m is placed in a uniform magnetic field →B=2.0 T in a direction perpendicular to the plane of the square inwards. Equal current i=3.0 A is flowing in the directions shown in figure. Find the magnitude of magnetic force acting on the loop ABCD.
Answer» A square of side of $2.0 m$ is placed in a uniform magnetic field $\to B = 2.0 T$ in a direction perpendicular to the plane of the square inwards. Equal current $i = 3.0 A$ is flowing in the directions shown in figure. Find the magnitude of magnetic force acting on the loop $A B C D$ .

Discussion

27.	Four rings each of mass M and radius R are arranged as shown in the figure. The moment of inertia of the system about the axis yy' is
Answer» Four rings each of mass $M$ and radius $R$ are arranged as shown in the figure. The moment of inertia of the system about the axis yy' is

Discussion

28.	A projectile of mass m is fired from the surface of the earth at an angle θ=60∘ with the vertical. The initial speed vo is equal to √GMeRe. How high does the projectile rise? Neglect air resistance and the earth's rotation.
Answer» A projectile of mass $m$ is fired from the surface of the earth at an angle $θ = 60^{\circ}$ with the vertical. The initial speed $v_{o}$ is equal to $\sqrt{\frac{G M_{e}}{R_{e}}}$ . How high does the projectile rise $?$ Neglect air resistance and the earth's rotation.

Discussion

29.	A non-conducting sphere of radius R=5 cm has its centre at the origin O as shown and have two spherical cavities of radius r=1 cm whose centres are at (0,3 cm) and (0,−3 cm). If solid material of the sphere has uniform positive charge density ρ=1π μC-m−3, then potential at point P(4 cm,0) is
Answer» A non-conducting sphere of radius $R = 5 cm$ has its centre at the origin $O$ as shown and have two spherical cavities of radius $r = 1 cm$ whose centres are at $(0, 3 cm)$ and $(0, - 3 cm)$ . If solid material of the sphere has uniform positive charge density $ρ = \frac{1}{π} μ {C-m}^{- 3}$ , then potential at point $P (4 cm, 0)$ is

Discussion

30.	A block of mass 2 kg is projected with a velocity 6 m/s so that it climbs onto z smooth wedge of mass 1 kg. If the block does not leave the wedge, find the maximum height attained by the block. Take g=10 m/s2.
Answer» A block of mass $2 kg$ is projected with a velocity $6 m/s$ so that it climbs onto z smooth wedge of mass $1 kg$ . If the block does not leave the wedge, find the maximum height attained by the block. Take $g = 10 {m/s}^{2}$ .

Discussion

31.	If temperature increases, the surface tension of a liquid
Answer» If temperature increases, the surface tension of a liquid

31.

If temperature increases, the surface tension of a liquid

Answer»

If temperature increases, the surface tension of a liquid

Discussion

32.	Calculate the energy released by 1 g of natural uranium assuming 200 MeV is released in each fission event and that the fissionable isotope 235U has an abundance of 0.7 % by weight in natural uranium.
Answer» Calculate the energy released by 1 g of natural uranium assuming 200 MeV is released in each fission event and that the fissionable isotope $^{235} U$ has an abundance of 0.7 % by weight in natural uranium.

Discussion

33.	Three capacitor 2 μF, 3 μF and 6 μF are connected in series with 10 volt battery then charge on 3 μF capacitor is :-
Answer» Three capacitor $2 μ F$ , $3 μ F$ and $6 μ F$ are connected in series with $10 volt$ battery then charge on $3 μ F$ capacitor is :-

Discussion

34.	A rod of length L has non-uniform linear mass density given by ρ(x)=a+b(aL)2, where a and b are constants and 0≤x≤L. The value of x for the centre of mass of the rod is at:
Answer» A rod of length $L$ has non-uniform linear mass density given by $ρ (x) = a + b {(\frac{a}{L})}^{2}$ , where $a$ and $b$ are constants and $0 \leq x \leq L$ . The value of $x$ for the centre of mass of the rod is at:

Discussion

35.	A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r<R), then the correct option(s) is (are)
Answer» A spherical body of radius $R$ consists of a fluid of constant density and is in equilibrium under its own gravity. If $P (r)$ is the pressure at $r (r < R)$ , then the correct option(s) is (are)

Discussion

36.	If sinAcosA=1/2Find tanA
Answer» If sinAcosA=1/2 Find tanA

Discussion

37.	Find the radius of gyration of a circular ring of radius r about a line perpendicular to the plane of the ring and passing through one of its particles.
Answer» Find the radius of gyration of a circular ring of radius $r$ about a line perpendicular to the plane of the ring and passing through one of its particles.

Discussion

38.	Expression for time in terms of G (universal gravitational constant ), h (Planck's constant) and c (speed of light ) is proportional to
Answer» Expression for time in terms of $G$ (universal gravitational constant ), $h$ (Planck's constant) and $c$ (speed of light ) is proportional to

Discussion

39.	48. system is shown in figure.all the surfaces are smooth.rod is moved by external agent with acceleration 9m/s2 vertically downwards.force exerted on the rod by the wedge will be
Answer» 48. system is shown in figure.all the surfaces are smooth.rod is moved by external agent with acceleration 9m/s2 vertically downwards.force exerted on the rod by the wedge will be

Discussion

40.	(a) A giantrefracting telescope at an observatory has an objective lens of focallength 15 m. If an eyepiece of focal length 1.0 cm is used, what isthe angular magnification of the telescope? (b) If thistelescope is used to view the moon, what is the diameter of the imageof the moon formed by the objective lens? The diameter of the moon is3.48 × 106m, and the radius of lunar orbit is 3.8 × 108m.
Answer» (a) A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification of the telescope? (b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 10⁶ m, and the radius of lunar orbit is 3.8 × 10⁸ m.

40.

(a) A giantrefracting telescope at an observatory has an objective lens of focallength 15 m. If an eyepiece of focal length 1.0 cm is used, what isthe angular magnification of the telescope? (b) If thistelescope is used to view the moon, what is the diameter of the imageof the moon formed by the objective lens? The diameter of the moon is3.48 × 106m, and the radius of lunar orbit is 3.8 × 108m.

Answer»

(a) A giant
refracting telescope at an observatory has an objective lens of focal
length 15 m. If an eyepiece of focal length 1.0 cm is used, what is
the angular magnification of the telescope?

(b) If this
telescope is used to view the moon, what is the diameter of the image
of the moon formed by the objective lens? The diameter of the moon is
3.48 × 10⁶
m, and the radius of lunar orbit is 3.8 × 10⁸
m.

Discussion

41.	Consider the circuit shown in the figure below:The output curve of Vout versus Iin can be represented as
Answer» Consider the circuit shown in the figure below: The output curve of $V_{o u t}$ versus $I_{i n}$ can be represented as

Discussion

42.	A projectile is fired with velocity V making the angle x with the horizontal. what is the change in velocity when it is at the highest point? At the highest point the velocity of the object will be u cos(x). And intially the velocity will be u. And u = root (u²sin²x+u²cos²x). Now required ∆u= u cos x - u Here we cannot say, because the horizontal component of velocity remains constant And only the vertical component of velocity changes, that u sin x vanishes, so ∆u=u sin x. Because u is not equal to u sin x + u cos x, but is equal to the resultant of u sin x and u cos x. But in the test in the projectile chapter my answer tuemed out to be Wrong. Why?
Answer» A projectile is fired with velocity V making the angle x with the horizontal. what is the change in velocity when it is at the highest point? At the highest point the velocity of the object will be u cos(x). And intially the velocity will be u. And u = root (u²sin²x+u²cos²x). Now required ∆u= u cos x - u Here we cannot say, because the horizontal component of velocity remains constant And only the vertical component of velocity changes, that u sin x vanishes, so ∆u=u sin x. Because u is not equal to u sin x + u cos x, but is equal to the resultant of u sin x and u cos x. But in the test in the projectile chapter my answer tuemed out to be Wrong. Why?

42.

A projectile is fired with velocity V making the angle x with the horizontal. what is the change in velocity when it is at the highest point? At the highest point the velocity of the object will be u cos(x). And intially the velocity will be u. And u = root (u²sin²x+u²cos²x). Now required ∆u= u cos x - u Here we cannot say, because the horizontal component of velocity remains constant And only the vertical component of velocity changes, that u sin x vanishes, so ∆u=u sin x. Because u is not equal to u sin x + u cos x, but is equal to the resultant of u sin x and u cos x. But in the test in the projectile chapter my answer tuemed out to be Wrong. Why?

Answer»

A projectile is fired with velocity V making the angle x with the horizontal. what is the change in velocity when it is at the highest point?

At the highest point the velocity of the object will be u cos(x). And intially the velocity will be u. And u = root (u²sin²x+u²cos²x).

Now required ∆u= u cos x - u

Here we cannot say, because the horizontal component of velocity remains constant And only the vertical component of velocity changes, that u sin x vanishes, so ∆u=u sin x. Because u is not equal to u sin x + u cos x, but is equal to the resultant of u sin x and u cos x. But in the test in the projectile chapter my answer tuemed out to be Wrong. Why?

Discussion

43.	Determine the energy stored in the surface of a soap bubble of radius 2.1 cm if its surface tension is 4.5×10−2 N/m.
Answer» Determine the energy stored in the surface of a soap bubble of radius $2.1 cm$ if its surface tension is $4.5 \times 10^{- 2} N/m$ .

Discussion

44.	A nucleus of mass M emits γ-ray photon of frequency ν. The loss of internal energy by the nucleus is :Take c as the speed of electromagnetic wave.
Answer» A nucleus of mass $M$ emits $γ$ -ray photon of frequency $ν$ . The loss of internal energy by the nucleus is : Take $c$ as the speed of electromagnetic wave.

Discussion

45.	ABC is an equilateral triangle of side 2 m. If electric field E=10 NC−1 then the potential difference VA−VB is
Answer» $ABC$ is an equilateral triangle of side $2 m$ . If electric field $E = 10 {NC}^{- 1}$ then the potential difference $V_{A} - V_{B}$ is

Discussion

46.	A ring having linear mass density 5 kg/m and radius 0.5 m is rotated about the axis passing through it's centre and perpendicular to it's plane. Find the moment of inertia (MI) of the ring about the required axis.
Answer» A ring having linear mass density $5 kg/m$ and radius $0.5 m$ is rotated about the axis passing through it's centre and perpendicular to it's plane. Find the moment of inertia ( $MI$ ) of the ring about the required axis.

Discussion

47.	A ball is projected from the ground with speed u at an angle α with horizontal. It collides with a wall at a dis†an ce 'a' from the point of projection and returns to its original position Find the coefficient of restitution between the ball and the wall
Answer» A ball is projected from the ground with speed u at an angle α with horizontal. It collides with a wall at a dis†an ce 'a' from the point of projection and returns to its original position Find the coefficient of restitution between the ball and the wall

Discussion

48.	Figure shows a platform on which a man of mass M is standing and holding a string passing over a system of ideal pulleys. Another mass m is hanging as shown in figure. Consider the entire system to be in equilibrium. Take M=5m, find the force exerted by the platform on man.
Answer» Figure shows a platform on which a man of mass $M$ is standing and holding a string passing over a system of ideal pulleys. Another mass $m$ is hanging as shown in figure. Consider the entire system to be in equilibrium. Take $M = 5 m$ , find the force exerted by the platform on man.

Discussion

49.	A force acts on a 1 kg particle such that position of particle as a function of time is given by x=2t2−4, where ′x′ in m and t is in seconds. The work done during initial 4 seconds is
Answer» A force acts on a $1 kg$ particle such that position of particle as a function of time is given by $x = 2 t^{2} - 4$ , where $^{'} x^{'}$ in $m$ and $t$ is in $seconds$ . The work done during initial $4$ seconds is

Discussion

50.	Consider the following heating curve for water and match column 1 with column 2.Column 1Column 2(a) Melting(i) CD(b) Vaporization(ii) BC(c) Boiling(iii) DE
Answer» Consider the following heating curve for water and match column $1$ with column $2$ . $\begin{matrix} Column 1 & Column 2 (a) Melting & (i) C D (b) Vaporization & (i i) B C (c) Boiling & (i i i) D E \end{matrix}$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

39.a massless beam of length 5 metre is placed on two wedges A and B. If three forces 3kN, 4kN and 5kN are applied on the beam shown in the figure, then find normal reaction at A and B.

A small square loop of side l is placed inside a large square loop of wire of side L(L>l).The loop are coplanar and thier centre coincide.The mutual inductance of the system isproportional to a).l/L b).l/L c).L/l d).L/l.

86.An object of mass m projected with velocity v at an angle Y with horizontal. At highest point it explodes in three fragments in ratio1:1:2 such that 1st part retraces its path ,2nd part just fall dowm . The 3rd part will fall on ground at what distance from point of projection.

The speed of electromagnetic wave in a hypothetical medium (whose dielectric constant is 1.5 and relative magnetic permeability is 6) isOptions:0.5 × 108 m/sWrong 2 × 108 m/s3 × 108 m/sShould have chosen 1 × 108 m/s.kindly explain

the velocity of sound in air is V_{s .{}}if the density of the air is increase d by 4 times then the new velocity will be

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

Transitions between three energy levels in a particular atom give rise to three spectral lines of wavelengths, in increasing magnitudes, λ1,λ2 and λ3. Which one of the following equations correctly relates λ1,λ2, and λ3?

Which of the following options represent the correct object image combination w.r.t. a plane mirror inclined at an angle of 45∘ to the horizontal?

Two soap bubbles each of radius r are touching each other. The raditus of curvature of the common surfecewill be:

The positive, negative and zero sequence impedance of 3-ϕ generator are 0.4 pu, 0.3 and 0.2 pu respectively. For a line to line fault with fault impedance Zf and fault current is If1=0.2If, where If is the fault current with zero fault impedance, then value of Zf will be ______pu.2.8

Q.Two cars leave with a one minute gap and move with an accelaration of 0.2m/s2.How long after the departure of second car the distance between them become equal to three times its initial value? a.2 minute b.3/2 minute c.1 minute d.1/2 minute

a ring of radius 1mis under pure rolling on a horizontal surface with cons†an t angular speed of 5rad/s . the linear speed of a point on the horizontal diameter at any ins†an t of time with respect to point of contact with the ground is 1) 4 m/s 2) 5m/s 3) 5\surd2m/s 4)10m/

A magnetic needle is free to rotate in a vertical plane which makes an angle of 600 with the magnetic meridian. If the needle stays in a direction making an angle of tan −1(2√3) with the horizontal, what would be the dip at that place ?

The wavelength of light in two liquids x and y is 350 nm and 700 nm. The critical angle for the pair of media will be ______.

19. The radius of the wheel is 70 cm. It's takes 250 revolution per minute. Find the speed of truck in km /hr.

A stationary man observes that the rain strikes him at an angle 60∘ to the horizontal. When he begins to move with a velocity of 25 m/s then the drops appear to strikes him at an angle of 30∘ from horizontal the velocity of the rain drops is

The value of gamma=Cp/Cv is 4/3 for an adiabatic process of an ideal gas for which the internal energy is given by dU=n(VdP+PdV),the value of n is 1.2/3 2.33.4 4.3/4

When alternating current flows through a conductor rate of flux change is =higher in inner part of conductor ,, proof

Expression of the AC voltage applied to an electric circuit is given by E = 200 sin(100t) + 200 cos(100t). Rms value of the source voltage (1)200√2V (2)100√2V(3) 200 V (4) 100 V

What is the relation between the Energies as shown in the figure?

The potential energy for a conservative force system is given by U=ax3−bx, where a and b are constants. Choose from the options, the correct x coordinate(s) of the equilibrium position(s).

While walking, why do we press the ground with our feet slightly slanted in the backward direction?

100.In the network shown in figure each resistance is 1 ohm. The effective resistance between the points A and B is Options a)4/3ohm .b)3/2ohm c)7ohm .d)8/7 ohm

A square of side of 2.0 m is placed in a uniform magnetic field →B=2.0 T in a direction perpendicular to the plane of the square inwards. Equal current i=3.0 A is flowing in the directions shown in figure. Find the magnitude of magnetic force acting on the loop ABCD.

Four rings each of mass M and radius R are arranged as shown in the figure. The moment of inertia of the system about the axis yy' is

A projectile of mass m is fired from the surface of the earth at an angle θ=60∘ with the vertical. The initial speed vo is equal to √GMeRe. How high does the projectile rise? Neglect air resistance and the earth's rotation.

A non-conducting sphere of radius R=5 cm has its centre at the origin O as shown and have two spherical cavities of radius r=1 cm whose centres are at (0,3 cm) and (0,−3 cm). If solid material of the sphere has uniform positive charge density ρ=1π μC-m−3, then potential at point P(4 cm,0) is

A block of mass 2 kg is projected with a velocity 6 m/s so that it climbs onto z smooth wedge of mass 1 kg. If the block does not leave the wedge, find the maximum height attained by the block. Take g=10 m/s2.

If temperature increases, the surface tension of a liquid

Calculate the energy released by 1 g of natural uranium assuming 200 MeV is released in each fission event and that the fissionable isotope 235U has an abundance of 0.7 % by weight in natural uranium.

Three capacitor 2 μF, 3 μF and 6 μF are connected in series with 10 volt battery then charge on 3 μF capacitor is :-

A rod of length L has non-uniform linear mass density given by ρ(x)=a+b(aL)2, where a and b are constants and 0≤x≤L. The value of x for the centre of mass of the rod is at:

A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r&lt;R), then the correct option(s) is (are)

If sinAcosA=1/2Find tanA

Find the radius of gyration of a circular ring of radius r about a line perpendicular to the plane of the ring and passing through one of its particles.

Expression for time in terms of G (universal gravitational constant ), h (Planck's constant) and c (speed of light ) is proportional to

48. system is shown in figure.all the surfaces are smooth.rod is moved by external agent with acceleration 9m/s2 vertically downwards.force exerted on the rod by the wedge will be

Consider the circuit shown in the figure below:The output curve of Vout versus Iin can be represented as

Determine the energy stored in the surface of a soap bubble of radius 2.1 cm if its surface tension is 4.5×10−2 N/m.

A nucleus of mass M emits γ-ray photon of frequency ν. The loss of internal energy by the nucleus is :Take c as the speed of electromagnetic wave.

ABC is an equilateral triangle of side 2 m. If electric field E=10 NC−1 then the potential difference VA−VB is

A ring having linear mass density 5 kg/m and radius 0.5 m is rotated about the axis passing through it's centre and perpendicular to it's plane. Find the moment of inertia (MI) of the ring about the required axis.

A ball is projected from the ground with speed u at an angle α with horizontal. It collides with a wall at a dis†an ce 'a' from the point of projection and returns to its original position Find the coefficient of restitution between the ball and the wall

Figure shows a platform on which a man of mass M is standing and holding a string passing over a system of ideal pulleys. Another mass m is hanging as shown in figure. Consider the entire system to be in equilibrium. Take M=5m, find the force exerted by the platform on man.

A force acts on a 1 kg particle such that position of particle as a function of time is given by x=2t2−4, where ′x′ in m and t is in seconds. The work done during initial 4 seconds is

Consider the following heating curve for water and match column 1 with column 2.Column 1Column 2(a) Melting(i) CD(b) Vaporization(ii) BC(c) Boiling(iii) DE

A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r<R), then the correct option(s) is (are)