50278 + Interview Questions in Physics

1.	A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of twice the radius, then the new mean drift velocity is
Answer» A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of twice the radius, then the new mean drift velocity is

Discussion

2.	What is the method of charging
Answer» What is the method of charging

Discussion

3.	Two masses m and M are connected by a light string passing over a smooth pulley. When set free, m moves up by 1.4 m in 2 s. The ratio mM is (g=9.8 ms−2)
Answer» Two masses $m$ and $M$ are connected by a light string passing over a smooth pulley. When set free, $m$ moves up by $1.4 m$ in $2 s$ . The ratio $\frac{m}{M}$ is $(g = 9.8 {ms}^{- 2})$

Discussion

4.	When two particles have charge q1 and q2 are kept at a certain distance, they exert a force F on each other. If the distance between the two particles becomes n times and the charge becomes m times then what will be the new force in terms of initial force?
Answer» When two particles have charge q1 and q2 are kept at a certain distance, they exert a force F on each other. If the distance between the two particles becomes n times and the charge becomes m times then what will be the new force in terms of initial force?

Discussion

5.	A circular disc of radius R is rotating about its axis with uniform angular velocity w rad/sec. The angle subtended at the centre between two points p and q on the circumference is 120degree. Find the change in magnitude of relative velocity of point p relative to q
Answer» A circular disc of radius R is rotating about its axis with uniform angular velocity w rad/sec. The angle subtended at the centre between two points p and q on the circumference is 120degree. Find the change in magnitude of relative velocity of point p relative to q

Discussion

6.

A musical instrument is made using four different metal strings. 1,2,3 and 4 with mass per unit length μ,2μ,3μ and 4μ respectively. The instrument is played by vibrating the strings by varying the free length in between the range L0 and 2L0. It is found that in string- 1 (μ) at free length L0 and tension T0 the fundamental mode frequency is f0. List-I gives the above four strings while List-II lists the magnitude of some quantity. List-I List-II(i)String-1(μ)(P)1(ii)String-2(2μ)(Q)1/2(iii)String- 3(3μ)(R)1/√2(iv)String-4(4μ)(S)1/√3 (T)3/16 (U)1/16 The length of the strings 1,2,3 and 4 are kept fixed at L0,3L02,5L04 and 7L04 respectively.Strings 1,2,3 and 4 are vibrated at their 1 st, 3 rd, 5 th, and 14 th harmonics, respectively such that all the strings have same frequency. The correct match for the tension in the four strings in the units of T0 will be,

Answer»

A musical instrument is made using four different metal strings. $1, 2, 3$ and 4 with mass per unit length $μ, 2 μ, 3 μ$ and $4 μ$ respectively. The instrument is played by vibrating the strings by varying the free length in between the range $L_{0}$ and $2 L_{0}$ . It is found that in string- 1 $(μ)$ at free length $L_{0}$ and tension $T_{0}$ the fundamental mode frequency is $f_{0}$ . List-I gives the above four strings while List-II lists the magnitude of some quantity.

	List-I		List-II
(i)	String-1 $(μ)$	(P)	$1$
(ii)	String-2 $(2 μ)$	(Q)	$1 / 2$
(iii)	String- 3 $(3 μ)$	(R)	$1 / \sqrt{2}$
(iv)	String-4 $(4 μ)$	(S)	$1 / \sqrt{3}$
		(T)	$3 / 16$
		(U)	$1 / 16$

The length of the strings $1, 2, 3$ and 4 are kept fixed at $L_{0}, \frac{3 L_{0}}{2}, \frac{5 L_{0}}{4}$ and $\frac{7 L_{0}}{4}$ respectively.

Strings $1, 2, 3$ and 4 are vibrated at their 1 st, 3 rd, 5 th, and 14 th harmonics, respectively such that all the strings have same frequency. The correct match for the tension in the four strings in the units of $T_{0}$ will be,

Discussion

7.	The original area of a metal plate is 110 cm2 at 20 ∘C. If β for the metal is 0.000036/∘C, then find the area of the plate at 200∘C.
Answer» The original area of a metal plate is $110 {cm}^{2}$ at $20^{\circ} C$ . If $β$ for the metal is $0.000036 /^{\circ} C,$ then find the area of the plate at $200^{\circ} C$ .

Discussion

8.	The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is
Answer» The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

Discussion

9.	The variation of potential energy of harmonic oscillator is as shown in figure. The spring constant is N/m.
Answer» The variation of potential energy of harmonic oscillator is as shown in figure. The spring constant is N/m.

Discussion

10.	when a same force is applied on two different objects.it produces accelerations of 4m/sec2 and 6m/sec2.in these objects,if same force is applied on the combination of these objects,calculate acceleration of combination
Answer» when a same force is applied on two different objects.it produces accelerations of 4m/sec2 and 6m/sec2.in these objects,if same force is applied on the combination of these objects,calculate acceleration of combination

Discussion

11.	It is easier to pull a lawn mover than to push it.Explain why
Answer» It is easier to pull a lawn mover than to push it.Explain why

Discussion

12.	Consider a helium (He) atom that absorbs a photon of wavelength 330 nm. The change in the velocity(in cm s–1 of He atom after the photon absorption isUse: Planck constant =6.6×10–34 J s, Avogadro number =6×1023 mol–1,Molar mass of He=4 g mol–1).
Answer» Consider a helium $(H e)$ atom that absorbs a photon of wavelength $330 n m$ . The change in the velocity (in $c m s^{- 1}$ of $H e$ atom after the photon absorption is Use: Planck constant $= 6.6 \times 10^{- 34} J s$ , Avogadro number $= 6 \times 10^{23} m o l^{- 1}$ , Molar mass of $H e = 4 g m o l^{- 1}$ ) .

Discussion

13.	A small sphere of radius R held against the inner surface of a smooth sphericalshell of radius 6R as shown in figure. The masses of the shell and small spheresare 4M and M respectively. This arrangement is placed on a smooth horizontaltable. The small sphere is now released. The x-coordinate of the centre of theshell when the smaller sphere reaches the other extreme position is:(A) R(C) 3R(B) 2R(D) 4RX
Answer» A small sphere of radius R held against the inner surface of a smooth sphericalshell of radius 6R as shown in figure. The masses of the shell and small spheresare 4M and M respectively. This arrangement is placed on a smooth horizontaltable. The small sphere is now released. The x-coordinate of the centre of theshell when the smaller sphere reaches the other extreme position is:(A) R(C) 3R(B) 2R(D) 4RX

Discussion

14.	Why energy is directly proportional to (amplitude)2 . explain it
Answer» Why energy is directly proportional to (amplitude)². explain it

Discussion

15.	A small particle of mass m=2 kg moving with constant horizontal velocity u=10 ms−1 strikes a wedge shaped block of mass M=4 kg placed on the smooth surface as shown in figure. After collision, the particle starts moving up the inclined plane. Find the velocity of the wedge immediately after collision-
Answer» A small particle of mass $m = 2 kg$ moving with constant horizontal velocity $u = 10 {ms}^{- 1}$ strikes a wedge shaped block of mass $M = 4 kg$ placed on the smooth surface as shown in figure. After collision, the particle starts moving up the inclined plane. Find the velocity of the wedge immediately after collision-

Discussion

16.	a 6v battery is connected to the terminals of a 3m long wire of uniform thickness and resis†an ce of 100 ohm along with another 100 ohm resistor in series the difference of potentials between two points on the wire seperated by a dis†an ce of 50 cm will b
Answer» a 6v battery is connected to the terminals of a 3m long wire of uniform thickness and resis†an ce of 100 ohm along with another 100 ohm resistor in series the difference of potentials between two points on the wire seperated by a dis†an ce of 50 cm will b

Discussion

17.	37.A resistor R1 dissipates the PowerPC when connected to a certain generator. If the resistor R2 is put in series with R1 the power dissipated by R1 options 1) decreases 2)increases 3)remains the same 4)any of the above depending upon the relative values of R1 and R2
Answer» 37.A resistor R1 dissipates the PowerPC when connected to a certain generator. If the resistor R2 is put in series with R1 the power dissipated by R1 options 1) decreases 2)increases 3)remains the same 4)any of the above depending upon the relative values of R1 and R2

Discussion

18.	The load versus elongation graph for four wires of same length and the same material is shown in figure. The thinnest wire is represented by line
Answer» The load versus elongation graph for four wires of same length and the same material is shown in figure. The thinnest wire is represented by line

Discussion

19.	The spectral emissive power Eλ for a body at temperature T1 is plotted against the wavelength and the area under the curve is found to be A. At a different temperature T2 the area is found to be 9A. Then λ1λ2=
Answer» The spectral emissive power $E_{λ}$ for a body at temperature $T_{1}$ is plotted against the wavelength and the area under the curve is found to be $A$ . At a different temperature $T_{2}$ the area is found to be $9 A$ . Then $\frac{λ_{1}}{λ_{2}} =$

Discussion

20.	.A spring is initially compressed by X and then.it is further compressed by Y. Find out the workdone during the latter compression. If springconstant is K.
Answer» .A spring is initially compressed by X and then.it is further compressed by Y. Find out the workdone during the latter compression. If springconstant is K.

Discussion

21.	In case of projectile motion, what is the acceleration along the horizontal and vertical?
Answer» In case of projectile motion, what is the acceleration along the horizontal and vertical?

Discussion

22.	The magnifications produced by a convex lens for two different positions of an object are m1 and m2 respectively (m1>m2). If 'd' is the distance of separation between the two positions of the object then the focal length of the lens is? 1)m1m2 2)d/m1-m2 3)d12/m1-m2 4)d/m1-m2
Answer» The magnifications produced by a convex lens for two different positions of an object are m1 and m2 respectively (m1>m2). If 'd' is the distance of separation between the two positions of the object then the focal length of the lens is? 1)m1m2 2)d/m1-m2 3)d12/m1-m2 4)d/m1-m2

Discussion

23.	A ball dropped from a balloon at rest cleartower 81 m high during the last quarter secondof its journey. Find the height of the balloonand the velocity of the body when it reachesthe ground.8.
Answer» A ball dropped from a balloon at rest cleartower 81 m high during the last quarter secondof its journey. Find the height of the balloonand the velocity of the body when it reachesthe ground.8.

Discussion

24.	A force F acts at the end q of a uniform rod placed at rest on a smooth horizontal plane ratio of magnitude of initial acceleration of the point P and q is 1:k then value of k
Answer» A force F acts at the end q of a uniform rod placed at rest on a smooth horizontal plane ratio of magnitude of initial acceleration of the point P and q is 1:k then value of k

Discussion

25.	If linear density of a rod of length 3 m varies as λ=2+x, then the position of the centre of mass of the rod is
Answer» If linear density of a rod of length 3 m varies as $λ = 2 + x$ , then the position of the centre of mass of the rod is

Discussion

26.	Figure shows two small blocks A and B placed on a smooth horizontal surface. They start moving from the same line with force 2F and F respectively acting on the blocks. Their momentum and kinetic energies at the instants of crossing the finishing line as shown in figure are pA,pB and KA,KB. Then, choose the correct option.
Answer» Figure shows two small blocks $A$ and $B$ placed on a smooth horizontal surface. They start moving from the same line with force $2 F$ and $F$ respectively acting on the blocks. Their momentum and kinetic energies at the instants of crossing the finishing line as shown in figure are $p_{A}, p_{B}$ and $K_{A}, K_{B}$ . Then, choose the correct option.

Discussion

27.	In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be
Answer» In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

Discussion

28.	What is meant by a positive work, negative work and zero work?
Answer» What is meant by a positive work, negative work and zero work?

Discussion

29.	The maximum vertical distance through which a full dressed astronaut can jump on the earth is 0.5m . Estimate the maximum vertical distance through which he can jumpnon the moon which has a mean density 2/3rd that of the earth and radius one quarter that of the earth.
Answer» The maximum vertical distance through which a full dressed astronaut can jump on the earth is 0.5m . Estimate the maximum vertical distance through which he can jumpnon the moon which has a mean density 2/3rd that of the earth and radius one quarter that of the earth.

Discussion

30.	The density of a nucleus in which mass of each nucleon is 1.6710 to the power of minus 27kg and R^°=1.410 to the power of minus 15m is
Answer» The density of a nucleus in which mass of each nucleon is 1.6710 to the power of minus 27kg and R^°=1.410 to the power of minus 15m is

Discussion

31.	Two balls of masses 2 kg and 4 kg after the collision are moving with speeds 4 m/s and 2 m/s as shown in figure. Find the impulse of reformation for the 4 kg ball.
Answer» Two balls of masses $2 kg$ and $4 kg$ after the collision are moving with speeds $4 m/s$ and $2 m/s$ as shown in figure. Find the impulse of reformation for the $4 kg$ ball.

Discussion

32.	65.A wire of resistance is 3.1 at 30^0C and 4.5 at 100^0C the temperature coefficient of resistance to the wire is approximately
Answer» 65.A wire of resistance is 3.1 at 30^0C and 4.5 at 100^0C the temperature coefficient of resistance to the wire is approximately

Discussion

33.	ntif the pressure of N2 and H2 mixture in closed vessel is 100 atm and 20% of the mixture reacts then pressure at same temp would be.n
Answer» ntif the pressure of N2 and H2 mixture in closed vessel is 100 atm and 20% of the mixture reacts then pressure at same temp would be.n

Discussion

34.	A loop ABCDEFA of straight edges has six corner points A(0,0,0), B(5,0,0), C(5,5,0), D(0,5,0), E(0,5,5), F(0,0,5). The magnetic field in this region is →B = (3^i+4^k) T. The quantity of flux through the loop ABCDEFA (in Wb) is
Answer» A loop $A B C D E F A$ of straight edges has six corner points A(0,0,0), B(5,0,0), C(5,5,0), D(0,5,0), E(0,5,5), F(0,0,5). The magnetic field in this region is $\to B$ = $(3^i + 4^k) T$ . The quantity of flux through the loop $A B C D E F A$ (in $W b$ ) is

Discussion

35.	In the given figure AB=BC=CA=L and DE=EF=FD=L2. Resistance per unit length of wire to make structure is λ and resistance of wire connecting battery ε to end A and C is zero. Reading of Ammeter is
Answer» In the given figure AB=BC=CA=L and DE=EF=FD= $\frac{L}{2}$ . Resistance per unit length of wire to make structure is $λ$ and resistance of wire connecting battery $ε$ to end A and C is zero. Reading of Ammeter is

Discussion

36.	The potential energy of a certain particle is given by U=12(x2−z2). The force on it is:
Answer» The potential energy of a certain particle is given by $U = \frac{1}{2} (x^{2} - z^{2})$ . The force on it is:

Discussion

37.	A thin film (μ=1.6) of thickness 10−3 mm is introduced in the path of the one of the two interfering beams. The central fringe moves to a position occupied by the 10th bright fringe earlier. The wavelength of light is:
Answer» A thin film $(μ = 1.6)$ of thickness $10^{- 3}$ mm is introduced in the path of the one of the two interfering beams. The central fringe moves to a position occupied by the $10^{t h}$ bright fringe earlier. The wavelength of light is:

Discussion

38.	A stretched wire fixed at both ends is oscillating in the third overtone mode. Equation of the transverse stationary wave produced in this wire is y=Asin(6πx)sin(20πt) (x is in m and t in seconds). Find the length of the wire.
Answer» A stretched wire fixed at both ends is oscillating in the third overtone mode. Equation of the transverse stationary wave produced in this wire is $y = A sin (6 π x) sin (20 π t)$ ( $x$ is in $m$ and $t$ in $seconds$ ). Find the length of the wire.

Discussion

39.	6. Four resistances each of 2 Ω are connected in the shape of a square.a. Find the resistance between two adjacent sides of the square.b. Find the resistance between opposite sides of the square.
Answer» 6. Four resistances each of 2 Ω are connected in the shape of a square. a. Find the resistance between two adjacent sides of the square. b. Find the resistance between opposite sides of the square.

Discussion

40.	A sinusoidal voltage of peak value 200 volt is connected to a diode and resistor R in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to R then rms voltage (in volt) across R is approximately -
Answer» A sinusoidal voltage of peak value $200 volt$ is connected to a diode and resistor $R$ in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to $R$ then rms voltage (in volt) across $R$ is approximately -

Discussion

41.	what is wave equation ?Asin (wt-kx+fi) ORAsin (kx +/-wt +/- fi)
Answer» what is wave equation ? Asin (wt-kx+fi) OR Asin (kx +/-wt +/- fi)

Discussion

42.	A body is dropped from a height 100m high cliff and at the same time another body is thrown from the ground with 25m/s velocity in upward direction.Where the 2 will meet?take g=10m/
Answer» A body is dropped from a height 100m high cliff and at the same time another body is thrown from the ground with 25m/s velocity in upward direction.Where the 2 will meet?take g=10m/

Discussion

43.	A cube floats in water with (14)th part outside the surface of water. If it floats in another liquid of relative density 43 with xth part outside the liquid, then the value of x is
Answer» A cube floats in water with ${(\frac{1}{4})}^{th}$ part outside the surface of water. If it floats in another liquid of relative density $\frac{4}{3}$ with $x^{t h}$ part outside the liquid, then the value of $x$ is

Discussion

44.	14. Ball A is thrown up vertically with a speed 10m/s . At the same instant another ball B is released from rest at height h . At time t , the speed of A relative to B is ?
Answer» 14. Ball A is thrown up vertically with a speed 10m/s . At the same instant another ball B is released from rest at height h . At time t , the speed of A relative to B is ?

Discussion

45.	Explain how ucosθ is the horizontal component and usinθ the vertical component when a projectile is projected at an angle θ from the horizontal.
Answer» Explain how $u cos θ$ is the horizontal component and $u sin θ$ the vertical component when a projectile is projected at an angle $θ$ from the horizontal.

Discussion

46.	179 if momentum is increased by 200% then what% change in KE?
Answer» 179 if momentum is increased by 200% then what% change in KE?

Discussion

47.	The equations of motion of a projectile are given by x=36t metres and 2y=96t−9.8t2 metres. The angle of projection is
Answer» The equations of motion of a projectile are given by $x = 36 t$ metres and $2 y = 96 t - 9.8 t^{2}$ metres. The angle of projection is

Discussion

48.	If photon having a wavelength of 6.2 nm was allowed to strike a metal plate having a work function of 50 eV then the uncertainity in wavelength of the emitted electron with KEmax is x×10−14 m. If the uncertainity in the momentum is 13.24×10−28 kgms. Then value of x will be:
Answer» If photon having a wavelength of $6.2 n m$ was allowed to strike a metal plate having a work function of $50 e V$ then the uncertainity in wavelength of the emitted electron with $K E_{m a x} i s x \times 10^{- 14} m .$ If the uncertainity in the momentum is $13.24 \times 10^{- 28} k g \frac{m}{s} .$ Then value of x will be:

Discussion

49.	What happens to K.E. of a body when 3/4 th of mass is removed and its velocity is doubled?
Answer» What happens to K.E. of a body when 3/4 th of mass is removed and its velocity is doubled?

Discussion

50.	4.A grinder motor is designed to operate at a current of 5 A and at a p.d. of 200 V. What resistance must be connected in series with the motor so as to maintain the rated current when it is operated on a 220 V line?
Answer» 4.A grinder motor is designed to operate at a current of 5 A and at a p.d. of 200 V. What resistance must be connected in series with the motor so as to maintain the rated current when it is operated on a 220 V line?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of twice the radius, then the new mean drift velocity is

What is the method of charging

Two masses m and M are connected by a light string passing over a smooth pulley. When set free, m moves up by 1.4 m in 2 s. The ratio mM is (g=9.8 ms−2)

When two particles have charge q1 and q2 are kept at a certain distance, they exert a force F on each other. If the distance between the two particles becomes n times and the charge becomes m times then what will be the new force in terms of initial force?

A circular disc of radius R is rotating about its axis with uniform angular velocity w rad/sec. The angle subtended at the centre between two points p and q on the circumference is 120degree. Find the change in magnitude of relative velocity of point p relative to q

The original area of a metal plate is 110 cm2 at 20 ∘C. If β for the metal is 0.000036/∘C, then find the area of the plate at 200∘C.

The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

The variation of potential energy of harmonic oscillator is as shown in figure. The spring constant is N/m.

when a same force is applied on two different objects.it produces accelerations of 4m/sec2 and 6m/sec2.in these objects,if same force is applied on the combination of these objects,calculate acceleration of combination

It is easier to pull a lawn mover than to push it.Explain why

Consider a helium (He) atom that absorbs a photon of wavelength 330 nm. The change in the velocity(in cm s–1 of He atom after the photon absorption isUse: Planck constant =6.6×10–34 J s, Avogadro number =6×1023 mol–1,Molar mass of He=4 g mol–1).

Why energy is directly proportional to (amplitude)2 . explain it

a 6v battery is connected to the terminals of a 3m long wire of uniform thickness and resis†an ce of 100 ohm along with another 100 ohm resistor in series the difference of potentials between two points on the wire seperated by a dis†an ce of 50 cm will b

37.A resistor R1 dissipates the PowerPC when connected to a certain generator. If the resistor R2 is put in series with R1 the power dissipated by R1 options 1) decreases 2)increases 3)remains the same 4)any of the above depending upon the relative values of R1 and R2

The load versus elongation graph for four wires of same length and the same material is shown in figure. The thinnest wire is represented by line

The spectral emissive power Eλ for a body at temperature T1 is plotted against the wavelength and the area under the curve is found to be A. At a different temperature T2 the area is found to be 9A. Then λ1λ2=

.A spring is initially compressed by X and then.it is further compressed by Y. Find out the workdone during the latter compression. If springconstant is K.

In case of projectile motion, what is the acceleration along the horizontal and vertical?

The magnifications produced by a convex lens for two different positions of an object are m1 and m2 respectively (m1>m2). If 'd' is the distance of separation between the two positions of the object then the focal length of the lens is? 1)m1m2 2)d/m1-m2 3)d12/m1-m2 4)d/m1-m2

A ball dropped from a balloon at rest cleartower 81 m high during the last quarter secondof its journey. Find the height of the balloonand the velocity of the body when it reachesthe ground.8.

A force F acts at the end q of a uniform rod placed at rest on a smooth horizontal plane ratio of magnitude of initial acceleration of the point P and q is 1:k then value of k

If linear density of a rod of length 3 m varies as λ=2+x, then the position of the centre of mass of the rod is

In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

What is meant by a positive work, negative work and zero work?

The maximum vertical distance through which a full dressed astronaut can jump on the earth is 0.5m . Estimate the maximum vertical distance through which he can jumpnon the moon which has a mean density 2/3rd that of the earth and radius one quarter that of the earth.

The density of a nucleus in which mass of each nucleon is 1.6710 to the power of minus 27kg and R^°=1.410 to the power of minus 15m is

Two balls of masses 2 kg and 4 kg after the collision are moving with speeds 4 m/s and 2 m/s as shown in figure. Find the impulse of reformation for the 4 kg ball.

65.A wire of resistance is 3.1 at 30^0C and 4.5 at 100^0C the temperature coefficient of resistance to the wire is approximately

ntif the pressure of N2 and H2 mixture in closed vessel is 100 atm and 20% of the mixture reacts then pressure at same temp would be.n

A loop ABCDEFA of straight edges has six corner points A(0,0,0), B(5,0,0), C(5,5,0), D(0,5,0), E(0,5,5), F(0,0,5). The magnetic field in this region is →B = (3^i+4^k) T. The quantity of flux through the loop ABCDEFA (in Wb) is

In the given figure AB=BC=CA=L and DE=EF=FD=L2. Resistance per unit length of wire to make structure is λ and resistance of wire connecting battery ε to end A and C is zero. Reading of Ammeter is

The potential energy of a certain particle is given by U=12(x2−z2). The force on it is:

A thin film (μ=1.6) of thickness 10−3 mm is introduced in the path of the one of the two interfering beams. The central fringe moves to a position occupied by the 10th bright fringe earlier. The wavelength of light is:

A stretched wire fixed at both ends is oscillating in the third overtone mode. Equation of the transverse stationary wave produced in this wire is y=Asin(6πx)sin(20πt) (x is in m and t in seconds). Find the length of the wire.

6. Four resistances each of 2 Ω are connected in the shape of a square.a. Find the resistance between two adjacent sides of the square.b. Find the resistance between opposite sides of the square.

A sinusoidal voltage of peak value 200 volt is connected to a diode and resistor R in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to R then rms voltage (in volt) across R is approximately -

what is wave equation ?Asin (wt-kx+fi) ORAsin (kx +/-wt +/- fi)

A body is dropped from a height 100m high cliff and at the same time another body is thrown from the ground with 25m/s velocity in upward direction.Where the 2 will meet?take g=10m/

A cube floats in water with (14)th part outside the surface of water. If it floats in another liquid of relative density 43 with xth part outside the liquid, then the value of x is

14. Ball A is thrown up vertically with a speed 10m/s . At the same instant another ball B is released from rest at height h . At time t , the speed of A relative to B is ?

Explain how ucosθ is the horizontal component and usinθ the vertical component when a projectile is projected at an angle θ from the horizontal.

179 if momentum is increased by 200% then what% change in KE?

The equations of motion of a projectile are given by x=36t metres and 2y=96t−9.8t2 metres. The angle of projection is

If photon having a wavelength of 6.2 nm was allowed to strike a metal plate having a work function of 50 eV then the uncertainity in wavelength of the emitted electron with KEmax is x×10−14 m. If the uncertainity in the momentum is 13.24×10−28 kgms. Then value of x will be:

What happens to K.E. of a body when 3/4 th of mass is removed and its velocity is doubled?

4.A grinder motor is designed to operate at a current of 5 A and at a p.d. of 200 V. What resistance must be connected in series with the motor so as to maintain the rated current when it is operated on a 220 V line?