50278 + Interview Questions in Physics

1.	A person standing on the top of a cliff, 171 ft high, has to throw a packet to his friend standing on the ground 228 ft horizontally away. If he throws the packet directly aiming at the friend with a speed of 15.0 ft/s, how short will the packet fall? Give g = 32 ft/s2.
Answer» A person standing on the top of a cliff, 171 ft high, has to throw a packet to his friend standing on the ground 228 ft horizontally away. If he throws the packet directly aiming at the friend with a speed of 15.0 ft/s, how short will the packet fall? Give g = 32 ft/s2.

Discussion

2.	Two unequal masses, 1 kg on the left and 2 kg on the right are connected on two sides of a light string passing over a light and smooth pulley as shown in figure. The system is released from rest. The larger mass is stopped after 1.0 second after the system is set into motion, and immediately released again. The time elapsed before the string is tight again is (g=10 m/s2)
Answer» Two unequal masses, $1 k g$ on the left and $2 k g$ on the right are connected on two sides of a light string passing over a light and smooth pulley as shown in figure. The system is released from rest. The larger mass is stopped after $1.0$ second after the system is set into motion, and immediately released again. The time elapsed before the string is tight again is $(g = 10 {m/s}^{2})$

Discussion

3.	Figure shows a rod PQ of length 20 cm and mass 200 g suspended through a fixed point O by two threads of length 20 cm each. A magnetic field of strength 0.5 T exists in the vicinity of the wire PQ as shown in the figure. The wires connecting PQ with the battery are loose and exert no force on PQ. A current of 2 A is established when the switch S is closed. The tension in the threads is
Answer» Figure shows a rod PQ of length 20 cm and mass 200 g suspended through a fixed point O by two threads of length 20 cm each. A magnetic field of strength 0.5 T exists in the vicinity of the wire PQ as shown in the figure. The wires connecting PQ with the battery are loose and exert no force on PQ. A current of 2 A is established when the switch S is closed. The tension in the threads is

Discussion

4.	A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm, find the work to be done against the gravitational force between them to take the particle for away from the sphere:-(G=6.67×10−11Nm2kg2)
Answer» A particle of mass $10 g$ is kept on the surface of a uniform sphere of mass $100 kg$ and radius $10 cm$ , find the work to be done against the gravitational force between them to take the particle for away from the sphere:- $(G = 6.67 \times 10^{- 11} \frac{N m^{2}}{k g^{2}})$

Discussion

5.	At what value of angle Q, the distance between two consecutive planes in a crystal is equal to the wavelength of the X-rays used (assure 1st order diffractions)
Answer» At what value of angle Q, the distance between two consecutive planes in a crystal is equal to the wavelength of the X-rays used (assure $1^{s t}$ order diffractions)

Discussion

6.	a body is thrown at some angle from the ground .the magnitude of change in velocity of body in 5 s ,if it is still in air ,is
Answer» a body is thrown at some angle from the ground .the magnitude of change in velocity of body in 5 s ,if it is still in air ,is

Discussion

7.	A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected?
Answer» A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected?

Discussion

8.	(a) Figure 9.35 shows a cross-section of a ‘light pipe’ madeof a glass fibre of refractive index 1.68. The outer covering of thepipe is made of a material of refractive index 1.44. What is therange of the angles of the incident rays with the axis of the pipefor which total reflections inside the pipe take place, as shown inthe figure. (b) What is the answer if there is no outer covering of the pipe?
Answer» (a) Figure 9.35 shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure. (b) What is the answer if there is no outer covering of the pipe?

8.

(a) Figure 9.35 shows a cross-section of a ‘light pipe’ madeof a glass fibre of refractive index 1.68. The outer covering of thepipe is made of a material of refractive index 1.44. What is therange of the angles of the incident rays with the axis of the pipefor which total reflections inside the pipe take place, as shown inthe figure. (b) What is the answer if there is no outer covering of the pipe?

Answer»

(a)
Figure 9.35 shows a cross-section of a ‘light pipe’ made
of a glass fibre of refractive index 1.68. The outer covering of the
pipe is made of a material of refractive index 1.44. What is the
range of the angles of the incident rays with the axis of the pipe
for which total reflections inside the pipe take place, as shown in
the figure.

(b)
What is the answer if there is no outer covering of the pipe?

Discussion

9.	32.A body of mass 150 gm is dropped from point A, takes time t1 to reach point B at ground. One more the same body is dropped from point A and when body tranverses half the distance, a bullet of mass 50 gm, moving horizontally with speed 40 m/s hits the falling body at point C and sticks to it. The total time of flight of the body in this case is t2 s and the body strikes at a point D a little far way from point B. g = 10 m/s2 The ratio of t1 :t2 = Distance BD =
Answer» 32.A body of mass 150 gm is dropped from point A, takes time t1 to reach point B at ground. One more the same body is dropped from point A and when body tranverses half the distance, a bullet of mass 50 gm, moving horizontally with speed 40 m/s hits the falling body at point C and sticks to it. The total time of flight of the body in this case is t2 s and the body strikes at a point D a little far way from point B. g = 10 m/s2 The ratio of t1 :t2 = Distance BD =

Discussion

10.	The correct cyclic sequence of the outputs (Q0,Q1) for the JK master-slave flip-flop circuit shown in figure when the input clock applied is
Answer» The correct cyclic sequence of the outputs $(Q_{0}, Q_{1})$ for the JK master-slave flip-flop circuit shown in figure when the input clock applied is

Discussion

11.	Can electric potential at a point be zero, while electric field is non zero? Justify.
Answer» Can electric potential at a point be zero, while electric field is non zero? Justify.

Discussion

12.	In the figure shown , the capacitor is initially uncharged. The current in resistor R3 at time t is E2R⎛⎜⎜⎝1−e−AtBRC⎞⎟⎟⎠. Consider that R1=R2=R3=R, the value of A+B will be:
Answer» In the figure shown , the capacitor is initially uncharged. The current in resistor $R_{3}$ at time $t$ is $\frac{E}{2 R} ⎛ ⎜⎜ ⎝ 1 - e^{\frac{- A t}{B R C}} ⎞ ⎟⎟ ⎠$ . Consider that $R_{1} = R_{2} = R_{3} = R$ , the value of $A + B$ will be:

Discussion

13.	A defective balance has equal arms. A body weighs w1 when placed in one pan and w2 when placed in the other pan. Then the weight w of the object is 1.(w1-w)÷
Answer» A defective balance has equal arms. A body weighs w1 when placed in one pan and w2 when placed in the other pan. Then the weight w of the object is 1.(w1-w)÷

Discussion

14.	25 The adiabatic elasticity of a diatomic gas at NTP is ? Explain properly
Answer» 25 The adiabatic elasticity of a diatomic gas at NTP is ? Explain properly

Discussion

15.	unpaired electron in Co and Fe in \lbrack Co(H_2O)_6\rbrack\lbrack Fe(C_2O_4)_3\rbrack respectivel
Answer» unpaired electron in Co and Fe in \lbrack Co(H_2O)_6\rbrack\lbrack Fe(C_2O_4)_3\rbrack respectivel

Discussion

16.	A parallel capacitor has plate of length l, width w and separation of plates is d. It is connected to a battery of emf V. A dielectric slab of the same thickness d and of dielectric constant K=4 is being inserted between the plates of the capacitor. At what length of the slab inside plates, will the energy in the capacitor be two times the initial energy stored?
Answer» A parallel capacitor has plate of length $l$ , width $w$ and separation of plates is $d$ . It is connected to a battery of emf $V$ . A dielectric slab of the same thickness $d$ and of dielectric constant $K = 4$ is being inserted between the plates of the capacitor. At what length of the slab inside plates, will the energy in the capacitor be two times the initial energy stored?

Discussion

17.	The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of θ for the following refraction
Answer» The refractive index of the material of the prism and liquid are $1.56$ and $1.32$ respectively. What will be the value of θ for the following refraction

Discussion

18.

Match the following: Column-IColumn-II(i). Positively charged Spherical conductor.(a). At the surface , electric field is continuous and maximum.(ii). Spherical non conductor having uniform volume charge distribution.(b). at the surface, electric field is dis-continuous.(iii). Positively charged ring.(c). Electric field is uniform.(iv). Infinite thin sheet of positive charge(d). at the center, electric field is zero.

Answer»

Match the following:

Column- $I$	Column- $II$
$(i) .$ Positively charged Spherical conductor.	$(a) .$ At the surface , electric field is continuous and maximum.
$(ii) .$ Spherical non conductor having uniform volume charge distribution.	$(b) .$ at the surface, electric field is dis-continuous.
$(iii) .$ Positively charged ring.	$(c) .$ Electric field is uniform.
$(iv) .$ Infinite thin sheet of positive charge	$(d) .$ at the center, electric field is zero.

Discussion

19.	A uniform current carrying ring of mass m and radius R is connected by a massless string as shown in the figure. A uniform magnetic field B0 exists in the region to keep the ring in horizontal position, then the current in the ring is (l= length of string)
Answer» A uniform current carrying ring of mass $m$ and radius $R$ is connected by a massless string as shown in the figure. A uniform magnetic field $B_{0}$ exists in the region to keep the ring in horizontal position, then the current in the ring is ( $l =$ length of string)

Discussion

20.	If C is the critical angle and n is the refractive index of a denser medium with respect to the rarer medium, sin C×n is .
Answer» If $C$ is the critical angle and $n$ is the refractive index of a denser medium with respect to the rarer medium, $s i n C \times n$ is .

Discussion

21.	A particle moves in the x - y plane under theinfluence of a force such that its linear momentumis p(t) \lbrack i cos(at)- j sin (at)\rbrack B, where a andare constants. The angle between the force andthe momentum is(1) 0^° (2) 45^° (3) 60^° (4) 90^°
Answer» A particle moves in the x - y plane under theinfluence of a force such that its linear momentumis p(t) \lbrack i cos(at)- j sin (at)\rbrack B, where a andare constants. The angle between the force andthe momentum is(1) 0^° (2) 45^° (3) 60^° (4) 90^°

Discussion

22.	we say charge is independent of speed and it is associated with mass. but according theory of relativity with speed mass changes then charge should also change?
Answer» we say charge is independent of speed and it is associated with mass. but according theory of relativity with speed mass changes then charge should also change?

Discussion

23.	A train is running at full speed when brakes are applied. In the first minute it travels 8 km and in the next minute it travels 3 km. initial speed of the train is
Answer» A train is running at full speed when brakes are applied. In the first minute it travels 8 km and in the next minute it travels 3 km. initial speed of the train is

Discussion

24.	A ball is projected upwards from the top of a tower with a velocity 50 m/s making an elevation angle 30∘ with the horizontal. The height of the tower is 70 m. Find time taken by the ball to reach the ground from the instant of throwing.
Answer» A ball is projected upwards from the top of a tower with a velocity $50 m/s$ making an elevation angle $30^{\circ}$ with the horizontal. The height of the tower is $70 m$ . Find time taken by the ball to reach the ground from the instant of throwing.

Discussion

25.	6.Define instantaneous centripital acceleration in case of a projectile thrown from ground.
Answer» 6.Define instantaneous centripital acceleration in case of a projectile thrown from ground.

Discussion

26.	Two blocks of mass 3 kg and 2 kg are tied by a massless string. A force of 100 N is applied on 3 kg block as shown. Find the tension in the string. (g=10 m/s2)
Answer» Two blocks of mass $3 kg$ and $2 kg$ are tied by a massless string. A force of $100 N$ is applied on $3 kg$ block as shown. Find the tension in the string. $(g = 10 {m/s}^{2})$

Discussion

27.	The temperature at 0^{° }C of two rods are R_1&R_2.Their coeffecient os temp.are α_{1 }& α_2 such that α_2=nα_1 and R_2=nR_1.If they are joine in parallel then find the effective coeffecient of temperatue
Answer» The temperature at 0^{° }C of two rods are R_1&R_2.Their coeffecient os temp.are α_{1 }& α_2 such that α_2=nα_1 and R_2=nR_1.If they are joine in parallel then find the effective coeffecient of temperatue

Discussion

28.	A force is acting on a body of mass 3 kg kept on a rough horizontal surface. If a friction force of 40 N is required to keep the body at rest under the action of this external force. Find the contact force acting on the body. (Take g=10 m/s2)
Answer» A force is acting on a body of mass $3 k g$ kept on a rough horizontal surface. If a friction force of $40 N$ is required to keep the body at rest under the action of this external force. Find the contact force acting on the body. (Take $g = 10 m / s^{2}$ )

Discussion

29.	For the same value of angle of incidence, the angle of refraction in 3 media A, B and C are 15 degrees, 25 degrees and 35 degrees respectively. In which medium would the velocity of light be minimum
Answer» For the same value of angle of incidence, the angle of refraction in 3 media A, B and C are 15 degrees, 25 degrees and 35 degrees respectively. In which medium would the velocity of light be minimum

Discussion

30.	The horizontal range of a projectile is 4√3 times its maximum height. Its angle of projection will be
Answer» The horizontal range of a projectile is $4 \sqrt{3}$ times its maximum height. Its angle of projection will be

Discussion

31.	How to convert celcius to Fahrenheit
Answer» How to convert celcius to Fahrenheit

Discussion

32.	Mark the incorrect statements about the frictionbetween two bodies.(1) Limiting friction is never less than staticfriction(2) Limiting friction is greater than. the kineticfriction(3) Static friction is always greater than thekinetic friction(4) Coefficient of static friction is greater than thecoefficient of kinetic friction
Answer» Mark the incorrect statements about the frictionbetween two bodies.(1) Limiting friction is never less than staticfriction(2) Limiting friction is greater than. the kineticfriction(3) Static friction is always greater than thekinetic friction(4) Coefficient of static friction is greater than thecoefficient of kinetic friction

Discussion

33.	A body of mass m slides down on an incline plane. It reaches at the bottom with a velocity v. If the same mass were in the form of the ring which rolls down this inclined, the velocity of the ring at the bottom’s
Answer» A body of mass m slides down on an incline plane. It reaches at the bottom with a velocity v. If the same mass were in the form of the ring which rolls down this inclined, the velocity of the ring at the bottom’s

Discussion

34.	149. In the network shown find the resistant across AB
Answer» 149. In the network shown find the resistant across AB

Discussion

35.	An α−particle of energy 3 MeV is scattered through 180∘ by gold nucleus. The distance of the closest approach is of the order of -The atomic number of gold is 79.
Answer» An $α -$ particle of energy $3 MeV$ is scattered through $180^{\circ}$ by gold nucleus. The distance of the closest approach is of the order of - The atomic number of gold is $79$ .

Discussion

36.	Magnetic dipole moment of a uniformly charged square plate of side l and charge Q rotating about an axis passing through center of mass and perpendicular to plane with angular velocity ω is
Answer» Magnetic dipole moment of a uniformly charged square plate of side $l$ and charge $Q$ rotating about an axis passing through center of mass and perpendicular to plane with angular velocity $ω$ is

Discussion

37.	A ring of mass 2π kg and of radius 0.25 m is making 300 rpm about an axis through its centre, perpendicular to its plane. The tension (in newtons) developed in the ring is approximately
Answer» A ring of mass $2 π kg$ and of radius $0.25 m$ is making $300 rpm$ about an axis through its centre, perpendicular to its plane. The tension (in newtons) developed in the ring is approximately

Discussion

38.	10.A rod of length l rotates with a small but uniform angular velocity w about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. The potential difference between the two ends of the rod is
Answer» 10.A rod of length l rotates with a small but uniform angular velocity w about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. The potential difference between the two ends of the rod is

Discussion

39.	A boy standing on a long raiboard car throws a ball straight upwards. The car is moving on the horizontal road with an acceleration of 1 m/s2 and the projection velocity in the vertical direction in 9.8 m/s. How far behind the boy will the ball fail on the car ?
Answer» A boy standing on a long raiboard car throws a ball straight upwards. The car is moving on the horizontal road with an acceleration of 1 $m / s^{2}$ and the projection velocity in the vertical direction in 9.8 m/s. How far behind the boy will the ball fail on the car ?

Discussion

40.	A block of mass 6kg is acted by force F = 2xi + 8k and is displaced from (1,1,1) to point (4,2,0) . Find work done by force.
Answer» A block of mass 6kg is acted by force F = 2xi + 8k and is displaced from (1,1,1) to point (4,2,0) . Find work done by force.

Discussion

41.	36 A cylindrical rod has temperatures T, and T, at itsends. The rate of flow of heat is Q (cal/s). If all theRnear dimension2sare doubled keepingemperatures constant, then rate of flow of heat Qwill be(2) 20,(1) 40(4)(3)4
Answer» 36 A cylindrical rod has temperatures T, and T, at itsends. The rate of flow of heat is Q (cal/s). If all theRnear dimension2sare doubled keepingemperatures constant, then rate of flow of heat Qwill be(2) 20,(1) 40(4)(3)4

Discussion

42.	The refractive indices of flint glass for red and violet light are 1.613 and 1.632 respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle of 5∘.
Answer» The refractive indices of flint glass for red and violet light are $1.613$ and $1.632$ respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle of $5^{\circ}$ .

Discussion

43.	A sound source S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed, VS=19.4 ms−1 at an angle of 60∘ with line joining the source and the observe as shown in the figure. If the observer is at rest, the apparent frequency observed by the observer is (Velocity of sound in air 330 ms−1)
Answer» A sound source S emitting waves of frequency $100 Hz$ and an observer O are located at some distance from each other. The source is moving with a speed, $V_{S} = 19.4 {ms}^{- 1}$ at an angle of $60^{\circ}$ with line joining the source and the observe as shown in the figure. If the observer is at rest, the apparent frequency observed by the observer is (Velocity of sound in air $330 {ms}^{- 1})$

Discussion

44.	In a steam power plant, power output from the turbine is 2162 kW and required pumping power is 10 kW. If efficiency of Rankine cycle on which power plant is working is 24%, then the value of mass flow rate of coal used in boiler will be kg/s. Assume calorific value of coal as 29 MJ/kg and ηcombustion=0.95 0.325
Answer» In a steam power plant, power output from the turbine is 2162 kW and required pumping power is 10 kW. If efficiency of Rankine cycle on which power plant is working is 24%, then the value of mass flow rate of coal used in boiler will be kg/s. Assume calorific value of coal as 29 MJ/kg and $η_{c o m b u s t i o n} = 0.95$ 0.325

Discussion

45.	The equation of a stationary waveisurfacengV 2Asin/ nctWhich of the following statements is incorrect. .(1) The unit of ct is same as that of λ (2) The unit of x is same as that of λ coSaccan2TX12.(3) The unit ofis same as that of TeatV4) The unit of즛is same as that ofed'
Answer» The equation of a stationary waveisurfacengV 2Asin/ nctWhich of the following statements is incorrect. .(1) The unit of ct is same as that of λ (2) The unit of x is same as that of λ coSaccan2TX12.(3) The unit ofis same as that of TeatV4) The unit of즛is same as that ofed'

Discussion

46.	A solid cylinder (radius r=0.2 m) rolls without slipping in a cylindrical trough (radius R=0.8 m). The time period of small oscillations is[Take g=10 m/s2]
Answer» A solid cylinder (radius $r = 0.2 m$ ) rolls without slipping in a cylindrical trough (radius $R = 0.8 m$ ). The time period of small oscillations is [Take $g = 10 {m/s}^{2}$ ]

Discussion

47.	Two parallel plate capacitors of capacitances C and 2C are connected in parallel and charged to a potential difference V0. The battery is then disconnected and the region between the plates of the capacitor C is completely filled with a material of dielectric constant 2. The potential difference across the capacitors now becomes:
Answer» Two parallel plate capacitors of capacitances C and 2C are connected in parallel and charged to a potential difference $V_{0}$ . The battery is then disconnected and the region between the plates of the capacitor C is completely filled with a material of dielectric constant 2. The potential difference across the capacitors now becomes:

Discussion

48.	A single block brake with a short shoe and torque capacity of 250 Nm is shown. The cylindrical brake drum rotates anticlockwise at 100 rpm and the coefficient of friction is 0.25. The value of a in mm (round off to one decimal place), such that the maximum actuating force P is 2000 N is212.5
Answer» A single block brake with a short shoe and torque capacity of 250 Nm is shown. The cylindrical brake drum rotates anticlockwise at 100 rpm and the coefficient of friction is 0.25. The value of a in mm (round off to one decimal place), such that the maximum actuating force P is 2000 N is 212.5

Discussion

49.	A point charge 50 μC is located in the XY-plane at the point of position vector →r0=2^i+3^j. Find the electric field (V/m) due to this point charge at the point of position vector →r=8^i−5^j
Answer» A point charge $50 μ C$ is located in the $XY-$ plane at the point of position vector ${\to r}_{0} = 2^i + 3^j$ . Find the electric field ( $V/m$ ) due to this point charge at the point of position vector $\to r = 8^i - 5^j$

Discussion

50.	A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The K.E attained by the particle after moving a distance y is
Answer» A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The K.E attained by the particle after moving a distance y is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A person standing on the top of a cliff, 171 ft high, has to throw a packet to his friend standing on the ground 228 ft horizontally away. If he throws the packet directly aiming at the friend with a speed of 15.0 ft/s, how short will the packet fall? Give g = 32 ft/s2.

A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm, find the work to be done against the gravitational force between them to take the particle for away from the sphere:-(G=6.67×10−11Nm2kg2)

At what value of angle Q, the distance between two consecutive planes in a crystal is equal to the wavelength of the X-rays used (assure 1st order diffractions)

a body is thrown at some angle from the ground .the magnitude of change in velocity of body in 5 s ,if it is still in air ,is

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected?

The correct cyclic sequence of the outputs (Q0,Q1) for the JK master-slave flip-flop circuit shown in figure when the input clock applied is

Can electric potential at a point be zero, while electric field is non zero? Justify.

In the figure shown , the capacitor is initially uncharged. The current in resistor R3 at time t is E2R⎛⎜⎜⎝1−e−AtBRC⎞⎟⎟⎠. Consider that R1=R2=R3=R, the value of A+B will be:

A defective balance has equal arms. A body weighs w1 when placed in one pan and w2 when placed in the other pan. Then the weight w of the object is 1.(w1-w)÷

25 The adiabatic elasticity of a diatomic gas at NTP is ? Explain properly

unpaired electron in Co and Fe in \lbrack Co(H_2O)_6\rbrack\lbrack Fe(C_2O_4)_3\rbrack respectivel

The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of θ for the following refraction

A uniform current carrying ring of mass m and radius R is connected by a massless string as shown in the figure. A uniform magnetic field B0 exists in the region to keep the ring in horizontal position, then the current in the ring is (l= length of string)

If C is the critical angle and n is the refractive index of a denser medium with respect to the rarer medium, sin C×n is .

A particle moves in the x - y plane under theinfluence of a force such that its linear momentumis p(t) \lbrack i cos(at)- j sin (at)\rbrack B, where a andare constants. The angle between the force andthe momentum is(1) 0^° (2) 45^° (3) 60^° (4) 90^°

we say charge is independent of speed and it is associated with mass. but according theory of relativity with speed mass changes then charge should also change?

A train is running at full speed when brakes are applied. In the first minute it travels 8 km and in the next minute it travels 3 km. initial speed of the train is

A ball is projected upwards from the top of a tower with a velocity 50 m/s making an elevation angle 30∘ with the horizontal. The height of the tower is 70 m. Find time taken by the ball to reach the ground from the instant of throwing.

6.Define instantaneous centripital acceleration in case of a projectile thrown from ground.

Two blocks of mass 3 kg and 2 kg are tied by a massless string. A force of 100 N is applied on 3 kg block as shown. Find the tension in the string. (g=10 m/s2)

The temperature at 0^{° }C of two rods are R_1&R_2.Their coeffecient os temp.are α_{1 }& α_2 such that α_2=nα_1 and R_2=nR_1.If they are joine in parallel then find the effective coeffecient of temperatue

A force is acting on a body of mass 3 kg kept on a rough horizontal surface. If a friction force of 40 N is required to keep the body at rest under the action of this external force. Find the contact force acting on the body. (Take g=10 m/s2)

For the same value of angle of incidence, the angle of refraction in 3 media A, B and C are 15 degrees, 25 degrees and 35 degrees respectively. In which medium would the velocity of light be minimum

The horizontal range of a projectile is 4√3 times its maximum height. Its angle of projection will be

How to convert celcius to Fahrenheit

A body of mass m slides down on an incline plane. It reaches at the bottom with a velocity v. If the same mass were in the form of the ring which rolls down this inclined, the velocity of the ring at the bottom’s

149. In the network shown find the resistant across AB

An α−particle of energy 3 MeV is scattered through 180∘ by gold nucleus. The distance of the closest approach is of the order of -The atomic number of gold is 79.

Magnetic dipole moment of a uniformly charged square plate of side l and charge Q rotating about an axis passing through center of mass and perpendicular to plane with angular velocity ω is

A ring of mass 2π kg and of radius 0.25 m is making 300 rpm about an axis through its centre, perpendicular to its plane. The tension (in newtons) developed in the ring is approximately

10.A rod of length l rotates with a small but uniform angular velocity w about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. The potential difference between the two ends of the rod is

A boy standing on a long raiboard car throws a ball straight upwards. The car is moving on the horizontal road with an acceleration of 1 m/s2 and the projection velocity in the vertical direction in 9.8 m/s. How far behind the boy will the ball fail on the car ?

A block of mass 6kg is acted by force F = 2xi + 8k and is displaced from (1,1,1) to point (4,2,0) . Find work done by force.

36 A cylindrical rod has temperatures T, and T, at itsends. The rate of flow of heat is Q (cal/s). If all theRnear dimension2sare doubled keepingemperatures constant, then rate of flow of heat Qwill be(2) 20,(1) 40(4)(3)4

The refractive indices of flint glass for red and violet light are 1.613 and 1.632 respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle of 5∘.

The equation of a stationary waveisurfacengV 2Asin/ nctWhich of the following statements is incorrect. .(1) The unit of ct is same as that of λ (2) The unit of x is same as that of λ coSaccan2TX12.(3) The unit ofis same as that of TeatV4) The unit of즛is same as that ofed'

A solid cylinder (radius r=0.2 m) rolls without slipping in a cylindrical trough (radius R=0.8 m). The time period of small oscillations is[Take g=10 m/s2]

A single block brake with a short shoe and torque capacity of 250 Nm is shown. The cylindrical brake drum rotates anticlockwise at 100 rpm and the coefficient of friction is 0.25. The value of a in mm (round off to one decimal place), such that the maximum actuating force P is 2000 N is212.5

A point charge 50 μC is located in the XY-plane at the point of position vector →r0=2^i+3^j. Find the electric field (V/m) due to this point charge at the point of position vector →r=8^i−5^j

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The K.E attained by the particle after moving a distance y is