50278 + Interview Questions in Physics

1.	Consider following statements about coriolis force. 1. This force states that the winds in the northern hemisphere will be deflected to the right hand side while in southern hemisphere the winds will be deflected to left. 2. The coriolis force is minimum at the equator while it increase poleward. Select the correct statements:
Answer» Consider following statements about coriolis force. 1. This force states that the winds in the northern hemisphere will be deflected to the right hand side while in southern hemisphere the winds will be deflected to left. 2. The coriolis force is minimum at the equator while it increase poleward. Select the correct statements:

1.

Consider following statements about coriolis force. 1. This force states that the winds in the northern hemisphere will be deflected to the right hand side while in southern hemisphere the winds will be deflected to left. 2. The coriolis force is minimum at the equator while it increase poleward. Select the correct statements:

Answer»

Consider following statements about coriolis force.

1. This force states that the winds in the northern hemisphere will be deflected to the right hand side while in southern hemisphere the winds will be deflected to left.

2. The coriolis force is minimum at the equator while it increase poleward.

Select the correct statements:

Discussion

2.	Explain what is meant by action-reaction pair.
Answer» Explain what is meant by action-reaction pair.

Discussion

3.	Two blocks m1and m2, are acted upon by the forces F1 and F2 as shown in the fig. If there is no relative sliding between the blocks and the ground is smooth, find the magnitude of static friction between the blocks.Make necessary assumptions.
Answer» Two blocks $m_{1}$ and $m_{2}$ , are acted upon by the forces $F_{1}$ and $F_{2}$ as shown in the fig. If there is no relative sliding between the blocks and the ground is smooth, find the magnitude of static friction between the blocks.Make necessary assumptions.

3.

Two blocks m1and m2, are acted upon by the forces F1 and F2 as shown in the fig. If there is no relative sliding between the blocks and the ground is smooth, find the magnitude of static friction between the blocks.Make necessary assumptions.

Answer»

Two blocks $m_{1}$ and $m_{2}$ , are acted upon by the forces $F_{1}$ and $F_{2}$ as shown in the fig. If there is no relative sliding between the blocks and the ground is smooth, find the magnitude of static friction between the blocks.Make necessary assumptions.

Discussion

4.	A light rod of length l=1 m is hinged at its centre and two masses of m1=5 kg and m2=2 kg are hung from the ends as shown in figure. Find the initial angular acceleration of the rod assuming that it was horizontal in beginning. (Take g=10 m/s2)
Answer» A light rod of length $l = 1 m$ is hinged at its centre and two masses of $m_{1} = 5 kg$ and $m_{2} = 2 kg$ are hung from the ends as shown in figure. Find the initial angular acceleration of the rod assuming that it was horizontal in beginning. (Take $g = 10 m / s^{2}$ )

Discussion

5.	A string is producing transverse vibration whose equation is y = 0.021 sin ( x + 30 t ) Where x and y are in meters and t is in seconds. If the linear density of the string is 1.3 ×10−4 kg/m, then the tension in the string in N will be [RPET 1999; RPMT 2002]
Answer» A string is producing transverse vibration whose equation is y = 0.021 sin ( x + 30 t ) Where x and y are in meters and t is in seconds. If the linear density of the string is 1.3 $\times 10^{- 4}$ kg/m, then the tension in the string in N will be [RPET 1999; RPMT 2002]

5.

A string is producing transverse vibration whose equation is y = 0.021 sin ( x + 30 t ) Where x and y are in meters and t is in seconds. If the linear density of the string is 1.3 ×10−4 kg/m, then the tension in the string in N will be [RPET 1999; RPMT 2002]

Answer»

A string is producing transverse vibration whose equation

is y = 0.021 sin ( x + 30 t ) Where x and y are in meters and t is in seconds. If

the linear density of the string is 1.3 $\times 10^{- 4}$ kg/m, then the tension in the string

in N will be

[RPET 1999; RPMT 2002]

Discussion

6.	cos130° cos40° + sin130° sin40° is equal to
Answer» cos130° cos40° + sin130° sin40° is equal to

Discussion

7.	A train runs along an unbanked circular track of radius 30 m at a speed of 54 km/h. The mass of the train is 106 kg. What provides the centripetal force required for this purpose - The engine or the rails? What is the angle of banking required to prevent wearing out of the rail?
Answer» A train runs along an unbanked circular track of radius 30 m at a speed of 54 km/h. The mass of the train is $10^{6}$ kg. What provides the centripetal force required for this purpose - The engine or the rails? What is the angle of banking required to prevent wearing out of the rail?

Discussion

8.	Two identical uniform discs roll without slipping on two different surfaces AB and CD (see figure) starting at A and C with linear speeds v1 and v2, respectively, and always remain in contact with the surfaces. If they reach B and D with the same linear speed and v1=3 m/s, then v2 in m/s is ___. (g=10 m/s2)
Answer» Two identical uniform discs roll without slipping on two different surfaces AB and CD (see figure) starting at A and C with linear speeds $v_{1} a n d v_{2},$ respectively, and always remain in contact with the surfaces. If they reach B and D with the same linear speed and $v_{1} = 3$ m/s, then $v_{2}$ in m/s is ___. $(g = 10 m / s^{2})$

Discussion

9.	Two pendula have time periods T and 5T4. They start SHM at the same time from the mean position. The phase difference between them after the pendulum with larger period completes one oscillation is
Answer» Two pendula have time periods T and $\frac{5 T}{4}$ . They start SHM at the same time from the mean position. The phase difference between them after the pendulum with larger period completes one oscillation is

Discussion

10.	A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is
Answer» A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

10.

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

Answer»

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

Discussion

11.	4.0 g of helium occupies 22400 cm3 at STP. The specific heat capacity of helium at constant pressure is 5.0 cal K−1. Calculate the speed of sound in helium at STP.
Answer» 4.0 g of helium occupies 22400 $c m^{3}$ at STP. The specific heat capacity of helium at constant pressure is 5.0 cal $K^{- 1}$ . Calculate the speed of sound in helium at STP.

Discussion

12.	A uniform circular disc of radius 'R' with a concentric circular hole of radius R2 rolls on a horizontal plane. The fraction of its total energy associated with its rotational motion is
Answer» A uniform circular disc of radius 'R' with a concentric circular hole of radius $\frac{R}{2}$ rolls on a horizontal plane. The fraction of its total energy associated with its rotational motion is

Discussion

13.	From a stationary tank of mass 125000 pound a small shell of mass 25 pound is fired with a muzzle velocity of 1000 ft/sec. The tank recoils with a velocity of
Answer» From a stationary tank of mass 125000 pound a small shell of mass 25 pound is fired with a muzzle velocity of 1000 ft/sec. The tank recoils with a velocity of

13.

From a stationary tank of mass 125000 pound a small shell of mass 25 pound is fired with a muzzle velocity of 1000 ft/sec. The tank recoils with a velocity of

Answer»

From a stationary tank of mass 125000 pound a small shell of mass 25 pound is fired with a muzzle velocity of 1000 ft/sec. The tank recoils with a velocity of

Discussion

14.	Two particles are projected simultaneously from the towers of same height as shown in the figure with velocities VA=20 m/s and VB=10 m/s respectively. They collide in air after 0.5 seconds. Find ′θ′. Answer in degrees
Answer» Two particles are projected simultaneously from the towers of same height as shown in the figure with velocities $V_{A} = 20 m/s$ and $V_{B} = 10 m/s$ respectively. They collide in air after 0.5 seconds. Find $^{'} θ^{'}$ . Answer in degrees

Discussion

15.	Four particles each of mass M, are located at the vertices of a square with side L. The gravitational potential due to this at the centre of the square is
Answer» Four particles each of mass M, are located at the vertices of a square with side L. The gravitational potential due to this at the centre of the square is

Discussion

16.	For a projectile on ground, the maximum angle between instantaneous velocity and instantaneous acceleration is _____ and at _______ seconds.
Answer» For a projectile on ground, the maximum angle between instantaneous velocity and instantaneous acceleration is _____ and at _______ seconds.

Discussion

17.	A pole of length 1.00 m stands half dipped in a swimming pool with water level 50.0 cm higher than the bed. The refractive index of water is 1.33 and sunlight is coming at an angle of 45∘ with the vertical. Find the length of the shadow of the pole on the bed.
Answer» A pole of length 1.00 m stands half dipped in a swimming pool with water level 50.0 cm higher than the bed. The refractive index of water is 1.33 and sunlight is coming at an angle of $45^{\circ}$ with the vertical. Find the length of the shadow of the pole on the bed.

Discussion

18.	Following properties will decrease with increase in temperature except
Answer» Following properties will decrease with increase in temperature except

Discussion

19.	The probability that a certain radioactive atom would get disintegrated in a time equal to the mean life of the radioactive sample is:
Answer» The probability that a certain radioactive atom would get disintegrated in a time equal to the mean life of the radioactive sample is:

Discussion

20.	A biker is moving with a speed of 15 m/s on a flat road. The coefficient of friction between the wheels of the bike and the road is 0.4. If he approaches a curve, what is the minimum radius of the turn that he can take safely?
Answer» A biker is moving with a speed of $15 m/s$ on a flat road. The coefficient of friction between the wheels of the bike and the road is $0.4$ . If he approaches a curve, what is the minimum radius of the turn that he can take safely?

Discussion

21.	On moving a charge of 20 C by 2 cm, 2 J of work is done. Find the potential difference between the two points.
Answer» On moving a charge of 20 C by 2 cm, 2 J of work is done. Find the potential difference between the two points.

Discussion

22.	Write the dimensions of the a and b in the equation v=a+bt where v is velocity and t is time
Answer» Write the dimensions of the a and b in the equation v=a+bt where v is velocity and t is time

Discussion

23.	A spherically symmetric gravitational system of particles has a mass density ρ={ρ0 for r≤R0 for r>R where ρ0 is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed V as a function of distance r(0<r<∞) from the centre of the system is represented by
Answer» A spherically symmetric gravitational system of particles has a mass density $ρ = {\begin{matrix} ρ_{0} for r \leq R 0 for r > R \end{matrix}$ where $ρ_{0}$ is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed $V$ as a function of distance $r (0 < r < \infty)$ from the centre of the system is represented by

Discussion

24.	Find the time period of meeting of the minute hand and second hand of a clock. (Initial positions are shown in the figure below)
Answer» Find the time period of meeting of the minute hand and second hand of a clock. (Initial positions are shown in the figure below)

Discussion

25.	Choose the correct answer.∫sin2x−cos2xsin2xcos2xdx is equal to (a)tan x+cot x+C(b)tan x+cosec x+C(c)-tan x+cot x+C(d)tan x+sec x+C
Answer» Choose the correct answer. $\int \frac{s i n^{2} x - c o s^{2} x}{s i n^{2} x c o s^{2} x} d x$ is equal to $(a)tan x+cot x+C (b)tan x+cosec x+C (c)-tan x+cot x+C (d)tan x+sec x+C$

Discussion

26.	A spring of force constant k is cut into two parts whose lengths are in the ratio 1:2. The two parts are now connected in the parallel and a block of mass M is suspended at the end of the combined spring. The time period of oscillation of the block is?
Answer» A spring of force constant k is cut into two parts whose lengths are in the ratio 1:2. The two parts are now connected in the parallel and a block of mass M is suspended at the end of the combined spring. The time period of oscillation of the block is?

Discussion

27.	Find the position of the center of mass of a hollow hemisphere of radius R=10 cm. Assume center O as origin.
Answer» Find the position of the center of mass of a hollow hemisphere of radius $R = 10 cm$ . Assume center $O$ as origin.

Discussion

28.	The moment of inertia of a uniform square plate of mass M and edge of length 'l' about its axis passing through 'P' and perpendicular to it is
Answer» The moment of inertia of a uniform square plate of mass M and edge of length 'l' about its axis passing through 'P' and perpendicular to it is

28.

The moment of inertia of a uniform square plate of mass M and edge of length 'l' about its axis passing through 'P' and perpendicular to it is

Answer»

The moment of inertia of a uniform square plate of mass M and edge of length 'l' about its axis passing through 'P' and perpendicular to it is

Discussion

29.	A balloon with a rope ladder hanging from it has a mass 4m. With a boy of mass m at the lowest rung of the ladder, the balloon is floating in equilibrium in the sky. The boy climbs the ladder of length L reaching its top. If g is acceleration due to gravity, then the gain in the gravitational potential energy of the boy is
Answer» A balloon with a rope ladder hanging from it has a mass 4m. With a boy of mass m at the lowest rung of the ladder, the balloon is floating in equilibrium in the sky. The boy climbs the ladder of length L reaching its top. If g is acceleration due to gravity, then the gain in the gravitational potential energy of the boy is

Discussion

30.	A semicircular rod is joined at its end to a straight rod of the same material and the same cross -sectional area. The straight rod forms a diameter of the other rod. The junctions are maintained at different temperatures. Find the ratio of the heat transferred through a cross section of the semicircular rod to the heat transferred through a cross section of the straight rod in a given time.
Answer» A semicircular rod is joined at its end to a straight rod of the same material and the same cross -sectional area. The straight rod forms a diameter of the other rod. The junctions are maintained at different temperatures. Find the ratio of the heat transferred through a cross section of the semicircular rod to the heat transferred through a cross section of the straight rod in a given time.

Discussion

31.	The unit of thermal conductivity is
Answer» The unit of thermal conductivity is

Discussion

32.	Find the longitudinal stress applied to a steel wire to stretch it by 0.025 % of its original length, if the ratio of longitudinal stress and strain is 9×1010 Nm−2.
Answer» Find the longitudinal stress applied to a steel wire to stretch it by $0.025 %$ of its original length, if the ratio of longitudinal stress and strain is $9 \times 10^{10} {Nm}^{- 2}$ .

Discussion

33.	On what factors does the magnitude of induced EMF in a coil depends?
Answer» On what factors does the magnitude of induced EMF in a coil depends?

Discussion

34.	A body started with velocity of 20 ms−1 and moving with an acceleration of 2 ms−2. The distance travelled by the body in the 8th second is
Answer» A body started with velocity of $20 {ms}^{- 1}$ and moving with an acceleration of $2 {ms}^{- 2}$ . The distance travelled by the body in the $8^{t h}$ second is

Discussion

35.	A particle executing simple harmonic motion along y-axis has its motion described by the equation. y=Asin(ωt)+B. The amplitude of the simple harmonic motion is
Answer» A particle executing simple harmonic motion along y-axis has its motion described by the equation. $y = A s i n (ω t) + B$ . The amplitude of the simple harmonic motion is

Discussion

36.	Beckmann thermometers are used to measure
Answer» Beckmann thermometers are used to measure

Discussion

37.	A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?
Answer» A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?

37.

A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?

Answer»

A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?

Discussion

38.	find the magnitude of two forces such that if they are at right angles their resultant is root 10 Newton what is there at 60 degree their resultant is root 13 Newton
Answer» find the magnitude of two forces such that if they are at right angles their resultant is root 10 Newton what is there at 60 degree their resultant is root 13 Newton

Discussion

39.	A boy standing on a building of height 20 m throws a stone with a velocity of 15 ms−1. What should be the angle of projection so that the stone has a range of 30 m ? (Take g=10 m/s2)
Answer» A boy standing on a building of height $20 m$ throws a stone with a velocity of $15 {ms}^{- 1}$ . What should be the angle of projection so that the stone has a range of $30 m$ ? (Take $g = 10 m / s^{2}$ )

Discussion

40.	The phenomenon of Photoelectric effect is used in
Answer» The phenomenon of Photoelectric effect is used in

Discussion

41.	The S.I unit of Surface tension is:
Answer» The S.I unit of Surface tension is:

Discussion

42.	In Young's double slit experiment the slits are 0.5 mm apart and interference is observed on a screen placed at a distance of 100 cm from the slits. It is found that the 9th bright fringe and 3rd dark fringe from the centre are 9mm apart. What is the wavelength of light used?
Answer» In Young's double slit experiment the slits are 0.5 mm apart and interference is observed on a screen placed at a distance of 100 cm from the slits. It is found that the 9th bright fringe and 3rd dark fringe from the centre are 9mm apart. What is the wavelength of light used?

Discussion

43.	If the displacement of a particle executing SHM is given by y = 0.30 sin ( 220t + 0.64 ) in metre, then the frequency and maximum velocity of the particle is [AFMC 1998]
Answer» If the displacement of a particle executing SHM is given by y = 0.30 sin ( 220t + 0.64 ) in metre, then the frequency and maximum velocity of the particle is [AFMC 1998]

43.

If the displacement of a particle executing SHM is given by y = 0.30 sin ( 220t + 0.64 ) in metre, then the frequency and maximum velocity of the particle is [AFMC 1998]

Answer»

If the displacement of a particle executing SHM is given by y = 0.30 sin ( 220t + 0.64 ) in metre, then the frequency and maximum velocity of the particle is

[AFMC 1998]

Discussion

44.	Th position vector of four points A,B,C and D are ^i+^j+^k, 2^i+5^j, 3^i+2^j−3^k, ^i−6^j−^k. Then select the correct relation.
Answer» Th position vector of four points $A, B, C$ and $D$ are $^i +^j +^k, 2^i + 5^j, 3^i + 2^j - 3^k,^i - 6^j -^k$ . Then select the correct relation.

Discussion

45.	The resistivity of a resistor is 5 ohm-m. Its length is 1m and area of cross section is 2mm2. Find the resistance?
Answer» The resistivity of a resistor is 5 ohm-m. Its length is 1m and area of cross section is $2 m m^{2}$ . Find the resistance?

Discussion

46.	A string, fixed at both ends, vibrates in a resonant mode with a separation of 2.0 cm between the consecutive nodes. For the next higher resonant frequency, this separation is reduced to 1.6 cm. Find the length of the string.
Answer» A string, fixed at both ends, vibrates in a resonant mode with a separation of 2.0 cm between the consecutive nodes. For the next higher resonant frequency, this separation is reduced to 1.6 cm. Find the length of the string.

Discussion

47.	Find the equivalent resistance between points A and B in the circuit shown in the diagram? Every resistor shown here is of 2Ω.
Answer» Find the equivalent resistance between points A and B in the circuit shown in the diagram? Every resistor shown here is of $2 Ω$ .

Discussion

48.	The Young’s modulus of brass and steel are 10×1010N m−2 and 2× 1011 N m−2 respectively. A brass wire and a steel wire of the same length are extended by 1 mm under the same force. The radii of the brass and steel wires are RB and Rs respectively. Then
Answer» The Young’s modulus of brass and steel are $10 \times 10^{10} N m^{- 2} a n d 2 \times 10^{11} N m^{- 2}$ respectively. A brass wire and a steel wire of the same length are extended by 1 mm under the same force. The radii of the brass and steel wires are $R_{B}$ and $R_{s}$ respectively. Then

Discussion

49.	Find the dimensions of the rectangle of perimeter 36 cm which will sweep out a volume as large as possible, when revolved about one of its sides. Also, find the maximum volume.
Answer» Find the dimensions of the rectangle of perimeter 36 cm which will sweep out a volume as large as possible, when revolved about one of its sides. Also, find the maximum volume.

Discussion

50.	How is the focal length of a spherical mirror affected when the wavelength of the light used is increased and when it is immersed in a liquid?
Answer» How is the focal length of a spherical mirror affected when the wavelength of the light used is increased and when it is immersed in a liquid?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Explain what is meant by action-reaction pair.

Two blocks m1and m2, are acted upon by the forces F1 and F2 as shown in the fig. If there is no relative sliding between the blocks and the ground is smooth, find the magnitude of static friction between the blocks.Make necessary assumptions.

A light rod of length l=1 m is hinged at its centre and two masses of m1=5 kg and m2=2 kg are hung from the ends as shown in figure. Find the initial angular acceleration of the rod assuming that it was horizontal in beginning. (Take g=10 m/s2)

A string is producing transverse vibration whose equation is y = 0.021 sin ( x + 30 t ) Where x and y are in meters and t is in seconds. If the linear density of the string is 1.3 ×10−4 kg/m, then the tension in the string in N will be [RPET 1999; RPMT 2002]

cos130° cos40° + sin130° sin40° is equal to

A train runs along an unbanked circular track of radius 30 m at a speed of 54 km/h. The mass of the train is 106 kg. What provides the centripetal force required for this purpose - The engine or the rails? What is the angle of banking required to prevent wearing out of the rail?

Two pendula have time periods T and 5T4. They start SHM at the same time from the mean position. The phase difference between them after the pendulum with larger period completes one oscillation is

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

4.0 g of helium occupies 22400 cm3 at STP. The specific heat capacity of helium at constant pressure is 5.0 cal K−1. Calculate the speed of sound in helium at STP.

A uniform circular disc of radius 'R' with a concentric circular hole of radius R2 rolls on a horizontal plane. The fraction of its total energy associated with its rotational motion is

From a stationary tank of mass 125000 pound a small shell of mass 25 pound is fired with a muzzle velocity of 1000 ft/sec. The tank recoils with a velocity of

Two particles are projected simultaneously from the towers of same height as shown in the figure with velocities VA=20 m/s and VB=10 m/s respectively. They collide in air after 0.5 seconds. Find ′θ′. Answer in degrees

Four particles each of mass M, are located at the vertices of a square with side L. The gravitational potential due to this at the centre of the square is

For a projectile on ground, the maximum angle between instantaneous velocity and instantaneous acceleration is _____ and at _______ seconds.

A pole of length 1.00 m stands half dipped in a swimming pool with water level 50.0 cm higher than the bed. The refractive index of water is 1.33 and sunlight is coming at an angle of 45∘ with the vertical. Find the length of the shadow of the pole on the bed.

Following properties will decrease with increase in temperature except

The probability that a certain radioactive atom would get disintegrated in a time equal to the mean life of the radioactive sample is:

A biker is moving with a speed of 15 m/s on a flat road. The coefficient of friction between the wheels of the bike and the road is 0.4. If he approaches a curve, what is the minimum radius of the turn that he can take safely?

On moving a charge of 20 C by 2 cm, 2 J of work is done. Find the potential difference between the two points.

Write the dimensions of the a and b in the equation v=a+bt where v is velocity and t is time

Find the time period of meeting of the minute hand and second hand of a clock. (Initial positions are shown in the figure below)

Choose the correct answer.∫sin2x−cos2xsin2xcos2xdx is equal to (a)tan x+cot x+C(b)tan x+cosec x+C(c)-tan x+cot x+C(d)tan x+sec x+C

A spring of force constant k is cut into two parts whose lengths are in the ratio 1:2. The two parts are now connected in the parallel and a block of mass M is suspended at the end of the combined spring. The time period of oscillation of the block is?

Find the position of the center of mass of a hollow hemisphere of radius R=10 cm. Assume center O as origin.

The moment of inertia of a uniform square plate of mass M and edge of length 'l' about its axis passing through 'P' and perpendicular to it is

The unit of thermal conductivity is

Find the longitudinal stress applied to a steel wire to stretch it by 0.025 % of its original length, if the ratio of longitudinal stress and strain is 9×1010 Nm−2.

On what factors does the magnitude of induced EMF in a coil depends?

A body started with velocity of 20 ms−1 and moving with an acceleration of 2 ms−2. The distance travelled by the body in the 8th second is

A particle executing simple harmonic motion along y-axis has its motion described by the equation. y=Asin(ωt)+B. The amplitude of the simple harmonic motion is

Beckmann thermometers are used to measure

A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?

find the magnitude of two forces such that if they are at right angles their resultant is root 10 Newton what is there at 60 degree their resultant is root 13 Newton

A boy standing on a building of height 20 m throws a stone with a velocity of 15 ms−1. What should be the angle of projection so that the stone has a range of 30 m ? (Take g=10 m/s2)

The phenomenon of Photoelectric effect is used in

The S.I unit of Surface tension is:

In Young's double slit experiment the slits are 0.5 mm apart and interference is observed on a screen placed at a distance of 100 cm from the slits. It is found that the 9th bright fringe and 3rd dark fringe from the centre are 9mm apart. What is the wavelength of light used?

If the displacement of a particle executing SHM is given by y = 0.30 sin ( 220t + 0.64 ) in metre, then the frequency and maximum velocity of the particle is [AFMC 1998]

Th position vector of four points A,B,C and D are ^i+^j+^k, 2^i+5^j, 3^i+2^j−3^k, ^i−6^j−^k. Then select the correct relation.

The resistivity of a resistor is 5 ohm-m. Its length is 1m and area of cross section is 2mm2. Find the resistance?

A string, fixed at both ends, vibrates in a resonant mode with a separation of 2.0 cm between the consecutive nodes. For the next higher resonant frequency, this separation is reduced to 1.6 cm. Find the length of the string.

Find the equivalent resistance between points A and B in the circuit shown in the diagram? Every resistor shown here is of 2Ω.

The Young’s modulus of brass and steel are 10×1010N m−2 and 2× 1011 N m−2 respectively. A brass wire and a steel wire of the same length are extended by 1 mm under the same force. The radii of the brass and steel wires are RB and Rs respectively. Then

Find the dimensions of the rectangle of perimeter 36 cm which will sweep out a volume as large as possible, when revolved about one of its sides. Also, find the maximum volume.

How is the focal length of a spherical mirror affected when the wavelength of the light used is increased and when it is immersed in a liquid?

For a projectile on ground, the maximum angle between instantaneous velocity and instantaneous acceleration is _ and at ___ seconds.