50278 + Interview Questions in Physics

1.	A particle executes SHM with a period of T second and amplitude A metre. The particle is at its mean position initially The shortest time it takes to reach point A√2 metre from its mean position in seconds is
Answer» A particle executes SHM with a period of $T$ second and amplitude $A$ metre. The particle is at its mean position initially The shortest time it takes to reach point $\frac{A}{\sqrt{2}}$ metre from its mean position in seconds is

Discussion

2.	Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant K. The blocks are initially resting on a smooth horizontal floor with spring at its natural length as shown in the figure. A third identical block C, also of mass m, moves on the floor with a speed v along the line joining A and B and collides with A. Then,
Answer» Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant K. The blocks are initially resting on a smooth horizontal floor with spring at its natural length as shown in the figure. A third identical block C, also of mass m, moves on the floor with a speed v along the line joining A and B and collides with A. Then,

2.

Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant K. The blocks are initially resting on a smooth horizontal floor with spring at its natural length as shown in the figure. A third identical block C, also of mass m, moves on the floor with a speed v along the line joining A and B and collides with A. Then,

Answer»

Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant K. The blocks are initially resting on a smooth horizontal floor with spring at its natural length as shown in the figure. A third identical block C, also of mass m, moves on the floor with a speed v along the line joining A and B and collides with A. Then,

Discussion

3.	A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5m/s2, the reading of the spring balance ( in N) will be
Answer» A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads $49 N$ , when the lift is stationary. If the lift moves downward with an acceleration of $5 {m/s}^{2}$ , the reading of the spring balance ( in $N$ ) will be

Discussion

4.	Two equal negative charge – q are fixed at the fixed points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point on the X-axis. The charge Q will
Answer» Two equal negative charge – q are fixed at the fixed points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point on the X-axis. The charge Q will

Discussion

5.	When the door of a refrigerator is kept open, then the room temperature starts OPTIONS a) cool down b) hot up [Dear mentor please give the detailed solution]
Answer» When the door of a refrigerator is kept open, then the room temperature starts OPTIONS a) cool down b) hot up [Dear mentor please give the detailed solution]

5.

When the door of a refrigerator is kept open, then the room temperature starts OPTIONS a) cool down b) hot up [Dear mentor please give the detailed solution]

Answer»

When the door of a refrigerator is kept open, then the room temperature starts

OPTIONS

a) cool down

b) hot up

[Dear mentor please give the detailed solution]

Discussion

6.	A particle hanging from a spring stretches it by 1 cm at earth's surface. How much will the same particle stretch the spring at a place 800 km above the earth's surface? Radius of the earth = 6400 km.
Answer» A particle hanging from a spring stretches it by 1 cm at earth's surface. How much will the same particle stretch the spring at a place 800 km above the earth's surface? Radius of the earth = 6400 km.

Discussion

7.	How does the fringe width of interference fringes change wjen the whole apparatus of young's experiment is kept in water.(mu=4/3)
Answer» How does the fringe width of interference fringes change wjen the whole apparatus of young's experiment is kept in water.(mu=4/3)

Discussion

8.	A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity 17 ms−1. The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 ms−1)
Answer» A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity 17 m $s^{- 1}$ . The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 m $s^{- 1}$ )

8.

A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity 17 ms−1. The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 ms−1)

Answer»

A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity 17 m $s^{- 1}$ . The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 m $s^{- 1}$ )

Discussion

9.	The input voltage applied to a cascaded amplifier (consisting of two amplifiers) is 0.02 V and the output voltage is 6 V. The voltage gain of one of the two amplifiers is 10. What is the voltage gain of the other amplifier?
Answer» The input voltage applied to a cascaded amplifier (consisting of two amplifiers) is 0.02 V and the output voltage is 6 V. The voltage gain of one of the two amplifiers is 10. What is the voltage gain of the other amplifier?

Discussion

10.	A particle moves from a point →r1=2^i+3^j(m) to another point →r2=3^i+2^j(m) during which a certain force →F=5^i+5^j acts on it. Find the work done by the force on the particle during the displacement. ___
Answer» A particle moves from a point ${\to r}_{1} = 2^i + 3^j (m)$ to another point ${\to r}_{2} = 3^i + 2^j (m)$ during which a certain force $\to F = 5^i + 5^j$ acts on it. Find the work done by the force on the particle during the displacement. ___

Discussion

11.	A particle moves in a circle with a constant speed of 6m /s. Its centripetal acceleration is 120 m/s2, The radius of the circle is
Answer» A particle moves in a circle with a constant speed of 6m /s. Its centripetal acceleration is 120 m/s², The radius of the circle is

Discussion

12.	A car moving in a horizontal road may be thrown out of the road in taking a turn this is because of lack of centripetal force but why not friction between the road and tyre??
Answer» A car moving in a horizontal road may be thrown out of the road in taking a turn this is because of lack of centripetal force but why not friction between the road and tyre??

Discussion

13.	If 20 cm3 gas at 1 atm. is expanded to 50 cm3 at constant T, then what is the final pressure
Answer» If $20 c m^{3}$ gas at 1 atm. is expanded to $50 c m^{3}$ at constant T, then what is the final pressure

Discussion

14.	A man of mass 60 kg is standing on a platform which is oscillating up and down with frequency 2 Hz and amplitude 50 cm. A machine on the platform indicates weight of the man with respect to time, then the maximum reading of the machine will be (g=10m/s2)
Answer» A man of mass 60 kg is standing on a platform which is oscillating up and down with frequency 2 Hz and amplitude 50 cm. A machine on the platform indicates weight of the man with respect to time, then the maximum reading of the machine will be $(g = 10 m / s^{2})$

Discussion

15.	According to De Broglie the electron in n=3 of Li++ atom will look like
Answer» According to De Broglie the electron in n=3 of $L i^{+ +}$ atom will look like

Discussion

16.	Two blocks are connected by a spring, the combination is suspended at rest, from a string attached to the ceiling, as shown in the figure, the string breaks suddenly. Immediately after the string breaks, what is the initial downward acceleration of the upper block of mass 2m?
Answer» Two blocks are connected by a spring, the combination is suspended at rest, from a string attached to the ceiling, as shown in the figure, the string breaks suddenly. Immediately after the string breaks, what is the initial downward acceleration of the upper block of mass 2m?

Discussion

17.	Find the minimum and maximum wavelengths of sound in water that is in the audible range (20 - 20000 Hz) for an average human ear. Speed of sound in water = 1450 m s−1.
Answer» Find the minimum and maximum wavelengths of sound in water that is in the audible range (20 - 20000 Hz) for an average human ear. Speed of sound in water = 1450 m s $^{- 1}$ .

Discussion

18.	A nucleus AZX going through a β+ decay will end up taking what configuration?
Answer» A nucleus $_{Z}^{A} X$ going through a $β^{+}$ decay will end up taking what configuration?

Discussion

19.	A geostationary satellite
Answer» A geostationary satellite

Discussion

20.	You have a test tube of length 14 cm. You blow in it and form standing waves. Can you tell the fundamental frequency of standing wave formed in the tube if it was half filled with ice. (i) for diagram 1 (ii) for diagram 2 Given v = 336 ms
Answer» You have a test tube of length 14 cm. You blow in it and form standing waves. Can you tell the fundamental frequency of standing wave formed in the tube if it was half filled with ice. (i) for diagram 1 (ii) for diagram 2 Given v = 336 $\frac{m}{s}$

20.

You have a test tube of length 14 cm. You blow in it and form standing waves. Can you tell the fundamental frequency of standing wave formed in the tube if it was half filled with ice. (i) for diagram 1 (ii) for diagram 2 Given v = 336 ms

Answer»

You have a test tube of length 14 cm. You blow in it and form standing waves. Can you tell the fundamental frequency of standing wave formed in the tube if it was half filled with ice. (i) for diagram 1 (ii) for diagram 2

Given v = 336 $\frac{m}{s}$

Discussion

21.	A healthy youngman standing at a distance of 7 m from 11.8 m high building sees a kid slipping from the top floor. With what speed (assumed uniform) should he run to catch the kid at the arms height (1.8)m ?
Answer» A healthy youngman standing at a distance of 7 m from 11.8 m high building sees a kid slipping from the top floor. With what speed (assumed uniform) should he run to catch the kid at the arms height (1.8)m ?

Discussion

22.	A small creatures moves with constant speed in a small vertical circle on a bright day. Does its shadow formed by the sun on a horizontal plane move in a simple harmonic motion?
Answer» A small creatures moves with constant speed in a small vertical circle on a bright day. Does its shadow formed by the sun on a horizontal plane move in a simple harmonic motion?

Discussion

23.	A ball is projected from a point on the floor with a speed of 15 m/s at an angle of 602 with the horizontal. Will it hit a vertical wall 5 m away from the point of projection and perpendicular to the plane of project ionm without hitting the floor ? Will the answer differ if the wall is 22 m away ?
Answer» A ball is projected from a point on the floor with a speed of 15 m/s at an angle of $60^{2}$ with the horizontal. Will it hit a vertical wall 5 m away from the point of projection and perpendicular to the plane of project ionm without hitting the floor ? Will the answer differ if the wall is 22 m away ?

Discussion

24.	The descending pulley shown in figure (10-E7) has a radius 20 cm and moment of inertia 0.20 kg-m2. The fixed pulley is light and the horizontal plane frictionless. Find the acceleration of the block if its mass is 1.0 kg.
Answer» The descending pulley shown in figure (10-E7) has a radius 20 cm and moment of inertia 0.20 kg-m $^{2}$ . The fixed pulley is light and the horizontal plane frictionless. Find the acceleration of the block if its mass is 1.0 kg.

24.

The descending pulley shown in figure (10-E7) has a radius 20 cm and moment of inertia 0.20 kg-m2. The fixed pulley is light and the horizontal plane frictionless. Find the acceleration of the block if its mass is 1.0 kg.

Answer»

The descending pulley shown in figure (10-E7) has a radius 20 cm and moment of inertia 0.20 kg-m $^{2}$ . The fixed pulley is light and the horizontal plane frictionless. Find the acceleration of the block if its mass is 1.0 kg.

Discussion

25.	Emission or Absorption spectra experiment is performed with
Answer» Emission or Absorption spectra experiment is performed with

Discussion

26.	A cube of side 1 m whose base is rigidly fixed to the surface in contact is given a charge Q=2 C at its top surface. [Charge is uniformly distributed on top surface only]. Electric field of 50 N/C also exist as shown in figure. Elastic energy stored in cube if modulus of rigidity is 3×1010 N/m2 is x×10−8 J. Find x upto two decimal points
Answer» A cube of side $1 m$ whose base is rigidly fixed to the surface in contact is given a charge $Q = 2 C$ at its top surface. [Charge is uniformly distributed on top surface only]. Electric field of $50 N / C$ also exist as shown in figure. Elastic energy stored in cube if modulus of rigidity is $3 \times 10^{10} N / m^{2} i s x \times 10^{- 8} J .$ Find $x$ upto two decimal points

Discussion

27.	Magnitude of magnetic dipole moment of loop as shown in figure is? Each curve is of radius R.
Answer» Magnitude of magnetic dipole moment of loop as shown in figure is? Each curve is of radius R.

Discussion

28.	A pendulum clock that keeps correct time on the earth is taken to the moon. It runs √6 times ___.
Answer» A pendulum clock that keeps correct time on the earth is taken to the moon. It runs $\sqrt{6}$ times ___.

Discussion

29.	When a 12 Ω resistor is shunted with a moving coil galvanometer, its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
Answer» When a 12 $Ω$ resistor is shunted with a moving coil galvanometer, its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is

Discussion

30.	A parallel beam of fast moving electrons is incident normally on a narrow slit. A ﬂuorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following is correct?
Answer» A parallel beam of fast moving electrons is incident normally on a narrow slit. A ﬂuorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following is correct?

Discussion

31.	A pendulum is made from a massless rod of length L and bob of mass m. A spring of force constant k is connected horizontally to it at a distance h below its point of suspension as shown. The rod is in equilibrium in vertical position. The frequency of vibration of the system for small values of θ is :
Answer» A pendulum is made from a massless rod of length $L$ and bob of mass $m$ . A spring of force constant $k$ is connected horizontally to it at a distance $h$ below its point of suspension as shown. The rod is in equilibrium in vertical position. The frequency of vibration of the system for small values of $θ$ is :

31.

A pendulum is made from a massless rod of length L and bob of mass m. A spring of force constant k is connected horizontally to it at a distance h below its point of suspension as shown. The rod is in equilibrium in vertical position. The frequency of vibration of the system for small values of θ is :

Answer»

A pendulum is made from a massless rod of length $L$ and bob of mass $m$ . A spring of force constant $k$ is connected horizontally to it at a distance $h$ below its point of suspension as shown. The rod is in equilibrium in vertical position. The frequency of vibration of the system for small values of $θ$ is :

Discussion

32.	The mass of the body on the moon is 40 kg. What will be the weight of the same body on the earth?
Answer» The mass of the body on the moon is $40 k g$ . What will be the weight of the same body on the earth?

32.

The mass of the body on the moon is 40 kg. What will be the weight of the same body on the earth?

Answer»

The mass of the body on the moon is $40 k g$ . What will be the weight of the same body on the earth?

Discussion

33.	The angular velocity of the second's hand in a watch is
Answer» The angular velocity of the second's hand in a watch is

Discussion

34.	Find the slope of the tangent to the curve y=2√x at the point (2,1).
Answer» Find the slope of the tangent to the curve $y = 2 \sqrt{x}$ at the point $(2, 1)$ .

Discussion

35.	A battery EA of 123 V emf and internal resistance 0.4 Ω and a battery EB of 117 V emf and internal resistance 0.6 Ω supplies a current to load resistance RL through four wires of resistors RA=1.2 Ω,RB=1 Ω,RC=1.4 Ω and RD=1.4 Ω as shown in figure. The value of load resistance for maximum load power is
Answer» A battery $E_{A}$ of $123 V$ emf and internal resistance $0.4 Ω$ and a battery $E_{B}$ of $117 V$ emf and internal resistance $0.6 Ω$ supplies a current to load resistance $R_{L}$ through four wires of resistors $R_{A} = 1.2 Ω, R_{B} = 1 Ω, R_{C} = 1.4 Ω$ and $R_{D} = 1.4 Ω$ as shown in figure. The value of load resistance for maximum load power is

Discussion

36.	Potential in the x-y plane is given as V=5(x2+xy) volts. The electrict field at the point (1-2) will be
Answer» Potential in the x-y plane is given as $V = 5 (x^{2} + x y)$ volts. The electrict field at the point (1-2) will be

Discussion

37.	Which of the following forces is non conservative one?
Answer» Which of the following forces is non conservative one?

Discussion

38.	Time period of a simple pendulum measured inside a stationary lift is T. If the lift starts moving upwards with an acceleration of g3, what will be its time period:
Answer» Time period of a simple pendulum measured inside a stationary lift is T. If the lift starts moving upwards with an acceleration of $\frac{g}{3}$ , what will be its time period:

Discussion

39.	A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector →a is correctly shown in (see figure.)
Answer» A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector $\to a$ is correctly shown in (see figure.)

Discussion

40.	A man wishes to cross river flowing at 10 m/s via path AB as shown in the figure. Minimum speed (in m/s) required for swimmer to follow the given path with respect to river flow is .
Answer» A man wishes to cross river flowing at 10 m/s via path AB as shown in the figure. Minimum speed (in m/s) required for swimmer to follow the given path with respect to river flow is .

Discussion

41.	For a photo electric experiment the relation between applied potential difference between cathode and anode (V) and the photo electric current (I) was found be as shown in fig. What is the frequency of incident radiation would be nearly (h=6.6×10−34Js)
Answer» For a photo electric experiment the relation between applied potential difference between cathode and anode (V) and the photo electric current (I) was found be as shown in fig. What is the frequency of incident radiation would be nearly $(h = 6.6 \times 10^{- 34} J s)$

Discussion

42.	A pump is required to lift 1000 kg of water per minute from a well 20 m deep and eject it at a rate of 20 ms−1. What HP (horsepower) engine is required for the purpose of lifting water?
Answer» A pump is required to lift $1000 kg$ of water per minute from a well $20 m$ deep and eject it at a rate of $20 {ms}^{- 1} .$ What HP (horsepower) engine is required for the purpose of lifting water?

Discussion

43.	If 0≤x≤π2 and 81sin2x+81cos2x=30 then x is equal to
Answer» If $0 \leq x \leq \frac{π}{2}$ and $81^{s i n^{2} x} + 81^{c o s^{2} x} = 30$ then x is equal to

Discussion

44.	The field lines for single negative charge are:
Answer» The field lines for single negative charge are:

44.

The field lines for single negative charge are:

Answer»

The field lines for single negative charge are:

Discussion

45.	The value of tan−1(1√3)−sec−1(2√3) is equal to (a) 0 (b) π6 (c) π3 (d) π2
Answer» The value of ${tan}^{- 1} (\frac{1}{\sqrt{3}}) - {sec}^{- 1} (\frac{2}{\sqrt{3}})$ is equal to $(a) 0 (b) \frac{π}{6}$ $(c) \frac{π}{3} (d) \frac{π}{2}$

Discussion

46.	The length of the wire is increased by 1 mm on the application of a given load. In a wire of the same material but of length and radius twice that of the first, on application of the same force, extension produced is
Answer» The length of the wire is increased by 1 mm on the application of a given load. In a wire of the same material but of length and radius twice that of the first, on application of the same force, extension produced is

Discussion

47.	A man X can hear only upto 10 kHz and another man Y upto 20 kHz. A note of frequency 500 Hz is produced before them from a stretched string. Then
Answer» A man $X$ can hear only upto 10 kHz and another man $Y$ upto 20 kHz. A note of frequency 500 Hz is produced before them from a stretched string. Then

Discussion

48.	If y=lnxx, then dydx will be
Answer» If $y = \frac{ln x}{x}$ , then $\frac{d y}{d x}$ will be

Discussion

49.	The mid-value of 1 and 1/2 is :
Answer» The mid-value of 1 and 1/2 is :

Discussion

50.	A train moving at a speed of 30 m/s has just completed a U-curve in a semi-circular track. The engine is at the forward end of the semi-circular part of the track while the last carriage is at the rear end of the semi-circular track. The driver blows a whistle of frequency 200 Hz. If the velocity of sound is 340 m/s, then the apparent frequency as observed by a passenger in the middle of the train is
Answer» A train moving at a speed of $30 m/s$ has just completed a U-curve in a semi-circular track. The engine is at the forward end of the semi-circular part of the track while the last carriage is at the rear end of the semi-circular track. The driver blows a whistle of frequency $200 Hz$ . If the velocity of sound is $340 m/s$ , then the apparent frequency as observed by a passenger in the middle of the train is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A particle executes SHM with a period of T second and amplitude A metre. The particle is at its mean position initially The shortest time it takes to reach point A√2 metre from its mean position in seconds is

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5m/s2, the reading of the spring balance ( in N) will be

Two equal negative charge – q are fixed at the fixed points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point on the X-axis. The charge Q will

When the door of a refrigerator is kept open, then the room temperature starts OPTIONS​ a) cool down b) hot up [Dear mentor please give the detailed solution]

A particle hanging from a spring stretches it by 1 cm at earth's surface. How much will the same particle stretch the spring at a place 800 km above the earth's surface? Radius of the earth = 6400 km.

How does the fringe width of interference fringes change wjen the whole apparatus of young's experiment is kept in water.(mu=4/3)

A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity 17 ms−1. The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 ms−1)

The input voltage applied to a cascaded amplifier (consisting of two amplifiers) is 0.02 V and the output voltage is 6 V. The voltage gain of one of the two amplifiers is 10. What is the voltage gain of the other amplifier?

A particle moves from a point →r1=2^i+3^j(m) to another point →r2=3^i+2^j(m) during which a certain force →F=5^i+5^j acts on it. Find the work done by the force on the particle during the displacement. ___

A particle moves in a circle with a constant speed of 6m /s. Its centripetal acceleration is 120 m/s2, The radius of the circle is

A car moving in a horizontal road may be thrown out of the road in taking a turn this is because of lack of centripetal force but why not friction between the road and tyre??

If 20 cm3 gas at 1 atm. is expanded to 50 cm3 at constant T, then what is the final pressure

A man of mass 60 kg is standing on a platform which is oscillating up and down with frequency 2 Hz and amplitude 50 cm. A machine on the platform indicates weight of the man with respect to time, then the maximum reading of the machine will be (g=10m/s2)

According to De Broglie the electron in n=3 of Li++ atom will look like

Two blocks are connected by a spring, the combination is suspended at rest, from a string attached to the ceiling, as shown in the figure, the string breaks suddenly. Immediately after the string breaks, what is the initial downward acceleration of the upper block of mass 2m?

Find the minimum and maximum wavelengths of sound in water that is in the audible range (20 - 20000 Hz) for an average human ear. Speed of sound in water = 1450 m s−1.

A nucleus AZX going through a β+ decay will end up taking what configuration?

A geostationary satellite

You have a test tube of length 14 cm. You blow in it and form standing waves. Can you tell the fundamental frequency of standing wave formed in the tube if it was half filled with ice. (i) for diagram 1 (ii) for diagram 2 Given v = 336 ms

A healthy youngman standing at a distance of 7 m from 11.8 m high building sees a kid slipping from the top floor. With what speed (assumed uniform) should he run to catch the kid at the arms height (1.8)m ?

A small creatures moves with constant speed in a small vertical circle on a bright day. Does its shadow formed by the sun on a horizontal plane move in a simple harmonic motion?

A ball is projected from a point on the floor with a speed of 15 m/s at an angle of 602 with the horizontal. Will it hit a vertical wall 5 m away from the point of projection and perpendicular to the plane of project ionm without hitting the floor ? Will the answer differ if the wall is 22 m away ?

The descending pulley shown in figure (10-E7) has a radius 20 cm and moment of inertia 0.20 kg-m2. The fixed pulley is light and the horizontal plane frictionless. Find the acceleration of the block if its mass is 1.0 kg.

Emission or Absorption spectra experiment is performed with

Magnitude of magnetic dipole moment of loop as shown in figure is? Each curve is of radius R.

A pendulum clock that keeps correct time on the earth is taken to the moon. It runs √6 times ___.

When a 12 Ω resistor is shunted with a moving coil galvanometer, its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is

A parallel beam of fast moving electrons is incident normally on a narrow slit. A ﬂuorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following is correct?

The mass of the body on the moon is 40 kg. What will be the weight of the same body on the earth?

The angular velocity of the second's hand in a watch is

Find the slope of the tangent to the curve y=2√x at the point (2,1).

Potential in the x-y plane is given as V=5(x2+xy) volts. The electrict field at the point (1-2) will be

Which of the following forces is non conservative one?

Time period of a simple pendulum measured inside a stationary lift is T. If the lift starts moving upwards with an acceleration of g3, what will be its time period:

A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector →a is correctly shown in (see figure.)

A man wishes to cross river flowing at 10 m/s via path AB as shown in the figure. Minimum speed (in m/s) required for swimmer to follow the given path with respect to river flow is .

For a photo electric experiment the relation between applied potential difference between cathode and anode (V) and the photo electric current (I) was found be as shown in fig. What is the frequency of incident radiation would be nearly (h=6.6×10−34Js)

A pump is required to lift 1000 kg of water per minute from a well 20 m deep and eject it at a rate of 20 ms−1. What HP (horsepower) engine is required for the purpose of lifting water?

If 0≤x≤π2 and 81sin2x+81cos2x=30 then x is equal to

The field lines for single negative charge are:

The value of tan−1(1√3)−sec−1(2√3) is equal to (a) 0 (b) π6 (c) π3 (d) π2

The length of the wire is increased by 1 mm on the application of a given load. In a wire of the same material but of length and radius twice that of the first, on application of the same force, extension produced is

A man X can hear only upto 10 kHz and another man Y upto 20 kHz. A note of frequency 500 Hz is produced before them from a stretched string. Then

If y=lnxx, then dydx will be

The mid-value of 1 and 1/2 is :

When the door of a refrigerator is kept open, then the room temperature starts OPTIONS a) cool down b) hot up [Dear mentor please give the detailed solution]