50278 + Interview Questions in Physics

1.	A bar magnet of magnetic moment 1.5 J T–1 lies aligned with thedirection of a uniform magnetic field of 0.22 T.(a) What is the amount of work required by an external torque toturn the magnet so as to align its magnetic moment: (i) normal to the field direction, (ii) opposite to the field direction?(b) What is the torque on the magnet in cases (i) and (ii)?
Answer» A bar magnet of magnetic moment 1.5 J T–1 lies aligned with thedirection of a uniform magnetic field of 0.22 T.(a) What is the amount of work required by an external torque toturn the magnet so as to align its magnetic moment: (i) normal to the field direction, (ii) opposite to the field direction?(b) What is the torque on the magnet in cases (i) and (ii)?

Discussion

2.	Two electrons having charge (−e) each are fixed at a distance ‘2d’. A third charge proton placed at the midpoint is displaced slightly by a distance x (x<<d) perpendicular to the line joining the two fixed charges. Proton will execute simple harmonic motion having angular frequency:(m= mass of charged particle)
Answer» Two electrons having charge $(- e)$ each are fixed at a distance $‘2d’$ . A third charge proton placed at the midpoint is displaced slightly by a distance $x (x<<d)$ perpendicular to the line joining the two fixed charges. Proton will execute simple harmonic motion having angular frequency: $(m =$ mass of charged particle)

Discussion

3.	An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then the wavelength of the emitted light is
Answer» An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then the wavelength of the emitted light is

Discussion

4.	A cylindrical tank has a hole of 2cm^2 at its bottom . if water is allowed to flow into tank from a tube above it at a rate of 100cm^3/s, then find maximum height upto which water can rise up in tank ?
Answer» A cylindrical tank has a hole of 2cm^2 at its bottom . if water is allowed to flow into tank from a tube above it at a rate of 100cm^3/s, then find maximum height upto which water can rise up in tank ?

Discussion

5.	What is the force between two small charged spheres having charges of 2 × 10–7C and 3 × 10–7C placed 30 cm apart in air?
Answer» What is the force between two small charged spheres having charges of 2 × 10–7C and 3 × 10–7C placed 30 cm apart in air?

Discussion

6.	when a resistance of 20ohm connected in parallel with galvanometer then its deflection reduces from 50div to 10 div the resistance of galvanometer is
Answer» when a resistance of 20ohm connected in parallel with galvanometer then its deflection reduces from 50div to 10 div the resistance of galvanometer is

Discussion

7.	At a given instant there are 25% undecayed radioactive nuclei in a samplee. After 10 sec the number of undecayed nuclei reduces to 6.25%, the mean life of the nuclei is
Answer» At a given instant there are 25% undecayed radioactive nuclei in a samplee. After 10 sec the number of undecayed nuclei reduces to 6.25%, the mean life of the nuclei is

Discussion

8.	The force acting between the two charges which are at a distance d apart is F. If a copper plate of thickness d2 is placed between them, then the effective force will be :
Answer» The force acting between the two charges which are at a distance $d$ apart is $F$ . If a copper plate of thickness $\frac{d}{2}$ is placed between them, then the effective force will be :

Discussion

9.	ntA pulley fixed to the ceiling carries a string with blocks of masses m and 3m attatched to its ends.The masses of string and pulley are negligible.When the system is released,the acceleration of centre of mass will ben nta)zeron ntb)-g/4n ntc)g/2n ntd)-g/2n
Answer» ntA pulley fixed to the ceiling carries a string with blocks of masses m and 3m attatched to its ends.The masses of string and pulley are negligible.When the system is released,the acceleration of centre of mass will ben nta)zeron ntb)-g/4n ntc)g/2n ntd)-g/2n

Discussion

10.	Suppose that a rigid body is free to rotate about a fixed point O. If a force →F acts on the body at a point P, then the body will tend to rotate about an axis through O. This effect is measured by the torque vector t which is given by →t=→r×→F. Where →r is the position vector −−→OP. The straight line through O determined by →t is the axis of rotation. The vector →r,→F and →T form a right handed system.The magnitude of the torque (in units) exerted at origin by the force →F=^i+2^j+^k at the point (1,1,1) is
Answer» Suppose that a rigid body is free to rotate about a fixed point $O$ . If a force $\to F$ acts on the body at a point $P$ , then the body will tend to rotate about an axis through $O$ . This effect is measured by the torque vector $t$ which is given by $\to t = \to r \times \to F$ . Where $\to r$ is the position vector $- - \to O P$ . The straight line through $O$ determined by $\to t$ is the axis of rotation. The vector $\to r, \to F$ and $\to T$ form a right handed system. The magnitude of the torque $(in units)$ exerted at origin by the force $\to F =^i + 2^j +^k$ at the point $(1, 1, 1)$ is

Discussion

11.	When 1014 electrons are removed from a neutral metal sphere, the charge on the sphere becomes
Answer» When $10^{14}$ electrons are removed from a neutral metal sphere, the charge on the sphere becomes

Discussion

12.	Find the work done by external agent in moving a 1 C charge from point P to Q in presence of an infinitely long uniformly charged line of linear charge density λ as shown.
Answer» Find the work done by external agent in moving a $1 C$ charge from point P to Q in presence of an infinitely long uniformly charged line of linear charge density $λ$ as shown.

Discussion

13.	The half life of a radioactive sample is T. If the activities of the sample at time t1 and t2 (t1<t2) are R1 and R2 respectively, then the number of atoms disintegrated in time t2−t1 is proportional to-
Answer» The half life of a radioactive sample is $T .$ If the activities of the sample at time $t_{1}$ and $t_{2}$ $(t_{1} < t_{2})$ are $R_{1}$ and $R_{2}$ respectively, then the number of atoms disintegrated in time $t_{2} - t_{1}$ is proportional to-

Discussion

14.	Find the retarding potential required to stop electron of the de broglie wavelength 0.5nm.
Answer» Find the retarding potential required to stop electron of the de broglie wavelength 0.5nm.

Discussion

15.	∫√1+x2x2−x4dx equals to(where C is constant of integration)
Answer» $\int \sqrt{\frac{1 + x^{2}}{x^{2} - x^{4}}} d x$ equals to (where $C$ is constant of integration)

Discussion

16.	What happens when a forward bias is applied to a p-n junction?
Answer» What happens when a forward bias is applied to a p-n junction?

Discussion

17.	How mch force does one coulomb of electric charge exerts on an equal charge placed a dis†an ce of one metre from it
Answer» How mch force does one coulomb of electric charge exerts on an equal charge placed a dis†an ce of one metre from it

Discussion

18.	Question 3:(i) What do you mean by temperature. (ii) Name the device used in measuring the temperature.
Answer» Question 3: (i) What do you mean by temperature. (ii) Name the device used in measuring the temperature.

18.

Question 3:(i) What do you mean by temperature. (ii) Name the device used in measuring the temperature.

Answer»

Question 3:

(i) What do you mean by temperature.

(ii) Name the device used in measuring the temperature.

Discussion

19.	what is theta?
Answer» what is theta?

Discussion

20.	ntA plane reflecting surface is placed in x-z plane, such that it's reflecting surface is normal to y-axis. A ray of light PO is incident at origin O. Find a unit vector along the reflected ray, if the coordinates of point P aren nt(i) (a,a,0);. (ii) (a,b,0);. (iii) (a,b,c)n
Answer» ntA plane reflecting surface is placed in x-z plane, such that it's reflecting surface is normal to y-axis. A ray of light PO is incident at origin O. Find a unit vector along the reflected ray, if the coordinates of point P aren nt(i) (a,a,0);. (ii) (a,b,0);. (iii) (a,b,c)n

Discussion

21.	A12 pF capacitor is connected to a 50V battery. How much electrostaticenergy is stored in the capacitor?
Answer» A 12 pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor?

Discussion

22.	66.A vehicle is moving on a track with constant speed as shown in figure. The apparent weight
Answer» 66.A vehicle is moving on a track with constant speed as shown in figure. The apparent weight

Discussion

23.	A rod of length l=10π m is rotating about a perpendicular bisector passing through its C.O.M and having moment of inertia, π2 kg-m2. If same rod is bent into semi circular arc of radius r as shown in figure and rotated about the same axis in same plane, then moment of inertia of arc will be
Answer» A rod of length $l = 10 π m$ is rotating about a perpendicular bisector passing through its C.O.M and having moment of inertia, $π^{2} {kg-m}^{2}$ . If same rod is bent into semi circular arc of radius $r$ as shown in figure and rotated about the same axis in same plane, then moment of inertia of arc will be

Discussion

24.	Write gauss law for magnetism ?
Answer» Write gauss law for magnetism ?

Discussion

25.	A transverse harmonic wave on a string is described by y(x, t) = 3.0 sin (36 t + 0.018 x + p/4) where x and y are in cm and t in s. The positive direction of x is from left to right. (a) Is this a travelling wave or a stationary wave ? If it is travelling, what are the speed and direction of its propagation ? (b) What are its amplitude and frequency ? (c) What is the initial phase at the origin ? (d) What is the least distance between two successive crests in the wave ?
Answer» A transverse harmonic wave on a string is described by y(x, t) = 3.0 sin (36 t + 0.018 x + p/4) where x and y are in cm and t in s. The positive direction of x is from left to right. (a) Is this a travelling wave or a stationary wave ? If it is travelling, what are the speed and direction of its propagation ? (b) What are its amplitude and frequency ? (c) What is the initial phase at the origin ? (d) What is the least distance between two successive crests in the wave ?

Discussion

26.	An object is to be seen through a simple microscope of focal length 10 cm. Where should the object be placed to produce maximum angular magnification?The least distance for clear vision for the eye is 30 cm.
Answer» An object is to be seen through a simple microscope of focal length $10 cm$ . Where should the object be placed to produce maximum angular magnification? The least distance for clear vision for the eye is $30 cm$ .

Discussion

27.	Use theformulatoexplain why the speed of sound in air(a) is independent of pressure,(b) increases with temperature,(c) increases with humidity.
Answer» Use the formulato explain why the speed of sound in air (a) is independent of pressure, (b) increases with temperature, (c) increases with humidity.

27.

Use theformulatoexplain why the speed of sound in air(a) is independent of pressure,(b) increases with temperature,(c) increases with humidity.

Answer»

Use the
formulato
explain why the speed of sound in air

(a) is independent of pressure,

(b) increases with temperature,

(c) increases with humidity.

Discussion

28.	When a bullet is fired from a gun, which has more momentum? Bullet or gun?
Answer» When a bullet is fired from a gun, which has more momentum? Bullet or gun?

Discussion

29.	A metal ball of mass 1 kg is heated by means of a 20 W heater in a room at 200 C. The temperature of the ball becomes steady at 500 C. (a) Find the rate of loss of heat to the surrounding when the ball is at 500 C (b) Assuming Newton's law of cooling, calculate the rate of loss of heat to the surrounding when the ball is at 300 C. (c) Assume that the temperature of the ball risks uniformly from 200 C to 300 C in 5 minutes. Find the total loss of heat to the surrounding during this period (d) Calculate the specific heat capacity of the metal.
Answer» A metal ball of mass 1 kg is heated by means of a 20 W heater in a room at $20^{0}$ C. The temperature of the ball becomes steady at $50^{0}$ C. (a) Find the rate of loss of heat to the surrounding when the ball is at $50^{0}$ C (b) Assuming Newton's law of cooling, calculate the rate of loss of heat to the surrounding when the ball is at $30^{0}$ C. (c) Assume that the temperature of the ball risks uniformly from $20^{0}$ C to $30^{0}$ C in 5 minutes. Find the total loss of heat to the surrounding during this period (d) Calculate the specific heat capacity of the metal.

Discussion

30.	A person of mass 72kg sitting on ice pushes a block of mass of 30kg on ice horizontally with a speed of 12m/s.the coefficient of friction between the man and ice and between block and ice in 0.02.if g=10m/S2, the distances between man and the block, when they come to rest is a)360m b)10m c)350m d)422.5m
Answer» A person of mass 72kg sitting on ice pushes a block of mass of 30kg on ice horizontally with a speed of 12m/s.the coefficient of friction between the man and ice and between block and ice in 0.02.if g=10m/S2, the distances between man and the block, when they come to rest is a)360m b)10m c)350m d)422.5m

Discussion

31.	In a single slit diffraction experiment, first minimum for red light (660 nm) coincides with first maximum of some other light of wavelength λ. The value of λ in nm is
Answer» In a single slit diffraction experiment, first minimum for red light $(660 nm)$ coincides with first maximum of some other light of wavelength $λ$ . The value of $λ$ in $nm$ is

Discussion

32.	If the ratio of concentration of electrons to that of holes in a semiconductors is 75 and the ratio of currents is 74, what is the ratio of their drift velocities?
Answer» If the ratio of concentration of electrons to that of holes in a semiconductors is $\frac{7}{5}$ and the ratio of currents is $\frac{7}{4}$ , what is the ratio of their drift velocities?

Discussion

33.	A person with near point 25cm using a compound microscope having focal length 8mm and 2.5 cm can bring an object placed at 9mm from the objective in sharp focus.what is the separation between the lenses?calculate the magnifying power of the compound microscope.
Answer» A person with near point 25cm using a compound microscope having focal length 8mm and 2.5 cm can bring an object placed at 9mm from the objective in sharp focus.what is the separation between the lenses?calculate the magnifying power of the compound microscope.

Discussion

34.	A boy of mass 50 kg jumps with a horizontal velocity of 1 m/s on to a stationary cart. If the mass of cart is 5 kg, then the velocity of the boy is (Assuming the friction between the wheels of cart and road is zero)
Answer» A boy of mass 50 kg jumps with a horizontal velocity of 1 m/s on to a stationary cart. If the mass of cart is 5 kg, then the velocity of the boy is (Assuming the friction between the wheels of cart and road is zero)

Discussion

35.	Figure shows an equilateral triangular frame of side L. Frame starts entering into the region of uniform magnetic field B with constant velocity v. If i is instantaneous current through the frame, then the correct graph is. Take anticlockwise current direction to be positive.
Answer» Figure shows an equilateral triangular frame of side L. Frame starts entering into the region of uniform magnetic field B with constant velocity v. If i is instantaneous current through the frame, then the correct graph is. Take anticlockwise current direction to be positive.

Discussion

36.	The trajectory of a projectile is
Answer» The trajectory of a projectile is

Discussion

37.	A square plate of 0.1 m side moves parallel to a second plate with a relative velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 Poise, distance between the plates in m is
Answer» A square plate of $0.1 m$ side moves parallel to a second plate with a relative velocity of $0.1 m/s$ , both plates being immersed in water. If the viscous force is $0.002 N$ and the coefficient of viscosity is $0.01 Poise$ , distance between the plates in $m$ is

Discussion

38.	The isothermal elasticity of a gas is equal to
Answer» The isothermal elasticity of a gas is equal to

Discussion

39.	In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is _____×10−4 A.
Answer» In connection with the circuit drawn below, the value of current flowing through $2 k Ω$ resistor is _____ $\times 10^{- 4} A$ .

Discussion

40.	Figure 13.8 shows plot of PV/T versus P for 1.00×10–3 kg of oxygen gas at two different temperatures . (a) What does the dotted plot signify? (b) Which is true: T1 > T2 or T1 < T2? (c) What is the value of PV/T where the curves meet on the y-axis? (d) If we obtained similar plots for 1.00×10–3 kg of hydrogen, would we get the same value of PV/T at the point where the curves meet on the y-axis? If not, what mass of hydrogen yields the same value of PV/T (for low pressure high temperature region of the plot) ? (Molecular mass of H₂ = 2.02 u, of O₂ = 32.0 u, R = 8.31 J mo1¯¹ K¯¹.)
Answer» Figure 13.8 shows plot of PV/T versus P for 1.00×10–3 kg of oxygen gas at two different temperatures . (a) What does the dotted plot signify? (b) Which is true: T1 > T2 or T1 < T2? (c) What is the value of PV/T where the curves meet on the y-axis? (d) If we obtained similar plots for 1.00×10–3 kg of hydrogen, would we get the same value of PV/T at the point where the curves meet on the y-axis? If not, what mass of hydrogen yields the same value of PV/T (for low pressure high temperature region of the plot) ? (Molecular mass of H₂ = 2.02 u, of O₂ = 32.0 u, R = 8.31 J mo1¯¹ K¯¹.)

Discussion

41.	What should be the angular speed with which the earth must rotate on its axis so that a person on the equator would weigh 35th of weight measured without considering earth's rotation ? (Take R as the equatorial radius and g as acceleration due to gravity)
Answer» What should be the angular speed with which the earth must rotate on its axis so that a person on the equator would weigh $\frac{3}{5}$ th of weight measured without considering earth's rotation ? (Take $R$ as the equatorial radius and $g$ as acceleration due to gravity)

Discussion

42.	One mole of an ideal monoatomic gas undergoes a process as shown in the figure. Find the molar specific heat of the gas in the process (R is a gas constant).
Answer» One mole of an ideal monoatomic gas undergoes a process as shown in the figure. Find the molar specific heat of the gas in the process ( $R$ is a gas constant).

Discussion

43.	Electric field in the given region is vertically downwards. An open hemisphere of radius a is placed as shown. Find the net flux of electric field through the curved surface of hemisphere.
Answer» Electric field in the given region is vertically downwards. An open hemisphere of radius $a$ is placed as shown. Find the net flux of electric field through the curved surface of hemisphere.

43.

Electric field in the given region is vertically downwards. An open hemisphere of radius a is placed as shown. Find the net flux of electric field through the curved surface of hemisphere.

Answer»

Electric field in the given region is vertically downwards. An open hemisphere of radius $a$ is placed as shown. Find the net flux of electric field through the curved surface of hemisphere.

Discussion

44.	Why the Mercury thermometer has a cylindrical bulb instead of a spherical one?
Answer» Why the Mercury thermometer has a cylindrical bulb instead of a spherical one?

Discussion

45.	In a young's double slit experiment d = 1mm, λ=6000A0 and D - 1m (where d, λ D have usual meaning) . Each of slit individually produces the same intensity on the screen. The minimum distance between two points on the screen having 75% intensity of the maximum intensity is k10 mm. The value of K is ___
Answer» In a young's double slit experiment d = 1mm, $λ = 6000 A^{0}$ and D - 1m (where d, $λ$ D have usual meaning) . Each of slit individually produces the same intensity on the screen. The minimum distance between two points on the screen having 75% intensity of the maximum intensity is $\frac{k}{10}$ mm. The value of K is ___

Discussion

46.	The diffusion current in a P-Njunction is-
Answer» The diffusion current in a P-N junction is-

46.

The diffusion current in a P-Njunction is-

Answer»

The diffusion current in a P-N
junction is-

Discussion

47.	62. Percentage error in measuring the radius and Mass of a solid sphere are 2% & 1% respectively. Then the error in measurement of moment of inertia about to its diameter is
Answer» 62. Percentage error in measuring the radius and Mass of a solid sphere are 2% & 1% respectively. Then the error in measurement of moment of inertia about to its diameter is

Discussion

48.	ntThe gravitational field is given by E (4i+j). Work done by this field is zero when the particle is moved along the line. (1) y + 4x = 2 (2) 4y + x = 6 (3) x + y = 5 (4) All of thesen
Answer» ntThe gravitational field is given by E (4i+j). Work done by this field is zero when the particle is moved along the line. (1) y + 4x = 2 (2) 4y + x = 6 (3) x + y = 5 (4) All of thesen

Discussion

49.	A block of mass 5 kg executes simple harmonic motion under the restoring force of a spring. The amplitude and the time period of the motion are 0.1 m and 3.14 s respectively. Find the maximum force exerted by the spring on the block.
Answer» A block of mass 5 kg executes simple harmonic motion under the restoring force of a spring. The amplitude and the time period of the motion are 0.1 m and 3.14 s respectively. Find the maximum force exerted by the spring on the block.

Discussion

50.	A ball of mass 2 kg is tied to a string 3 m long and is rotated at a constant speed of 30 m/s in a vertical circle. The ratio of the tensions at the top and bottom is (Take g=10 m/s2)
Answer» A ball of mass $2 kg$ is tied to a string $3 m$ long and is rotated at a constant speed of $30 m/s$ in a vertical circle. The ratio of the tensions at the top and bottom is (Take $g = 10 {m/s}^{2}$ )

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then the wavelength of the emitted light is

A cylindrical tank has a hole of 2cm^2 at its bottom . if water is allowed to flow into tank from a tube above it at a rate of 100cm^3/s, then find maximum height upto which water can rise up in tank ?

What is the force between two small charged spheres having charges of 2 × 10–7C and 3 × 10–7C placed 30 cm apart in air?

when a resistance of 20ohm connected in parallel with galvanometer then its deflection reduces from 50div to 10 div the resistance of galvanometer is

At a given instant there are 25% undecayed radioactive nuclei in a samplee. After 10 sec the number of undecayed nuclei reduces to 6.25%, the mean life of the nuclei is

The force acting between the two charges which are at a distance d apart is F. If a copper plate of thickness d2 is placed between them, then the effective force will be :

ntA pulley fixed to the ceiling carries a string with blocks of masses m and 3m attatched to its ends.The masses of string and pulley are negligible.When the system is released,the acceleration of centre of mass will ben nta)zeron ntb)-g/4n ntc)g/2n ntd)-g/2n

When 1014 electrons are removed from a neutral metal sphere, the charge on the sphere becomes

Find the work done by external agent in moving a 1 C charge from point P to Q in presence of an infinitely long uniformly charged line of linear charge density λ as shown.

The half life of a radioactive sample is T. If the activities of the sample at time t1 and t2 (t1&lt;t2) are R1 and R2 respectively, then the number of atoms disintegrated in time t2−t1 is proportional to-

Find the retarding potential required to stop electron of the de broglie wavelength 0.5nm.

∫√1+x2x2−x4dx equals to(where C is constant of integration)

What happens when a forward bias is applied to a p-n junction?

How mch force does one coulomb of electric charge exerts on an equal charge placed a dis†an ce of one metre from it

Question 3:(i) What do you mean by temperature. (ii) Name the device used in measuring the temperature.

what is theta?

ntA plane reflecting surface is placed in x-z plane, such that it's reflecting surface is normal to y-axis. A ray of light PO is incident at origin O. Find a unit vector along the reflected ray, if the coordinates of point P aren nt(i) (a,a,0);. (ii) (a,b,0);. (iii) (a,b,c)n

A12 pF capacitor is connected to a 50V battery. How much electrostaticenergy is stored in the capacitor?

66.A vehicle is moving on a track with constant speed as shown in figure. The apparent weight

A rod of length l=10π m is rotating about a perpendicular bisector passing through its C.O.M and having moment of inertia, π2 kg-m2. If same rod is bent into semi circular arc of radius r as shown in figure and rotated about the same axis in same plane, then moment of inertia of arc will be

Write gauss law for magnetism ?

An object is to be seen through a simple microscope of focal length 10 cm. Where should the object be placed to produce maximum angular magnification?The least distance for clear vision for the eye is 30 cm.

Use theformulatoexplain why the speed of sound in air(a) is independent of pressure,(b) increases with temperature,(c) increases with humidity.

When a bullet is fired from a gun, which has more momentum? Bullet or gun?

In a single slit diffraction experiment, first minimum for red light (660 nm) coincides with first maximum of some other light of wavelength λ. The value of λ in nm is

If the ratio of concentration of electrons to that of holes in a semiconductors is 75 and the ratio of currents is 74, what is the ratio of their drift velocities?

A person with near point 25cm using a compound microscope having focal length 8mm and 2.5 cm can bring an object placed at 9mm from the objective in sharp focus.what is the separation between the lenses?calculate the magnifying power of the compound microscope.

A boy of mass 50 kg jumps with a horizontal velocity of 1 m/s on to a stationary cart. If the mass of cart is 5 kg, then the velocity of the boy is (Assuming the friction between the wheels of cart and road is zero)

Figure shows an equilateral triangular frame of side L. Frame starts entering into the region of uniform magnetic field B with constant velocity v. If i is instantaneous current through the frame, then the correct graph is. Take anticlockwise current direction to be positive.

The trajectory of a projectile is

A square plate of 0.1 m side moves parallel to a second plate with a relative velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 Poise, distance between the plates in m is

The isothermal elasticity of a gas is equal to

In connection with the circuit drawn below, the value of current flowing through 2 kΩ resistor is _____×10−4 A.

What should be the angular speed with which the earth must rotate on its axis so that a person on the equator would weigh 35th of weight measured without considering earth's rotation ? (Take R as the equatorial radius and g as acceleration due to gravity)

One mole of an ideal monoatomic gas undergoes a process as shown in the figure. Find the molar specific heat of the gas in the process (R is a gas constant).

Electric field in the given region is vertically downwards. An open hemisphere of radius a is placed as shown. Find the net flux of electric field through the curved surface of hemisphere.

Why the Mercury thermometer has a cylindrical bulb instead of a spherical one?

The diffusion current in a P-Njunction is-

62. Percentage error in measuring the radius and Mass of a solid sphere are 2% & 1% respectively. Then the error in measurement of moment of inertia about to its diameter is

ntThe gravitational field is given by E (4i+j). Work done by this field is zero when the particle is moved along the line. (1) y + 4x = 2 (2) 4y + x = 6 (3) x + y = 5 (4) All of thesen

A block of mass 5 kg executes simple harmonic motion under the restoring force of a spring. The amplitude and the time period of the motion are 0.1 m and 3.14 s respectively. Find the maximum force exerted by the spring on the block.

A ball of mass 2 kg is tied to a string 3 m long and is rotated at a constant speed of 30 m/s in a vertical circle. The ratio of the tensions at the top and bottom is (Take g=10 m/s2)

The half life of a radioactive sample is T. If the activities of the sample at time t1 and t2 (t1<t2) are R1 and R2 respectively, then the number of atoms disintegrated in time t2−t1 is proportional to-