50278 + Interview Questions in Physics Page 260 InterviewSolution

12951.	What double titration ? Explain in brief.
Answer» What double titration ? Explain in brief.

Discussion

12952.	A bird is flying 3 m above the surface of water of refractive index 4/3 If the bird is diving vertically down with speed 6 m/s, his apparent velocity as seen by a stationary fish underwater (in m/s) is:
Answer» A bird is flying $3 m$ above the surface of water of refractive index $4 / 3$ If the bird is diving vertically down with speed $6 m / s$ , his apparent velocity as seen by a stationary fish underwater (in $m / s$ ) is:

Discussion

12953.	The height y and distance x along the horizontal plane of a projectile on a certain planet are given by x =6t m and y=(8t-5t)m.The velocity with which the projectile is projected is
Answer» The height y and distance x along the horizontal plane of a projectile on a certain planet are given by x =6t m and y=(8t-5t)m.The velocity with which the projectile is projected is

Discussion

12954.	Q. If mass (M) and volume of earth becomes 400% and800% of their original values, then percentage changein acceleration due to gravity (g) will be:(1) 200% (2) 100%(3) –200% (4) Zero
Answer» Q. If mass (M) and volume of earth becomes 400% and 800% of their original values, then percentage change in acceleration due to gravity (g) will be: (1) 200% (2) 100% (3) –200% (4) Zero

Discussion

12955.	A sphere is suspended by a thread of length l. What minimum horizontal velocity has to be imparted the ball for it to reach the height of the suspension
Answer» A sphere is suspended by a thread of length l. What minimum horizontal velocity has to be imparted the ball for it to reach the height of the suspension

Discussion

12956.	In the circuit shown in figure, emf of the batteries are E1=3 V, E2=2 V, E3=1 V and their internal resistances are R=r1=r2=r3=1 Ω. The potential difference between the points A and B, and the current through branch containing resistor r2 will be respectively
Answer» In the circuit shown in figure, emf of the batteries are $E_{1} = 3 V, E_{2} = 2 V, E_{3} = 1 V$ and their internal resistances are $R = r_{1} = r_{2} = r_{3} = 1 Ω$ . The potential difference between the points $A$ and $B$ , and the current through branch containing resistor $r_{2}$ will be respectively

Discussion

12957.	A uniform square sheet has a side of length 2R, where R=12 cm. A circular sheet of maximum possible area is removed from one of the quadrants of the square sheet. The distance of the center of mass of the remaining portion from the center of the original sheet is:
Answer» A uniform square sheet has a side of length $2 R$ , where $R = 12 cm$ . A circular sheet of maximum possible area is removed from one of the quadrants of the square sheet. The distance of the center of mass of the remaining portion from the center of the original sheet is:

Discussion

12958.	How to prove equation of trajectory of projectile motion
Answer» How to prove equation of trajectory of projectile motion

Discussion

12959.	A current of 2A flows through a 2 ohm resistir when connected across a battery .The same battery supplies a current of 0.5A when connected across a 9ohm resistor. the internal resis†an ce of the battery is
Answer» A current of 2A flows through a 2 ohm resistir when connected across a battery .The same battery supplies a current of 0.5A when connected across a 9ohm resistor. the internal resis†an ce of the battery is

Discussion

12960.	68. Suppose 1/10 power -17 J of energy is needed by the interior of the human eye to see an object.How many photos of green light ( l is equal to 550 nm) are needed to generate this mini. amount of energy?
Answer» 68. Suppose 1/10 power -17 J of energy is needed by the interior of the human eye to see an object.How many photos of green light ( l is equal to 550 nm) are needed to generate this mini. amount of energy?

Discussion

12961.	A particular nucleus in a large population of identical radioactive nuclei did survive 5 half life of that isotope then the probability that this surviving nucleus will survive the next half life
Answer» A particular nucleus in a large population of identical radioactive nuclei did survive 5 half life of that isotope then the probability that this surviving nucleus will survive the next half life

Discussion

12962.	The average velocity of a body moving with uniform acceleration travelling a distance 3.06 m is 0.34 m/s. If the change in velocity of the body is 0.18 m/s during this time, its uniform acceleration is
Answer» The average velocity of a body moving with uniform acceleration travelling a distance $3.06 m$ is $0.34 m/s$ . If the change in velocity of the body is $0.18 m/s$ during this time, its uniform acceleration is

Discussion

12963.	An air capacitor of capacitance 10 μF is connected to a battery of 10 V. Now the space between its plates is completely filled with an insulator (K=2). The magnitude of induced charge on the dielectric is
Answer» An air capacitor of capacitance $10 μ F$ is connected to a battery of $10 V$ . Now the space between its plates is completely filled with an insulator $(K = 2)$ . The magnitude of induced charge on the dielectric is

Discussion

12964.	In an experiment to determine the focal length of a lens, the following readings were taken u=20.1+-0.2 cm, v=50.1+-0.5 cm. The percentage error in focal length is nearly___?
Answer» In an experiment to determine the focal length of a lens, the following readings were taken u=20.1+-0.2 cm, v=50.1+-0.5 cm. The percentage error in focal length is nearly___?

Discussion

12965.	Two particles execute S.H.M. of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions, and each time their displacement is half of their amplitude. The phase difference between them is
Answer» Two particles execute S.H.M. of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions, and each time their displacement is half of their amplitude. The phase difference between them is

12965.

Two particles execute S.H.M. of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions, and each time their displacement is half of their amplitude. The phase difference between them is

Answer»

Two particles execute S.H.M. of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions, and each time their displacement is half of their amplitude. The phase difference between them is

Discussion

12966.	What is the difference between d²x/dt² and dx²/dt²?
Answer» What is the difference between d²x/dt² and dx²/dt²?

Discussion

12967.	A uniform square sheet has a side of length 2R, where R=12 cm. A circular sheet of maximum possible area is removed from one of the quadrants of the square sheet. The distance of the center of mass of the remaining portion from the center of the original sheet is:
Answer» A uniform square sheet has a side of length $2 R$ , where $R = 12 cm$ . A circular sheet of maximum possible area is removed from one of the quadrants of the square sheet. The distance of the center of mass of the remaining portion from the center of the original sheet is:

Discussion

12968.	A 4-bit Modulo-6 ripple counter uses J-K flip flop. If the propagation delay of each FF is 50 ns, the maximum clock frequency that can be used is equal to ___MHz.5
Answer» A 4-bit Modulo-6 ripple counter uses J-K flip flop. If the propagation delay of each FF is 50 ns, the maximum clock frequency that can be used is equal to ___MHz. 5

Discussion

12969.	If surface area of a cube is changing at a rate of 5 m2/s , find the rate of change of body diagonal at the moment when side length is 1 m.
Answer» If surface area of a cube is changing at a rate of $5 m^{2} / s$ , find the rate of change of body diagonal at the moment when side length is $1 m$ .

Discussion

12970.	A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m s ¯¹ and in water 1486 m s¯¹.
Answer» A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m s ¯¹ and in water 1486 m s¯¹.

Discussion

12971.	A conducting rod PQ of length 5 m oriented as shown in figure is moving with velocity 2^i ms−1 without any rotation in a uniform magnetic field (3^j+4^k) T. The emf induced in the rod is
Answer» A conducting rod $PQ$ of length $5 m$ oriented as shown in figure is moving with velocity $2^i {ms}^{- 1}$ without any rotation in a uniform magnetic field $(3^j + 4^k) T .$ The emf induced in the rod is

Discussion

12972.	Identify the graph which correctly represents the variation of capacitive resistance XC with frequency.
Answer» Identify the graph which correctly represents the variation of capacitive resistance $X_{C}$ with frequency.

Discussion

12973.	The ratio of radius of gyration of a solid sphere and hollow sphere of the same mass and radius about a tangential axis is
Answer» The ratio of radius of gyration of a solid sphere and hollow sphere of the same mass and radius about a tangential axis is

Discussion

12974.	Assume that you are in a boat which moves with a speed of 13 km/hr (in still water) against the water flow. And the speed of the stream is 9 km/hr. Then what is the effective speed of your boat in this case?
Answer» Assume that you are in a boat which moves with a speed of 13 km/hr (in still water) against the water flow. And the speed of the stream is 9 km/hr. Then what is the effective speed of your boat in this case?

Discussion

12975.	A man walks at a speed of 6 km/h for 1 km and 8 km/h for next 1 km. What is his average speed for the walk of 2 km?
Answer» A man walks at a speed of $6 km/h$ for $1 km$ and $8 km/h$ for next $1 km$ . What is his average speed for the walk of $2 km$ ?

Discussion

12976.	A ball is projected from ground at an angle \pm from horizontal then what will be the kinetic energy Vs time graph?
Answer» A ball is projected from ground at an angle \pm from horizontal then what will be the kinetic energy Vs time graph?

Discussion

12977.	If the system of equations xsinα+ysinβ+zsinγ=0 xcosα+ycosβ+zcosγ=0 xcos3α+ycos3β+zcos3γ=0 has solution other than trivial solution , then which of the following is(are) possible?
Answer» If the system of equations $x s i n α + y s i n β + z s i n γ = 0$ $x c o s α + y c o s β + z c o s γ = 0$ $x c o s^{3} α + y c o s^{3} β + z c o s^{3} γ = 0$ has solution other than trivial solution , then which of the following is(are) possible?

Discussion

12978.	The length of a vertical pole at the surface of a lake of water (μ=43) is 24 cm. Then, for a fish just below the water surface, the upper tip of the pole appears to be at what distance?
Answer» The length of a vertical pole at the surface of a lake of water $(μ = \frac{4}{3})$ is $24 cm$ . Then, for a fish just below the water surface, the upper tip of the pole appears to be at what distance?

Discussion

12979.	ntA body of mass 5kg is raised vertically to a height of 10m by a force of 170N .The velocity of the body at this height will be?n
Answer» ntA body of mass 5kg is raised vertically to a height of 10m by a force of 170N .The velocity of the body at this height will be?n

Discussion

12980.	\begin{array}{lc}Two bodies A and B of mass 5kg and 10 kg are in contact with each other rest on a table against & a rigid wall. the coefficient of friction between the bodies and the table is0.2.when theforce of200N.& is applied, how to calculate normal reaction b/w wall and blacks, between 2 blocks will not weight of blocks contribute to that normal reaction ?(bodies against rigid wall)
Answer» \begin{array}{lc}Two bodies A and B of mass 5kg and 10 kg are in contact with each other rest on a table against & a rigid wall. the coefficient of friction between the bodies and the table is0.2.when theforce of200N.& is applied, how to calculate normal reaction b/w wall and blacks, between 2 blocks will not weight of blocks contribute to that normal reaction ?(bodies against rigid wall)

Discussion

12981.	Two bodies A and B are thrown simultaneously. A is projected vertically upwards with 80 m/s speed from the ground and B is projected vertically downwards from a height of 160 m with 40 m/s and along the same line of motion. The time taken for the two bodies to collide is
Answer» Two bodies $A$ and $B$ are thrown simultaneously. $A$ is projected vertically upwards with $80 m/s$ speed from the ground and $B$ is projected vertically downwards from a height of $160 m$ with $40 m/s$ and along the same line of motion. The time taken for the two bodies to collide is

Discussion

12982.	state 10 uses of electromagnet.
Answer» state 10 uses of electromagnet.

Discussion

12983.	What is the distance of the centre of mass from end P of a non-uniform rod of length L, whose mass per unit length λ=Kx2L (K is a constant) and x is the distance from end P ?
Answer» What is the distance of the centre of mass from end $P$ of a non-uniform rod of length $L$ , whose mass per unit length $λ = \frac{K x^{2}}{L}$ ( $K$ is a constant) and $x$ is the distance from end $P$ ?

Discussion

12984.	In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at 45∘ to the axes of the other two. The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack is
Answer» In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at $45^{\circ}$ to the axes of the other two. The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack is

Discussion

12985.	If the lines are drawn in proportion to the charge, what is the ratio q1q2?
Answer» If the lines are drawn in proportion to the charge, what is the ratio $\frac{q_{1}}{q_{2}}$ ?

12985.

If the lines are drawn in proportion to the charge, what is the ratio q1q2?

Answer»

If the lines are drawn in proportion to the charge, what is the ratio $\frac{q_{1}}{q_{2}}$ ?

Discussion

12986.	'On reading Shelley's A Defence of Poetry, the question insistently occurs why there is no similar A Defence of Science written of equal endowment.'
Answer» 'On reading Shelley's A Defence of Poetry, the question insistently occurs why there is no similar A Defence of Science written of equal endowment.'

Discussion

12987.	N moles of diatomic gas in a cylindrical vessel is at a temperature T.Heat is supplied to the gas such that temperature remains constant but N moles of diatomic gas is converted to monoatomic gas.What is the change in total kinetic energy of the gas. 1)0. 2)3/2 NRT. 3)1/2 NRT
Answer» N moles of diatomic gas in a cylindrical vessel is at a temperature T.Heat is supplied to the gas such that temperature remains constant but N moles of diatomic gas is converted to monoatomic gas.What is the change in total kinetic energy of the gas. 1)0. 2)3/2 NRT. 3)1/2 NRT

Discussion

12988.	The resistance of a conductor at 15∘C is 16 Ω and at 100∘C is 20 Ω. What will be the temperature coefficient of resistance of the conductor?
Answer» The resistance of a conductor at $15^{\circ} C$ is $16 Ω$ and at $100^{\circ} C$ is $20 Ω$ . What will be the temperature coefficient of resistance of the conductor?

Discussion

12989.	A body of mass 10 kg lies on a rough inclined plane of inclination θ=sin−1 35 with the horizontal. When a force of 30 N is applied on the block parallel to and upward the plane, the total reaction by the plane on the block is nearly along (take g=10 ms−2)
Answer» A body of mass $10 kg$ lies on a rough inclined plane of inclination $θ = {sin}^{- 1} \frac{3}{5}$ with the horizontal. When a force of $30 N$ is applied on the block parallel to and upward the plane, the total reaction by the plane on the block is nearly along (take $g = 10 m s^{- 2}$ )

Discussion

12990.	The function of time representing a simple harmonic motion with a period of πω is :
Answer» The function of time representing a simple harmonic motion with a period of $\frac{π}{ω}$ is :

Discussion

12991.	The figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current at an instant is equal to 0.15 A. The displacement current at that instant is -
Answer» The figure shows a capacitor made of two circular plates each of radius $12 cm$ , and separated by $5.0 cm$ . The capacitor is being charged by an external source (not shown in the figure). The charging current at an instant is equal to $0.15 A$ . The displacement current at that instant is -

Discussion

12992.	An isolated conductor of any shape has a net charge of +10micro coulomb. Inside the conductor is a cavity within which is a point charge of +3micro coulomb. What is the charge on the cavity wall? On the outer surface of the conductor.
Answer» An isolated conductor of any shape has a net charge of +10micro coulomb. Inside the conductor is a cavity within which is a point charge of +3micro coulomb. What is the charge on the cavity wall? On the outer surface of the conductor.

Discussion

12993.	Light of wavelength 1824 ∘A, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 ∘A is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is
Answer» Light of wavelength $1824 \circ A$ , incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength $1216 \circ A$ is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is

Discussion

12994.	Height of mercury in a barometer is 760 mm at any location. If mercury is replaced by water then height of water will be :
Answer» Height of mercury in a barometer is $760 mm$ at any location. If mercury is replaced by water then height of water will be :

Discussion

12995.	A fish looking up through water sees the outside world contained in a circular horizon. If the fish is 12 cm below the surface of water (μ=4/3), the radius of circle will be
Answer» A fish looking up through water sees the outside world contained in a circular horizon. If the fish is $12 cm$ below the surface of water $(μ = 4 / 3)$ , the radius of circle will be

Discussion

12996.	2 point charge having mass m and 2m having same charge q are released under the effect of mutual interaction . The F1 and F2 are forces on these charges. a1 and a2 are acceleration. Then 1)F1=F2 2)F1=-F2/2 3)a1=-a2/2 4)a1=-2a2 . Which option is correct?
Answer» 2 point charge having mass m and 2m having same charge q are released under the effect of mutual interaction . The F1 and F2 are forces on these charges. a1 and a2 are acceleration. Then 1)F1=F2 2)F1=-F2/2 3)a1=-a2/2 4)a1=-2a2 . Which option is correct?

Discussion

12997.	A Carnot engine absorbs an amount Q of heat from a reservoir at an absolute temperature T and rejects heat to a sink at a temperature of T3. The amount of heat rejected is
Answer» A Carnot engine absorbs an amount Q of heat from a reservoir at an absolute temperature T and rejects heat to a sink at a temperature of $\frac{T}{3}$ . The amount of heat rejected is

Discussion

12998.	A capacitvie transducer consists of two parallel plates of diameter 2 cm each separated by an air gap of 0.25 mm and has nominal capacitance of 150 pF. The displacement sensitivity of the transducer is _____ pF/mm-600
Answer» A capacitvie transducer consists of two parallel plates of diameter $2 c m$ each separated by an air gap of $0.25$ mm and has nominal capacitance of $150 p F$ . The displacement sensitivity of the transducer is _____ $p F / m m$ -600

Discussion

12999.	what is specific resistivity??
Answer» what is specific resistivity??

Discussion

13000.	Who among the following gave first the experimental value of G
Answer» Who among the following gave first the experimental value of G

Discussion

Explore topic-wise InterviewSolutions in .

What double titration ? Explain in brief.

A bird is flying 3 m above the surface of water of refractive index 4/3 If the bird is diving vertically down with speed 6 m/s, his apparent velocity as seen by a stationary fish underwater (in m/s) is:

The height y and distance x along the horizontal plane of a projectile on a certain planet are given by x =6t m and y=(8t-5t)m.The velocity with which the projectile is projected is

Q. If mass (M) and volume of earth becomes 400% and800% of their original values, then percentage changein acceleration due to gravity (g) will be:(1) 200% (2) 100%(3) –200% (4) Zero

A sphere is suspended by a thread of length l. What minimum horizontal velocity has to be imparted the ball for it to reach the height of the suspension

In the circuit shown in figure, emf of the batteries are E1=3 V, E2=2 V, E3=1 V and their internal resistances are R=r1=r2=r3=1 Ω. The potential difference between the points A and B, and the current through branch containing resistor r2 will be respectively

A uniform square sheet has a side of length 2R, where R=12 cm. A circular sheet of maximum possible area is removed from one of the quadrants of the square sheet. The distance of the center of mass of the remaining portion from the center of the original sheet is:

How to prove equation of trajectory of projectile motion

A current of 2A flows through a 2 ohm resistir when connected across a battery .The same battery supplies a current of 0.5A when connected across a 9ohm resistor. the internal resis†an ce of the battery is

68. Suppose 1/10 power -17 J of energy is needed by the interior of the human eye to see an object.How many photos of green light ( l is equal to 550 nm) are needed to generate this mini. amount of energy?

A particular nucleus in a large population of identical radioactive nuclei did survive 5 half life of that isotope then the probability that this surviving nucleus will survive the next half life

The average velocity of a body moving with uniform acceleration travelling a distance 3.06 m is 0.34 m/s. If the change in velocity of the body is 0.18 m/s during this time, its uniform acceleration is

An air capacitor of capacitance 10 μF is connected to a battery of 10 V. Now the space between its plates is completely filled with an insulator (K=2). The magnitude of induced charge on the dielectric is

In an experiment to determine the focal length of a lens, the following readings were taken u=20.1+-0.2 cm, v=50.1+-0.5 cm. The percentage error in focal length is nearly___?

Two particles execute S.H.M. of same amplitude and frequency along the same straight line. They pass one another when going in opposite directions, and each time their displacement is half of their amplitude. The phase difference between them is

What is the difference between d²x/dt² and dx²/dt²?

A uniform square sheet has a side of length 2R, where R=12 cm. A circular sheet of maximum possible area is removed from one of the quadrants of the square sheet. The distance of the center of mass of the remaining portion from the center of the original sheet is:

A 4-bit Modulo-6 ripple counter uses J-K flip flop. If the propagation delay of each FF is 50 ns, the maximum clock frequency that can be used is equal to ___MHz.5

If surface area of a cube is changing at a rate of 5 m2/s , find the rate of change of body diagonal at the moment when side length is 1 m.

A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m s ¯¹ and in water 1486 m s¯¹.

A conducting rod PQ of length 5 m oriented as shown in figure is moving with velocity 2^i ms−1 without any rotation in a uniform magnetic field (3^j+4^k) T. The emf induced in the rod is

Identify the graph which correctly represents the variation of capacitive resistance XC with frequency.

The ratio of radius of gyration of a solid sphere and hollow sphere of the same mass and radius about a tangential axis is

Assume that you are in a boat which moves with a speed of 13 km/hr (in still water) against the water flow. And the speed of the stream is 9 km/hr. Then what is the effective speed of your boat in this case?

A man walks at a speed of 6 km/h for 1 km and 8 km/h for next 1 km. What is his average speed for the walk of 2 km?

A ball is projected from ground at an angle \pm from horizontal then what will be the kinetic energy Vs time graph?

If the system of equations xsinα+ysinβ+zsinγ=0 xcosα+ycosβ+zcosγ=0 xcos3α+ycos3β+zcos3γ=0 has solution other than trivial solution , then which of the following is(are) possible?

The length of a vertical pole at the surface of a lake of water (μ=43) is 24 cm. Then, for a fish just below the water surface, the upper tip of the pole appears to be at what distance?

ntA body of mass 5kg is raised vertically to a height of 10m by a force of 170N .The velocity of the body at this height will be?n

Two bodies A and B are thrown simultaneously. A is projected vertically upwards with 80 m/s speed from the ground and B is projected vertically downwards from a height of 160 m with 40 m/s and along the same line of motion. The time taken for the two bodies to collide is

state 10 uses of electromagnet.

What is the distance of the centre of mass from end P of a non-uniform rod of length L, whose mass per unit length λ=Kx2L (K is a constant) and x is the distance from end P ?

In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at 45∘ to the axes of the other two. The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack is

If the lines are drawn in proportion to the charge, what is the ratio q1q2?

'On reading Shelley's A Defence of Poetry, the question insistently occurs why there is no similar A Defence of Science written of equal endowment.'

N moles of diatomic gas in a cylindrical vessel is at a temperature T.Heat is supplied to the gas such that temperature remains constant but N moles of diatomic gas is converted to monoatomic gas.What is the change in total kinetic energy of the gas. 1)0. 2)3/2 NRT. 3)1/2 NRT

The resistance of a conductor at 15∘C is 16 Ω and at 100∘C is 20 Ω. What will be the temperature coefficient of resistance of the conductor?

A body of mass 10 kg lies on a rough inclined plane of inclination θ=sin−1 35 with the horizontal. When a force of 30 N is applied on the block parallel to and upward the plane, the total reaction by the plane on the block is nearly along (take g=10 ms−2)

The function of time representing a simple harmonic motion with a period of πω is :

The figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current at an instant is equal to 0.15 A. The displacement current at that instant is -

An isolated conductor of any shape has a net charge of +10micro coulomb. Inside the conductor is a cavity within which is a point charge of +3micro coulomb. What is the charge on the cavity wall? On the outer surface of the conductor.

Light of wavelength 1824 ∘A, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV. When light of wavelength 1216 ∘A is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is

Height of mercury in a barometer is 760 mm at any location. If mercury is replaced by water then height of water will be :

A fish looking up through water sees the outside world contained in a circular horizon. If the fish is 12 cm below the surface of water (μ=4/3), the radius of circle will be

2 point charge having mass m and 2m having same charge q are released under the effect of mutual interaction . The F1 and F2 are forces on these charges. a1 and a2 are acceleration. Then 1)F1=F2 2)F1=-F2/2 3)a1=-a2/2 4)a1=-2a2 . Which option is correct?

A Carnot engine absorbs an amount Q of heat from a reservoir at an absolute temperature T and rejects heat to a sink at a temperature of T3. The amount of heat rejected is

A capacitvie transducer consists of two parallel plates of diameter 2 cm each separated by an air gap of 0.25 mm and has nominal capacitance of 150 pF. The displacement sensitivity of the transducer is _____ pF/mm-600

what is specific resistivity??

Who among the following gave first the experimental value of G