50278 + Interview Questions in Physics Page 303 InterviewSolution

15101.	For this lens;
Answer» For this lens;

Discussion

15102.	The translational kinetic energy of an ideal gas depends only on its:
Answer» The translational kinetic energy of an ideal gas depends only on its:

Discussion

15103.	(3) 128It is given that the specific heat of copper is onetenth that of water A copper ball of 100 g at 200^° Cis put into 100 cc water at 24^° C. Assuming noheat loss to the surroundings. The final(4) 138^° temperature of the system is7(2) 55^° C(1) 60%C(4) 35^° C3)40^° C
Answer» (3) 128It is given that the specific heat of copper is onetenth that of water A copper ball of 100 g at 200^° Cis put into 100 cc water at 24^° C. Assuming noheat loss to the surroundings. The final(4) 138^° temperature of the system is7(2) 55^° C(1) 60%C(4) 35^° C3)40^° C

Discussion

15104.	A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2 V and a negligible internal resistance. The potentiometer wire is 4 m long. When the resistance R=9.5 Ω is connected across a secondary cell the balancing length on the potentiometer wire was found to be 2.85 m. If the balancing length for the emf of the secondary cell is 3 m, the value of internal resistance of the cell is
Answer» A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of $2 V$ and a negligible internal resistance. The potentiometer wire is $4 m$ long. When the resistance $R = 9.5 Ω$ is connected across a secondary cell the balancing length on the potentiometer wire was found to be $2.85 m$ . If the balancing length for the emf of the secondary cell is $3 m$ , the value of internal resistance of the cell is

Discussion

15105.	Is this statement true?As the refractive index increases the object appears to be more enlarged when the object is placed in any medium
Answer» Is this statement true? As the refractive index increases the object appears to be more enlarged when the object is placed in any medium

Discussion

15106.	Find the rms value of the Sawtooth voltage of peak value V0 per cycle, for which the time function is shown in figure.
Answer» Find the $r m s$ value of the Sawtooth voltage of peak value $V_{0}$ per cycle, for which the time function is shown in figure.

Discussion

15107.	Ravi apply a force of 10 Newton and moved box of 30cm in the direction of force how much the distance travelled by an object or a displacement in circular direction and also find how much was the force or work done by Ravi [take g=10 metre per second square ]
Answer» Ravi apply a force of 10 Newton and moved box of 30cm in the direction of force how much the distance travelled by an object or a displacement in circular direction and also find how much was the force or work done by Ravi [take g=10 metre per second square ]

Discussion

15108.	Consider a binary symmetric channel (BSC) with a crossover probability of 0.20. If two such BSCs are cascaded, then the crossover probability of the resultant BSC will be _____0.32
Answer» Consider a binary symmetric channel (BSC) with a crossover probability of 0.20. If two such BSCs are cascaded, then the crossover probability of the resultant BSC will be _____ 0.32

Discussion

15109.	Given →a=^i+^j−^k,→b=−^i+2^j+^k,→c=−^i+2^j−^k. A unit vector perpendicular to both →a+→b and →b+→c is :
Answer» Given $\to a =^i +^j -^k, \to b = -^i + 2^j +^k, \to c = -^i + 2^j -^k .$ A unit vector perpendicular to both $\to a + \to b$ and $\to b + \to c$ is :

Discussion

15110.	a particle moves in a straight line with a constant acceleration it change its velocity from 10m/s to20m/s while passing through a distance 135m in ts
Answer» a particle moves in a straight line with a constant acceleration it change its velocity from 10m/s to20m/s while passing through a distance 135m in ts

Discussion

15111.	A quantity f is given by f=√hc5G where c is the speed of light, G is the gravitational constant and h is the Planck's constant. The dimension of f is the same as that of:
Answer» A quantity $f$ is given by $f = \sqrt{\frac{h c^{5}}{G}}$ where $c$ is the speed of light, $G$ is the gravitational constant and $h$ is the Planck's constant. The dimension of $f$ is the same as that of:

Discussion

15112.	What is the difference between adiabatic and cyclic process? What are the values of entropy and enthalpy in each of the process?
Answer» What is the difference between adiabatic and cyclic process? What are the values of entropy and enthalpy in each of the process?

Discussion

15113.	Derive an expression for energy consideration
Answer» Derive an expression for energy consideration

Discussion

15114.	What is the meaning of charge separation in phenol
Answer» What is the meaning of charge separation in phenol

Discussion

15115.	Choose the correct alternative: (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy. (b) The energy required to launch an orbiting satellite out of earth’s gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth’s influence.
Answer» Choose the correct alternative: (a) If the zero of potential energy is at infinity, the total energy of an orbiting satellite is negative of its kinetic/potential energy. (b) The energy required to launch an orbiting satellite out of earth’s gravitational influence is more/less than the energy required to project a stationary object at the same height (as the satellite) out of earth’s influence.

Discussion

15116.	A balloon going upwards with a velocity of 12ms ,is at a height of 65m from the earth at any instant .exactly at this instant a packet drops from it .how much time will the packet take in reaching the earth?(g=10ms2)
Answer» A balloon going upwards with a velocity of 12ms ,is at a height of 65m from the earth at any instant .exactly at this instant a packet drops from it .how much time will the packet take in reaching the earth?(g=10ms2)

Discussion

15117.	A MOSFET is operated in saturation region and channel length modulation is present. Then the drain to source conductane gds in terms of channel modulation parameter (λ) is
Answer» A MOSFET is operated in saturation region and channel length modulation is present. Then the drain to source conductane $g_{d s}$ in terms of channel modulation parameter $(λ)$ is

Discussion

15118.	The electron beam in a colour TV is accelerated through 32 kV and then strikes the screen. What is the wavelength of the most energetic X-ray photon? (hc=1242 eV-nm)
Answer» The electron beam in a colour TV is accelerated through $32 kV$ and then strikes the screen. What is the wavelength of the most energetic X-ray photon? $(h c = 1242 eV-nm)$

Discussion

15119.	Why can't Gauss law be used to calculate the field distribution around an electric dipole?
Answer» Why can't Gauss law be used to calculate the field distribution around an electric dipole?

Discussion

15120.	A point charge is moving along a straight line with a constant velocity v. Consider a small area A perpendicular to the direction of motion of the charge. Calculate the displacement current through the area when its distance from the charge is x. The value of x is too large so that the electric field at any instant is essentially given by Coulomb's law.
Answer» A point charge is moving along a straight line with a constant velocity $v$ . Consider a small area $A$ perpendicular to the direction of motion of the charge. Calculate the displacement current through the area when its distance from the charge is $x$ . The value of $x$ is too large so that the electric field at any instant is essentially given by Coulomb's law.

Discussion

15121.	12.The voltage gain of the following amplifier is A)10 B)100 C)1000 D)9.9
Answer» 12.The voltage gain of the following amplifier is A)10 B)100 C)1000 D)9.9

Discussion

15122.	what is matter waves and model?
Answer» what is matter waves and model?

Discussion

15123.	Out of a radioactive sample 90% is found after one day. What percent of the original sample can be found after 2 days ?
Answer» Out of a radioactive sample 90% is found after one day. What percent of the original sample can be found after 2 days ?

Discussion

15124.	If kinetic energy of electron is 2.5 into 10 to the power minus 24 June then calculate its de Broglie wavelength .
Answer» If kinetic energy of electron is 2.5 into 10 to the power minus 24 June then calculate its de Broglie wavelength .

Discussion

15125.	A Parachutist with total weight 75kg drops vertically onto a Sandy ground with speed of 2m/s and comes to a halt over a distance of 0.25m. The average force from the ground on her is?
Answer» A Parachutist with total weight 75kg drops vertically onto a Sandy ground with speed of 2m/s and comes to a halt over a distance of 0.25m. The average force from the ground on her is?

Discussion

15126.	A ray of light is incident on one face of a rectangular glass slab of thickness 0.1 m and refractive index 1.5 at an angle of 60∘ with the normal. Calculate the lateral shift produced. (Given sin35.3∘=0.5773, cos35.3∘=0.816, sin24.7∘=0.148)
Answer» A ray of light is incident on one face of a rectangular glass slab of thickness $0.1 m$ and refractive index $1.5$ at an angle of $60^{\circ}$ with the normal. Calculate the lateral shift produced. (Given $sin {35.3}^{\circ} = 0.5773, cos {35.3}^{\circ} = 0.816, sin {24.7}^{\circ} = 0.148)$

Discussion

15127.	a girl of mass 40 kg jumps with a horizontal velocity of 5 m/s on to a cart which is moving with a velocity of 4m/s. the mass of cart is 3 kg. what is the girl velocity when she is on the cart?
Answer» a girl of mass 40 kg jumps with a horizontal velocity of 5 m/s on to a cart which is moving with a velocity of 4m/s. the mass of cart is 3 kg. what is the girl velocity when she is on the cart?

Discussion

15128.	Two parallel wires carrying same current I experiences a force F. The graph which gives a straight line is
Answer» Two parallel wires carrying same current I experiences a force F. The graph which gives a straight line is

Discussion

15129.	A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 m/s. It collides with a horizontal spring of force constant 200 N/m. The maximum compression produced in the spring will be
Answer» A solid cylinder of mass $3 kg$ is rolling on a horizontal surface with velocity $4 m/s$ . It collides with a horizontal spring of force constant $200 N/m$ . The maximum compression produced in the spring will be

Discussion

15130.	If all the angles of an octagon are equal, find the measure of each angle.
Answer» If all the angles of an octagon are equal, find the measure of each angle.

Discussion

15131.	34. A man running at speed 5km/ hr finds the rain hitting his head vertically but he has to hold umbrella at 30 degree while at rest. The speed of rain is
Answer» 34. A man running at speed 5km/ hr finds the rain hitting his head vertically but he has to hold umbrella at 30 degree while at rest. The speed of rain is

Discussion

15132.	More than One Answer Typeएक से अधिक उत्तर प्रकार के प्रश्नIf sec2θ1 + sec2θ2 + sec2θ3 = 154 and cosec2θ1 + cosec2θ2 + cosec2θ3 = 15, then [(tanθ1 – cotθ1)2 + (tanθ2 – cotθ2)2 + (tanθ3 – cotθ3)2] is equal toयदि sec2θ1 + sec2θ2 + sec2θ3 = 154 तथा cosec2θ1 + cosec2θ2 + cosec2θ3 = 15, तब [(tanθ1 – cotθ1)2 + (tanθ2 – cotθ2)2 + (tanθ3 – cotθ3)2] का मान बराबर है
Answer» More than One Answer Type एक से अधिक उत्तर प्रकार के प्रश्न If sec²θ₁ + sec²θ₂ + sec²θ₃ = $\frac{15}{4}$ and cosec²θ₁ + cosec²θ₂ + cosec²θ₃ = 15, then [(tanθ₁ – cotθ₁)² + (tanθ₂ – cotθ₂)² + (tanθ₃ – cotθ₃)²] is equal to यदि sec²θ₁ + sec²θ₂ + sec²θ₃ = $\frac{15}{4}$ तथा cosec²θ₁ + cosec²θ₂ + cosec²θ₃ = 15, तब [(tanθ₁ – cotθ₁)² + (tanθ₂ – cotθ₂)² + (tanθ₃ – cotθ₃)²] का मान बराबर है

Discussion

15133.	A graph of pressure versus volume for an ideal gas for isochoric, isobaric, isothermal and adiabatic processes is given. Which one is for the adiabatic process?
Answer» A graph of pressure versus volume for an ideal gas for isochoric, isobaric, isothermal and adiabatic processes is given. Which one is for the adiabatic process?

Discussion

15134.	With what minimum speed a particle be projected from the origin so that it is able to pass through a given point (30m, 40m)?
Answer» With what minimum speed a particle be projected from the origin so that it is able to pass through a given point (30m, 40m)?

Discussion

15135.	As the position of an object (u) reflected from a concave mirror is varied, the position of the image (v) also varies. By letting the u changes from 0 to the graph between v versus u will be
Answer» As the position of an object (u) reflected from a concave mirror is varied, the position of the image (v) also varies. By letting the u changes from 0 to the graph between v versus u will be

Discussion

15136.	When two sound waves with a phase difference of π2, and each having amplitude A and frequency ω, are superimposed on each other, then the amplitude and frequency of resultant wave is
Answer» When two sound waves with a phase difference of $\frac{π}{2},$ and each having amplitude A and frequency $ω$ , are superimposed on each other, then the amplitude and frequency of resultant wave is

Discussion

15137.	An electric dipole is placed at an angle 30∘ with an electric field intensity 2×105NC−1. It experiences a torque equal to 4Nm. The charge on the dipole(in mC), if the dipole length is 2 cm, is
Answer» An electric dipole is placed at an angle $30^{\circ}$ with an electric field intensity $2 \times 10^{5} N C^{- 1}$ . It experiences a torque equal to $4 N m$ . The charge on the dipole(in $m C$ ), if the dipole length is $2 c m$ , is

Discussion

15138.	Lightof frequency 7.21 × 1014Hz is incident on a metal surface. Electrons with a maximum speed of6.0 × 105m/s are ejected from the surface. What is the threshold frequency forphotoemission of electrons?
Answer» Light of frequency 7.21 × 10¹⁴ Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 × 10⁵ m/s are ejected from the surface. What is the threshold frequency for photoemission of electrons?

Discussion

15139.	Two similar balls are thrown upwards along the same vertical straight line at an interval of 2 seconds with same initial speed of 40 m/s.They collide at a height of (take g =10m/s2)
Answer» Two similar balls are thrown upwards along the same vertical straight line at an interval of 2 seconds with same initial speed of 40 m/s.They collide at a height of (take g =10m/s2)

Discussion

15140.	Why is impedance least at resonant frequency ?
Answer» Why is impedance least at resonant frequency ?

Discussion

15141.	A steel plate of face area 4cm−2 and thickness 0.5 cm is fixed rigidly at the lower surface. A tangential force of 10 N is a pplied on the upper surface. Find the lateral displacement of the upper surface with respect to the lower surface. Rigidity modulus of steel. (8.4×1010Nm−1)
Answer» A steel plate of face area ${4 c m}^{- 2}$ and thickness 0.5 cm is fixed rigidly at the lower surface. A tangential force of 10 N is a pplied on the upper surface. Find the lateral displacement of the upper surface with respect to the lower surface. Rigidity modulus of steel. $(8.4 \times 10^{10} {N m}^{- 1})$

Discussion

15142.	A galvanometer has a resistance of 30 Ω and a current of 2 mA is needed for a full-scale deflection. What is the resistance needed to convert galvanometer into a voltmeter of 0.2 V range ?
Answer» A galvanometer has a resistance of $30 Ω$ and a current of $2 mA$ is needed for a full-scale deflection. What is the resistance needed to convert galvanometer into a voltmeter of $0.2 V$ range ?

Discussion

15143.	How does the energy stored in a charged capacitor change if the battery is disconnected and the plates of the capacitor are moved farther apart ?
Answer» How does the energy stored in a charged capacitor change if the battery is disconnected and the plates of the capacitor are moved farther apart ?

Discussion

15144.	Show that the force on each plate of a parallel plate capacitor has amagnitude equal to (½) QE, where Q is the charge on the capacitor,and E is the magnitude of electric field between the plates. Explainthe origin of the factor ½.
Answer» Show that the force on each plate of a parallel plate capacitor has amagnitude equal to (½) QE, where Q is the charge on the capacitor,and E is the magnitude of electric field between the plates. Explainthe origin of the factor ½.

Discussion

15145.	a wire of length l, area of cross-section A and mass m is hanging from fixed support. determine the change in length of wire due to its weight
Answer» a wire of length l, area of cross-section A and mass m is hanging from fixed support. determine the change in length of wire due to its weight

Discussion

15146.	41. In an adsorption experiment, a graph of log x/m versus log P was found to be linear with a slope of 45^° and the intercept of 0.3010. The amount of gas adsorbed per gram of charcoal under a pressure of 0.8bar is
Answer» 41. In an adsorption experiment, a graph of log x/m versus log P was found to be linear with a slope of 45^° and the intercept of 0.3010. The amount of gas adsorbed per gram of charcoal under a pressure of 0.8bar is

Discussion

15147.	The bulk modulus of a spherical object is B. If it is subjected to uniform pressure P, the fractional decrease in radius is
Answer» The bulk modulus of a spherical object is $B$ . If it is subjected to uniform pressure $P$ , the fractional decrease in radius is

Discussion

15148.	In same pressure and temperature the volume of 1gram-molecule any gas is equal. How to prove that.
Answer» In same pressure and temperature the volume of 1gram-molecule any gas is equal. How to prove that.

Discussion

15149.	The only force acting on a 2.0 kg body as it moves along the x - axis varies as shown in the figure. The velocity of the body at x = 0 is 4.0 ms What is the maximum K.E attained by the body between x=0 and x=5 m?
Answer» The only force acting on a 2.0 kg body as it moves along the x - axis varies as shown in the figure. The velocity of the body at x = 0 is 4.0 $\frac{m}{s}$ What is the maximum K.E attained by the body between x=0 and x=5 m?

15149.

The only force acting on a 2.0 kg body as it moves along the x - axis varies as shown in the figure. The velocity of the body at x = 0 is 4.0 ms What is the maximum K.E attained by the body between x=0 and x=5 m?

Answer»

The only force acting on a 2.0 kg body as it moves along the x - axis varies as shown in the figure. The velocity of the body at x = 0 is 4.0 $\frac{m}{s}$ What is the maximum K.E attained by the body between x=0 and x=5 m?

Discussion

15150.	50 m of saturated vapour is cooled down from 300 C to 200 C. Find the mass of the water condensed. The absolute humidity of saturated water vapour is 30 gm−3 a at 300C and 16 gm−3 at 200 C.
Answer» 50 m of saturated vapour is cooled down from $30^{0}$ C to $20^{0}$ C. Find the mass of the water condensed. The absolute humidity of saturated water vapour is 30 $g m^{- 3}$ a at $30^{0}$ C and 16 $g m^{- 3}$ at $20^{0}$ C.

Discussion

Explore topic-wise InterviewSolutions in .

For this lens;

The translational kinetic energy of an ideal gas depends only on its:

(3) 128It is given that the specific heat of copper is onetenth that of water A copper ball of 100 g at 200^° Cis put into 100 cc water at 24^° C. Assuming noheat loss to the surroundings. The final(4) 138^° temperature of the system is7(2) 55^° C(1) 60%C(4) 35^° C3)40^° C

Is this statement true?As the refractive index increases the object appears to be more enlarged when the object is placed in any medium

Find the rms value of the Sawtooth voltage of peak value V0 per cycle, for which the time function is shown in figure.

Ravi apply a force of 10 Newton and moved box of 30cm in the direction of force how much the distance travelled by an object or a displacement in circular direction and also find how much was the force or work done by Ravi [take g=10 metre per second square ]

Consider a binary symmetric channel (BSC) with a crossover probability of 0.20. If two such BSCs are cascaded, then the crossover probability of the resultant BSC will be _____0.32

Given →a=^i+^j−^k,→b=−^i+2^j+^k,→c=−^i+2^j−^k. A unit vector perpendicular to both →a+→b and →b+→c is :

a particle moves in a straight line with a constant acceleration it change its velocity from 10m/s to20m/s while passing through a distance 135m in ts

A quantity f is given by f=√hc5G where c is the speed of light, G is the gravitational constant and h is the Planck's constant. The dimension of f is the same as that of:

What is the difference between adiabatic and cyclic process? What are the values of entropy and enthalpy in each of the process?

Derive an expression for energy consideration

What is the meaning of charge separation in phenol

A balloon going upwards with a velocity of 12ms ,is at a height of 65m from the earth at any instant .exactly at this instant a packet drops from it .how much time will the packet take in reaching the earth?(g=10ms2)

A MOSFET is operated in saturation region and channel length modulation is present. Then the drain to source conductane gds in terms of channel modulation parameter (λ) is

The electron beam in a colour TV is accelerated through 32 kV and then strikes the screen. What is the wavelength of the most energetic X-ray photon? (hc=1242 eV-nm)

Why can't Gauss law be used to calculate the field distribution around an electric dipole?

12.The voltage gain of the following amplifier is A)10 B)100 C)1000 D)9.9

what is matter waves and model?

Out of a radioactive sample 90% is found after one day. What percent of the original sample can be found after 2 days ?

If kinetic energy of electron is 2.5 into 10 to the power minus 24 June then calculate its de Broglie wavelength .

A Parachutist with total weight 75kg drops vertically onto a Sandy ground with speed of 2m/s and comes to a halt over a distance of 0.25m. The average force from the ground on her is?

A ray of light is incident on one face of a rectangular glass slab of thickness 0.1 m and refractive index 1.5 at an angle of 60∘ with the normal. Calculate the lateral shift produced. (Given sin35.3∘=0.5773, cos35.3∘=0.816, sin24.7∘=0.148)

a girl of mass 40 kg jumps with a horizontal velocity of 5 m/s on to a cart which is moving with a velocity of 4m/s. the mass of cart is 3 kg. what is the girl velocity when she is on the cart?

Two parallel wires carrying same current I experiences a force F. The graph which gives a straight line is

A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 m/s. It collides with a horizontal spring of force constant 200 N/m. The maximum compression produced in the spring will be

If all the angles of an octagon are equal, find the measure of each angle.

34. A man running at speed 5km/ hr finds the rain hitting his head vertically but he has to hold umbrella at 30 degree while at rest. The speed of rain is

A graph of pressure versus volume for an ideal gas for isochoric, isobaric, isothermal and adiabatic processes is given. Which one is for the adiabatic process?

With what minimum speed a particle be projected from the origin so that it is able to pass through a given point (30m, 40m)?

As the position of an object (u) reflected from a concave mirror is varied, the position of the image (v) also varies. By letting the u changes from 0 to the graph between v versus u will be

When two sound waves with a phase difference of π2, and each having amplitude A and frequency ω, are superimposed on each other, then the amplitude and frequency of resultant wave is

An electric dipole is placed at an angle 30∘ with an electric field intensity 2×105NC−1. It experiences a torque equal to 4Nm. The charge on the dipole(in mC), if the dipole length is 2 cm, is

Lightof frequency 7.21 × 1014Hz is incident on a metal surface. Electrons with a maximum speed of6.0 × 105m/s are ejected from the surface. What is the threshold frequency forphotoemission of electrons?

Two similar balls are thrown upwards along the same vertical straight line at an interval of 2 seconds with same initial speed of 40 m/s.They collide at a height of (take g =10m/s2)

Why is impedance least at resonant frequency ?

A steel plate of face area 4cm−2 and thickness 0.5 cm is fixed rigidly at the lower surface. A tangential force of 10 N is a pplied on the upper surface. Find the lateral displacement of the upper surface with respect to the lower surface. Rigidity modulus of steel. (8.4×1010Nm−1)

A galvanometer has a resistance of 30 Ω and a current of 2 mA is needed for a full-scale deflection. What is the resistance needed to convert galvanometer into a voltmeter of 0.2 V range ?

How does the energy stored in a charged capacitor change if the battery is disconnected and the plates of the capacitor are moved farther apart ?

Show that the force on each plate of a parallel plate capacitor has amagnitude equal to (½) QE, where Q is the charge on the capacitor,and E is the magnitude of electric field between the plates. Explainthe origin of the factor ½.

a wire of length l, area of cross-section A and mass m is hanging from fixed support. determine the change in length of wire due to its weight

41. In an adsorption experiment, a graph of log x/m versus log P was found to be linear with a slope of 45^° and the intercept of 0.3010. The amount of gas adsorbed per gram of charcoal under a pressure of 0.8bar is

The bulk modulus of a spherical object is B. If it is subjected to uniform pressure P, the fractional decrease in radius is

In same pressure and temperature the volume of 1gram-molecule any gas is equal. How to prove that.

The only force acting on a 2.0 kg body as it moves along the x - axis varies as shown in the figure. The velocity of the body at x = 0 is 4.0 ms What is the maximum K.E attained by the body between x=0 and x=5 m?

50 m of saturated vapour is cooled down from 300 C to 200 C. Find the mass of the water condensed. The absolute humidity of saturated water vapour is 30 gm−3 a at 300C and 16 gm−3 at 200 C.