50278 + Interview Questions in Physics Page 179 InterviewSolution

8901.	Where does logic gates ate specially used.In what type oc circuits.
Answer» Where does logic gates ate specially used.In what type oc circuits.

Discussion

8902.	22. The kinetic energy acquired by a body of mass `m' is travelling some distance s starting form rest under the action of a constant force is directly proportional to Options: m0 m m2
Answer» 22. The kinetic energy acquired by a body of mass `m' is travelling some distance s starting form rest under the action of a constant force is directly proportional to Options: m0 m m2

Discussion

8903.	an alpha particle ,initially at rest , moves through a certain distance in a uniform electric field in time t1 .a proton , also initially at rest ,takes time t2 to move though an equal distance in the same uniform electric fiield .neglecting the effect of gravity ,the ratio t1/t2 is equal to
Answer» an alpha particle ,initially at rest , moves through a certain distance in a uniform electric field in time t1 .a proton , also initially at rest ,takes time t2 to move though an equal distance in the same uniform electric fiield .neglecting the effect of gravity ,the ratio t1/t2 is equal to

Discussion

8904.	For the given diagram for what maximum value of force both block will move together?
Answer» For the given diagram for what maximum value of force both block will move together?

Discussion

8905.	The threshold frequency for a certain metal is 3.3 × 1014 Hz. If lightof frequency 8.2 × 1014 Hz is incident on the metal, predict the cut-off voltage for the photoelectric emission.
Answer» The threshold frequency for a certain metal is 3.3 × 1014 Hz. If lightof frequency 8.2 × 1014 Hz is incident on the metal, predict the cut-off voltage for the photoelectric emission.

Discussion

8906.	The velocity of an electromagnetic wave is parallel to
Answer» The velocity of an electromagnetic wave is parallel to

Discussion

8907.	Consider an elastic straight beam of length L=10π m, with square cross - section of side a = 5 mm, and Young's modulus E = 200 GPa. This straight beam was bent in such a way that the two ends meet, to form a circle for mean radius R. Assuming that Euler - Bernoulli beam theory is applicable to this bending problem, the maximum tensile bending stress developed in the bent beam is MPa100
Answer» Consider an elastic straight beam of length $L = 10 π$ m, with square cross - section of side a = 5 mm, and Young's modulus E = 200 GPa. This straight beam was bent in such a way that the two ends meet, to form a circle for mean radius R. Assuming that Euler - Bernoulli beam theory is applicable to this bending problem, the maximum tensile bending stress developed in the bent beam is MPa 100

8907.

Consider an elastic straight beam of length L=10π m, with square cross - section of side a = 5 mm, and Young's modulus E = 200 GPa. This straight beam was bent in such a way that the two ends meet, to form a circle for mean radius R. Assuming that Euler - Bernoulli beam theory is applicable to this bending problem, the maximum tensile bending stress developed in the bent beam is MPa100

Answer»

Consider an elastic straight beam of length $L = 10 π$ m, with square cross - section of side a = 5 mm, and Young's modulus E = 200 GPa. This straight beam was bent in such a way that the two ends meet, to form a circle for mean radius R. Assuming that Euler - Bernoulli beam theory is applicable to this bending problem, the maximum tensile bending stress developed in the bent beam is MPa

100

Discussion

8908.	A box P and a coil Q are connected in series with an ac source of variable frequency. The emf of the source is constant at 10 V. Box P contains a capacitance of 1 μF in series with a resistance of 32 Ω. Coil Q has a self inductance of 4.9 mH and a resistance of 68 Ω in series. The frequency is adjusted so that maximum current flows in P and Q.The impedance of P at this frequency is
Answer» A box P and a coil Q are connected in series with an ac source of variable frequency. The emf of the source is constant at $10 V$ . Box P contains a capacitance of $1 μ F$ in series with a resistance of $32 Ω$ . Coil Q has a self inductance of 4.9 mH and a resistance of $68 Ω$ in series. The frequency is adjusted so that maximum current flows in P and Q. The impedance of P at this frequency is

Discussion

8909.	{ Assuming the sun to be a spherical body of radius R at a temperature of TK, evaluate the total radiant power incident on earth, at a distance r from the sun. Take radius of earth as r}}_0.
Answer» { Assuming the sun to be a spherical body of radius R at a temperature of TK, evaluate the total radiant power incident on earth, at a distance r from the sun. Take radius of earth as r}}_0.

Discussion

8910.	36. How to calculate the limiting reagent and excess ?
Answer» 36. How to calculate the limiting reagent and excess ?

Discussion

8911.	A ball is dropped from a height h above floor. If the coefficient of restitution between the floor and the ball is 'e' , the ball, after the first rebound, will rise to a height of
Answer» A ball is dropped from a height h above floor. If the coefficient of restitution between the floor and the ball is 'e' , the ball, after the first rebound, will rise to a height of

Discussion

8912.	Figure 3.33 shows a potentiometer with a cell of 2.0 V and internalresistance 0.40 W maintaining a potential drop across the resistorwire AB. A standard cell which maintains a constant emf of 1.02 V(for very moderate currents upto a few mA) gives a balance point at67.3 cm length of the wire. To ensure very low currents drawn fromthe standard cell, a very high resistance of 600 kW is put in serieswith it, which is shorted close to the balance point. The standardcell is then replaced by a cell of unknown emf e and the balancepoint found similarly, turns out to be at 82.3 cm length of the wire. (a) What is the value e ? (b) What purpose does the high resistance of 600 kW have? (c) Is the balance point affected by this high resistance? (d) Would the method work in the above situation if the driver cellof the potentiometer had an emf of 1.0V instead of 2.0V?(e) Would the circuit work well for determining an extremely smallemf, say of the order of a few mV (such as the typical emf of athermo-couple)? If not, how will you modify the circuit?
Answer» Figure 3.33 shows a potentiometer with a cell of 2.0 V and internalresistance 0.40 W maintaining a potential drop across the resistorwire AB. A standard cell which maintains a constant emf of 1.02 V(for very moderate currents upto a few mA) gives a balance point at67.3 cm length of the wire. To ensure very low currents drawn fromthe standard cell, a very high resistance of 600 kW is put in serieswith it, which is shorted close to the balance point. The standardcell is then replaced by a cell of unknown emf e and the balancepoint found similarly, turns out to be at 82.3 cm length of the wire. (a) What is the value e ? (b) What purpose does the high resistance of 600 kW have? (c) Is the balance point affected by this high resistance? (d) Would the method work in the above situation if the driver cellof the potentiometer had an emf of 1.0V instead of 2.0V?(e) Would the circuit work well for determining an extremely smallemf, say of the order of a few mV (such as the typical emf of athermo-couple)? If not, how will you modify the circuit?

Discussion

8913.	126.The length of a magnet is very large as compared to its width and breadth The time period of its oscillation in a vibration magnetometer is 2 seconds The magnet is cut perpendicular to its length into 3 equal parts and three parts are then placed on each other with their like poles together The time period of this combination will be 1)2s 2)2/3s 3)23s 4)2/3s
Answer» 126.The length of a magnet is very large as compared to its width and breadth The time period of its oscillation in a vibration magnetometer is 2 seconds The magnet is cut perpendicular to its length into 3 equal parts and three parts are then placed on each other with their like poles together The time period of this combination will be 1)2s 2)2/3s 3)23s 4)2/3s

Discussion

8914.	ntIn YDSE, d=2mm, D=2m and wavelength=500nm. If the intensity of the two slits are I and 9I, then find the intensity at y=1/6 mmn nt(i) 7In nt(i) 4In nt(i) 10In nt(i) 16In ntn
Answer» ntIn YDSE, d=2mm, D=2m and wavelength=500nm. If the intensity of the two slits are I and 9I, then find the intensity at y=1/6 mmn nt(i) 7In nt(i) 4In nt(i) 10In nt(i) 16In ntn

Discussion

8915.	Photons with energy 5 eV are incident on a cathode C, in a photoelectric cell. The maximum energy of the emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A if the stopping potential of A relative to C is
Answer» Photons with energy $5 eV$ are incident on a cathode $C$ , in a photoelectric cell. The maximum energy of the emitted photoelectrons is $2 eV .$ When photons of energy $6 eV$ are incident on $C$ , no photoelectrons will reach the anode $A$ if the stopping potential of $A$ relative to $C$ is

Discussion

8916.	A, B, C, D are four trees, located at the vertices of a square. Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is 'n'. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and reaches C. answer is theta = sin-(4n/(1+n)squared) How to do it
Answer» A, B, C, D are four trees, located at the vertices of a square. Wind blows from A to B with uniform speed. The ratio of times of flight of a bird from A to B and from B to A is 'n'. At what angle should the bird fly from the direction of wind flow, in order that it starts from A and reaches C. answer is theta = sin-(4n/(1+n)squared) How to do it

Discussion

8917.	Two particles having mass m and having equal charge are to be placed on a rough horizontal surface with coefficient of static friction μ at a distance r. Find the minimum charges on each particle so that they remain stationary.
Answer» Two particles having mass m and having equal charge are to be placed on a rough horizontal surface with coefficient of static friction μ at a distance r. Find the minimum charges on each particle so that they remain stationary.

Discussion

8918.	A block starts moving up an inclined plane of inclination 30 ∘ with an initial velocity of v0. It comes back to its initial position with velocity v02. The value of the coefficient of kinetic friction between the block and the inclined plane is close to I1000. The nearest integer to I is .
Answer» A block starts moving up an inclined plane of inclination $30^{\circ}$ with an initial velocity of $v_{0}$ . It comes back to its initial position with velocity $\frac{v_{0}}{2}$ . The value of the coefficient of kinetic friction between the block and the inclined plane is close to $\frac{I}{1000}$ . The nearest integer to I is .

Discussion

8919.	Which one of the following is not an example of projectile?
Answer» Which one of the following is not an example of projectile?

Discussion

8920.	a wire of resistance 9 ohm is bent into a form of equilateral triangle the equivalent resistance between any two points of its vertex will be
Answer» a wire of resistance 9 ohm is bent into a form of equilateral triangle the equivalent resistance between any two points of its vertex will be

Discussion

8921.	The value of π/2∫−π/2sin2x1+2xdx is
Answer» The value of $π / 2 \int - π / 2 \frac{{sin}^{2} x}{1 + 2^{x}} d x$ is

Discussion

8922.	why -I effect of OH is more than -OR grou
Answer» why -I effect of OH is more than -OR grou

Discussion

8923.	A coil of inductance L=0.2 H and of resistance R=62.8 Ω is connected to the mains alternating voltage of frequency 50 Hz. What can be the capacitance of the capacitor connected in series with the coil if the useful power has to remain unchanged?
Answer» A coil of inductance $L = 0.2 H$ and of resistance $R = 62.8 Ω$ is connected to the mains alternating voltage of frequency $50 H z$ . What can be the capacitance of the capacitor connected in series with the coil if the useful power has to remain unchanged?

Discussion

8924.	A ball of mass m is suspended by the string of length l. Another ball of mass 2m collides horizontally with ball of mass m with a speed of u so that it completes vertical circle as depicted in the below figure. Find the initial speed of the ball of mass 2m before collision. [Consider, collision is perfectly elastic, take g=10 ms−2]
Answer» A ball of mass $m$ is suspended by the string of length $l$ . Another ball of mass $2 m$ collides horizontally with ball of mass $m$ with a speed of $u$ so that it completes vertical circle as depicted in the below figure. Find the initial speed of the ball of mass $2 m$ before collision. [Consider, collision is perfectly elastic, take $g = 10 {ms}^{- 2}$ ]

Discussion

8925.	A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of 2 m/s. At what angle α with the vertical should the wind screen be placed so that rain drops falling vertically downwards with velocity 6 m/s strike the wind screen perpendicularly?
Answer» A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of $2 m/s$ . At what angle $α$ with the vertical should the wind screen be placed so that rain drops falling vertically downwards with velocity $6 m/s$ strike the wind screen perpendicularly?

Discussion

8926.	If y=∫x0f(t)sin{K(x−t)}dt, then d2ydx2+K2y is equal to
Answer» If $y = \int_{0}^{x} f (t) sin {K (x - t)} d t$ , then $\frac{d^{2} y}{d x^{2}} + K^{2} y$ is equal to

Discussion

8927.	A point source emits sound waves of constant power with intensity inversely proportional to the square of the distance from the source. By how many decibels does the sound loudness drop, when you move from point A to B ? Distance of B from the source is two times the distance of A from the source. [Take log102=0.3 ]
Answer» A point source emits sound waves of constant power with intensity inversely proportional to the square of the distance from the source. By how many decibels does the sound loudness drop, when you move from point $A$ to $B$ ? Distance of $B$ from the source is two times the distance of $A$ from the source. [Take ${log}_{10} 2 = 0.3$ ]

Discussion

8928.	27. A bullet fired at an angle of 60^° with the vertical hits the levelled ground at a distance of 200 m.Find the distance at which the bullet will hit the ground when fired at angle of 30^° (with same speed)[Hint 6030 = 90^° ]
Answer» 27. A bullet fired at an angle of 60^° with the vertical hits the levelled ground at a distance of 200 m. Find the distance at which the bullet will hit the ground when fired at angle of 30^° (with same speed) [Hint 6030 = 90^° ]

Discussion

8929.	The compressibility of water is 4×10−5 per unit atmospheric pressure. The decrease in volume of 100 cubic centimeter of water under a pressure of 100 atmosphere will be
Answer» The compressibility of water is $4 \times 10^{- 5}$ per unit atmospheric pressure. The decrease in volume of 100 cubic centimeter of water under a pressure of 100 atmosphere will be

Discussion

8930.	We are provided with the mass of universe i.e. 1055 but the question is how do we measured that because we know that its mucn of the space so how can we measure it?
Answer» We are provided with the mass of universe i.e. 10⁵⁵ but the question is how do we measured that because we know that its mucn of the space so how can we measure it?

Discussion

8931.	The6563 Å lineemitted by hydrogen in a star is found to be red shifted by 15 Å.Estimate the speed with which the star is receding from the Earth.
Answer» The 6563 Å line emitted by hydrogen in a star is found to be red shifted by 15 Å. Estimate the speed with which the star is receding from the Earth.

Discussion

8932.	92.A monkey is sitting on a tree limb. The limb exerts a normal force of 48N and a frictional force of 20N. Find the magnitude of the total force exerted by the limb of the monkey.
Answer» 92.A monkey is sitting on a tree limb. The limb exerts a normal force of 48N and a frictional force of 20N. Find the magnitude of the total force exerted by the limb of the monkey.

Discussion

8933.	A spacecraft engine ejects mass at a rate of 30 kg/s with an exhaust velocity of 3000 m/s. What is the thrust of the engine in vaccum?
Answer» A spacecraft engine ejects mass at a rate of $30 kg/s$ with an exhaust velocity of $3000 m/s$ . What is the thrust of the engine in vaccum?

Discussion

8934.	If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are
Answer» If force $(F)$ , velocity $(V)$ and time $(T)$ are taken as fundamental units, then the dimensions of mass are

Discussion

8935.	Two particles P and Q are moving with velocities of (^i+^j) and (−^i+2^j) respectively. At time t=0, P is at origin and Q is at point with position vector (2^i+^j). The equation of the path of Q with respect to P is x+2y=c. Find the value of c
Answer» Two particles $P$ and $Q$ are moving with velocities of $(^i +^j)$ and $(-^i + 2^j)$ respectively. At time $t = 0$ , $P$ is at origin and $Q$ is at point with position vector $(2^i +^j)$ . The equation of the path of $Q$ with respect to $P$ is $x + 2 y = c$ . Find the value of $c$

Discussion

8936.	The velocity-time graph of a particle is shown below. What is the acceleration of the particle?
Answer» The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

8936.

The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

Answer»

The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

Discussion

8937.	Which one of the following graphs correctly represents relation between radius (r) of an orbit and reciprocal of velocity of electron in it as per Bohr atomic model for H atom?निम्नलिखित में से कौनसा ग्राफ H परमाणु के लिए बोहर परमाणु प्रतिरूप के अनुसार कक्षा की त्रिज्या (r) तथा इसमें इलेक्ट्रॉन के वेग के व्युत्क्रम के मध्य सम्बन्ध को सही रूप से प्रदर्शित करता है?
Answer» Which one of the following graphs correctly represents relation between radius (r) of an orbit and reciprocal of velocity of electron in it as per Bohr atomic model for H atom? निम्नलिखित में से कौनसा ग्राफ H परमाणु के लिए बोहर परमाणु प्रतिरूप के अनुसार कक्षा की त्रिज्या (r) तथा इसमें इलेक्ट्रॉन के वेग के व्युत्क्रम के मध्य सम्बन्ध को सही रूप से प्रदर्शित करता है?

Discussion

8938.	Distinguish between the terms precise and and accuracy of a measurement. In tabular format.
Answer» Distinguish between the terms precise and and accuracy of a measurement. In tabular format.

Discussion

8939.	Tap the bubbles having possible values of sinx.
Answer» Tap the bubbles having possible values of $sin x .$

Discussion

8940.	Does the value of rate constant change due to catayst
Answer» Does the value of rate constant change due to catayst

Discussion

8941.	Asmall town with a demand of 800 kW of electric power at 220 V issituated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 Ω perkm. The town gets power from the line through a 4000-220 V step-downtransformer at a sub-station in the town.(a) Estimatethe line power loss in the form of heat.(b) Howmuch power must the plant supply, assuming there is negligible powerloss due to leakage?(c) Characterisethe step up transformer at the plant.
Answer» A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5 Ω per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. (a) Estimate the line power loss in the form of heat. (b) How much power must the plant supply, assuming there is negligible power loss due to leakage? (c) Characterise the step up transformer at the plant.

8941.

Asmall town with a demand of 800 kW of electric power at 220 V issituated 15 km away from an electric plant generating power at 440 V.The resistance of the two wire line carrying power is 0.5 Ω perkm. The town gets power from the line through a 4000-220 V step-downtransformer at a sub-station in the town.(a) Estimatethe line power loss in the form of heat.(b) Howmuch power must the plant supply, assuming there is negligible powerloss due to leakage?(c) Characterisethe step up transformer at the plant.

Answer»

A
small town with a demand of 800 kW of electric power at 220 V is
situated 15 km away from an electric plant generating power at 440 V.
The resistance of the two wire line carrying power is 0.5 Ω per
km. The town gets power from the line through a 4000-220 V step-down
transformer at a sub-station in the town.

(a) Estimate
the line power loss in the form of heat.

(b) How
much power must the plant supply, assuming there is negligible power
loss due to leakage?

(c) Characterise
the step up transformer at the plant.

Discussion

8942.	A body of mass 5 kg under the action of constant force →F=Fxˆi+Fyˆj has velocity at t=0 sec as →v=(6ˆi−2ˆj) m/s and at t=10 sec as →v=+6 ˆj m/s. The force →F is
Answer» A body of mass $5 kg$ under the action of constant force $\to F = F_{x} ˆ i + F_{y} ˆ j$ has velocity at $t = 0 sec$ as $\to v = (6 ˆ i - 2 ˆ j) m/s$ and at $t = 10 sec$ as $\to v = + 6 ˆ j m/s$ . The force $\to F$ is

Discussion

8943.	7. The volume of an air bubble is doubled as it rises o from the bottom of lake to its surface. The atmospheric pressure is 75 cm of mercury. The ratio of density of mercury to that of lake water is40/3. The depth of the lake in metre is (1) 10 (2) 15 (3) 20 (4) 2
Answer» 7. The volume of an air bubble is doubled as it rises o from the bottom of lake to its surface. The atmospheric pressure is 75 cm of mercury. The ratio of density of mercury to that of lake water is40/3. The depth of the lake in metre is (1) 10 (2) 15 (3) 20 (4) 2

Discussion

8944.	The pendulum of a clock is replaced by a spring-mass system with the spring having spring constant 0.1 N m−1. What mass should be attached to the spring ?
Answer» The pendulum of a clock is replaced by a spring-mass system with the spring having spring constant $0.1 N m^{- 1.}$ What mass should be attached to the spring ?

Discussion

8945.	Ring and disc is rolling down an inclined plane which needed more weight to stop
Answer» Ring and disc is rolling down an inclined plane which needed more weight to stop

Discussion

8946.	Calculate the potential difference between points a and b in the circuit below, i.e.,\|Vab\|
Answer» Calculate the potential difference between points $a$ and $b$ in the circuit below, i.e., $\| V_{a b} \|$

Discussion

8947.	Which one of the following circuits shows correct biasing of a PNP transistor to operate in the active region in the CE-mode-
Answer» Which one of the following circuits shows correct biasing of a $PNP$ transistor to operate in the active region in the $CE$ -mode-

Discussion

8948.	If impulse I varies with time t as I=20t^2-40t.The change in momentum is minimum at -t=2s -t=1/2s -t=1s -t=3/2
Answer» If impulse I varies with time t as I=20t^2-40t.The change in momentum is minimum at -t=2s -t=1/2s -t=1s -t=3/2

Discussion

8949.	80.If in an A.C. circuit,rms value of current is 2 A and wattless current is root 3 A, then find the value of power factor
Answer» 80.If in an A.C. circuit,rms value of current is 2 A and wattless current is root 3 A, then find the value of power factor

Discussion

8950.	(a)Why are infra-red waves often called heat waves ? Explain. (b) What do you understand by the statement, "Electromagnetic waves transport momentum" ?
Answer» (a)Why are infra-red waves often called heat waves ? Explain. (b) What do you understand by the statement, "Electromagnetic waves transport momentum" ?

Discussion

Explore topic-wise InterviewSolutions in .

Where does logic gates ate specially used.In what type oc circuits.

22. The kinetic energy acquired by a body of mass `m' is travelling some distance s starting form rest under the action of a constant force is directly proportional to Options: m0 m m2

an alpha particle ,initially at rest , moves through a certain distance in a uniform electric field in time t1 .a proton , also initially at rest ,takes time t2 to move though an equal distance in the same uniform electric fiield .neglecting the effect of gravity ,the ratio t1/t2 is equal to

For the given diagram for what maximum value of force both block will move together?

The threshold frequency for a certain metal is 3.3 × 1014 Hz. If lightof frequency 8.2 × 1014 Hz is incident on the metal, predict the cut-off voltage for the photoelectric emission.

The velocity of an electromagnetic wave is parallel to

{ Assuming the sun to be a spherical body of radius R at a temperature of TK, evaluate the total radiant power incident on earth, at a distance r from the sun. Take radius of earth as r}}_0.

36. How to calculate the limiting reagent and excess ?

A ball is dropped from a height h above floor. If the coefficient of restitution between the floor and the ball is 'e' , the ball, after the first rebound, will rise to a height of

ntIn YDSE, d=2mm, D=2m and wavelength=500nm. If the intensity of the two slits are I and 9I, then find the intensity at y=1/6 mmn nt(i) 7In nt(i) 4In nt(i) 10In nt(i) 16In ntn

Photons with energy 5 eV are incident on a cathode C, in a photoelectric cell. The maximum energy of the emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A if the stopping potential of A relative to C is

Two particles having mass m and having equal charge are to be placed on a rough horizontal surface with coefficient of static friction μ at a distance r. Find the minimum charges on each particle so that they remain stationary.

A block starts moving up an inclined plane of inclination 30 ∘ with an initial velocity of v0. It comes back to its initial position with velocity v02. The value of the coefficient of kinetic friction between the block and the inclined plane is close to I1000. The nearest integer to I is .

Which one of the following is not an example of projectile?

a wire of resistance 9 ohm is bent into a form of equilateral triangle the equivalent resistance between any two points of its vertex will be

The value of π/2∫−π/2sin2x1+2xdx is

why -I effect of OH is more than -OR grou

A coil of inductance L=0.2 H and of resistance R=62.8 Ω is connected to the mains alternating voltage of frequency 50 Hz. What can be the capacitance of the capacitor connected in series with the coil if the useful power has to remain unchanged?

If y=∫x0f(t)sin{K(x−t)}dt, then d2ydx2+K2y is equal to

27. A bullet fired at an angle of 60^° with the vertical hits the levelled ground at a distance of 200 m.Find the distance at which the bullet will hit the ground when fired at angle of 30^° (with same speed)[Hint 6030 = 90^° ]

The compressibility of water is 4×10−5 per unit atmospheric pressure. The decrease in volume of 100 cubic centimeter of water under a pressure of 100 atmosphere will be

We are provided with the mass of universe i.e. 1055 but the question is how do we measured that because we know that its mucn of the space so how can we measure it?

The6563 Å lineemitted by hydrogen in a star is found to be red shifted by 15 Å.Estimate the speed with which the star is receding from the Earth.

92.A monkey is sitting on a tree limb. The limb exerts a normal force of 48N and a frictional force of 20N. Find the magnitude of the total force exerted by the limb of the monkey.

A spacecraft engine ejects mass at a rate of 30 kg/s with an exhaust velocity of 3000 m/s. What is the thrust of the engine in vaccum?

If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are

Two particles P and Q are moving with velocities of (^i+^j) and (−^i+2^j) respectively. At time t=0, P is at origin and Q is at point with position vector (2^i+^j). The equation of the path of Q with respect to P is x+2y=c. Find the value of c

The velocity-time graph of a particle is shown below. What is the acceleration of the particle?

Distinguish between the terms precise and and accuracy of a measurement. In tabular format.

Tap the bubbles having possible values of sinx.

Does the value of rate constant change due to catayst

A body of mass 5 kg under the action of constant force →F=Fxˆi+Fyˆj has velocity at t=0 sec as →v=(6ˆi−2ˆj) m/s and at t=10 sec as →v=+6 ˆj m/s. The force →F is

7. The volume of an air bubble is doubled as it rises o from the bottom of lake to its surface. The atmospheric pressure is 75 cm of mercury. The ratio of density of mercury to that of lake water is40/3. The depth of the lake in metre is (1) 10 (2) 15 (3) 20 (4) 2

The pendulum of a clock is replaced by a spring-mass system with the spring having spring constant 0.1 N m−1. What mass should be attached to the spring ?

Ring and disc is rolling down an inclined plane which needed more weight to stop

Calculate the potential difference between points a and b in the circuit below, i.e.,|Vab|

Which one of the following circuits shows correct biasing of a PNP transistor to operate in the active region in the CE-mode-

If impulse I varies with time t as I=20t^2-40t.The change in momentum is minimum at -t=2s -t=1/2s -t=1s -t=3/2

80.If in an A.C. circuit,rms value of current is 2 A and wattless current is root 3 A, then find the value of power factor

(a)Why are infra-red waves often called heat waves ? Explain. (b) What do you understand by the statement, "Electromagnetic waves transport momentum" ?