50278 + Interview Questions in Physics Page 20 InterviewSolution

951.	Write the truth table for circuit given in Fig. 14.47 below consistingof NOR gates and identify the logic operation (OR, AND, NOT) whichthis circuit is performing.(Hint: A = 0, B = 1 then A and B inputs of second NOR gate will be 0and hence Y=1. Similarly work out the values of Y for othercombinations of A and B. Compare with the truth table of OR, AND,NOT gates and find the correct one.)
Answer» Write the truth table for circuit given in Fig. 14.47 below consistingof NOR gates and identify the logic operation (OR, AND, NOT) whichthis circuit is performing.(Hint: A = 0, B = 1 then A and B inputs of second NOR gate will be 0and hence Y=1. Similarly work out the values of Y for othercombinations of A and B. Compare with the truth table of OR, AND,NOT gates and find the correct one.)

Discussion

952.	In Lacey's regime theory, the velocity of flow is proportional to
Answer» In Lacey's regime theory, the velocity of flow is proportional to

Discussion

953.	A spherical black body with a radius of 12 cm radiates 450 W power at 50 K. If the radius was halved and the temperature doubled, the power radiated in watt would be:
Answer» A spherical black body with a radius of 12 cm radiates 450 W power at 50 K. If the radius was halved and the temperature doubled, the power radiated in watt would be:

Discussion

954.	67. How many times larger is the spacing between energy levels with n=3 and n=8 spacing between the energy level with n=8 and n=9 for H atom
Answer» 67. How many times larger is the spacing between energy levels with n=3 and n=8 spacing between the energy level with n=8 and n=9 for H atom

Discussion

955.	In the figure shown, both the blocks are of equal mass of 10 kg and F=300 N. Find the value of tension T in the string in between the blocks.
Answer» In the figure shown, both the blocks are of equal mass of $10 k g$ and $F = 300 N$ . Find the value of tension $T$ in the string in between the blocks.

Discussion

956.	Why two equal and like charges cancel out in pairs?
Answer» Why two equal and like charges cancel out in pairs?

Discussion

957.	Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following figure is a possible result after collision?
Answer» Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following figure is a possible result after collision?

957.

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following figure is a possible result after collision?

Answer»

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following figure is a possible result after collision?

Discussion

958.	25. A particle is projected with a speed u at an angle θ withthe horizontal. Consider a small part of its path nearthe highest position and take it approximately to be acircular arc. What is the radius of this circle? Thisradius is called the radius of curvature of the curve atthe point.
Answer» 25. A particle is projected with a speed u at an angle θ withthe horizontal. Consider a small part of its path nearthe highest position and take it approximately to be acircular arc. What is the radius of this circle? Thisradius is called the radius of curvature of the curve atthe point.

Discussion

959.	Consider the situation shown in figure below. The width of each plate is b=3 m. The capacitor plates are rigidly clamped in the laboratory and connected to a battery of emf E=1000 V. All surfaces are frictionless. Calculate the value of M (in kg) for which the dielectric slab will stay in equilibrium.(Given: d=1 m)
Answer» Consider the situation shown in figure below. The width of each plate is $b = 3 m$ . The capacitor plates are rigidly clamped in the laboratory and connected to a battery of emf $E = 1000 V$ . All surfaces are frictionless. Calculate the value of $M$ (in $kg$ ) for which the dielectric slab will stay in equilibrium. (Given: $d = 1 m$ )

Discussion

960.	A particle is projected horizontally with a speed u from the top of a plane inclined at an angle θ with the horizontal .How far from the point of projection will the particle strike the plane
Answer» A particle is projected horizontally with a speed u from the top of a plane inclined at an angle θ with the horizontal .How far from the point of projection will the particle strike the plane

Discussion

961.	Choose the correct answer from among the given ones:The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) O.
Answer» Choose the correct answer from among the given ones: The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) O.

961.

Choose the correct answer from among the given ones:The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) O.

Answer»

Choose the correct answer from among the given ones:

The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) O.

Discussion

962.	A train starts from rest with a constant acceleration a=2 ms−2. After 5 s, a stone is dropped from the window of the train. If the window is at a height of 2 m from the ground, what is the magnitude of the velocity of the stone 0.2 s after it was dropped? Take g=10 ms−2.
Answer» A train starts from rest with a constant acceleration $a = 2 m s^{- 2}$ . After 5 s, a stone is dropped from the window of the train. If the window is at a height of 2 m from the ground, what is the magnitude of the velocity of the stone 0.2 s after it was dropped? Take $g = 10 m s^{- 2}$ .

Discussion

963.	If ϕ1 and ϕ2 be the apparent angles of dip observed in two vertical planes at right angles to each other and ϕ be the true angle of dip, then
Answer» If $ϕ_{1}$ and $ϕ_{2}$ be the apparent angles of dip observed in two vertical planes at right angles to each other and $ϕ$ be the true angle of dip, then

Discussion

964.	The distance travelled by a body falling freely from rest in 2^{nd}, 3^{rd} and 5^{th }second of its motion are inthe ratio (1) 7:5:3 (2) 3 :5 :9 (3) 5: 3:7 (4) 5: 7:3
Answer» The distance travelled by a body falling freely from rest in 2^{nd}, 3^{rd} and 5^{th }second of its motion are inthe ratio (1) 7:5:3 (2) 3 :5 :9 (3) 5: 3:7 (4) 5: 7:3

Discussion

965.	what is the reason for lusture of diamond ? Can diamond shine in darkness?(Diagram)
Answer» what is the reason for lusture of diamond ? Can diamond shine in darkness?(Diagram)

Discussion

966.	A U shaped tube of mass '2m' is placed on a smooth horizontal surface. Two identical spherical balls each of mass 'm' and of diameter slightly less than the inner diameter of tube enters into the tube with a velocity u as shown. (Assume no loss of energy anywhere and all collisions to be elastic). Speed of each spherical ball, just before their collision is
Answer» A U shaped tube of mass '2m' is placed on a smooth horizontal surface. Two identical spherical balls each of mass 'm' and of diameter slightly less than the inner diameter of tube enters into the tube with a velocity u as shown. (Assume no loss of energy anywhere and all collisions to be elastic). Speed of each spherical ball, just before their collision is

966.

A U shaped tube of mass '2m' is placed on a smooth horizontal surface. Two identical spherical balls each of mass 'm' and of diameter slightly less than the inner diameter of tube enters into the tube with a velocity u as shown. (Assume no loss of energy anywhere and all collisions to be elastic). Speed of each spherical ball, just before their collision is

Answer»

A U shaped tube of mass '2m' is placed on a smooth horizontal surface. Two identical spherical balls each of mass 'm' and of diameter slightly less than the inner diameter of tube enters into the tube with a velocity u as shown. (Assume no loss of energy anywhere and all collisions to be elastic).

Speed of each spherical ball, just before their collision is

Discussion

967.	Explain what would happen if in the capacitor given in Exercise 2.8, a 3 mm thick mica sheet (of dielectric constant = 6) were inserted between the plates, (a) while the voltage supply remained connected. (b) after the supply was disconnected.
Answer» Explain what would happen if in the capacitor given in Exercise 2.8, a 3 mm thick mica sheet (of dielectric constant = 6) were inserted between the plates, (a) while the voltage supply remained connected. (b) after the supply was disconnected.

Discussion

968.	70.Find the potential at point C and D:
Answer» 70.Find the potential at point C and D:

Discussion

969.	Four particles having masses m,2m,3m,4m are placed at four corners of a square of edge a.Find the gravitational force acting on a particle of mass m placed at the centre.
Answer» Four particles having masses m,2m,3m,4m are placed at four corners of a square of edge a.Find the gravitational force acting on a particle of mass m placed at the centre.

Discussion

970.	A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell
Answer» A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell

Discussion

971.	How to draw molecular structure of HClO?
Answer» How to draw molecular structure of HClO?

Discussion

972.	A helicopter of mass 1000 kg rises with a vertical acceleration of 15 ms−2. The crew and the passengers weigh 300 kg. Give the magnitude and direction of the a) force on the floor by the crew and passengers, b) action of the rotor of the helicopter on the surrounding air, c) force on the helicopter due to the surrounding air.
Answer» A helicopter of mass 1000 kg rises with a vertical acceleration of 15 $m s^{- 2}$ . The crew and the passengers weigh 300 kg. Give the magnitude and direction of the a) force on the floor by the crew and passengers, b) action of the rotor of the helicopter on the surrounding air, c) force on the helicopter due to the surrounding air.

Discussion

973.	Explain geometrical structure in solids
Answer» Explain geometrical structure in solids

Discussion

974.	If energy is released or absorbed in the form of photons, and if increase in intensity increases the number of photons, then how come energy remains constant when intensity is increased?
Answer» If energy is released or absorbed in the form of photons, and if increase in intensity increases the number of photons, then how come energy remains constant when intensity is increased?

Discussion

975.	A semicircular 2-dimensional plate of mass m has radius r and centre C. Its centre of mass is at a distance x from C. Its moment of inertia about an axis through its centre of mass and perpendicular to its plane is
Answer» A semicircular 2-dimensional plate of mass $m$ has radius $r$ and centre C. Its centre of mass is at a distance $x$ from C. Its moment of inertia about an axis through its centre of mass and perpendicular to its plane is

Discussion

976.	If the shown system is in equilibrium, then the surface charge density on the large sheet is[Take ϵ0=9×10−12 C2/Nm2 and g=10 m/s2]
Answer» If the shown system is in equilibrium, then the surface charge density on the large sheet is [Take $ϵ_{0} = 9 \times 10^{- 12} C^{2} {/Nm}^{2}$ and $g = 10 {m/s}^{2}$ ]

Discussion

977.	A npn transistor is connected in common emitter configuration in a given ampliﬁer. A load resistance of 800Ω is connected in the collector circuit and the voltage drop across it is 0.8V. If the current ampliﬁcation factor is 0.96 and the input resistance of the circuit is 192Ω, the voltage gain and the power gain of the amplifier will respectively be:
Answer» A npn transistor is connected in common emitter configuration in a given ampliﬁer. A load resistance of $800 Ω$ is connected in the collector circuit and the voltage drop across it is 0.8V. If the current ampliﬁcation factor is 0.96 and the input resistance of the circuit is $192 Ω$ , the voltage gain and the power gain of the amplifier will respectively be:

Discussion

978.	A body of density D1 and mass M is moving downward in glycerin of density D2. What is the viscous force acting on it when it is moving with terminal velocity?
Answer» A body of density $D_{1}$ and mass M is moving downward in glycerin of density $D_{2}$ . What is the viscous force acting on it when it is moving with terminal velocity?

Discussion

979.	Five isolated capacitors are connected as shown in the figure. Find the potential at the junction ′O′
Answer» Five isolated capacitors are connected as shown in the figure. Find the potential at the junction $^{'} O^{'}$

Discussion

980.	A smooth piston of mass m and area of cross-section A is in equilibrium with the gas in the jar, when the pressure of the gas is P0. Find the angular frequency of oscillation of the piston, assuming adiabatic change of state of the gas.
Answer» A smooth piston of mass $m$ and area of cross-section $A$ is in equilibrium with the gas in the jar, when the pressure of the gas is $P_{0}$ . Find the angular frequency of oscillation of the piston, assuming adiabatic change of state of the gas.

Discussion

981.	A car starts with 10 ms and accelerates with constant acceleration of 5ms2. Find the final speed achieved by the car after 10 sec.
Answer» A car starts with $10 \frac{m}{s}$ and accelerates with constant acceleration of $5 \frac{m}{s^{2}}$ . Find the final speed achieved by the car after $10$ sec.

Discussion

982.	Suggest a suitable physical situationfor each of the following graphs (Fig 3.22):(a) (b) (c) (Fig:3.22)
Answer» Suggest a suitable physical situation for each of the following graphs (Fig 3.22): (a) (b) (c) (Fig: 3.22)

982.

Suggest a suitable physical situationfor each of the following graphs (Fig 3.22):(a) (b) (c) (Fig:3.22)

Answer»

Suggest a suitable physical situation
for each of the following graphs (Fig 3.22):

(a)

(b)

(c)

(Fig:
3.22)

Discussion

983.	At what angle from horizontal must we keep the mirror in order to get a vertical reflected ray ?
Answer» At what angle from horizontal must we keep the mirror in order to get a vertical reflected ray ?

Discussion

984.	The relation between internal energy U, pressure P and volume V of a gas in an adiabatic process is U=a+bPV, where a and b are constants. What is the effective value of adiabatic constant γ?
Answer» The relation between internal energy $U$ , pressure $P$ and volume $V$ of a gas in an adiabatic process is $U = a + b P V$ , where $a$ and $b$ are constants. What is the effective value of adiabatic constant $γ$ ?

Discussion

985.	angular width of the first minimum on the other side of the central maximum due to a single slit of width a illuminated by a light of wavelength Lambda is
Answer» angular width of the first minimum on the other side of the central maximum due to a single slit of width a illuminated by a light of wavelength Lambda is

Discussion

986.	What area to be taken to find current density , is it any area in cross section?
Answer» What area to be taken to find current density , is it any area in cross section?

Discussion

987.	\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt5}}}}}}}}}}}}}}}}=5n value of
Answer» \sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt5}}}}}}}}}}}}}}}}=5n value of

Discussion

988.	The Laplace transform of a signal x(t) is given by , X(s)=s2+2s+1s2−s+1 if x(t)=δ(t)+2√3e0.5t(cos(√32t+θ))u(t), then θ equal to ______degrees. -30
Answer» The Laplace transform of a signal x(t) is given by , $X (s) = \frac{s^{2} + 2 s + 1}{s^{2} - s + 1}$ $i f x (t) = δ (t) + 2 \sqrt{3} e^{0.5 t} (c o s (\frac{\sqrt{3}}{2} t + θ)) u (t)$ , then $θ$ equal to ______degrees. -30

Discussion

989.	A wire of length 5 m and radius 1 mm has resistance of 1 Ω. What length of the same material at the same temperature, and of radius 2 mm will also have a resistance of 1 Ω ?
Answer» A wire of length $5 m$ and radius $1 mm$ has resistance of $1 Ω$ . What length of the same material at the same temperature, and of radius $2 mm$ will also have a resistance of $1 Ω$ ?

Discussion

990.	The separation between the objective and the eyepiece of a compound microscope can be adjusted between 9'8 cm to 11.8 cm. If the focal lengths of the objective and the eyepiece are 1.0 cm and 6 cm respectively, find the range of the magnifying power if the image is always needed at 24 cm from the eye.
Answer» The separation between the objective and the eyepiece of a compound microscope can be adjusted between 9'8 cm to 11.8 cm. If the focal lengths of the objective and the eyepiece are 1.0 cm and 6 cm respectively, find the range of the magnifying power if the image is always needed at 24 cm from the eye.

Discussion

991.	Two conducting circular loops of radii R1 and R2 are placed in the same plane, with their centers coinciding. If R1>>R2, the mutual inductance M between them will be directly proportional to -
Answer» Two conducting circular loops of radii $R_{1}$ and $R_{2}$ are placed in the same plane, with their centers coinciding. If $R_{1} >> R_{2}$ , the mutual inductance $M$ between them will be directly proportional to -

Discussion

992.	In the figure the string has a mass 4.5 g. How much time will it take for a transverse disturbance produced at the floor to reach the pulley? (Take g=10 ms−2)
Answer» In the figure the string has a mass $4.5 g$ . How much time will it take for a transverse disturbance produced at the floor to reach the pulley? (Take $g = 10 {ms}^{- 2})$

Discussion

993.	In the figure below, masses mA=2 kg and mB=4 kg. For what minimum value of F, block A starts slipping over B (g=10 m/s2)
Answer» In the figure below, masses $m_{A} = 2 k g$ and $m_{B} = 4 k g$ . For what minimum value of $F$ , block A starts slipping over B $(g = 10 m / s^{2})$

Discussion

994.	if the dis†an ce between two charges is incresed by 20% than its firce will be ?
Answer» if the dis†an ce between two charges is incresed by 20% than its firce will be ?

Discussion

995.	A current of 10 A is established in a long wire along the positive z-axis . Find the magnetic field →B at the point (1 m,0,0).
Answer» A current of 10 A is established in a long wire along the positive z-axis . Find the magnetic field $\to B$ at the point (1 m,0,0).

Discussion

996.	18. Ka of water at 25
Answer» 18. Ka of water at 25

Discussion

997.	Three particles of same mass m are attached by massless rods of same length l and placed at the vertices of an equilateral triangle. The angular momentum about an axis XX′ will be nmωl24, where n is
Answer» Three particles of same mass $m$ are attached by massless rods of same length $l$ and placed at the vertices of an equilateral triangle. The angular momentum about an axis $X X^{'}$ will be $\frac{n m ω l^{2}}{4}$ , where $n$ is

Discussion

998.	A tuning fork producing sound of frequency 380 Hz is moving towards a wall with a velocity of 4 ms−1. The number of beats per second heard by a stationary listener produced due to direct and reflected sounds will be [speed of sound in air =340 ms−1]
Answer» A tuning fork producing sound of frequency $380 Hz$ is moving towards a wall with a velocity of $4 {ms}^{- 1}$ . The number of beats per second heard by a stationary listener produced due to direct and reflected sounds will be [speed of sound in air $= 340 {ms}^{- 1}$ ]

Discussion

999.	When will a concave lens behave like a convex lens and when will a convex lens behave like a concave lens?
Answer» When will a concave lens behave like a convex lens and when will a convex lens behave like a concave lens?

Discussion

1000.	It is now believed that protons and neutrons (which constitute nucleiof ordinary matter) are themselves built out of more elementary unitscalled quarks. A proton and a neutron consist of three quarks each.Two types of quarks, the so called ‘up’ quark (denoted by u) of charge+ (2/3) e, and the ‘down’ quark (denoted by d) of charge (–1/3) e,together with electrons build up ordinary matter. (Quarks of othertypes have also been found which give rise to different unusualvarieties of matter.) Suggest a possible quark composition of aproton and neutron.
Answer» It is now believed that protons and neutrons (which constitute nucleiof ordinary matter) are themselves built out of more elementary unitscalled quarks. A proton and a neutron consist of three quarks each.Two types of quarks, the so called ‘up’ quark (denoted by u) of charge+ (2/3) e, and the ‘down’ quark (denoted by d) of charge (–1/3) e,together with electrons build up ordinary matter. (Quarks of othertypes have also been found which give rise to different unusualvarieties of matter.) Suggest a possible quark composition of aproton and neutron.

Discussion

Explore topic-wise InterviewSolutions in .

In Lacey's regime theory, the velocity of flow is proportional to

A spherical black body with a radius of 12 cm radiates 450 W power at 50 K. If the radius was halved and the temperature doubled, the power radiated in watt would be:

67. How many times larger is the spacing between energy levels with n=3 and n=8 spacing between the energy level with n=8 and n=9 for H atom

In the figure shown, both the blocks are of equal mass of 10 kg and F=300 N. Find the value of tension T in the string in between the blocks.

Why two equal and like charges cancel out in pairs?

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following figure is a possible result after collision?

25. A particle is projected with a speed u at an angle θ withthe horizontal. Consider a small part of its path nearthe highest position and take it approximately to be acircular arc. What is the radius of this circle? Thisradius is called the radius of curvature of the curve atthe point.

A particle is projected horizontally with a speed u from the top of a plane inclined at an angle θ with the horizontal .How far from the point of projection will the particle strike the plane

Choose the correct answer from among the given ones:The gravitational intensity at the centre of a hemispherical shell of uniform mass density has the direction indicated by the arrow (see Fig 8.12) (i) a, (ii) b, (iii) c, (iv) O.

A train starts from rest with a constant acceleration a=2 ms−2. After 5 s, a stone is dropped from the window of the train. If the window is at a height of 2 m from the ground, what is the magnitude of the velocity of the stone 0.2 s after it was dropped? Take g=10 ms−2.

If ϕ1 and ϕ2 be the apparent angles of dip observed in two vertical planes at right angles to each other and ϕ be the true angle of dip, then

The distance travelled by a body falling freely from rest in 2^{nd}, 3^{rd} and 5^{th }second of its motion are inthe ratio (1) 7:5:3 (2) 3 :5 :9 (3) 5: 3:7 (4) 5: 7:3

what is the reason for lusture of diamond ? Can diamond shine in darkness?(Diagram)

Explain what would happen if in the capacitor given in Exercise 2.8, a 3 mm thick mica sheet (of dielectric constant = 6) were inserted between the plates, (a) while the voltage supply remained connected. (b) after the supply was disconnected.

70.Find the potential at point C and D:

Four particles having masses m,2m,3m,4m are placed at four corners of a square of edge a.Find the gravitational force acting on a particle of mass m placed at the centre.

A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell

How to draw molecular structure of HClO?

Explain geometrical structure in solids

If energy is released or absorbed in the form of photons, and if increase in intensity increases the number of photons, then how come energy remains constant when intensity is increased?

A semicircular 2-dimensional plate of mass m has radius r and centre C. Its centre of mass is at a distance x from C. Its moment of inertia about an axis through its centre of mass and perpendicular to its plane is

If the shown system is in equilibrium, then the surface charge density on the large sheet is[Take ϵ0=9×10−12 C2/Nm2 and g=10 m/s2]

A body of density D1 and mass M is moving downward in glycerin of density D2. What is the viscous force acting on it when it is moving with terminal velocity?

Five isolated capacitors are connected as shown in the figure. Find the potential at the junction ′O′

A smooth piston of mass m and area of cross-section A is in equilibrium with the gas in the jar, when the pressure of the gas is P0. Find the angular frequency of oscillation of the piston, assuming adiabatic change of state of the gas.

A car starts with 10 ms and accelerates with constant acceleration of 5ms2. Find the final speed achieved by the car after 10 sec.

Suggest a suitable physical situationfor each of the following graphs (Fig 3.22):(a) (b) (c) (Fig:3.22)

At what angle from horizontal must we keep the mirror in order to get a vertical reflected ray ?

The relation between internal energy U, pressure P and volume V of a gas in an adiabatic process is U=a+bPV, where a and b are constants. What is the effective value of adiabatic constant γ?

angular width of the first minimum on the other side of the central maximum due to a single slit of width a illuminated by a light of wavelength Lambda is

What area to be taken to find current density , is it any area in cross section?

\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt5}}}}}}}}}}}}}}}}=5n value of

The Laplace transform of a signal x(t) is given by , X(s)=s2+2s+1s2−s+1 if x(t)=δ(t)+2√3e0.5t(cos(√32t+θ))u(t), then θ equal to ______degrees. -30

A wire of length 5 m and radius 1 mm has resistance of 1 Ω. What length of the same material at the same temperature, and of radius 2 mm will also have a resistance of 1 Ω ?

Two conducting circular loops of radii R1 and R2 are placed in the same plane, with their centers coinciding. If R1&gt;&gt;R2, the mutual inductance M between them will be directly proportional to -

In the figure the string has a mass 4.5 g. How much time will it take for a transverse disturbance produced at the floor to reach the pulley? (Take g=10 ms−2)

In the figure below, masses mA=2 kg and mB=4 kg. For what minimum value of F, block A starts slipping over B (g=10 m/s2)

if the dis†an ce between two charges is incresed by 20% than its firce will be ?

A current of 10 A is established in a long wire along the positive z-axis . Find the magnetic field →B at the point (1 m,0,0).

18. Ka of water at 25

Three particles of same mass m are attached by massless rods of same length l and placed at the vertices of an equilateral triangle. The angular momentum about an axis XX′ will be nmωl24, where n is

A tuning fork producing sound of frequency 380 Hz is moving towards a wall with a velocity of 4 ms−1. The number of beats per second heard by a stationary listener produced due to direct and reflected sounds will be [speed of sound in air =340 ms−1]

When will a concave lens behave like a convex lens and when will a convex lens behave like a concave lens?

Two conducting circular loops of radii R1 and R2 are placed in the same plane, with their centers coinciding. If R1>>R2, the mutual inductance M between them will be directly proportional to -