50278 + Interview Questions in Physics

1.	P is a point on the line through the point A whose position vector is →a and the line is parallel to the vector →b . If \|−−→PA\|=6, the position vector of P is
Answer» $P$ is a point on the line through the point $A$ whose position vector is $\to a$ and the line is parallel to the vector $\to b$ . If $\| - - \to P A \| = 6$ , the position vector of $P$ is

Discussion

2.	A ballon is rising vertically upwards at a velocity of 3m/s. WHen it is at a height of 45m from the ground, a parachutist bails out from it. After 3s he opens his parachute and decelerates at constant rate of 5m/s. What was the height of parachutist above the ground when he opened his parachute? Tage g = 10m/s-2.
Answer» A ballon is rising vertically upwards at a velocity of 3m/s. WHen it is at a height of 45m from the ground, a parachutist bails out from it. After 3s he opens his parachute and decelerates at constant rate of 5m/s. What was the height of parachutist above the ground when he opened his parachute? Tage g = 10m/s^-2.

Discussion

3.	an infinite line charge is at the axis of a length 1m and 7cm if ekectric field at any point on the curved surface of cylinder is 250N/C then net ekectric flux through the cylinde
Answer» an infinite line charge is at the axis of a length 1m and 7cm if ekectric field at any point on the curved surface of cylinder is 250N/C then net ekectric flux through the cylinde

Discussion

4.	If a particle under S.H.M. has time period 0.1 sec and amplitude 2x10−3 m. It has maximum velocity [RPET 2000]
Answer» If a particle under S.H.M. has time period 0.1 sec and amplitude 2x $10^{- 3}$ m. It has maximum velocity [RPET 2000]

4.

If a particle under S.H.M. has time period 0.1 sec and amplitude 2x10−3 m. It has maximum velocity [RPET 2000]

Answer»

If a particle under S.H.M. has time period 0.1 sec and amplitude 2x $10^{- 3}$ m. It has maximum velocity

[RPET 2000]

Discussion

5.	The rms velocity of molecule in a sample of helium gas is 5/7th of the molecules in the sample of hydrogen If the temperature of hydrogen samples is 0 degree celcius then the temperature of helium sample about :
Answer» The rms velocity of molecule in a sample of helium gas is 5/7th of the molecules in the sample of hydrogen If the temperature of hydrogen samples is 0 degree celcius then the temperature of helium sample about :

Discussion

6.	A charge q of mas m is lying in a cylindrical region of magnetic field at point P. If magnetic field in the region is given by Bnot and P is at distance R from centre of region, find the speed of charge if the magnetic field is suddenly switch off.
Answer» A charge q of mas m is lying in a cylindrical region of magnetic field at point P. If magnetic field in the region is given by Bnot and P is at distance R from centre of region, find the speed of charge if the magnetic field is suddenly switch off.

Discussion

7.	A lift in which a man is standing, is moving upwards with a constant speed of 10 m s−1 . The man drops a coin from a height of 4.9 m. If g=9.8 m s−2, the coin reaches the floor of the lift after a time
Answer» A lift in which a man is standing, is moving upwards with a constant speed of $10 {m s}^{- 1}$ . The man drops a coin from a height of $4.9 m$ . If $g = 9.8 {m s}^{- 2}$ , the coin reaches the floor of the lift after a time

Discussion

8.

State the characteristics of Paramagnetic materials and give an example.

Answer»

State the characteristics of Paramagnetic materials

and give an example.

Discussion

9.	15 Threshold frequency of metal is 810 raise to 14 per second . What is kinetic energy of electron emmited having frequency 1.0 10 raise to 15 per second
Answer» 15 Threshold frequency of metal is 810 raise to 14 per second . What is kinetic energy of electron emmited having frequency 1.0 10 raise to 15 per second

Discussion

10.	A long straight wire is fixed horizontally and carries a current of 50A. A second wire having linear mass density 1*10^-4kg/m is placed parallel to and directly above this wire at a separation of 5mm. What current should the second wire carry so that magnetic repulsion can balance its weight?
Answer» A long straight wire is fixed horizontally and carries a current of 50A. A second wire having linear mass density 1*10^-4kg/m is placed parallel to and directly above this wire at a separation of 5mm. What current should the second wire carry so that magnetic repulsion can balance its weight?

Discussion

11.	A descending gradient of 1 in 20 meets an ascending gradient of 1 in 30. What will be length(in m) of a valley curve to fulfill comfort criterion for a design speed of 80 kmph.[Assume allowable rate of change of centrifugal acceleration 0.6 m/sec3 and answer correct upto one decimal place].78.2
Answer» A descending gradient of 1 in 20 meets an ascending gradient of 1 in 30. What will be length(in m) of a valley curve to fulfill comfort criterion for a design speed of 80 kmph. [Assume allowable rate of change of centrifugal acceleration 0.6 $m / s e c^{3}$ and answer correct upto one decimal place]. 78.2

Discussion

12.	A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7 m s–1. It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact? Would your answer be different if the elevator were stationary?
Answer» A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7 m s^–1. It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact? Would your answer be different if the elevator were stationary?

Discussion

13.	What is wavefront in Huygens wave theory explain.
Answer» What is wavefront in Huygens wave theory explain.

Discussion

14.	If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time.
Answer» If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time.

Discussion

15.	The surface tension of water in contact with air at 18∘C is 0.073 N/m. The pressure inside a droplet of water is to be 0.02 N/cm2 greater than the outside pressure. Calculate the diameter of the droplet of water.
Answer» The surface tension of water in contact with air at $18^{\circ} C$ is $0.073 N/m$ . The pressure inside a droplet of water is to be $0.02 {N/cm}^{2}$ greater than the outside pressure. Calculate the diameter of the droplet of water.

Discussion

16.	For Balmar series, wavelength of first line is λ1 and for Brackett series, wavelength of first line is λ2, then λ1/λ2 is?
Answer» For Balmar series, wavelength of first line is λ1 and for Brackett series, wavelength of first line is λ2, then λ1/λ2 is?

Discussion

17.	Water flows steadily through a horizontal pipe of variable cross section. If the pressure of water is P at a point where flow speed is v, the pressure at another point where the flow speed is 2v, is:
Answer» Water flows steadily through a horizontal pipe of variable cross section. If the pressure of water is P at a point where flow speed is v, the pressure at another point where the flow speed is 2v, is:

Discussion

18.	A capacitive motion transducer circuit is shown. The gap 'd' between the parallel plates of the capacitor is varied asd(t)=10−3[1+0.1sin(1000πt)]m. If the value of the capacitance is 2 pF at t = 0 ms, the output voltage Vo at t = 2 ms is
Answer» A capacitive motion transducer circuit is shown. The gap 'd' between the parallel plates of the capacitor is varied as $d (t) = 10^{- 3} [1 + 0.1 s i n (1000 π t)] m .$ If the value of the capacitance is 2 pF at t = 0 ms, the output voltage $V_{o}$ at t = 2 ms is

Discussion

19.	A homogeneous cylinder of mass M and radius R is pulled on a horizontal plane by a horizontal force For acting through its mass centre assuming rolling without slipping what is angular acceleration of cylinder
Answer» A homogeneous cylinder of mass M and radius R is pulled on a horizontal plane by a horizontal force For acting through its mass centre assuming rolling without slipping what is angular acceleration of cylinder

Discussion

20.	A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 m/s, at right angles to the horizontal component of the earth's magnetic field of 0.3×10−4 Wb/m2. The value of the induced emf in wire is:
Answer» A $10 m$ long horizontal wire extends from North East to South West. It is falling with a speed of $5.0 m/s$ , at right angles to the horizontal component of the earth's magnetic field of $0.3 \times 10^{- 4} {Wb/m}^{2}$ . The value of the induced emf in wire is:

Discussion

21.	A smooth sphere of radius R is made to translate in a straight line with a constant acceleration a=g. A particle kept on the top of the sphere is released from there at zero velocity with respect to the sphere. The speed of particle with respect to the sphere as a function of angle θ as it slides down is :Here g is acceleration due to gravity.
Answer» A smooth sphere of radius $R$ is made to translate in a straight line with a constant acceleration $a = g$ . A particle kept on the top of the sphere is released from there at zero velocity with respect to the sphere. The speed of particle with respect to the sphere as a function of angle $θ$ as it slides down is : Here $g$ is acceleration due to gravity.

Discussion

22.	A charge q moves with a constant velocity v parallel to the lines of force of a uniform magnetic field B. The force experienced by the charge q is
Answer» A charge q moves with a constant velocity v parallel to the lines of force of a uniform magnetic field B. The force experienced by the charge q is

Discussion

23.	Two particles of masses 1 kg and 2 kg have displacement vectors (7^i+2^j+3^k) m and (2^i+10^j+6^k) m. Find the displacement vector of the center of mass of the system.
Answer» Two particles of masses $1 kg$ and $2 kg$ have displacement vectors $(7^i + 2^j + 3^k) m$ and $(2^i + 10^j + 6^k) m$ . Find the displacement vector of the center of mass of the system.

Discussion

24.	3. What is osmotic pressure of a solution obtained by mixing equal volumes of decimolar BaCl2 and decimolar Na2SO4 and then filtering?
Answer» 3. What is osmotic pressure of a solution obtained by mixing equal volumes of decimolar BaCl2 and decimolar Na2SO4 and then filtering?

Discussion

25.	A small electric dipole is placed in x-y plane at origin with its dipole moment directed along positive x-axis. The direction of electric field at point (2,2root2 , 0) isOptions:Along positive z-axisShould have chosen Along positive y-axisAlong negative y-axisAlong negative z-axis
Answer» A small electric dipole is placed in x-y plane at origin with its dipole moment directed along positive x-axis. The direction of electric field at point (2,2root2 , 0) is Options: Along positive z-axis Should have chosen Along positive y-axis Along negative y-axis Along negative z-axis

Discussion

26.	Two vessels separately contain two ideal gases A and B at the same temperature. The pressure of A is twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is
Answer» Two vessels separately contain two ideal gases $A$ and $B$ at the same temperature. The pressure of $A$ is twice that of $B$ . Under such conditions, the density of $A$ is found to be 1.5 times the density of $B$ . The ratio of molecular weight of $A$ and $B$ is

Discussion

27.	Give two examples from everyday life where cathode Ray tubes are used?
Answer» Give two examples from everyday life where cathode Ray tubes are used?

Discussion

28.	in two systems of relations among velocity , accleration anf force are respectively v_2 = α_{2/β}v_1, a_2=αβ a_1 and F_2=F_{1/αβ.} if α and β are cons†an ts then relations among mass, length and time in two systems are
Answer» in two systems of relations among velocity , accleration anf force are respectively v_2 = α_{2/β}v_1, a_2=αβ a_1 and F_2=F_{1/αβ.} if α and β are cons†an ts then relations among mass, length and time in two systems are

Discussion

29.	The radiation from the sun, incident normally at the surface of the earth is 20 kcal/m2 min. What would have the radiant energy, incident normally on the earth, if the sun had a temperature twice of the present one?
Answer» The radiation from the sun, incident normally at the surface of the earth is $20 {kcal/m}^{2} min$ . What would have the radiant energy, incident normally on the earth, if the sun had a temperature twice of the present one?

Discussion

30.	Value of acceleration a0 so that block of mass m does not slip relative to wedge [All surfaces are frictionless]त्वरण a0 का मान क्या होगा, ताकि द्रव्यमान m का गुटका नत तल के सापेक्ष नहीं फिसले? [सभी पृष्ठ घर्षणहीन हैं]
Answer» Value of acceleration a₀ so that block of mass m does not slip relative to wedge [All surfaces are frictionless] त्वरण a₀ का मान क्या होगा, ताकि द्रव्यमान m का गुटका नत तल के सापेक्ष नहीं फिसले? [सभी पृष्ठ घर्षणहीन हैं]

Discussion

31.	Is there any lower limit to the electric force between two particles placex at a separation of 1 cm. Explain your answer
Answer» Is there any lower limit to the electric force between two particles placex at a separation of 1 cm. Explain your answer

Discussion

32.	A body starts from rest and slides down the inclined surface of a smooth inclined plane having inclination θ with the horizontal. The time taken by the body to reach the bottom is
Answer» A body starts from rest and slides down the inclined surface of a smooth inclined plane having inclination $θ$ with the horizontal. The time taken by the body to reach the bottom is

Discussion

33.	Which of the following processes will be least affected by the viscosity of water ?
Answer» Which of the following processes will be least affected by the viscosity of water ?

Discussion

34.	An artificial satellite is moving in a circular orbit around the earth with a speed of half the magnitude of escape velocity from the earth. The height of the satellite above the earth's surface is nR (R is radius of earth). Determine the value of n.
Answer» An artificial satellite is moving in a circular orbit around the earth with a speed of half the magnitude of escape velocity from the earth. The height of the satellite above the earth's surface is $n R (R$ is radius of earth $)$ . Determine the value of $n$ .

Discussion

35.	A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards east. The wire will experience a force directed towards which direction ?
Answer» A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards east. The wire will experience a force directed towards which direction ?

Discussion

36.	In a certain circuit, current changes with time as i=2√t. The r.m.s. value of current between t=2 s to t=4 s will be-
Answer» In a certain circuit, current changes with time as $i = 2 \sqrt{t} .$ The r.m.s. value of current between $t = 2 s$ to $t = 4 s$ will be-

Discussion

37.	A source of frequency f gives 5 beats per second when sounded with a source of frequency 200hz. The second harmonic of frequency 2f of source gives 10 beats per second when sounded with a source of frequency 420hz. The value of f is
Answer» A source of frequency f gives 5 beats per second when sounded with a source of frequency 200hz. The second harmonic of frequency 2f of source gives 10 beats per second when sounded with a source of frequency 420hz. The value of f is

Discussion

38.	A 70 kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3 m rotating about its vertical axis with 200 rev/min. The coefficient of friction between the wall and his clothing is 0.15. What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?
Answer» A 70 kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3 m rotating about its vertical axis with 200 rev/min. The coefficient of friction between the wall and his clothing is 0.15. What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?

Discussion

39.	A particle of mass m moves along a circle of radius R with a normal acceleration varying with time as an=bt2, where b is a constant. Find the mean value of power averaged over the first 2 seconds after the beginning of motion. (m=1,b=2,R=1)
Answer» A particle of mass m moves along a circle of radius $R$ with a normal acceleration varying with time as $a_{n} = b t^{2}$ , where b is a constant. Find the mean value of power averaged over the first 2 seconds after the beginning of motion. ( $m = 1, b = 2, R = 1$ )

Discussion

40.	(d) - 3, 1.259. Which one is not paramagnetic among thefollowing?As 33,CI-(a) Cl-ofBe= 4, Ne=10,(b) Be(d) As\lbrack at.17)no.1199812+(c) Ne
Answer» (d) - 3, 1.259. Which one is not paramagnetic among thefollowing?As 33,CI-(a) Cl-ofBe= 4, Ne=10,(b) Be(d) As\lbrack at.17)no.1199812+(c) Ne

Discussion

41.	In an arrangement shown in the figure, the mass of A=1 kg, the mass of B=2 kg, and coefficient of friction between A and B is 0.2. There is no friction between B and the ground. The frictional force on A is (Take g=10 m/s2)(Assume there is no slipping between the blocks).
Answer» In an arrangement shown in the figure, the mass of $A = 1 kg$ , the mass of $B = 2 kg$ , and coefficient of friction between $A$ and $B$ is $0.2$ . There is no friction between $B$ and the ground. The frictional force on $A$ is (Take $g = 10 {m/s}^{2}$ ) (Assume there is no slipping between the blocks).

Discussion

42.	A bus with a uniform acceleration covers a dis†an ce of 30km during first hour of its journey. Calculate the speed during second hour ,if the average spees of the us os 32km/hr along a straight road.
Answer» A bus with a uniform acceleration covers a dis†an ce of 30km during first hour of its journey. Calculate the speed during second hour ,if the average spees of the us os 32km/hr along a straight road.

Discussion

43.	Consider a slider crank mechanism with nonzero masses and inertia. A constant torque τ is applied on the crank as shown in the figure. Which of the following plots best resembles variation of crank angle, θ varsus time
Answer» Consider a slider crank mechanism with nonzero masses and inertia. A constant torque $τ$ is applied on the crank as shown in the figure. Which of the following plots best resembles variation of crank angle, $θ$ varsus time

Discussion

44.	Two pith balls each of mass M and charge Q are suspended from a point by weightless threads of length L. Both the Threads are separated by an angle theta with the vertical. The theta is small, the distance between two pith balls will be??
Answer» Two pith balls each of mass M and charge Q are suspended from a point by weightless threads of length L. Both the Threads are separated by an angle theta with the vertical. The theta is small, the distance between two pith balls will be??

Discussion

45.	8.A machine gun mounted on a 2000 kg car, on ahorizontal frictionless surface fires 10 bullets persecond. If the mass of each bullet is 10 g and thevelocity of each bullet is 500 m/s, then theacceleration of the car will be
Answer» 8. A machine gun mounted on a 2000 kg car, on a horizontal frictionless surface fires 10 bullets per second. If the mass of each bullet is 10 g and the velocity of each bullet is 500 m/s, then the acceleration of the car will be

Discussion

46.	A wave moves with speed 300m/s on a wire which is under a tension of 500N.Find how much the tension must be changed to increase the speed to 360m/
Answer» A wave moves with speed 300m/s on a wire which is under a tension of 500N.Find how much the tension must be changed to increase the speed to 360m/

Discussion

47.	81.What is the bond angle in NH4+ and what is its shape?
Answer» 81.What is the bond angle in NH4+ and what is its shape?

Discussion

48.	A slit of width d is illuminated by a light ofwavelength ( λ=6000 A), If the first minima falls at θ= 30^° , then value of d will be (1 )1.2 micron(3) 3250 A (4) 12×10^-m (2) 6 ×10^{-4} mm
Answer» A slit of width d is illuminated by a light ofwavelength ( λ=6000 A), If the first minima falls at θ= 30^° , then value of d will be (1 )1.2 micron(3) 3250 A (4) 12×10^-m (2) 6 ×10^{-4} mm

Discussion

49.	Select the odd one out
Answer» Select the odd one out

Discussion

50.	A 40 cm long wire having a mass 3.2 gm and area of cross section 1 mm2 is stretched between two supports 40.05 cm apart. In its fundamental mode, it vibrates with a frequency 100064 Hz. Find the Young's modulus of the wire.
Answer» A $40 cm$ long wire having a mass $3.2 gm$ and area of cross section $1 {mm}^{2}$ is stretched between two supports $40.05 cm$ apart. In its fundamental mode, it vibrates with a frequency $\frac{1000}{64} Hz$ . Find the Young's modulus of the wire.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

P is a point on the line through the point A whose position vector is →a and the line is parallel to the vector →b . If |−−→PA|=6, the position vector of P is

an infinite line charge is at the axis of a length 1m and 7cm if ekectric field at any point on the curved surface of cylinder is 250N/C then net ekectric flux through the cylinde

If a particle under S.H.M. has time period 0.1 sec and amplitude 2x10−3 m. It has maximum velocity [RPET 2000]

The rms velocity of molecule in a sample of helium gas is 5/7th of the molecules in the sample of hydrogen If the temperature of hydrogen samples is 0 degree celcius then the temperature of helium sample about :

A charge q of mas m is lying in a cylindrical region of magnetic field at point P. If magnetic field in the region is given by Bnot and P is at distance R from centre of region, find the speed of charge if the magnetic field is suddenly switch off.

A lift in which a man is standing, is moving upwards with a constant speed of 10 m s−1 . The man drops a coin from a height of 4.9 m. If g=9.8 m s−2, the coin reaches the floor of the lift after a time

State the characteristics of Paramagnetic materials and give an example.

15 Threshold frequency of metal is 810 raise to 14 per second . What is kinetic energy of electron emmited having frequency 1.0 10 raise to 15 per second

A long straight wire is fixed horizontally and carries a current of 50A. A second wire having linear mass density 1*10^-4kg/m is placed parallel to and directly above this wire at a separation of 5mm. What current should the second wire carry so that magnetic repulsion can balance its weight?

A descending gradient of 1 in 20 meets an ascending gradient of 1 in 30. What will be length(in m) of a valley curve to fulfill comfort criterion for a design speed of 80 kmph.[Assume allowable rate of change of centrifugal acceleration 0.6 m/sec3 and answer correct upto one decimal place].78.2

A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7 m s–1. It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact? Would your answer be different if the elevator were stationary?

What is wavefront in Huygens wave theory explain.

If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time.

The surface tension of water in contact with air at 18∘C is 0.073 N/m. The pressure inside a droplet of water is to be 0.02 N/cm2 greater than the outside pressure. Calculate the diameter of the droplet of water.

For Balmar series, wavelength of first line is λ1 and for Brackett series, wavelength of first line is λ2, then λ1/λ2 is?

Water flows steadily through a horizontal pipe of variable cross section. If the pressure of water is P at a point where flow speed is v, the pressure at another point where the flow speed is 2v, is:

A capacitive motion transducer circuit is shown. The gap 'd' between the parallel plates of the capacitor is varied asd(t)=10−3[1+0.1sin(1000πt)]m. If the value of the capacitance is 2 pF at t = 0 ms, the output voltage Vo at t = 2 ms is

A homogeneous cylinder of mass M and radius R is pulled on a horizontal plane by a horizontal force For acting through its mass centre assuming rolling without slipping what is angular acceleration of cylinder

A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 m/s, at right angles to the horizontal component of the earth's magnetic field of 0.3×10−4 Wb/m2. The value of the induced emf in wire is:

A charge q moves with a constant velocity v parallel to the lines of force of a uniform magnetic field B. The force experienced by the charge q is

Two particles of masses 1 kg and 2 kg have displacement vectors (7^i+2^j+3^k) m and (2^i+10^j+6^k) m. Find the displacement vector of the center of mass of the system.

3. What is osmotic pressure of a solution obtained by mixing equal volumes of decimolar BaCl2 and decimolar Na2SO4 and then filtering?

A small electric dipole is placed in x-y plane at origin with its dipole moment directed along positive x-axis. The direction of electric field at point (2,2root2 , 0) isOptions:Along positive z-axisShould have chosen Along positive y-axisAlong negative y-axisAlong negative z-axis

Two vessels separately contain two ideal gases A and B at the same temperature. The pressure of A is twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

Give two examples from everyday life where cathode Ray tubes are used?

in two systems of relations among velocity , accleration anf force are respectively v_2 = α_{2/β}v_1, a_2=αβ a_1 and F_2=F_{1/αβ.} if α and β are cons†an ts then relations among mass, length and time in two systems are

The radiation from the sun, incident normally at the surface of the earth is 20 kcal/m2 min. What would have the radiant energy, incident normally on the earth, if the sun had a temperature twice of the present one?

Is there any lower limit to the electric force between two particles placex at a separation of 1 cm. Explain your answer

A body starts from rest and slides down the inclined surface of a smooth inclined plane having inclination θ with the horizontal. The time taken by the body to reach the bottom is

Which of the following processes will be least affected by the viscosity of water ?

An artificial satellite is moving in a circular orbit around the earth with a speed of half the magnitude of escape velocity from the earth. The height of the satellite above the earth's surface is nR (R is radius of earth). Determine the value of n. ​​​​​​​

A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards east. The wire will experience a force directed towards which direction ?

In a certain circuit, current changes with time as i=2√t. The r.m.s. value of current between t=2 s to t=4 s will be-

A source of frequency f gives 5 beats per second when sounded with a source of frequency 200hz. The second harmonic of frequency 2f of source gives 10 beats per second when sounded with a source of frequency 420hz. The value of f is

A particle of mass m moves along a circle of radius R with a normal acceleration varying with time as an=bt2, where b is a constant. Find the mean value of power averaged over the first 2 seconds after the beginning of motion. (m=1,b=2,R=1)

(d) - 3, 1.259. Which one is not paramagnetic among thefollowing?As 33,CI-(a) Cl-ofBe= 4, Ne=10,(b) Be(d) As\lbrack at.17)no.1199812+(c) Ne

In an arrangement shown in the figure, the mass of A=1 kg, the mass of B=2 kg, and coefficient of friction between A and B is 0.2. There is no friction between B and the ground. The frictional force on A is (Take g=10 m/s2)(Assume there is no slipping between the blocks).

A bus with a uniform acceleration covers a dis†an ce of 30km during first hour of its journey. Calculate the speed during second hour ,if the average spees of the us os 32km/hr along a straight road.

Consider a slider crank mechanism with nonzero masses and inertia. A constant torque τ is applied on the crank as shown in the figure. Which of the following plots best resembles variation of crank angle, θ varsus time

Two pith balls each of mass M and charge Q are suspended from a point by weightless threads of length L. Both the Threads are separated by an angle theta with the vertical. The theta is small, the distance between two pith balls will be??

8.A machine gun mounted on a 2000 kg car, on ahorizontal frictionless surface fires 10 bullets persecond. If the mass of each bullet is 10 g and thevelocity of each bullet is 500 m/s, then theacceleration of the car will be

A wave moves with speed 300m/s on a wire which is under a tension of 500N.Find how much the tension must be changed to increase the speed to 360m/

81.What is the bond angle in NH4+ and what is its shape?

A slit of width d is illuminated by a light ofwavelength ( λ=6000 A), If the first minima falls at θ= 30^° , then value of d will be (1 )1.2 micron(3) 3250 A (4) 12×10^-m (2) 6 ×10^{-4} mm

Select the odd one out

A 40 cm long wire having a mass 3.2 gm and area of cross section 1 mm2 is stretched between two supports 40.05 cm apart. In its fundamental mode, it vibrates with a frequency 100064 Hz. Find the Young's modulus of the wire.

An artificial satellite is moving in a circular orbit around the earth with a speed of half the magnitude of escape velocity from the earth. The height of the satellite above the earth's surface is nR (R is radius of earth). Determine the value of n.