50278 + Interview Questions in Physics

1.	A flexible pipe of length l connects two points A and B in space having altitude difference h as shown in figure. A rope passed through the pipe is fixed at point A. What will be the acceleration of the rope as soon as it got released ? Assume that friction is absent inside the pipe.
Answer» A flexible pipe of length $l$ connects two points A and B in space having altitude difference $h$ as shown in figure. A rope passed through the pipe is fixed at point A. What will be the acceleration of the rope as soon as it got released ? Assume that friction is absent inside the pipe.

Discussion

2.	In a p-n junction, a potential barrier of 250 meV exists across the junction. A hole with a kinetic energy of 300 me V approaches the junction. Find the kinetic energy of the hole when it crosses the junction if the hole approached the junction (a) from the p-side and (b) from the n-side.
Answer» In a p-n junction, a potential barrier of 250 meV exists across the junction. A hole with a kinetic energy of 300 me V approaches the junction. Find the kinetic energy of the hole when it crosses the junction if the hole approached the junction (a) from the p-side and (b) from the n-side.

Discussion

3.	ntA simple electric motor has an armature resistance of 1 ohm and runs from a dc source of 12 V. It draws a current of 2 A when unloaded .When a certain load is connected to it,its speed reduces by 10 % of its initial value.The current drawn by bthe loaded motor isn
Answer» ntA simple electric motor has an armature resistance of 1 ohm and runs from a dc source of 12 V. It draws a current of 2 A when unloaded .When a certain load is connected to it,its speed reduces by 10 % of its initial value.The current drawn by bthe loaded motor isn

Discussion

4.	A stone is dropped into a river from a bridge 125 m above the water. Another stone is thrown vertically down 1.00 s after the front is dropped. The stones strike the water at the same time. Which of these is the correct position-time curve of the stones w.r.t. the person who is throwing them?
Answer» A stone is dropped into a river from a bridge 125 m above the water. Another stone is thrown vertically down 1.00 s after the front is dropped. The stones strike the water at the same time. Which of these is the correct position-time curve of the stones w.r.t. the person who is throwing them?

4.

A stone is dropped into a river from a bridge 125 m above the water. Another stone is thrown vertically down 1.00 s after the front is dropped. The stones strike the water at the same time. Which of these is the correct position-time curve of the stones w.r.t. the person who is throwing them?

Answer»

A stone is dropped into a river from a bridge 125 m above the water. Another stone is thrown vertically down 1.00 s after the front is dropped. The stones strike the water at the same time.

Which of these is the correct position-time curve of the stones w.r.t. the person who is throwing them?

Discussion

5.	Angle between acceleration and velocity when a body is moving in a straight line with uniform acceleration??
Answer» Angle between acceleration and velocity when a body is moving in a straight line with uniform acceleration??

Discussion

6.	16. In the circuit all bulbs consume same power. If resistance of bulb 1 is 36 ohm then resistance of bulb 3 and 4 are?
Answer» 16. In the circuit all bulbs consume same power. If resistance of bulb 1 is 36 ohm then resistance of bulb 3 and 4 are?

Discussion

7.	A wire of resistance R is bent in the form of a circle and is connected to a 220 V source as shown in the figure. If the energy provided by the source in 42 s is same as the energy required to raise the temperature of 11 kg of water through 44∘C. Find the value of R.
Answer» A wire of resistance $R$ is bent in the form of a circle and is connected to a $220 V$ source as shown in the figure. If the energy provided by the source in $42 s$ is same as the energy required to raise the temperature of $11 kg$ of water through $44^{\circ} C$ . Find the value of $R$ .

Discussion

8.	A car of mass 1×103 kg travelling at a velocity 5 m/s comes to rest in 2 sec, when it strikes a wall. What is the force exerted by the wall on car?
Answer» A car of mass $1 \times 10^{3} kg$ travelling at a velocity $5 m/s$ comes to rest in $2 sec$ , when it strikes a wall. What is the force exerted by the wall on car?

Discussion

9.	The cartesian form of the given plane →r=2^i+^j+^k+t(^i+2^j)+s(2^i+^j−^k) is
Answer» The cartesian form of the given plane $\to r = 2^i +^j +^k + t (^i + 2^j) + s (2^i +^j -^k)$ is

Discussion

10.	Three identical rods are joined and hinged at A as shown. If the angle made by the rod AB with vertical in equilibrium is θ, then θ is
Answer» Three identical rods are joined and hinged at A as shown. If the angle made by the rod AB with vertical in equilibrium is $θ$ , then $θ$ is

Discussion

11.	Find electric field ( in N C−1) at a distance 10 cm from a charge of 1 μC.
Answer» Find electric field $(in {N C}^{- 1})$ at a distance $10 cm$ from a charge of $1 μ C$ .

Discussion

12.	A heavy stone is thrown from a cliff oh height h with speed v. The stone ill hit the ground with maximum speed if it is thrown :
Answer» A heavy stone is thrown from a cliff oh height h with speed v. The stone ill hit the ground with maximum speed if it is thrown :

Discussion

13.	Two waves in the same medium are represented by y−t curves in the figure. Find the ratio of their average intensities.
Answer» Two waves in the same medium are represented by $y - t$ curves in the figure. Find the ratio of their average intensities.

Discussion

14.	If time taken by the projectile to reach B is T, thenAB is equal to(2) Tv cosθ(1) Tv sinθ (4) Tv tanθ(3) Tv sec
Answer» If time taken by the projectile to reach B is T, thenAB is equal to(2) Tv cosθ(1) Tv sinθ (4) Tv tanθ(3) Tv sec

Discussion

15.	The focal length of a concave mirror is 30cm.Find position of an object in front of the mirror,so that it's real image is three times the size of an object.?
Answer» The focal length of a concave mirror is 30cm.Find position of an object in front of the mirror,so that it's real image is three times the size of an object.?

Discussion

16.	In standard YDSE (D>>d>>λ) with identical slits S1 and S2, light reaching at point A on the screen opposite to slit S2 has an intensity I. It was also found that when only one of the two slits S1 and S2 was illuminated by same light beam, the intensity at A is still I. Now when a third slit S3 of four times the slit width(of S1), is made as shown (S1S2=S2S3=d)and all the three slits are illuminated, then the intensity of light reaching A is nI, where n is
Answer» In standard $Y D S E$ ( $D >> d >> λ$ ) with identical slits $S_{1}$ and $S_{2}$ , light reaching at point $A$ on the screen opposite to slit $S_{2}$ has an intensity $I$ . It was also found that when only one of the two slits $S_{1}$ and $S_{2}$ was illuminated by same light beam, the intensity at $A$ is still $I$ . Now when a third slit $S_{3}$ of four times the slit width(of $S_{1}$ ), is made as shown $(S_{1} S_{2} = S_{2} S_{3} = d)$ and all the three slits are illuminated, then the intensity of light reaching $A$ is $n I$ , where $n$ is

Discussion

17.	Find the current through 2 V battery.
Answer» Find the current through $2 V$ battery.

Discussion

18.	Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250 N on the surface ?
Answer» Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250 N on the surface ?

Discussion

19.	In LC oscillation maximum charge on capacitor can be Q if at any ins†an t electric energy and magnetic energy associated with circuit is equal then charge on capacitor at that ins†an t is
Answer» In LC oscillation maximum charge on capacitor can be Q if at any ins†an t electric energy and magnetic energy associated with circuit is equal then charge on capacitor at that ins†an t is

Discussion

20.	The current i in an induction coil varies with time t according to the graph shown in the figure. Which of the following graphs shows the induced emf in the coil with time ?
Answer» The current $i$ in an induction coil varies with time $t$ according to the graph shown in the figure. Which of the following graphs shows the induced emf in the coil with time ?

Discussion

21.	Two balls each of mass 0.05 kg are moving in opposite direction along the same straight line with the same speed of 6m/s . If they collide and rebound with the same speed what is the impulse imparted to each ball by the other !
Answer» Two balls each of mass 0.05 kg are moving in opposite direction along the same straight line with the same speed of 6m/s . If they collide and rebound with the same speed what is the impulse imparted to each ball by the other !

Discussion

22.	38.A tuning fork of frequency 200Hz is in unison with a sonometer wire.The number of beats heard per second when the tension is increased by 1% is .
Answer» 38.A tuning fork of frequency 200Hz is in unison with a sonometer wire.The number of beats heard per second when the tension is increased by 1% is .

Discussion

23.	Find the position of point P in a rectangular co-ordinate system of (1,0.5,2).
Answer» Find the position of point $P$ in a rectangular co-ordinate system of $(1, 0.5, 2)$ .

Discussion

24.	Which of the following graphs best represents the variation of resistivity (ρ) with temperature (T) for Manganin?
Answer» Which of the following graphs best represents the variation of resistivity $(ρ)$ with temperature $(T)$ for Manganin?

Discussion

25.	119.Magnetic field at a point (X,y,z) is given by B=s(X+y)^ k. Find force on the following loop shown in fig.
Answer» 119.Magnetic field at a point (X,y,z) is given by B=s(X+y)^ k. Find force on the following loop shown in fig.

Discussion

26.	Question 1Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.
Answer» Question 1 Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

Discussion

27.	A uniform electric field exists in x-y plane. The potential of points A(2m, 2m), B (-2m, 2m) and C (2m, 4m) are 4V , 16V and 12V respectively. The electric field is :
Answer» A uniform electric field exists in x-y plane. The potential of points A(2m, 2m), B (-2m, 2m) and C (2m, 4m) are 4V , 16V and 12V respectively. The electric field is :

Discussion

28.	two small conducting spheres are connected to the ends of the two identical springs as shown the spacing between the spheres is 0.05 m on charging each sphere to +1.6 uC, the separation between the spheres doubles. the spring constant of each spring is
Answer» two small conducting spheres are connected to the ends of the two identical springs as shown the spacing between the spheres is 0.05 m on charging each sphere to +1.6 uC, the separation between the spheres doubles. the spring constant of each spring is

Discussion

29.	18.A box of mass 50kg is kept on a horizontal floor.when it is pushed by a horizontal force H,it moves with a constant velocity.If it is pushed by a horizontal force 1.5H,it moves with an acceleration of 0.1metre/ second square.Find the value of H
Answer» 18.A box of mass 50kg is kept on a horizontal floor.when it is pushed by a horizontal force H,it moves with a constant velocity.If it is pushed by a horizontal force 1.5H,it moves with an acceleration of 0.1metre/ second square.Find the value of H

Discussion

30.	Two drivers spot in front of each other 80m apart they are travelling at 70 kmph and 60 kmph both apply brakes simultaneously which retard the cars at the rate of 5 metre per second square. which of the following statements is correct? (1)The collision will be averted(2)the collision will take place (3) they will cross Each Other (4)they will just collide
Answer» Two drivers spot in front of each other 80m apart they are travelling at 70 kmph and 60 kmph both apply brakes simultaneously which retard the cars at the rate of 5 metre per second square. which of the following statements is correct? (1)The collision will be averted(2)the collision will take place (3) they will cross Each Other (4)they will just collide

Discussion

31.	A string of 50cm long is under a tension of 20N force. If mass of string is 1g then frequency of fundamental mode i
Answer» A string of 50cm long is under a tension of 20N force. If mass of string is 1g then frequency of fundamental mode i

Discussion

32.	A block of mass 2kg is pushed against a rough vertical wall with a force of 40N cofficient of static friction being 0.5. Another horizontal force of 15N is applied on the block in a direction parallel to the wall. Will the block move if yes in which direction?
Answer» A block of mass 2kg is pushed against a rough vertical wall with a force of 40N cofficient of static friction being 0.5. Another horizontal force of 15N is applied on the block in a direction parallel to the wall. Will the block move if yes in which direction?

Discussion

33.	Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40,000 V?
Answer» Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40,000 V?

Discussion

34.	the diameter of the objective lens of a telescope is 5m and wavelength of light is 6000 Angstrom .The liit of resolution of the telescope is ?
Answer» the diameter of the objective lens of a telescope is 5m and wavelength of light is 6000 Angstrom .The liit of resolution of the telescope is ?

Discussion

35.	Two point charges A and B having charges +Q and −Q respectively are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes[1 Mark]
Answer» Two point charges $A$ and $B$ having charges $+ Q$ and $- Q$ respectively are placed at certain distance apart and force acting between them is $F$ . If $25$ % charge of $A$ is transferred to $B$ , then force between the charges becomes $[$ 1 Mark $]$

Discussion

36.	A glass prism of refractive index 1.5 is immersed in water (refractive index 43). A light beam normally on the face AB is totally reflected to reach on the face BC if
Answer» A glass prism of refractive index 1.5 is immersed in water (refractive index $\frac{4}{3}$ ). A light beam normally on the face AB is totally reflected to reach on the face BC if

Discussion

37.	A barometer reads 76 cm of mercury. If the tube is gradually inclined at an angle of 45∘ with the vertical, keeping the open end immersed in the reservoir, then the length of the mercury column will be -
Answer» A barometer reads $76 cm$ of mercury. If the tube is gradually inclined at an angle of $45^{\circ}$ with the vertical, keeping the open end immersed in the reservoir, then the length of the mercury column will be -

Discussion

38.	Find the rate of heat flow through a cross-section of the tapered conical rod shown in figure (Temperature of the big end(θ2)> Temperature of the small end(θ1)), with radius r1 and r2 at the small and big end respectively. Thermal conductivity of the material of the rod is K.
Answer» Find the rate of heat flow through a cross-section of the tapered conical rod shown in figure $($ Temperature of the big end $(θ_{2}) >$ Temperature of the small end $(θ_{1}))$ , with radius $r_{1}$ and $r_{2}$ at the small and big end respectively. Thermal conductivity of the material of the rod is K.

Discussion

39.	19. (i) What is residual entropy? (ii) Standard enthalpy of combustion.
Answer» 19. (i) What is residual entropy? (ii) Standard enthalpy of combustion.

Discussion

40.	A current i is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n, (a) Find the drift velocity v of the electrons, (b) If a magnetic field B exists in the region as shown in figure (34 - E12), What is the average magnetic force on the free electrons ? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length, This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will stop further accumulation of electrons, (d) What will be the potential difference developed across the width of the conductor due to the electron-accumulation ? The appearance of a transverse emf, when a current - carrying wire is placed in a magnetic field, is called Hall effect.
Answer» A current i is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n, (a) Find the drift velocity v of the electrons, (b) If a magnetic field B exists in the region as shown in figure (34 - E12), What is the average magnetic force on the free electrons ? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length, This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will stop further accumulation of electrons, (d) What will be the potential difference developed across the width of the conductor due to the electron-accumulation ? The appearance of a transverse emf, when a current - carrying wire is placed in a magnetic field, is called Hall effect.

40.

A current i is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n, (a) Find the drift velocity v of the electrons, (b) If a magnetic field B exists in the region as shown in figure (34 - E12), What is the average magnetic force on the free electrons ? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length, This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will stop further accumulation of electrons, (d) What will be the potential difference developed across the width of the conductor due to the electron-accumulation ? The appearance of a transverse emf, when a current - carrying wire is placed in a magnetic field, is called Hall effect.

Answer»

A current i is passed through a silver strip of width d and area of cross section A. The number of free electrons per unit volume is n, (a) Find the drift velocity v of the electrons, (b) If a magnetic field B exists in the region as shown in figure (34 - E12), What is the average magnetic force on the free electrons ? (c) Due to the magnetic force, the free electrons get accumulated on one side of the conductor along its length, This produces a transverse electric field in the conductor which opposes the magnetic force on the electrons. Find the magnitude of the electric field which will stop further accumulation of electrons, (d) What will be the potential difference developed across the width of the conductor due to the electron-accumulation ? The appearance of a transverse emf, when a current - carrying wire is placed in a magnetic field, is called Hall effect.

Discussion

41.	{}_{I_3^- write down electronic configuration of central iodine ato
Answer» {}_{I_3^- write down electronic configuration of central iodine ato

Discussion

42.	Give the formulae for the time of flight, maximum height reached and range for a projectile motion.
Answer» Give the formulae for the time of flight, maximum height reached and range for a projectile motion.

Discussion

43.	A circular coil of 100 turns has an effective radius 0.05 m and carries a current of 0.1 A. How much work is required to turn it in an external magnetic field of 1.5 weber/m2through 180∘ about an axis perpendicular to the magnetic field. The plane of the coil is initially perpendicular to the magnetic field.
Answer» A circular coil of $100$ turns has an effective radius $0.05 m$ and carries a current of $0.1 A$ . How much work is required to turn it in an external magnetic field of $1.5 {weber/m}^{2}$ through $180^{\circ}$ about an axis perpendicular to the magnetic field. The plane of the coil is initially perpendicular to the magnetic field.

Discussion

44.	Question 11A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (figure). Which of the following is true?(a) R1=R2=R3(b) R1>R2>R3(c) R3>R2>R1(d) R2>R3>R1
Answer» Question 11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances $R_{1}$ , $R_{2}$ and $R_{3}$ respectively (figure). Which of the following is true? (a) $R_{1} = R_{2} = R_{3}$ (b) $R_{1} > R_{2} > R_{3}$ (c) $R_{3} > R_{2} > R_{1}$ (d) $R_{2} > R_{3} > R_{1}$

Discussion

45.	The initial speed of a body of mass 2.0 kg is 5.0 ms−1. A force acts for 4 seconds in the direction of motion of the body. The force-time graph is shown in figure. Calculate the impulse of the force and also the final speed of the body.
Answer» The initial speed of a body of mass $2.0 kg$ is $5.0 {ms}^{- 1}$ . A force acts for 4 seconds in the direction of motion of the body. The force-time graph is shown in figure. Calculate the impulse of the force and also the final speed of the body.

Discussion

46.	Light of wavelength 0.6 mm from a sodium lamp falls on a photo cell and causesthe emission of photoelectrons for which the stopping potential is 0.5 V. With lightof wavelength 0.4 mm from a mercury lamp the stopping potential is 1.5 V. Then,the work function in eV of the photocell surface is
Answer» Light of wavelength 0.6 mm from a sodium lamp falls on a photo cell and causes the emission of photoelectrons for which the stopping potential is 0.5 V. With light of wavelength 0.4 mm from a mercury lamp the stopping potential is 1.5 V. Then, the work function in eV of the photocell surface is

Discussion

47.	The minimum value of sin(θ)cos(θ) is
Answer» The minimum value of $sin (θ) cos (θ)$ is

Discussion

48.	Time period of a pendulum, on a satellite orbitingthe earth, is(2) Zero(4) Infinity3)
Answer» Time period of a pendulum, on a satellite orbitingthe earth, is(2) Zero(4) Infinity3)

Discussion

49.	When both source and observer moves then what is the change in in wavelengthFrom doppler effect
Answer» When both source and observer moves then what is the change in in wavelength From doppler effect

Discussion

50.	Polonium (84Po210) emits 2α4 particles and is converted into lead (82Pb206). This reaction is used for producing electric power in a space mission. Po210 has a half-life of 138.6 days. Assuming an efficiency of 10% of the thermoelectric machine, how much Po210 is required to produce 1.2×107 J of electric energy per day at the end of 693 days?Given masses of the nuclei Po210=209.98264 amu, Pb206=205.97440 amu,α4=4.00260 amu, 1 amu×c2=931 MeVAvogadro number= 6×1023.
Answer» Polonium $(_{84} {Po}^{210})$ emits $_{2} α^{4}$ particles and is converted into lead $(_{82} {Pb}^{206})$ . This reaction is used for producing electric power in a space mission. ${Po}^{210}$ has a half-life of $138.6 days$ . Assuming an efficiency of $10 %$ of the thermoelectric machine, how much ${Po}^{210}$ is required to produce $1.2 \times 10^{7} J$ of electric energy per day at the end of $693 days$ ? $Given masses of the nuclei {Po}^{210} = 209.98264 amu, {Pb}^{206} = 205.97440 amu, α^{4} = 4.00260 amu, 1 amu \times c^{2} = 931 MeV Avogadro number= 6 \times 10^{23} .$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A flexible pipe of length l connects two points A and B in space having altitude difference h as shown in figure. A rope passed through the pipe is fixed at point A. What will be the acceleration of the rope as soon as it got released ? Assume that friction is absent inside the pipe.

In a p-n junction, a potential barrier of 250 meV exists across the junction. A hole with a kinetic energy of 300 me V approaches the junction. Find the kinetic energy of the hole when it crosses the junction if the hole approached the junction (a) from the p-side and (b) from the n-side.

ntA simple electric motor has an armature resistance of 1 ohm and runs from a dc source of 12 V. It draws a current of 2 A when unloaded .When a certain load is connected to it,its speed reduces by 10 % of its initial value.The current drawn by bthe loaded motor isn

A stone is dropped into a river from a bridge 125 m above the water. Another stone is thrown vertically down 1.00 s after the front is dropped. The stones strike the water at the same time. Which of these is the correct position-time curve of the stones w.r.t. the person who is throwing them?

Angle between acceleration and velocity when a body is moving in a straight line with uniform acceleration??

16. In the circuit all bulbs consume same power. If resistance of bulb 1 is 36 ohm then resistance of bulb 3 and 4 are?

A wire of resistance R is bent in the form of a circle and is connected to a 220 V source as shown in the figure. If the energy provided by the source in 42 s is same as the energy required to raise the temperature of 11 kg of water through 44∘C. Find the value of R.

A car of mass 1×103 kg travelling at a velocity 5 m/s comes to rest in 2 sec, when it strikes a wall. What is the force exerted by the wall on car?

The cartesian form of the given plane →r=2^i+^j+^k+t(^i+2^j)+s(2^i+^j−^k) is

Three identical rods are joined and hinged at A as shown. If the angle made by the rod AB with vertical in equilibrium is θ, then θ is

Find electric field ( in N C−1) at a distance 10 cm from a charge of 1 μC.

A heavy stone is thrown from a cliff oh height h with speed v. The stone ill hit the ground with maximum speed if it is thrown :

Two waves in the same medium are represented by y−t curves in the figure. Find the ratio of their average intensities.

If time taken by the projectile to reach B is T, thenAB is equal to(2) Tv cosθ(1) Tv sinθ (4) Tv tanθ(3) Tv sec

The focal length of a concave mirror is 30cm.Find position of an object in front of the mirror,so that it's real image is three times the size of an object.?

Find the current through 2 V battery.

Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250 N on the surface ?

In LC oscillation maximum charge on capacitor can be Q if at any ins†an t electric energy and magnetic energy associated with circuit is equal then charge on capacitor at that ins†an t is

The current i in an induction coil varies with time t according to the graph shown in the figure. Which of the following graphs shows the induced emf in the coil with time ?

Two balls each of mass 0.05 kg are moving in opposite direction along the same straight line with the same speed of 6m/s . If they collide and rebound with the same speed what is the impulse imparted to each ball by the other !

38.A tuning fork of frequency 200Hz is in unison with a sonometer wire.The number of beats heard per second when the tension is increased by 1% is .

Find the position of point P in a rectangular co-ordinate system of (1,0.5,2).

Which of the following graphs best represents the variation of resistivity (ρ) with temperature (T) for Manganin?

119.Magnetic field at a point (X,y,z) is given by B=s(X+y)^ k. Find force on the following loop shown in fig.

Question 1Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

A uniform electric field exists in x-y plane. The potential of points A(2m, 2m), B (-2m, 2m) and C (2m, 4m) are 4V , 16V and 12V respectively. The electric field is :

two small conducting spheres are connected to the ends of the two identical springs as shown the spacing between the spheres is 0.05 m on charging each sphere to +1.6 uC, the separation between the spheres doubles. the spring constant of each spring is

18.A box of mass 50kg is kept on a horizontal floor.when it is pushed by a horizontal force H,it moves with a constant velocity.If it is pushed by a horizontal force 1.5H,it moves with an acceleration of 0.1metre/ second square.Find the value of H

A string of 50cm long is under a tension of 20N force. If mass of string is 1g then frequency of fundamental mode i

A block of mass 2kg is pushed against a rough vertical wall with a force of 40N cofficient of static friction being 0.5. Another horizontal force of 15N is applied on the block in a direction parallel to the wall. Will the block move if yes in which direction?

Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40,000 V?

the diameter of the objective lens of a telescope is 5m and wavelength of light is 6000 Angstrom .The liit of resolution of the telescope is ?

Two point charges A and B having charges +Q and −Q respectively are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes​​​​​​​[1 Mark]

A glass prism of refractive index 1.5 is immersed in water (refractive index 43). A light beam normally on the face AB is totally reflected to reach on the face BC if

A barometer reads 76 cm of mercury. If the tube is gradually inclined at an angle of 45∘ with the vertical, keeping the open end immersed in the reservoir, then the length of the mercury column will be -

Find the rate of heat flow through a cross-section of the tapered conical rod shown in figure (Temperature of the big end(θ2)&gt; Temperature of the small end(θ1)), with radius r1 and r2 at the small and big end respectively. Thermal conductivity of the material of the rod is K.

19. (i) What is residual entropy? (ii) Standard enthalpy of combustion.

{}_{I_3^- write down electronic configuration of central iodine ato

Give the formulae for the time of flight, maximum height reached and range for a projectile motion.

Question 11A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (figure). Which of the following is true?(a) R1=R2=R3(b) R1&gt;R2&gt;R3(c) R3&gt;R2&gt;R1(d) R2&gt;R3&gt;R1

The initial speed of a body of mass 2.0 kg is 5.0 ms−1. A force acts for 4 seconds in the direction of motion of the body. The force-time graph is shown in figure. Calculate the impulse of the force and also the final speed of the body.

Light of wavelength 0.6 mm from a sodium lamp falls on a photo cell and causesthe emission of photoelectrons for which the stopping potential is 0.5 V. With lightof wavelength 0.4 mm from a mercury lamp the stopping potential is 1.5 V. Then,the work function in eV of the photocell surface is

The minimum value of sin(θ)cos(θ) is

Time period of a pendulum, on a satellite orbitingthe earth, is(2) Zero(4) Infinity3)

When both source and observer moves then what is the change in in wavelengthFrom doppler effect

Two point charges A and B having charges +Q and −Q respectively are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes[1 Mark]

Find the rate of heat flow through a cross-section of the tapered conical rod shown in figure (Temperature of the big end(θ2)> Temperature of the small end(θ1)), with radius r1 and r2 at the small and big end respectively. Thermal conductivity of the material of the rod is K.

Question 11A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (figure). Which of the following is true?(a) R1=R2=R3(b) R1>R2>R3(c) R3>R2>R1(d) R2>R3>R1