50278 + Interview Questions in Physics

1.	Certain neutron stars are believed to be rotating at about 1 rec/sec. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be
Answer» Certain neutron stars are believed to be rotating at about 1 rec/sec. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be

Discussion

2.	1 joule of energy is to be converted into new system of units in which lenght is measured in 10metre, mass in 10kg and time in 1minute. The numerical value of 1 J in the new system is?
Answer» 1 joule of energy is to be converted into new system of units in which lenght is measured in 10metre, mass in 10kg and time in 1minute. The numerical value of 1 J in the new system is?

Discussion

3.	If y=y(x) is an implicit function of x such that loge(x+y)=4xy, then d2ydx2 at x=0 is equal to
Answer» If $y = y (x)$ is an implicit function of $x$ such that ${log}_{e} (x + y) = 4 x y,$ then $\frac{d^{2} y}{d x^{2}}$ at $x = 0$ is equal to

Discussion

4.	If an object subtend angle of 2∘ at eye when seen through telescope having objective and eyepiece of focal length f0=60cm and fe=5cm respectively then angle subtend by image at eye piece will be
Answer» If an object subtend angle of $2^{\circ}$ at eye when seen through telescope having objective and eyepiece of focal length $f_{0} = 60 c m$ and $f_{e} = 5 c m$ respectively then angle subtend by image at eye piece will be

Discussion

5.	spring A has a spring constabt double of B.when a and b are streched by appluing equal force,the find energy stored in b if the ebergy stored in a is
Answer» spring A has a spring constabt double of B.when a and b are streched by appluing equal force,the find energy stored in b if the ebergy stored in a is

Discussion

6.	ntThe centre of a wheel rolling on a plane surface moves with a speed v.A particle on the rim of the wheel at the same level as the centre will be moving at speedn nta)zeron ntb)vn ntc)square root of vn ntd)2vn
Answer» ntThe centre of a wheel rolling on a plane surface moves with a speed v.A particle on the rim of the wheel at the same level as the centre will be moving at speedn nta)zeron ntb)vn ntc)square root of vn ntd)2vn

Discussion

7.	A circular disc of radius 100 mm and mass 1 kg, initially at rest at position A, rolls without slipping down a curved path as shown in figure. The speed v of the disc when it reaches position B isms.Acceleration due to gravity, g=ms2.
Answer» A circular disc of radius 100 mm and mass 1 kg, initially at rest at position A, rolls without slipping down a curved path as shown in figure. The speed v of the disc when it reaches position B is $\frac{m}{s}$ . Acceleration due to gravity, $g = \frac{m}{s^{2}}$ .

Discussion

8.	An object is thrown with velocity u, vertically upward. Its acceleration-time graph is:
Answer» An object is thrown with velocity u, vertically upward. Its acceleration-time graph is:

Discussion

9.	(i) Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other. (ii) Which stoichiometric defect does not change the density of the crystal?
Answer» (i) Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other. (ii) Which stoichiometric defect does not change the density of the crystal?

Discussion

10.	A body executes simple harmonic motion under the action of a force F1 with a time period (4/5) seconds. If the force is changed to F2, it executes SHM with time period (3/5) seconds. If both the forces F1 and F2 act simultaneously in the same direction on the body, its time period (in seconds) is
Answer» A body executes simple harmonic motion under the action of a force $F_{1}$ with a time period $(4 / 5)$ seconds. If the force is changed to $F_{2}$ , it executes SHM with time period $(3 / 5)$ seconds. If both the forces $F_{1}$ and $F_{2}$ act simultaneously in the same direction on the body, its time period (in seconds) is

Discussion

11.	A circular wire frame is made of four uniform quarter circular wires of same radius and of mass per unit length λ,2λ,3λ and 4λ as shown in figure. Assuming the origin to be at the centre of the circle, which of the following options is (are) correct?
Answer» A circular wire frame is made of four uniform quarter circular wires of same radius and of mass per unit length $λ, 2 λ, 3 λ$ and $4 λ$ as shown in figure. Assuming the origin to be at the centre of the circle, which of the following options is (are) correct?

Discussion

12.	32. A particle is projected vertically up with velocity v=\sqrt{}4gRe/3 from earth surface .the velocity of particle at height equal to half of the maximum height reached by it??
Answer» 32. A particle is projected vertically up with velocity v=\sqrt{}4gRe/3 from earth surface .the velocity of particle at height equal to half of the maximum height reached by it??

Discussion

13.	In the Young’s double slit experiment apparatus shown in figure, the ratio of maximum to minimum intensity on the screen is 9. The wavelength of light used is λ, then the value of y is
Answer» In the Young’s double slit experiment apparatus shown in figure, the ratio of maximum to minimum intensity on the screen is 9. The wavelength of light used is $λ$ , then the value of y is

13.

In the Young’s double slit experiment apparatus shown in figure, the ratio of maximum to minimum intensity on the screen is 9. The wavelength of light used is λ, then the value of y is

Answer»

In the Young’s double slit experiment apparatus shown in figure, the ratio of maximum to minimum intensity on the screen is 9. The wavelength of light used is $λ$ , then the value of y is

Discussion

14.	Two identical charges are placed 3m apar in air experiences a Coulomb's force of 9*10 N. The magnitude of charge is
Answer» Two identical charges are placed 3m apar in air experiences a Coulomb's force of 9*10 N. The magnitude of charge is

Discussion

15.	Why doesn't the light from the moon coming to us undergo dispersion while the sun's light undergoes dispersion and seems yellowish?
Answer» Why doesn't the light from the moon coming to us undergo dispersion while the sun's light undergoes dispersion and seems yellowish?

Discussion

16.	A metal vessel of negligible heat capacity contains 0.5 kg of water (of specific heat capacity 4200 J kg−1K−1). It is heated from 15∘C to 85∘C by a 750 W immersion heater in 4 minutes. The average loss of heat in watts to the surroundings, from the vessel during this time, is nearly:
Answer» A metal vessel of negligible heat capacity contains $0.5 kg$ of water (of specific heat capacity $4200 {J kg}^{- 1} K^{- 1})$ . It is heated from $15^{\circ} C$ to $85^{\circ} C$ by a $750 W$ immersion heater in 4 minutes. The average loss of heat in watts to the surroundings, from the vessel during this time, is nearly:

Discussion

17.	Which of the following relation is true for the specific heat capacity of substance?
Answer» Which of the following relation is true for the specific heat capacity of substance?

Discussion

18.	32.Consider an electric field E=E (nought) in +x direction. Find the flux through the shaded area due to this field.
Answer» 32.Consider an electric field E=E (nought) in +x direction. Find the flux through the shaded area due to this field.

Discussion

19.	4. linear acceleration of cylinder of mass M2 is a2 then angular acceleration α 2 is(given that there is no slipping) (a) a2/R (b) (a2+g)/R (c) 2(a2+g)/R (d) none of these
Answer» 4. linear acceleration of cylinder of mass M2 is a2 then angular acceleration α 2 is(given that there is no slipping) (a) a2/R (b) (a2+g)/R (c) 2(a2+g)/R (d) none of these

Discussion

20.	Question 4Which is a thermosetting plastic?(a) Melamine(b) Polythene(c) PVC(d) Nylon
Answer» Question 4 Which is a thermosetting plastic? (a) Melamine (b) Polythene (c) PVC (d) Nylon

Discussion

21.	53.Ratio of acceleration of block A(10kg) placed on smooth incline, with block B(20kg) placed on rough incline is 2:1. Find coefficient of kinetic friction between block B and incline.
Answer» 53.Ratio of acceleration of block A(10kg) placed on smooth incline, with block B(20kg) placed on rough incline is 2:1. Find coefficient of kinetic friction between block B and incline.

Discussion

22.	A rectangular wire loop of sides 8 cm and 2 cm with a small cut ismoving out of a region of uniform magnetic field of magnitude 0.3 Tdirected normal to the loop. What is the emf developed across thecut if the velocity of the loop is 1 cm s–1 in a direction normal to the(a) longer side, (b) shorter side of the loop? For how long does theinduced voltage last in each case?
Answer» A rectangular wire loop of sides 8 cm and 2 cm with a small cut ismoving out of a region of uniform magnetic field of magnitude 0.3 Tdirected normal to the loop. What is the emf developed across thecut if the velocity of the loop is 1 cm s–1 in a direction normal to the(a) longer side, (b) shorter side of the loop? For how long does theinduced voltage last in each case?

Discussion

23.	A parallel beam of light is incident from air at an angle α on the side PQ of a right-angled triangular prism of refractive index n=√2. Light undergoes total internal reflection in the prism at the face PR when α has minimum value of 45∘. The angle θ of the prism is
Answer» A parallel beam of light is incident from air at an angle $α$ on the side PQ of a right-angled triangular prism of refractive index $n = \sqrt{2}$ . Light undergoes total internal reflection in the prism at the face $P R$ when $α$ has minimum value of $45^{\circ}$ . The angle $θ$ of the prism is

Discussion

24.	A 400 V dc series motor drives a load at rated voltage by drawing 20 A current running at the speed of 2000 rpm. The total series resistance is 1.4 Ω. Assuming magnetic circuit to be linear, load torque is increased 49%, the speed of the motor in rpm will be _____. (Answer upto 2 decimal places)1611.48
Answer» A 400 V dc series motor drives a load at rated voltage by drawing 20 A current running at the speed of 2000 rpm. The total series resistance is $1.4 Ω$ . Assuming magnetic circuit to be linear, load torque is increased 49%, the speed of the motor in rpm will be _____. (Answer upto 2 decimal places) 1611.48

Discussion

25.	A wire of length L and cross-sectional area A is made of a material of Young's modulus Y. If the wire is stretched by an amount x, the work done during the stretching is
Answer» A wire of length $L$ and cross-sectional area $A$ is made of a material of Young's modulus $Y$ . If the wire is stretched by an amount $x$ , the work done during the stretching is

Discussion

26.	A conducting ring of mass 2 kg and radius 0.5 m is placed on a smooth horizontal plane. The ring carries a current of i=4 A. A horizontal magnetic field B=10 T is switched on at time t=0 as shown in figure. The initial angular acceleration of the ring will be:
Answer» A conducting ring of mass $2 k g$ and radius $0.5 m$ is placed on a smooth horizontal plane. The ring carries a current of $i = 4 A$ . A horizontal magnetic field $B = 10 T$ is switched on at time $t = 0$ as shown in figure. The initial angular acceleration of the ring will be:

Discussion

27.	8. The distance traveled by a body starting from restand travelling with uniform acceleration, insuccessive intervals of time of equal duration will bein the ratio
Answer» 8. The distance traveled by a body starting from restand travelling with uniform acceleration, insuccessive intervals of time of equal duration will bein the ratio

Discussion

28.	A compound alloy of gold and copper crystallises in a cubic lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. What is the formula of this alloy compound?
Answer» A compound alloy of gold and copper crystallises in a cubic lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. What is the formula of this alloy compound?

Discussion

29.	The P-V diagram of 2 gm of helium gas for a certain process A → B is shown in the figure. what is the heat given to the gas during the process A → B
Answer» The P-V diagram of 2 gm of helium gas for a certain process A $\to$ B is shown in the figure. what is the heat given to the gas during the process A $\to$ B

Discussion

30.	A discrete-time LTI system with the property such that if the input is x(n)=(12)nu(n)−14(12)n−1u(n−1)and output y(n)=(13)nu(n)The impulse response of the system is
Answer» A discrete-time LTI system with the property such that if the input is $x (n) = {(\frac{1}{2})}^{n} u (n) - \frac{1}{4} {(\frac{1}{2})}^{n - 1} u (n - 1)$ and output $y (n) = {(\frac{1}{3})}^{n} u (n)$ The impulse response of the system is

Discussion

31.	for a particle moving on circle of radius 2m the dis†an ce as fn of time is s=tsqaure the acceleration at t=2 sec i
Answer» for a particle moving on circle of radius 2m the dis†an ce as fn of time is s=tsqaure the acceleration at t=2 sec i

Discussion

32.	Three identical capacitors C1,C2 and C3 have a capacitance of 1μF each, and they are uncharged initially. Then they are connected in a circuit as shown in the figure and C1 is filled completely with a dielectric material of relative permittivity εr. The cell's electromotive force (emf) is V0=8 V. First the switch S1 is closed while the switch S2 is kept open. When the capacitor C3 is fully charged, S1 is opened and S2 is closed simultaneously.When all the capacitors reach equilibrium state (steady condition), the charge on C3 is found to be 5 μC. The value of εr is (Upto one decimal places)
Answer» Three identical capacitors $C_{1}, C_{2}$ and $C_{3}$ have a capacitance of $1 μ F$ each, and they are uncharged initially. Then they are connected in a circuit as shown in the figure and $C_{1}$ is filled completely with a dielectric material of relative permittivity $ε_{r}$ . The cell's electromotive force (emf) is $V_{0} = 8 V$ . First the switch $S_{1}$ is closed while the switch $S_{2}$ is kept open. When the capacitor $C_{3}$ is fully charged, $S_{1}$ is opened and $S_{2}$ is closed simultaneously. When all the capacitors reach equilibrium state (steady condition), the charge on $C_{3}$ is found to be $5 μ C$ . The value of $ε_{r}$ is (Upto one decimal places)

Discussion

33.	The ratio of radii of two wires of the same material is 2:1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be
Answer» The ratio of radii of two wires of the same material is $2 : 1$ . If these wires are stretched by equal forces, then the ratio of stresses produced in them will be

Discussion

34.	A conducting wire bent in the form of a parabola x2 = 4y carries a current i = 1 A as shown in the figure. This wire is placed in uniform magnetic field →B=(5^k) T. The magnetic force on the wire isएक परवलय x2 = 4y की आकृति में मुड़ा हुआ एक चालक तार चित्रानुसार धारा i = 1 A ग्रहण किए हुए है। इस तार को एकसमान चुम्बकीय क्षेत्र →B=(5^k) T में रखा जाता है। तार पर चुम्बकीय बल है
Answer» A conducting wire bent in the form of a parabola x² = 4y carries a current i = 1 A as shown in the figure. This wire is placed in uniform magnetic field $\to B = (5^k) T$ . The magnetic force on the wire is एक परवलय x² = 4y की आकृति में मुड़ा हुआ एक चालक तार चित्रानुसार धारा i = 1 A ग्रहण किए हुए है। इस तार को एकसमान चुम्बकीय क्षेत्र $\to B = (5^k) T$ में रखा जाता है। तार पर चुम्बकीय बल है

Discussion

35.	A uniform rod of mass 200 grams and length L = 1 m is initially at rest in vertical position. The rod is hinged at the centre such that it can rotate freely without friction about a fixed horizontal axis passing through its centre. Two particles of mass m = 100 grams, each having horizontal velocity of equal magnitude u = 6 m/s strike the rod at the top and bottom simultaneously as shown, and stick to the rod. The angular speed (in rad/sec.) of the rod when it becomes horizontal is . Write upto two digits after the decimal point.
Answer» A uniform rod of mass 200 grams and length L = 1 m is initially at rest in vertical position. The rod is hinged at the centre such that it can rotate freely without friction about a fixed horizontal axis passing through its centre. Two particles of mass m = 100 grams, each having horizontal velocity of equal magnitude u = 6 m/s strike the rod at the top and bottom simultaneously as shown, and stick to the rod. The angular speed (in rad/sec.) of the rod when it becomes horizontal is . Write upto two digits after the decimal point.

Discussion

36.	Lightincident normally on a plane mirror attached to a galvanometer coilretraces backwards as shown in Fig. 9.36. A current in the coilproduces a deflection of 3.5°of the mirror. What is the displacement of the reflected spot oflight on a screen placed 1.5 m away?
Answer» Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards as shown in Fig. 9.36. A current in the coil produces a deflection of 3.5° of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?

36.

Lightincident normally on a plane mirror attached to a galvanometer coilretraces backwards as shown in Fig. 9.36. A current in the coilproduces a deflection of 3.5°of the mirror. What is the displacement of the reflected spot oflight on a screen placed 1.5 m away?

Answer»

Light
incident normally on a plane mirror attached to a galvanometer coil
retraces backwards as shown in Fig. 9.36. A current in the coil
produces a deflection of 3.5°
of the mirror. What is the displacement of the reflected spot of
light on a screen placed 1.5 m away?

Discussion

37.	If gravitational potential at surface of earth is v then Fing gravitational potential at a height equal to half of the radius of the earth
Answer» If gravitational potential at surface of earth is v then Fing gravitational potential at a height equal to half of the radius of the earth

Discussion

38.	According to the classical wave picture of light, how would the current versus potential (between the plates) graph vary upon varying intensity?
Answer» According to the classical wave picture of light, how would the current versus potential (between the plates) graph vary upon varying intensity?

Discussion

39.	The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to
Answer» The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

39.

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

Answer»

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

Discussion

40.	A solid sphere falls with a terminal velocity of 20 m s-1 in air. If it is allowed to fall in vacuum,
Answer» A solid sphere falls with a terminal velocity of 20 m s^-1 in air. If it is allowed to fall in vacuum,

Discussion

41.	A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newton. What is the reading of the machine when the lift is stationary? Take g=9.8 ms−2
Answer» A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newton. What is the reading of the machine when the lift is stationary? Take $g = 9.8 m s^{- 2}$

Discussion

42.	An electric ﬁeld of 1500 Vm−1 and a magnetic ﬁeld of 0.4 Wb/m2 act on a moving electron. The minimum uniform speed along a straight line the electron could have so that it doesnot deviate from its path is
Answer» An electric ﬁeld of $1500 V m^{- 1}$ and a magnetic ﬁeld of $0.4 Wb / m^{2}$ act on a moving electron. The minimum uniform speed along a straight line the electron could have so that it doesnot deviate from its path is

Discussion

43.	The variation of current and voltage in a conductor has been shown in figure. The conductance of the conductor is (Give your answer in Ω−1).
Answer» The variation of current and voltage in a conductor has been shown in figure. The conductance of the conductor is (Give your answer in $Ω^{- 1}$ ).

Discussion

44.	if the error in measurement of momentum of a particle is 10% and masses on exactly the permissible error in determination of kinetic energy
Answer» if the error in measurement of momentum of a particle is 10% and masses on exactly the permissible error in determination of kinetic energy

Discussion

45.	A particle is projected with speed v0 at an angle theta from horizontal the average velocity of particle
Answer» A particle is projected with speed v0 at an angle theta from horizontal the average velocity of particle

Discussion

46.	iIf the unit of force is kN ,the length is 1 km and time 100s ,then what will be the unit of mass ?
Answer» iIf the unit of force is kN ,the length is 1 km and time 100s ,then what will be the unit of mass ?

Discussion

47.	A balloon of diameter 20m Weighs 100kg. Calculate its payload if it is filled with helium at 1.0 atm and 27∘. Density of air is 1.2 Kgm−3 (R = 0.082 dm3 atm K−1mole−1)
Answer» A balloon of diameter 20m Weighs 100kg. Calculate its payload if it is filled with helium at 1.0 atm and $27^{\circ}$ . Density of air is $1.2 K g m^{- 3}$ (R = 0.082 $d m^{3} a t m K^{- 1} m o l e^{- 1}$ )

Discussion

48.	Sir I have a dout on what are electron cloud.🙏
Answer» Sir I have a dout on what are electron cloud.🙏

Discussion

49.	A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is
Answer» A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is

Discussion

50.	2The reduction potential of hydrogen half cell will be negative if(1) P(H2) =1 bar and \lbrack H'\rbrack= 1 M (2) P(H2)= 1 bar and \lbrack H^+\rbrack 2M (3) P(H2)= 2 bar and \lbrack H^+\rbrack= 1 M (4) P(H2)= 2 bar and \lbrack H\ast\rbrack= 2 M
Answer» 2The reduction potential of hydrogen half cell will be negative if(1) P(H2) =1 bar and \lbrack H'\rbrack= 1 M (2) P(H2)= 1 bar and \lbrack H^+\rbrack 2M (3) P(H2)= 2 bar and \lbrack H^+\rbrack= 1 M (4) P(H2)= 2 bar and \lbrack H\ast\rbrack= 2 M

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Certain neutron stars are believed to be rotating at about 1 rec/sec. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be

1 joule of energy is to be converted into new system of units in which lenght is measured in 10metre, mass in 10kg and time in 1minute. The numerical value of 1 J in the new system is?

If y=y(x) is an implicit function of x such that loge(x+y)=4xy, then d2ydx2 at x=0 is equal to

If an object subtend angle of 2∘ at eye when seen through telescope having objective and eyepiece of focal length f0=60cm and fe=5cm respectively then angle subtend by image at eye piece will be

spring A has a spring constabt double of B.when a and b are streched by appluing equal force,the find energy stored in b if the ebergy stored in a is

ntThe centre of a wheel rolling on a plane surface moves with a speed v.A particle on the rim of the wheel at the same level as the centre will be moving at speedn nta)zeron ntb)vn ntc)square root of vn ntd)2vn

A circular disc of radius 100 mm and mass 1 kg, initially at rest at position A, rolls without slipping down a curved path as shown in figure. The speed v of the disc when it reaches position B isms.Acceleration due to gravity, g=ms2.

An object is thrown with velocity u, vertically upward. Its acceleration-time graph is:

(i) Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other. (ii) Which stoichiometric defect does not change the density of the crystal?

A body executes simple harmonic motion under the action of a force F1 with a time period (4/5) seconds. If the force is changed to F2, it executes SHM with time period (3/5) seconds. If both the forces F1 and F2 act simultaneously in the same direction on the body, its time period (in seconds) is

A circular wire frame is made of four uniform quarter circular wires of same radius and of mass per unit length λ,2λ,3λ and 4λ as shown in figure. Assuming the origin to be at the centre of the circle, which of the following options is (are) correct?

32. A particle is projected vertically up with velocity v=\sqrt{}4gRe/3 from earth surface .the velocity of particle at height equal to half of the maximum height reached by it??

In the Young’s double slit experiment apparatus shown in figure, the ratio of maximum to minimum intensity on the screen is 9. The wavelength of light used is λ, then the value of y is

Two identical charges are placed 3m apar in air experiences a Coulomb's force of 9*10 N. The magnitude of charge is

Why doesn't the light from the moon coming to us undergo dispersion while the sun's light undergoes dispersion and seems yellowish?

A metal vessel of negligible heat capacity contains 0.5 kg of water (of specific heat capacity 4200 J kg−1K−1). It is heated from 15∘C to 85∘C by a 750 W immersion heater in 4 minutes. The average loss of heat in watts to the surroundings, from the vessel during this time, is nearly:

Which of the following relation is true for the specific heat capacity of substance?

32.Consider an electric field E=E (nought) in +x direction. Find the flux through the shaded area due to this field.

4. linear acceleration of cylinder of mass M2 is a2 then angular acceleration α 2 is(given that there is no slipping) (a) a2/R (b) (a2+g)/R (c) 2(a2+g)/R (d) none of these

Question 4Which is a thermosetting plastic?(a) Melamine(b) Polythene(c) PVC(d) Nylon

53.Ratio of acceleration of block A(10kg) placed on smooth incline, with block B(20kg) placed on rough incline is 2:1. Find coefficient of kinetic friction between block B and incline.

A parallel beam of light is incident from air at an angle α on the side PQ of a right-angled triangular prism of refractive index n=√2. Light undergoes total internal reflection in the prism at the face PR when α has minimum value of 45∘. The angle θ of the prism is

A wire of length L and cross-sectional area A is made of a material of Young's modulus Y. If the wire is stretched by an amount x, the work done during the stretching is

A conducting ring of mass 2 kg and radius 0.5 m is placed on a smooth horizontal plane. The ring carries a current of i=4 A. A horizontal magnetic field B=10 T is switched on at time t=0 as shown in figure. The initial angular acceleration of the ring will be:

8. The distance traveled by a body starting from restand travelling with uniform acceleration, insuccessive intervals of time of equal duration will bein the ratio

A compound alloy of gold and copper crystallises in a cubic lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. What is the formula of this alloy compound?

The P-V diagram of 2 gm of helium gas for a certain process A → B is shown in the figure. what is the heat given to the gas during the process A → B

A discrete-time LTI system with the property such that if the input is x(n)=(12)nu(n)−14(12)n−1u(n−1)and output y(n)=(13)nu(n)The impulse response of the system is

for a particle moving on circle of radius 2m the dis†an ce as fn of time is s=tsqaure the acceleration at t=2 sec i

The ratio of radii of two wires of the same material is 2:1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be

Lightincident normally on a plane mirror attached to a galvanometer coilretraces backwards as shown in Fig. 9.36. A current in the coilproduces a deflection of 3.5°of the mirror. What is the displacement of the reflected spot oflight on a screen placed 1.5 m away?

If gravitational potential at surface of earth is v then Fing gravitational potential at a height equal to half of the radius of the earth

According to the classical wave picture of light, how would the current versus potential (between the plates) graph vary upon varying intensity?

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

A solid sphere falls with a terminal velocity of 20 m s-1 in air. If it is allowed to fall in vacuum,

A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newton. What is the reading of the machine when the lift is stationary? Take g=9.8 ms−2

An electric ﬁeld of 1500 Vm−1 and a magnetic ﬁeld of 0.4 Wb/m2 act on a moving electron. The minimum uniform speed along a straight line the electron could have so that it doesnot deviate from its path is

The variation of current and voltage in a conductor has been shown in figure. The conductance of the conductor is (Give your answer in Ω−1).

if the error in measurement of momentum of a particle is 10% and masses on exactly the permissible error in determination of kinetic energy

A particle is projected with speed v0 at an angle theta from horizontal the average velocity of particle

iIf the unit of force is kN ,the length is 1 km and time 100s ,then what will be the unit of mass ?

A balloon of diameter 20m Weighs 100kg. Calculate its payload if it is filled with helium at 1.0 atm and 27∘. Density of air is 1.2 Kgm−3 (R = 0.082 dm3 atm K−1mole−1)

Sir I have a dout on what are electron cloud.🙏

A uniform cube is subjected to volume compression. If each side is decreased by 1%, then bulk strain is

2The reduction potential of hydrogen half cell will be negative if(1) P(H2) =1 bar and \lbrack H'\rbrack= 1 M (2) P(H2)= 1 bar and \lbrack H^+\rbrack 2M (3) P(H2)= 2 bar and \lbrack H^+\rbrack= 1 M (4) P(H2)= 2 bar and \lbrack H\ast\rbrack= 2 M