50278 + Interview Questions in Physics

1.	An aircraft traveling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’?
Answer» An aircraft traveling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’?

Discussion

2.	If A = 60° and B = 30° verify that sin( A-B ) = sinA cosB - cosA sin B.
Answer» If A = 60° and B = 30° verify that sin( A-B ) = sinA cosB - cosA sin B.

Discussion

3.	Force(F) - time(t) graph is given below. Calculate the impulse experienced by the body.
Answer» Force $(F)$ - time $(t)$ graph is given below. Calculate the impulse experienced by the body.

Discussion

4.	A cart filled with sand of mass m0=50 kg is moving with constant velocity because of a constant force F=10 N acting in the direction of the cart's velocity vector. Sand starts spilling through a hole in the bottom with a constant velocity at the rate of μ=10 kg/s.. Find the velocity of the cart at the time t=4 s. Friction is to be neglected. [Take ln(5)= 1.61]
Answer» A cart filled with sand of mass $m_{0} = 50 kg$ is moving with constant velocity because of a constant force $F = 10 N$ acting in the direction of the cart's velocity vector. Sand starts spilling through a hole in the bottom with a constant velocity at the rate of $μ = 10 kg/s$ .. Find the velocity of the cart at the time $t = 4 s$ . Friction is to be neglected. [Take $ln (5) = 1.61$ ]

Discussion

5.	A 10 cm long perfectly conducting wire PQ is moving with a velocity 1 cm/s on a pair of horizontal rails of zero resistance. One side of the rails is connected to an inductor L=1 mH and a resistance R=1Ω as shown in figure. The horizontal rail, L and R lie in the same plane with a uniform magnetic field B=1 T perpendicular to the plane. If the key S is closed at certain instant , the current in the circuit after 1 millisecond is x×10−3 A, where the value of x is .[Assume the velocity of wire PQ remains constant (1 cm/s) after key S is closed. Given : e−1=0.37, where e is base of the natural logarithm]
Answer» A $10 c m$ long perfectly conducting wire PQ is moving with a velocity $1 c m / s$ on a pair of horizontal rails of zero resistance. One side of the rails is connected to an inductor $L = 1 m H$ and a resistance $R = 1 Ω$ as shown in figure. The horizontal rail, L and R lie in the same plane with a uniform magnetic field $B = 1 T$ perpendicular to the plane. If the key $S$ is closed at certain instant , the current in the circuit after 1 millisecond is $x \times 10^{- 3} A$ , where the value of $x$ is . [Assume the velocity of wire PQ remains constant $(1 c m / s)$ after key S is closed. Given : $e^{- 1} = 0.37$ , where e is base of the natural logarithm]

Discussion

6.	Which of the following law's gives the direction of induced emf?
Answer» Which of the following law's gives the direction of induced emf?

Discussion

7.	What are transverse waves?
Answer» What are transverse waves?

Discussion

8.	The magnetic flux linked with a coil is given by ϕ(t)=(2t2+3t+1) Wb. The charge that flows through the coil in time duration t=1 s to t=4 s will be (the resistance of the coil is equal to 4Ω) [0.77 Mark]
Answer» The magnetic flux linked with a coil is given by $ϕ (t) = (2 t^{2} + 3 t + 1) Wb .$ The charge that flows through the coil in time duration $t = 1 s$ to $t = 4 s$ will be (the resistance of the coil is equal to $4 Ω$ ) $[$ 0.77 Mark $]$

Discussion

9.	Vapour pressure of water is 360mm of hg .How much urea should be added to 200 mL of water to reduce its vapour pressure by 0.5%?
Answer» Vapour pressure of water is 360mm of hg .How much urea should be added to 200 mL of water to reduce its vapour pressure by 0.5%?

Discussion

10.	A spherical body of radius b=4π m has a concentric cavity of radius a=2π m as shown in the figure. Thermal conductivity of the material is 100 W/m∘C. If temperature of inner surface is kept at 70∘C and of the outer surface at 30∘C, then find the rate of heat flow. (in kW)
Answer» A spherical body of radius $b = \frac{4}{π}$ $m$ has a concentric cavity of radius $a = \frac{2}{π}$ $m$ as shown in the figure. Thermal conductivity of the material is $100 {W/m}^{\circ} C$ . If temperature of inner surface is kept at $70^{\circ} C$ and of the outer surface at $30^{\circ} C$ , then find the rate of heat flow. (in $kW$ )

Discussion

11.	If a beam consisting of α,β and γ radiation is passed through an electric field perpendicular to the beam, the deflections suffered by the components in decreasing order are
Answer» If a beam consisting of $α, β$ and $γ$ radiation is passed through an electric field perpendicular to the beam, the deflections suffered by the components in decreasing order are

Discussion

12.	4 How to find out hybridisation of Cl in ClO2 (neutral charge)??
Answer» 4 How to find out hybridisation of Cl in ClO2 (neutral charge)??

Discussion

13.	45.the moon revolves around the earth 13 times in one year .if the ratio of sun-earth distance to earth moon distance is 392,then the ratio of the masses of sun and earth will be
Answer» 45.the moon revolves around the earth 13 times in one year .if the ratio of sun-earth distance to earth moon distance is 392,then the ratio of the masses of sun and earth will be

Discussion

14.	Consider a rectangular tank of size (l×b) filled with a liquid of density ρ, to a height H, as shown in the figure. Find the ratio of the force acting on the base to that on the walls of the tank.
Answer» Consider a rectangular tank of size $(l \times b)$ filled with a liquid of density $ρ$ , to a height $H$ , as shown in the figure. Find the ratio of the force acting on the base to that on the walls of the tank.

Discussion

15.	In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5×10−12 m, the minimum electron energy required is close to
Answer» In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of $7.5 \times 10^{- 12} m$ , the minimum electron energy required is close to

Discussion

16.	A block kept on a rough inclined plane, as shown in the figure remains at rest upto a maximum force 2 N down the inclined plane. The maximum external force up the inclined plane that does not move the block is 10 N. The coefficient of static friction between the block and the plane is (Take g=10 m/s2)
Answer» A block kept on a rough inclined plane, as shown in the figure remains at rest upto a maximum force $2 N$ down the inclined plane. The maximum external force up the inclined plane that does not move the block is $10 N$ . The coefficient of static friction between the block and the plane is (Take $g = 10 m / s^{2})$

Discussion

17.	how does inert gas effect the equilibrium?
Answer» how does inert gas effect the equilibrium?

Discussion

18.	Prove that sin3x+sin2x−sinx=4sinxcosx2cos3x2
Answer» Prove that $sin 3 x + sin 2 x - sin x = 4 sin x cos \frac{x}{2} cos \frac{3 x}{2}$

Discussion

19.	37.Q1. The horizontal acceleration that should be given to a smooth incline plane of inclination cos-(1/2) to keep an object stationary on the plane relative to it is. Q2. A rifle bullet losses 1/Nth of its velocity in passing through a Planck. The minimum number of such identical plancks required to just stop the bullet is.
Answer» 37.Q1. The horizontal acceleration that should be given to a smooth incline plane of inclination cos-(1/2) to keep an object stationary on the plane relative to it is. Q2. A rifle bullet losses 1/Nth of its velocity in passing through a Planck. The minimum number of such identical plancks required to just stop the bullet is.

Discussion

20.	Consider two point masses m and 2m ata distance of 3m in a gravity free space. Find the maximum possible velocity v which can be given to 2m so that 2m and m revolve in a closed orbit due to their mutual gravitation force of attraction.
Answer» Consider two point masses m and 2m ata distance of 3m in a gravity free space. Find the maximum possible velocity v which can be given to 2m so that 2m and m revolve in a closed orbit due to their mutual gravitation force of attraction.

Discussion

21.	Two narrow bores of diameters 3 mm and 6 mm are joined together to form a u-shaped tube open at both ends. If the u - tube contains water, the difference in it's level of water in the two limbs will be (Take surface tension of water =7.3×10−2 N/m, angle of contact =0∘ and density of water = 1000 kg/m3)
Answer» Two narrow bores of diameters $3 mm$ and $6 mm$ are joined together to form a $u-shaped$ tube open at both ends. If the u - tube contains water, the difference in it's level of water in the two limbs will be $($ Take surface tension of water $= 7.3 \times 10^{- 2} N/m$ , angle of contact $= 0^{\circ}$ and density of water = $1000 {kg/m}^{3})$

Discussion

22.	A ball of mass 0.1 Kg. is whirled in a horizontal circle of radius 1 m. by means of a string at an initial speed of 10 R.P.M. Keeping the radius constant, the tension in the string is reduced to one quarter of its initial value. The new speed is
Answer» A ball of mass 0.1 Kg. is whirled in a horizontal circle of radius 1 m. by means of a string at an initial speed of 10 R.P.M. Keeping the radius constant, the tension in the string is reduced to one quarter of its initial value. The new speed is

Discussion

23.	A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.
Answer» A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.

23.

A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.

Answer»

A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.

Discussion

24.	a force F is applied on a square area of side L. if the percentage error in the measurement of L 2% and that in F is 4% what is the maximum percentage error in pressure
Answer» a force F is applied on a square area of side L. if the percentage error in the measurement of L 2% and that in F is 4% what is the maximum percentage error in pressure

Discussion

25.	Calculate the energy of 0.5 mole of photons of light having frequency 5*10^14 Hz.
Answer» Calculate the energy of 0.5 mole of photons of light having frequency 5*10^14 Hz.

Discussion

26.	105.Three equal resistors connected in series across a source of EMF together dissipate 10 W of power.what would be the power dissipated if same resistors are connected in parallel across the same source of EMF?
Answer» 105.Three equal resistors connected in series across a source of EMF together dissipate 10 W of power.what would be the power dissipated if same resistors are connected in parallel across the same source of EMF?

Discussion

27.	if a satellite of mass 400 kg reolves around the earth in an orbit with with speed 200m/s then its potential energy is
Answer» if a satellite of mass 400 kg reolves around the earth in an orbit with with speed 200m/s then its potential energy is

Discussion

28.	Find the acceleration of each Block?
Answer» Find the acceleration of each Block?

Discussion

29.	The shortest distance between the lines whose equations are →r=⟨3,5,7⟩+λ⟨1,2,3⟩ and →r=⟨−1,−1,3⟩+μ⟨7,−6,3⟩ is:
Answer» The shortest distance between the lines whose equations are $\to r = ⟨ 3, 5, 7 ⟩ + λ ⟨ 1, 2, 3 ⟩$ and $\to r = ⟨ - 1, - 1, 3 ⟩ + μ ⟨ 7, - 6, 3 ⟩$ is:

Discussion

30.	A flexible wire is bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes with time as shown in figure. The graph of induced emf versus time in the coil is represented by
Answer» A flexible wire is bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes with time as shown in figure. The graph of induced emf versus time in the coil is represented by

Discussion

31.	the acceleration of particle is a function of position is given by a(x)=4-2x ms^{-2}. then velocity v(x) is equal to
Answer» the acceleration of particle is a function of position is given by a(x)=4-2x ms^{-2}. then velocity v(x) is equal to

Discussion

32.	Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that
Answer» Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

32.

Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

Answer»

Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

Discussion

33.	An α−particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de-Broglie wavelengths are λαand λp respectively. The ratio λpλα , to the nearest integer, is
Answer» An $α -$ particle and a proton are accelerated from rest by a potential difference of $100 V$ . After this, their de-Broglie wavelengths are $λ_{α}$ and $λ_{p}$ respectively. The ratio $\frac{λ_{p}}{λ_{α}}$ , to the nearest integer, is

Discussion

34.	Assume that a body is displaced from −→rA=(2 m,4 m,−6 m) to −→rB=(6^i−4^j+2^k) m, under a constant force →F=(2^i+3^j−^k) N. Calculate work done by the force.
Answer» Assume that a body is displaced from $_{A} = (2 m, 4 m, - 6 m)$ to $_{B} = (6^i - 4^j + 2^k) m$ , under a constant force $\to F = (2^i + 3^j -^k) N$ . Calculate work done by the force.

Discussion

35.	A trolley filled with sand moves on a smooth horizontal surface with a velocity V0 . A small hole is made at the base of it from which sand is leaving out vertically down at constant rate. As the sand leaves out As the sand leaves out a. the velocity of the trolley remains constant b. the velocity of the trolley increases c. the velocity of the trolley decreases d. the momentumof trolley + leakedout sand is conserved
Answer» A trolley filled with sand moves on a smooth horizontal surface with a velocity V0 . A small hole is made at the base of it from which sand is leaving out vertically down at constant rate. As the sand leaves out As the sand leaves out a. the velocity of the trolley remains constant b. the velocity of the trolley increases c. the velocity of the trolley decreases d. the momentumof trolley + leakedout sand is conserved

35.

A trolley filled with sand moves on a smooth horizontal surface with a velocity V0 . A small hole is made at the base of it from which sand is leaving out vertically down at constant rate. As the sand leaves out As the sand leaves out a. the velocity of the trolley remains constant b. the velocity of the trolley increases c. the velocity of the trolley decreases d. the momentumof trolley + leakedout sand is conserved

Answer»

A trolley filled with sand moves on a smooth horizontal surface with a velocity V0 . A small hole is made at the base of it from which sand is leaving out vertically down at constant rate. As the sand leaves out

As the sand leaves out

a. the velocity of the trolley remains constant

b. the velocity of the trolley increases

c. the velocity of the trolley decreases

d. the momentumof trolley + leakedout sand is conserved

Discussion

36.	A long solenoid of 100 cm length, having 200 turns, carries 5 A current. The magnetic field at one end of the solenoid is(μ0=4π×10−7 Tm/A)
Answer» A long solenoid of $100 cm$ length, having $200$ turns, carries $5 A$ current. The magnetic field at one end of the solenoid is $(μ_{0} = 4 π \times 10^{- 7} Tm/A)$

Discussion

37.	61.Two metal spheres of radii and B are connected by a thin wire their separation is very large compared to there are dimensions the capacitance of this system is
Answer» 61.Two metal spheres of radii and B are connected by a thin wire their separation is very large compared to there are dimensions the capacitance of this system is

Discussion

38.	Suraj can open a 2 m wide door by applying a force of 2.5 N at the free end of the door. Find the moment of force needed to open the door.
Answer» Suraj can open a $2 m$ wide door by applying a force of $2.5 N$ at the free end of the door. Find the moment of force needed to open the door.

Discussion

39.	A uniform bar of length L; cross-section area A and Young’s modulus Y is acted upon by forces as shown. If elongation in the bar is NLAY; then N is ___.
Answer» A uniform bar of length L; cross-section area A and Young’s modulus Y is acted upon by forces as shown. If elongation in the bar is $\frac{NL}{AY}$ ; then N is ___.

39.

A uniform bar of length L; cross-section area A and Young’s modulus Y is acted upon by forces as shown. If elongation in the bar is NLAY; then N is ___.

Answer»

A uniform bar of length L; cross-section area A and Young’s modulus Y is acted upon by forces as shown. If elongation in the bar is $\frac{NL}{AY}$ ; then N is ___.

Discussion

40.	the change in surface energy when a drop of radius R splits up into 1000 droplets each of radius r is (surface Tension is T)
Answer» the change in surface energy when a drop of radius R splits up into 1000 droplets each of radius r is (surface Tension is T)

Discussion

41.	The function rule that relate the given function's input and output is .
Answer» The function rule that relate the given function's input and output is .

Discussion

42.	four thin rod each of mass m and length l are joined to make a square find the momentem of interia af all. the four rods about any side a square
Answer» four thin rod each of mass m and length l are joined to make a square find the momentem of interia af all. the four rods about any side a square

Discussion

43.	Total pressure of a gaseous mixture containing 28 g N2 and 16 g O2 in a cylinder of volume 8.21 L at 300 K is:[Given: R=0.0821 L atm mol−1K−1]
Answer» Total pressure of a gaseous mixture containing $28 g N_{2}$ and $16 g O_{2}$ in a cylinder of volume $8.21 L$ at $300 K$ is: [Given: $R = 0.0821 {L atm mol}^{- 1} K^{- 1}$ ]

Discussion

44.	Figure shows a rod of length 20 cm pivoted near an end and which is made to rotate in a horizontal plane with a constant angular spped. A ball of mass m is suspended by a string also of length 20 cm from the other end of the rod . If the angle θ made by the string with the vertical is 30∘, find the angular speed of rotation. Take g=10 m/s2
Answer» Figure shows a rod of length $20 cm$ pivoted near an end and which is made to rotate in a horizontal plane with a constant angular spped. A ball of mass $m$ is suspended by a string also of length $20 cm$ from the other end of the rod . If the angle $θ$ made by the string with the vertical is $30^{\circ}$ , find the angular speed of rotation. Take $g = 10 {m/s}^{2}$

Discussion

45.	1. Two blocks of masses m1 and m2 are lying on a smooth inclined surface and connected by a light inextensible string as shown in fig. If the system is pulled by a force F, the tension in the string will be
Answer» 1. Two blocks of masses m1 and m2 are lying on a smooth inclined surface and connected by a light inextensible string as shown in fig. If the system is pulled by a force F, the tension in the string will be

Discussion

46.	A metal whose work function is 3.3 eV is illuminated by light of wavelength 3×10−7 m. What is the threshold frequency for photoelectric emission? Given Planck's constant =6.6×10−34 Js.
Answer» A metal whose work function is $3.3 e V$ is illuminated by light of wavelength $3 \times 10^{- 7}$ m. What is the threshold frequency for photoelectric emission? Given Planck's constant $= 6.6 \times 10^{- 34} J s$ .

Discussion

47.	The magnetic flux through a stationary loop with resistance R varies during an interval of time T as ϕ=at(T−t). The heat generated during this time neglecting the inductance of the loop will be
Answer» The magnetic flux through a stationary loop with resistance $R$ varies during an interval of time $T$ as $ϕ = a t (T - t)$ . The heat generated during this time neglecting the inductance of the loop will be

Discussion

48.	In the given circuit, the AC source has angular frequency ω=100 rad s−1. Considering the inductor and capacitor to be ideal, what will be the current I flowing through the circuit ?
Answer» In the given circuit, the AC source has angular frequency $ω = 100 {rad s}^{- 1}$ . Considering the inductor and capacitor to be ideal, what will be the current $I$ flowing through the circuit ?

Discussion

49.	A gun fires 10 bullets/sec each of mass 10 gm, with a muzzle velocity of 50 m/s. Find the force required to hold the gun in position.
Answer» A gun fires $10$ bullets/sec each of mass $10 g m$ , with a muzzle velocity of $50 m / s$ . Find the force required to hold the gun in position.

Discussion

50.	The entropy changes when 1 mole of ideal gas at 27°C is expanded reversibly from 2 litres to 20 litres is(1) 2 cal K^-1 mol^-1(2) 4.6 cal K^-1 mol^-1(3) 4 J K^-1 mol^-1(4) 4.6 kJ K^-1 mol^-1
Answer» The entropy changes when 1 mole of ideal gas at 27°C is expanded reversibly from 2 litres to 20 litres is (1) 2 cal K^-1 mol^-1 (2) 4.6 cal K^-1 mol^-1 (3) 4 J K^-1 mol^-1 (4) 4.6 kJ K^-1 mol^-1

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An aircraft traveling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’?

If A = 60° and B = 30° verify that sin( A-B ) = sinA cosB - cosA sin B.

Force(F) - time(t) graph is given below. Calculate the impulse experienced by the body.

Which of the following law's gives the direction of induced emf?

What are transverse waves?

The magnetic flux linked with a coil is given by ϕ(t)=(2t2+3t+1) Wb. The charge that flows through the coil in time duration t=1 s to t=4 s will be (the resistance of the coil is equal to 4Ω) [0.77 Mark]

Vapour pressure of water is 360mm of hg .How much urea should be added to 200 mL of water to reduce its vapour pressure by 0.5%?

A spherical body of radius b=4π m has a concentric cavity of radius a=2π m as shown in the figure. Thermal conductivity of the material is 100 W/m∘C. If temperature of inner surface is kept at 70∘C and of the outer surface at 30∘C, then find the rate of heat flow. (in kW)

If a beam consisting of α,β and γ radiation is passed through an electric field perpendicular to the beam, the deflections suffered by the components in decreasing order are

4 How to find out hybridisation of Cl in ClO2 (neutral charge)??

45.the moon revolves around the earth 13 times in one year .if the ratio of sun-earth distance to earth moon distance is 392,then the ratio of the masses of sun and earth will be

Consider a rectangular tank of size (l×b) filled with a liquid of density ρ, to a height H, as shown in the figure. Find the ratio of the force acting on the base to that on the walls of the tank.

In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5×10−12 m, the minimum electron energy required is close to

how does inert gas effect the equilibrium?

Prove that sin3x+sin2x−sinx=4sinxcosx2cos3x2

Consider two point masses m and 2m ata distance of 3m in a gravity free space. Find the maximum possible velocity v which can be given to 2m so that 2m and m revolve in a closed orbit due to their mutual gravitation force of attraction.

A ball of mass 0.1 Kg. is whirled in a horizontal circle of radius 1 m. by means of a string at an initial speed of 10 R.P.M. Keeping the radius constant, the tension in the string is reduced to one quarter of its initial value. The new speed is

A point object is placed 20 cm left of a convex lens of focal length f = 5 cm (see the figure). The lens is made to oscillate with small amplitude A along the horizontal axis. The image of the object will also oscillate along the axis with.

a force F is applied on a square area of side L. if the percentage error in the measurement of L 2% and that in F is 4% what is the maximum percentage error in pressure

Calculate the energy of 0.5 mole of photons of light having frequency 5*10^14 Hz.

105.Three equal resistors connected in series across a source of EMF together dissipate 10 W of power.what would be the power dissipated if same resistors are connected in parallel across the same source of EMF?

if a satellite of mass 400 kg reolves around the earth in an orbit with with speed 200m/s then its potential energy is

Find the acceleration of each Block?

The shortest distance between the lines whose equations are →r=⟨3,5,7⟩+λ⟨1,2,3⟩ and →r=⟨−1,−1,3⟩+μ⟨7,−6,3⟩ is:

A flexible wire is bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes with time as shown in figure. The graph of induced emf versus time in the coil is represented by

the acceleration of particle is a function of position is given by a(x)=4-2x ms^{-2}. then velocity v(x) is equal to

Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

An α−particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de-Broglie wavelengths are λαand λp respectively. The ratio λpλα , to the nearest integer, is

Assume that a body is displaced from −→rA=(2 m,4 m,−6 m) to −→rB=(6^i−4^j+2^k) m, under a constant force →F=(2^i+3^j−^k) N. Calculate work done by the force.

A long solenoid of 100 cm length, having 200 turns, carries 5 A current. The magnetic field at one end of the solenoid is(μ0=4π×10−7 Tm/A)

61.Two metal spheres of radii and B are connected by a thin wire their separation is very large compared to there are dimensions the capacitance of this system is

Suraj can open a 2 m wide door by applying a force of 2.5 N at the free end of the door. Find the moment of force needed to open the door.

A uniform bar of length L; cross-section area A and Young’s modulus Y is acted upon by forces as shown. If elongation in the bar is NLAY; then N is ___.

the change in surface energy when a drop of radius R splits up into 1000 droplets each of radius r is (surface Tension is T)

The function rule that relate the given function's input and output is .

four thin rod each of mass m and length l are joined to make a square find the momentem of interia af all. the four rods about any side a square

Total pressure of a gaseous mixture containing 28 g N2 and 16 g O2 in a cylinder of volume 8.21 L at 300 K is:[Given: R=0.0821 L atm mol−1K−1]

1. Two blocks of masses m1 and m2 are lying on a smooth inclined surface and connected by a light inextensible string as shown in fig. If the system is pulled by a force F, the tension in the string will be

A metal whose work function is 3.3 eV is illuminated by light of wavelength 3×10−7 m. What is the threshold frequency for photoelectric emission? Given Planck's constant =6.6×10−34 Js.

The magnetic flux through a stationary loop with resistance R varies during an interval of time T as ϕ=at(T−t). The heat generated during this time neglecting the inductance of the loop will be

In the given circuit, the AC source has angular frequency ω=100 rad s−1. Considering the inductor and capacitor to be ideal, what will be the current I flowing through the circuit ?

A gun fires 10 bullets/sec each of mass 10 gm, with a muzzle velocity of 50 m/s. Find the force required to hold the gun in position.

The entropy changes when 1 mole of ideal gas at 27°C is expanded reversibly from 2 litres to 20 litres is(1) 2 cal K^-1 mol^-1(2) 4.6 cal K^-1 mol^-1(3) 4 J K^-1 mol^-1(4) 4.6 kJ K^-1 mol^-1