50278 + Interview Questions in Physics

1.	Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions.
Answer» Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions.

1.

Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions.

Answer»

Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions.

2.	5. if identical charges (-q) are placed at each corner of a cube of side B, then electric potential of charge (+q) which is placed at centre of the cube will be A. 82q/4^° b B. 82q/^° b C. -42q/^° b D. -4q/3^° b
Answer» 5. if identical charges (-q) are placed at each corner of a cube of side B, then electric potential of charge (+q) which is placed at centre of the cube will be A. 82q/4^° b B. 82q/^° b C. -42q/^° b D. -4q/3^° b

Discussion

3.	An electron accelerated by a potential difference V enters a uniform magnetic field of flux density B at right angles to the field. It describes a circular path of radius r. If V and B are doubled, then the radius of the new circular path is
Answer» An electron accelerated by a potential difference $V$ enters a uniform magnetic field of flux density $B$ at right angles to the field. It describes a circular path of radius $r$ . If $V$ and $B$ are doubled, then the radius of the new circular path is

Discussion

4.	Draw E-r and V - r graphs due to two point charges +q and -2qkept at some distance along the line joining these two charges.
Answer» Draw E-r and V - r graphs due to two point charges +q and -2qkept at some distance along the line joining these two charges.

Discussion

5.	A block of mass m=15 kg is attached to a spring of stiffness K=100 N/m. The block descends a plane inclined at an angle α=30∘ with horizontal. Assuming there is no friction, determine the acceleration of the block when the spring has stretched by a length x=0.05 m. (Acceleration due to gravity is 10 m/s2)
Answer» A block of mass $m = 15 kg$ is attached to a spring of stiffness $K = 100 N/m$ . The block descends a plane inclined at an angle $α = 30^{\circ}$ with horizontal. Assuming there is no friction, determine the acceleration of the block when the spring has stretched by a length $x = 0.05 m$ . (Acceleration due to gravity is $10 {m/s}^{2}$ )

Discussion

6.	Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have
Answer» Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have

Discussion

7.	Two rods of lengths l1 and l2 are made of materials whose coefficients of linear expansion are α1 and α2. If the difference between the two lengths is independent of temperature, then
Answer» Two rods of lengths $l_{1}$ and $l_{2}$ are made of materials whose coefficients of linear expansion are $α_{1}$ and $α_{2}$ . If the difference between the two lengths is independent of temperature, then

Discussion

8.	An infinite long straight conducting cylindrical shell of radius a is surrounded by a thin coaxial infinite conducting cylindrical shell of radius b. Assuming current flows uniformly through the cylindrical shell and returns through the outer shell, the inductance per unit length for this arrangement is
Answer» An infinite long straight conducting cylindrical shell of radius a is surrounded by a thin coaxial infinite conducting cylindrical shell of radius b. Assuming current flows uniformly through the cylindrical shell and returns through the outer shell, the inductance per unit length for this arrangement is

Discussion

9.	A non-conducting spherical ball of radius R contains a spherically symmetric charge with volume charge density ρ=krn, where r is the distance from the centre of the ball and n is a constant. What should be n such that the electric field inside the ball is directly proportional to the square of distance from the centre?
Answer» A non-conducting spherical ball of radius $R$ contains a spherically symmetric charge with volume charge density $ρ = k r^{n}$ , where $r$ is the distance from the centre of the ball and $n$ is a constant. What should be $n$ such that the electric field inside the ball is directly proportional to the square of distance from the centre?

Discussion

10.	A cyclist riding the bicycle at a speed of 14√3ms−1 takes a turn around a circular road of radius 20√3 m without skidding. Given g=9.8ms−2, what is his inclination to the vertical
Answer» A cyclist riding the bicycle at a speed of $14 \sqrt{3} m s^{- 1}$ takes a turn around a circular road of radius $20 \sqrt{3}$ m without skidding. Given $g = 9.8 m s^{- 2}$ , what is his inclination to the vertical

10.

A cyclist riding the bicycle at a speed of 14√3ms−1 takes a turn around a circular road of radius 20√3 m without skidding. Given g=9.8ms−2, what is his inclination to the vertical

Answer»

A cyclist riding the bicycle at a speed of $14 \sqrt{3} m s^{- 1}$ takes a turn around a circular road of radius $20 \sqrt{3}$ m without skidding. Given $g = 9.8 m s^{- 2}$ , what is his inclination to the vertical

Discussion

11.	A force F acting on an object varies with distanceas shown here. The force is in N and x in m.The work done by the force in moving the objectfrom x 0 to x = 6 m is \lbrack AIPMT (Prelims)-2005\rbrack113-2t#1 2 3 4 5 67x in(m)(1) 4.5 J(2) 13.5 J(3) 9.0 J(4) 18.0 JF in (N)
Answer» A force F acting on an object varies with distanceas shown here. The force is in N and x in m.The work done by the force in moving the objectfrom x 0 to x = 6 m is \lbrack AIPMT (Prelims)-2005\rbrack113-2t#1 2 3 4 5 67x in(m)(1) 4.5 J(2) 13.5 J(3) 9.0 J(4) 18.0 JF in (N)

Discussion

12.	19.A thin glass (refractive index 1.5) lens has optical power of 5D in air. Its optical power in a liquid medium with refractive index 1.6 will be
Answer» 19.A thin glass (refractive index 1.5) lens has optical power of 5D in air. Its optical power in a liquid medium with refractive index 1.6 will be

Discussion

13.	ntThe de Broglie the de Broglie wavelength of an electron moving with velocity C/2(C= velocity of light in vaccum) is equal to the wavelength of a Photon. The ratio of kinetic energies of electron and Photon is:n nta. 1:4 b. 1:2 c. 4:1 d. 2:1n
Answer» ntThe de Broglie the de Broglie wavelength of an electron moving with velocity C/2(C= velocity of light in vaccum) is equal to the wavelength of a Photon. The ratio of kinetic energies of electron and Photon is:n nta. 1:4 b. 1:2 c. 4:1 d. 2:1n

Discussion

14.	electric potential at P,r dis†an ce away due to a point charge q at point A is V.If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius 4r with centre at point A,the potential at point P now is
Answer» electric potential at P,r dis†an ce away due to a point charge q at point A is V.If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius 4r with centre at point A,the potential at point P now is

Discussion

15.	For an isotropic material, the relationship between the young's modulus (E), shear modulus (G) and Poisson's ration (μ) is given by
Answer» For an isotropic material, the relationship between the young's modulus $(E)$ , shear modulus $(G)$ and Poisson's ration $(μ)$ is given by

Discussion

16.	82. Consider a system of two identical particles.one of the particle is at rest ant the other has an acceleration f. The centre of mass has an acceleration 1. Zero 2. f 3.f/2 4.2f
Answer» 82. Consider a system of two identical particles.one of the particle is at rest ant the other has an acceleration f. The centre of mass has an acceleration 1. Zero 2. f 3.f/2 4.2f

Discussion

17.	Which of the statement are true? 1) pressure exerted by the liquid depends upon depth of the liquid 2) pressure exerted by the liquid depends upon acceleration due to gravity
Answer» Which of the statement are true? 1) pressure exerted by the liquid depends upon depth of the liquid 2) pressure exerted by the liquid depends upon acceleration due to gravity

17.

Which of the statement are true? 1) pressure exerted by the liquid depends upon depth of the liquid 2) pressure exerted by the liquid depends upon acceleration due to gravity

Answer»

Which of the statement are true?

1) pressure exerted by the liquid depends upon depth of the liquid

2) pressure exerted by the liquid depends upon acceleration due to gravity

Discussion

18.

Five identical capacitor plates, each of area A, are arranged such that adjacent plates are at d distance apart, Plates are connected to a source of e.m.f E as shown in the figure. Match the following Column-I Column-II (A) Charge on plate 1(P)−ε0AEd(B) Charge on plate 4(Q)+ε0AEd(C) Potential difference between plates 1 and 2(R) Zero(D) Potential difference between plates 1 and 5(S) E

Answer»

Five identical capacitor plates, each of area $A$ , are arranged such that adjacent plates are at $d$ distance apart, Plates are connected to a source of e.m.f $E$ as shown in the figure. Match the following

Column-I
Column-II

$(A) Charge on plate 1$	$(P) \frac{- ε_{0} A E}{d}$
$(B) Charge on plate 4$	$(Q) \frac{+ ε_{0} A E}{d}$
$(C) Potential difference between plates 1 and 2$	$(R) Zero$
$(D) Potential difference between plates 1 and 5$	$(S) E$

Discussion

19.	A source of sound emitting a 1200 Hz note , travels along a straight line at a speed of 170 m/s. A detector is placed at a distance of 200 m from the line of motion of the source. Frequency of sound received by the detector at the instant when the source gets closest to it will be [velocity of sound in air =340 m/s][Assume, medium is stationary]
Answer» A source of sound emitting a $1200 Hz$ note , travels along a straight line at a speed of $170 m/s$ . A detector is placed at a distance of $200 m$ from the line of motion of the source. Frequency of sound received by the detector at the instant when the source gets closest to it will be [velocity of sound in air $= 340 m/s]$ [Assume, medium is stationary]

Discussion

20.	Four particles A, B, C and D having masses m, 2m, 3m and 4m respectively are placed in order at the corners of a square of side a. Locate the centre of mass
Answer» Four particles $A$ , $B$ , $C$ and $D$ having masses $m$ , $2 m$ , $3 m$ and $4 m$ respectively are placed in order at the corners of a square of side $a$ . Locate the centre of mass

20.

Four particles A, B, C and D having masses m, 2m, 3m and 4m respectively are placed in order at the corners of a square of side a. Locate the centre of mass

Answer»

Four particles $A$ , $B$ , $C$ and $D$ having masses $m$ , $2 m$ , $3 m$ and $4 m$ respectively are placed in order at the corners of a square of side $a$ . Locate the centre of mass

Discussion

21.	55. Each of two large conducting parallel plates has one sided surface area A. If one of the plates is given a charge Q whereas the other is neutral, then the electric field at a point in between the plates is given by (in terms of Q, A and epsilon)
Answer» 55. Each of two large conducting parallel plates has one sided surface area A. If one of the plates is given a charge Q whereas the other is neutral, then the electric field at a point in between the plates is given by (in terms of Q, A and epsilon)

Discussion

22.	A particle of specific charge alpha (charge/mass) startmoving from origin under action of an electric fieldE Eoi and magnetic field B-Bok. Its velocity at(xo.Y0,0) is 4j +3j. The value of xo is
Answer» A particle of specific charge alpha (charge/mass) startmoving from origin under action of an electric fieldE Eoi and magnetic field B-Bok. Its velocity at(xo.Y0,0) is 4j +3j. The value of xo is

Discussion

23.	A hollow charged metal sphere has radius r . If the potential difference between its surface and a point at a distance 3r from the centre is V , then electric field intensity at a distance 3r is A) V/2r B) V/3r C) V/6r D) V/4r
Answer» A hollow charged metal sphere has radius r . If the potential difference between its surface and a point at a distance 3r from the centre is V , then electric field intensity at a distance 3r is A) V/2r B) V/3r C) V/6r D) V/4r

Discussion

24.	a body is projected from the centre of the earth in vertically upward direction inside a tunnel with speed vits velocity becomes 0 at a distance R/2 from surface of earth. Find the speed with which it was projected
Answer» a body is projected from the centre of the earth in vertically upward direction inside a tunnel with speed v its velocity becomes 0 at a distance R/2 from surface of earth. Find the speed with which it was projected

Discussion

25.	a b omb of mass 20 kg initially at rest explodes into three piceces of mass 10 kg,m1,m2. if tge heavier one remains at rest and move direction to each other with same speed of 10m/s. then find the ratio of 1 and m2
Answer» a b omb of mass 20 kg initially at rest explodes into three piceces of mass 10 kg,m1,m2. if tge heavier one remains at rest and move direction to each other with same speed of 10m/s. then find the ratio of 1 and m2

Discussion

26.	The length of the compound microscope is 18 cm. The magnifying power for the relaxed eye is 28, find the object distance from the objective lens, if the focal length of the eyepiece is 4 cm.
Answer» The length of the compound microscope is $18 cm$ . The magnifying power for the relaxed eye is $28$ , find the object distance from the objective lens, if the focal length of the eyepiece is $4 cm$ .

Discussion

27.	A planet is made of two materials of density ρ1 and ρ2 as shown in figure. If the acceleration due to gravity at the surface of planet is same as at depth R, the ratio ρ1ρ2 is equal to x3. Then the value of x is . Write upto two digits after the decimal point.
Answer» A planet is made of two materials of density $ρ_{1}$ and $ρ_{2}$ as shown in figure. If the acceleration due to gravity at the surface of planet is same as at depth $R$ , the ratio $\frac{ρ_{1}}{ρ_{2}}$ is equal to $\frac{x}{3}$ . Then the value of $x$ is . Write upto two digits after the decimal point.

Discussion

28.	Two spheres A and B have diameters in the ratio 1:2, densities in the ratio 2:1 and thermal capacities in the ratio 1:12. Find the ratio of their specific heat capacities.
Answer» Two spheres $A$ and $B$ have diameters in the ratio $1 : 2$ , densities in the ratio $2 : 1$ and thermal capacities in the ratio $1 : 12$ . Find the ratio of their specific heat capacities.

Discussion

29.	4 partiches of equal masses round a circle of radius r due to tneir mutual gravitational attraction .find angular velocity of ach particle
Answer» 4 partiches of equal masses round a circle of radius r due to tneir mutual gravitational attraction .find angular velocity of ach particle

Discussion

30.	50. What is the separation energy? What is the separation energy (in eV) for electron present in the first excited state of Be3+?
Answer» 50. What is the separation energy? What is the separation energy (in eV) for electron present in the first excited state of Be3+?

Discussion

31.	A body thrown up along a frictionless inclined plane of angle of inclination 30∘ covers a distance of 40 m along the plane. If the body id projected with the same speed at an angle of 30∘ with the ground, it will have a range of (Take g=10 ms−2)
Answer» A body thrown up along a frictionless inclined plane of angle of inclination $30^{\circ}$ covers a distance of 40 m along the plane. If the body id projected with the same speed at an angle of $30^{\circ}$ with the ground, it will have a range of $(T a k e g = 10 m s^{- 2})$

Discussion

32.	(a) For what kinetic energy of a neutron will the associated de Broglie wavelength be 1.40 × 10–10 m? (b) Also find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of (3/2) k T at 300 K.
Answer» (a) For what kinetic energy of a neutron will the associated de Broglie wavelength be 1.40 × 10–10 m? (b) Also find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of (3/2) k T at 300 K.

Discussion

33.	In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength l), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is[IIT-JEE (Screening) 2002]
Answer» In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength l), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is [IIT-JEE (Screening) 2002]

33.

In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength l), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is[IIT-JEE (Screening) 2002]

Answer»

In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength l), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is

[IIT-JEE (Screening) 2002]

Discussion

34.	Half ring of radius a is uniformly charged with linear charge density λ. Find out electric field intensity at point O.
Answer» Half ring of radius $a$ is uniformly charged with linear charge density $λ$ . Find out electric field intensity at point $O$ .

Discussion

35.	2 capacitors of capacitance C1 AND C2 r connected in parallel if a charge Q is given to combination the ratio of charge on capacitor C1 to the charge on C2 will be
Answer» 2 capacitors of capacitance C1 AND C2 r connected in parallel if a charge Q is given to combination the ratio of charge on capacitor C1 to the charge on C2 will be

Discussion

36.	A man of mass 60 kg runs up a flight of 30 steps in 40 seconds. If each step is 20 cm high, calculate the power of the man.
Answer» A man of mass 60 kg runs up a flight of 30 steps in 40 seconds. If each step is 20 cm high, calculate the power of the man.

Discussion

37.	Consider a discrete time signal x[n] whose discrete time Fourier transform is X(ejω) where X(ejω)=11−e−jω⎛⎜⎜⎝sin32ωsinω2⎞⎟⎟⎠+5πδ(ω);−π≤ω≤π Then the value of x[n] at n=3 is4
Answer» Consider a discrete time signal x[n] whose discrete time Fourier transform is $X (e^{j ω})$ where $X (e^{j ω}) = \frac{1}{1 - e^{- j ω}} ⎛ ⎜⎜ ⎝ \frac{s i n \frac{3}{2} ω}{s i n \frac{ω}{2}} ⎞ ⎟⎟ ⎠ + 5 π δ (ω); - π \leq ω \leq π$ Then the value of x[n] at n=3 is 4

Discussion

38.	A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are
Answer» A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are

Discussion

39.	Four positive charges (2√2−1)Q are arranged at the four corners of a square. Another charge q is placed at the centre of the square. Resulting field acting on each corner will be zero if q is
Answer» Four positive charges $(2 \sqrt{2} - 1) Q$ are arranged at the four corners of a square. Another charge $q$ is placed at the centre of the square. Resulting field acting on each corner will be zero if $q$ is

Discussion

40.	Find the period of oscillation of a simple pendulum of length L suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination Alpha.
Answer» Find the period of oscillation of a simple pendulum of length L suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination Alpha.

Discussion

41.	A weightless spring has a force constant k oscillates with frequency f when a mass m is suspended from it .The frequency of oscillations of one part will become
Answer» A weightless spring has a force constant k oscillates with frequency f when a mass m is suspended from it .The frequency of oscillations of one part will become

Discussion

42.	Two boys, first 52 inches tall and second 55 inches tall, are standing at the distances 4.0 m and 5.0 m respectively from an eye. Which boy will appear taller?
Answer» Two boys, first 52 inches tall and second 55 inches tall, are standing at the distances 4.0 m and 5.0 m respectively from an eye. Which boy will appear taller?

Discussion

43.	A point mass is executing simple harmonic motion with an amplitude of 10 mm and frequency of 4 Hz. The maximum acceleration (m/s2) of the mass is
Answer» A point mass is executing simple harmonic motion with an amplitude of 10 mm and frequency of 4 Hz. The maximum acceleration ( $m / s^{2}$ ) of the mass is

Discussion

44.	A body traveling along a straight line traversed first one third of the total distance with a velocity 4 m/s. The remaining part of the distance was covered with a velocity 2 m/s for half the time and with velocity 6 m/s for the other half of time. The mean velocity over the whole time of motion is
Answer» A body traveling along a straight line traversed first one third of the total distance with a velocity $4 m/s$ . The remaining part of the distance was covered with a velocity $2 m/s$ for half the time and with velocity $6 m/s$ for the other half of time. The mean velocity over the whole time of motion is

Discussion

45.	a body moving with uniform acceleration is having velocity 2m/s and 8m/s at t=1s and t=4s respectively. then average velocity of particle in the interval t-1s to t=4s is
Answer» a body moving with uniform acceleration is having velocity 2m/s and 8m/s at t=1s and t=4s respectively. then average velocity of particle in the interval t-1s to t=4s is

Discussion

46.	A particle executes SHM with time period T and amplitude A. The maximum possible average velocity in time T4 is:
Answer» A particle executes SHM with time period $T$ and amplitude $A$ . The maximum possible average velocity in time $\frac{T}{4}$ is:

Discussion

47.	A mass m rests on a horizontal surface. The coefficient of friction between the mass and the surface is μ. If the mass is pulled by a force F as shown in figure, the limiting friction between the mass and the surface will be
Answer» A mass $m$ rests on a horizontal surface. The coefficient of friction between the mass and the surface is $μ$ . If the mass is pulled by a force $F$ as shown in figure, the limiting friction between the mass and the surface will be

Discussion

48.	A block of mass 3 kg slides on a rough fixed inclined plane of 37∘angle , having coeffecient of friction 0.5. The resultant force exerted by plane on the block is -
Answer» A block of mass $3 kg$ slides on a rough fixed inclined plane of $37^{\circ}$ angle , having coeffecient of friction $0.5$ . The resultant force exerted by plane on the block is -

Discussion

49.	What is the SI unit of luminous intensity?
Answer» What is the SI unit of luminous intensity?

Discussion

50.	The lower end of a 4 m long uniform rod AB is pulled with constant speed v=4 m/s. The speed of the centre of mass of the rod when θ=60∘ will be
Answer» The lower end of a $4 m$ long uniform rod $A B$ is pulled with constant speed $v = 4 m/s$ . The speed of the centre of mass of the rod when $θ = 60^{\circ}$ will be

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions.

5. if identical charges (-q) are placed at each corner of a cube of side B, then electric potential of charge (+q) which is placed at centre of the cube will be A. 82q/4^° b B. 82q/^° b C. -42q/^° b D. -4q/3^° b

An electron accelerated by a potential difference V enters a uniform magnetic field of flux density B at right angles to the field. It describes a circular path of radius r. If V and B are doubled, then the radius of the new circular path is

Draw E-r and V - r graphs due to two point charges +q and -2qkept at some distance along the line joining these two charges.

Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have

Two rods of lengths l1 and l2 are made of materials whose coefficients of linear expansion are α1 and α2. If the difference between the two lengths is independent of temperature, then

A cyclist riding the bicycle at a speed of 14√3ms−1 takes a turn around a circular road of radius 20√3 m without skidding. Given g=9.8ms−2, what is his inclination to the vertical

A force F acting on an object varies with distanceas shown here. The force is in N and x in m.The work done by the force in moving the objectfrom x 0 to x = 6 m is \lbrack AIPMT (Prelims)-2005\rbrack113-2t#1 2 3 4 5 67x in(m)(1) 4.5 J(2) 13.5 J(3) 9.0 J(4) 18.0 JF in (N)

19.A thin glass (refractive index 1.5) lens has optical power of 5D in air. Its optical power in a liquid medium with refractive index 1.6 will be

ntThe de Broglie the de Broglie wavelength of an electron moving with velocity C/2(C= velocity of light in vaccum) is equal to the wavelength of a Photon. The ratio of kinetic energies of electron and Photon is:n nta. 1:4 b. 1:2 c. 4:1 d. 2:1n

electric potential at P,r dis†an ce away due to a point charge q at point A is V.If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius 4r with centre at point A,the potential at point P now is

For an isotropic material, the relationship between the young's modulus (E), shear modulus (G) and Poisson's ration (μ) is given by

82. Consider a system of two identical particles.one of the particle is at rest ant the other has an acceleration f. The centre of mass has an acceleration 1. Zero 2. f 3.f/2 4.2f

Which of the statement are true? 1) pressure exerted by the liquid depends upon depth of the liquid 2) pressure exerted by the liquid depends upon acceleration due to gravity

Four particles A, B, C and D having masses m, 2m, 3m and 4m respectively are placed in order at the corners of a square of side a. Locate the centre of mass

55. Each of two large conducting parallel plates has one sided surface area A. If one of the plates is given a charge Q whereas the other is neutral, then the electric field at a point in between the plates is given by (in terms of Q, A and epsilon)

A particle of specific charge alpha (charge/mass) startmoving from origin under action of an electric fieldE Eoi and magnetic field B-Bok. Its velocity at(xo.Y0,0) is 4j +3j. The value of xo is

A hollow charged metal sphere has radius r . If the potential difference between its surface and a point at a distance 3r from the centre is V , then electric field intensity at a distance 3r is A) V/2r B) V/3r C) V/6r D) V/4r

a body is projected from the centre of the earth in vertically upward direction inside a tunnel with speed vits velocity becomes 0 at a distance R/2 from surface of earth. Find the speed with which it was projected

a b omb of mass 20 kg initially at rest explodes into three piceces of mass 10 kg,m1,m2. if tge heavier one remains at rest and move direction to each other with same speed of 10m/s. then find the ratio of 1 and m2

The length of the compound microscope is 18 cm. The magnifying power for the relaxed eye is 28, find the object distance from the objective lens, if the focal length of the eyepiece is 4 cm.

A planet is made of two materials of density ρ1 and ρ2 as shown in figure. If the acceleration due to gravity at the surface of planet is same as at depth R, the ratio ρ1ρ2 is equal to x3. Then the value of x is . Write upto two digits after the decimal point.

Two spheres A and B have diameters in the ratio 1:2, densities in the ratio 2:1 and thermal capacities in the ratio 1:12. Find the ratio of their specific heat capacities.

4 partiches of equal masses round a circle of radius r due to tneir mutual gravitational attraction .find angular velocity of ach particle

50. What is the separation energy? What is the separation energy (in eV) for electron present in the first excited state of Be3+?

A body thrown up along a frictionless inclined plane of angle of inclination 30∘ covers a distance of 40 m along the plane. If the body id projected with the same speed at an angle of 30∘ with the ground, it will have a range of (Take g=10 ms−2)

(a) For what kinetic energy of a neutron will the associated de Broglie wavelength be 1.40 × 10–10 m? (b) Also find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of (3/2) k T at 300 K.

Half ring of radius a is uniformly charged with linear charge density λ. Find out electric field intensity at point O.

2 capacitors of capacitance C1 AND C2 r connected in parallel if a charge Q is given to combination the ratio of charge on capacitor C1 to the charge on C2 will be

A man of mass 60 kg runs up a flight of 30 steps in 40 seconds. If each step is 20 cm high, calculate the power of the man.

Consider a discrete time signal x[n] whose discrete time Fourier transform is X(ejω) where X(ejω)=11−e−jω⎛⎜⎜⎝sin32ωsinω2⎞⎟⎟⎠+5πδ(ω);−π≤ω≤π Then the value of x[n] at n=3 is4

A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are

Four positive charges (2√2−1)Q are arranged at the four corners of a square. Another charge q is placed at the centre of the square. Resulting field acting on each corner will be zero if q is

Find the period of oscillation of a simple pendulum of length L suspended from the roof of a vehicle which moves without friction down an inclined plane of inclination Alpha.

A weightless spring has a force constant k oscillates with frequency f when a mass m is suspended from it .The frequency of oscillations of one part will become

Two boys, first 52 inches tall and second 55 inches tall, are standing at the distances 4.0 m and 5.0 m respectively from an eye. Which boy will appear taller?

A point mass is executing simple harmonic motion with an amplitude of 10 mm and frequency of 4 Hz. The maximum acceleration (m/s2) of the mass is

A body traveling along a straight line traversed first one third of the total distance with a velocity 4 m/s. The remaining part of the distance was covered with a velocity 2 m/s for half the time and with velocity 6 m/s for the other half of time. The mean velocity over the whole time of motion is

a body moving with uniform acceleration is having velocity 2m/s and 8m/s at t=1s and t=4s respectively. then average velocity of particle in the interval t-1s to t=4s is

A particle executes SHM with time period T and amplitude A. The maximum possible average velocity in time T4 is:

A mass m rests on a horizontal surface. The coefficient of friction between the mass and the surface is μ. If the mass is pulled by a force F as shown in figure, the limiting friction between the mass and the surface will be

A block of mass 3 kg slides on a rough fixed inclined plane of 37∘angle , having coeffecient of friction 0.5. The resultant force exerted by plane on the block is -

What is the SI unit of luminous intensity?

The lower end of a 4 m long uniform rod AB is pulled with constant speed v=4 m/s. The speed of the centre of mass of the rod when θ=60∘ will be