50278 + Interview Questions in Physics

1.	Two massesm1 and m2 (m1 < m2) are released from rest from a finite distance. They start under their mutual gravitational attraction-
Answer» Two masses $m_{1}$ and $m_{2}$ ( $m_{1}$ $<$ $m_{2}$ ) are released from rest from a finite distance. They start under their mutual gravitational attraction-

Discussion

2.	A ball of mass 1 kg strikes a heavy platform, elastically, moving upwards with a velocity of 5 m/s. The speed of the ball just before the collision is 10 m/s downwards. Then the impulse imparted by the platform on the ball is (in N-s)
Answer» A ball of mass $1 kg$ strikes a heavy platform, elastically, moving upwards with a velocity of $5 m/s$ . The speed of the ball just before the collision is $10 m/s$ downwards. Then the impulse imparted by the platform on the ball is (in $N-s$ )

Discussion

3.	For a radioactive material, its activity A and rate of change of its activity R are defined as A=−dNdt and R=−dAdt, where N(t) is the number of nuclei at time t. Two radioactive sources P (mean life τ) and Q (mean life 2τ) have the same activity at t=0. Their rates of change of activities at t=2τ are RP and RQ, respectively, If RPRQ=ne, then the value of n is ____.
Answer» For a radioactive material, its activity $A$ and rate of change of its activity $R$ are defined as $A = \frac{- d N}{d t}$ and $R = \frac{- d A}{d t}$ , where $N (t)$ is the number of nuclei at time $t$ . Two radioactive sources $P$ (mean life $τ$ ) and $Q$ (mean life $2 τ$ ) have the same activity at $t = 0$ . Their rates of change of activities at $t = 2 τ$ are $R_{P}$ and $R_{Q}$ , respectively, If $\frac{R_{P}}{R_{Q}} = \frac{n}{e},$ then the value of $n$ is ____.

Discussion

4.	A rope of length 4 m having mass density 1.5 kg/m lying on a horizontal frictionless surface is pulled at one end by a force of 12 N. What is the tension in newtons in the rope at a point 1.6 m from the other end?
Answer» A rope of length 4 m having mass density 1.5 kg/m lying on a horizontal frictionless surface is pulled at one end by a force of 12 N. What is the tension in newtons in the rope at a point 1.6 m from the other end?

Discussion

5.	A perfect reflecting mirror of mass M mounted on a spring constitudes a spring-mass system of angular frequency Ω such that 4πMΩh=1024 m−2 with h as Planck's constant. N photons of wavelength λ=8π×10−6 m strike the mirror simultaneously at normal incidence such that the mirror gets displaced by 1 μm. If the value of N is X×1012, then the value of X is [Consider the spring as massless]
Answer» A perfect reflecting mirror of mass $M$ mounted on a spring constitudes a spring-mass system of angular frequency $Ω$ such that $\frac{4 π M Ω}{h} = 10^{24} m^{- 2}$ with $h$ as Planck's constant. $N$ photons of wavelength $λ = 8 π \times 10^{- 6}$ m strike the mirror simultaneously at normal incidence such that the mirror gets displaced by $1 μ m$ . If the value of $N$ is $X \times 10^{12}$ , then the value of $X$ is [Consider the spring as massless]

Discussion

6.	A smooth uniform rod of length L and mass M has two identical beads of negligible size, each of mass m, which can slide freely along the rod. Initially the two beads are at the centre of the rod and the system is rotating with an angular velocity ω0 about an axis perpendicular to the rod and passing through the mid-point of the rod (see figure). There are no external forces. When the beads reach the ends of the rod, the angular velocity of the system is
Answer» A smooth uniform rod of length $L$ and mass $M$ has two identical beads of negligible size, each of mass $m$ , which can slide freely along the rod. Initially the two beads are at the centre of the rod and the system is rotating with an angular velocity $ω_{0}$ about an axis perpendicular to the rod and passing through the mid-point of the rod (see figure). There are no external forces. When the beads reach the ends of the rod, the angular velocity of the system is

Discussion

7.	Masses of three wires of copper are in the ratio 1:3:5 and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistances are
Answer» Masses of three wires of copper are in the ratio $1 : 3 : 5$ and their lengths are in the ratio of $5 : 3 : 1$ . The ratio of their electrical resistances are

Discussion

8.	what is the exact definition for motion and rest
Answer» what is the exact definition for motion and rest

Discussion

9.	Arigid bar of mass 15 kg is supported symmetrically by three wireseach 2.0 m long. Those at each end are of copper and the middle oneis of iron. Determine the ratio of their diameters if each is to havethe same tension.
Answer» A rigid bar of mass 15 kg is supported symmetrically by three wires each 2.0 m long. Those at each end are of copper and the middle one is of iron. Determine the ratio of their diameters if each is to have the same tension.

Discussion

10.	Find the stopping distance of each car. Stopping distance of car with 72 km/h speed.
Answer» Find the stopping distance of each car. Stopping distance of car with 72 km/h speed.

Discussion

11.	A conducting rod is placed on a rough inclined plane as shown (side view of diagram is given below). What should be the magnitude and direction of current following through it so that it remains in equilibrium [Given: B=0.5 T, length of rod =10 cm, mass of rod =100 gm, μ=0.5 and g=10 m/s2]
Answer» A conducting rod is placed on a rough inclined plane as shown (side view of diagram is given below). What should be the magnitude and direction of current following through it so that it remains in equilibrium [Given: $B = 0.5 T$ , length of rod $= 10 cm$ , mass of rod $= 100 gm$ , $μ = 0.5$ and $g = 10 {m/s}^{2}$ ]

Discussion

12.	Draw the pattern of lines of force due to a magnetic field through and around a current carrying loop of wire. How would the strength of the magnetic field produced at the centre of the circular loop be affected if:(a) the strength of the current passing through this loop is double?(b) the radius of the loop is reduced to half of the original radius?
Answer» Draw the pattern of lines of force due to a magnetic field through and around a current carrying loop of wire. How would the strength of the magnetic field produced at the centre of the circular loop be affected if: (a) the strength of the current passing through this loop is double? (b) the radius of the loop is reduced to half of the original radius?

Discussion

13.	A point moves along a circle of radius 4 m. The distance x is related to time by x=ct3. What should be the value of c, so that the tangential acceleration is equal to the normal acceleration when its linear velocity is 4 m/s?
Answer» A point moves along a circle of radius $4 m$ . The distance $x$ is related to time by $x = c t^{3}$ . What should be the value of $c$ , so that the tangential acceleration is equal to the normal acceleration when its linear velocity is $4 m/s$ ?

Discussion

14.	The core of a toroid having 3000 turns has inner and outer radio of 16 cm and 17 cm respectively. The magnetic field in the core for a current of 0.07A is 2.5 T. What is relative permeability of the core?
Answer» The core of a toroid having 3000 turns has inner and outer radio of 16 cm and 17 cm respectively. The magnetic field in the core for a current of 0.07A is 2.5 T. What is relative permeability of the core?

Discussion

15.	Particle A makes a perfectly elastic collision with another particle B at rest.They fly apart in opposite direction with equal speeds.If their masses are Ma and Mb respectively .Then find relation between them
Answer» Particle A makes a perfectly elastic collision with another particle B at rest.They fly apart in opposite direction with equal speeds.If their masses are Ma and Mb respectively .Then find relation between them

Discussion

16.	An object is placed at a distance 2f from a convex mirror of focal length f draw a ray diagram showing the formation of image
Answer» An object is placed at a distance 2f from a convex mirror of focal length f draw a ray diagram showing the formation of image

Discussion

17.	three objects P Q R are thrown from the top of a tower with same speed P is thrown vertically upwards Q is thrown horizontally and R is thrown at some angle with the horizontal they hit the ground with speeds as VP VQ VR respectively then relation b/w VP VQ AND VR
Answer» three objects P Q R are thrown from the top of a tower with same speed P is thrown vertically upwards Q is thrown horizontally and R is thrown at some angle with the horizontal they hit the ground with speeds as VP VQ VR respectively then relation b/w VP VQ AND VR

Discussion

18.	S1 and S2 are two coherent sources of sound of frequency 110 Hz each and have no initial phase difference. The intensity at a point P due to S1 is I0 and due to S2 is 4I0. If the velocity of sound is 330 m/s, then the resultant intensity at P is
Answer» $S_{1}$ and $S_{2}$ are two coherent sources of sound of frequency $110 Hz$ each and have no initial phase difference. The intensity at a point P due to $S_{1}$ is $I_{0}$ and due to $S_{2}$ is $4 I_{0}$ . If the velocity of sound is $330 m/s$ , then the resultant intensity at P is

Discussion

19.	a coil of inductance 8.4mH and resistance 6ohms is connected to a 12V battery. the current in the coil is 1A at approx the time 1) 500sec 2) 20sec 3) 35 milli sec 4) 1 milli sec
Answer» a coil of inductance 8.4mH and resistance 6ohms is connected to a 12V battery. the current in the coil is 1A at approx the time 1) 500sec 2) 20sec 3) 35 milli sec 4) 1 milli sec

Discussion

20.	A thin uniformly charged ring of radius 1 m, charge +10 C and a semi-infinite charged wire of λ=+10 nC/m, oriented along the axis of ring with one of its ends coinciding with the centre of the ring, form a system. Find the force of interaction between the ring and wire.
Answer» A thin uniformly charged ring of radius $1 m$ , charge $+ 10 C$ and a semi-infinite charged wire of $λ = + 10 nC/m$ , oriented along the axis of ring with one of its ends coinciding with the centre of the ring, form a system. Find the force of interaction between the ring and wire.

Discussion

21.	nta body of mass m collides against a wall with a velocity v and retraces its path with the same speed . the change in momentum isn ntn
Answer» nta body of mass m collides against a wall with a velocity v and retraces its path with the same speed . the change in momentum isn ntn

Discussion

22.	The kinetic energy of electron in 4 orbit
Answer» The kinetic energy of electron in 4 orbit

Discussion

23.	Two small spheres, each having a mass of 20 g, are suspended from a common point by two insulating strings of length 40 cm each. The spheres are identically charged and the separation between the balls at equilibrium is found to be 4cm. Find the charge on each sphere
Answer» Two small spheres, each having a mass of 20 g, are suspended from a common point by two insulating strings of length 40 cm each. The spheres are identically charged and the separation between the balls at equilibrium is found to be 4cm. Find the charge on each sphere

Discussion

24.	A paramagnetic material has magnetic susceptibility of 3.3×10−4 at 300 K. Its susceptibility at 350 K is
Answer» A paramagnetic material has magnetic susceptibility of $3.3 \times 10^{- 4}$ at $300 K$ . Its susceptibility at $350 K$ is

Discussion

25.	Symbolic representation of photodiode is
Answer» Symbolic representation of photodiode is

Discussion

26.	by what rational no should -7/85 be multipled to obtain 1/34
Answer» by what rational no should -7/85 be multipled to obtain 1/34

Discussion

27.	In the Young’s double slit experiment the resultant intensity at a point on the screen is 75% of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is
Answer» In the Young’s double slit experiment the resultant intensity at a point on the screen is 75% of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is

Discussion

28.	The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is 104. The height of the hill is
Answer» The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is $10^{4}$ . The height of the hill is

Discussion

29.	A particle of mass "m" and charge "q" is released from rest in a uniform electric field of intensity "E". Calculate the kinetic energy it attains after moving a distance "s" between the plates?
Answer» A particle of mass "m" and charge "q" is released from rest in a uniform electric field of intensity "E". Calculate the kinetic energy it attains after moving a distance "s" between the plates?

Discussion

30.	A particular of mass m and charge q is thrown at a speed u against a uniform electric field E. How much distance will it travel before coming to momentary rest?
Answer» A particular of mass m and charge q is thrown at a speed u against a uniform electric field E. How much distance will it travel before coming to momentary rest?

Discussion

31.	The trajectory of a projectile in a vertical plane is, y=αx−βx2, where α,β are constants, x and y are respectively the horizontal and vertical distances of the projectile from the point of projection. The angle of projection and the maximum height attained are respectively given by :
Answer» The trajectory of a projectile in a vertical plane is, $y = α x - β x^{2}$ , where $α, β$ are constants, $x$ and $y$ are respectively the horizontal and vertical distances of the projectile from the point of projection. The angle of projection and the maximum height attained are respectively given by :

Discussion

32.	A storage battery of emf 8.0 V and internal resistance 0.5 W is beingcharged by a 120 V dc supply using a series resistor of 15.5 W. Whatis the terminal voltage of the battery during charging? What is thepurpose of having a series resistor in the charging circuit?
Answer» A storage battery of emf 8.0 V and internal resistance 0.5 W is beingcharged by a 120 V dc supply using a series resistor of 15.5 W. Whatis the terminal voltage of the battery during charging? What is thepurpose of having a series resistor in the charging circuit?

Discussion

33.	A person sitting firmly over a stool rotating on a smooth floor has his arms stretched. If he folds his arms,
Answer» A person sitting firmly over a stool rotating on a smooth floor has his arms stretched. If he folds his arms,

Discussion

34.	Find the maximum and minimum value of y=1+2sinx respectively.
Answer» Find the maximum and minimum value of $y = 1 + 2 s i n x$ respectively.

Discussion

35.	on an inclined plane inclined at a angle of 30 to the horizontal a ball is thrown upwards with velocity of 10m/s at an angle pf 60 to the inclined plane its range on the inclined plane is
Answer» on an inclined plane inclined at a angle of 30 to the horizontal a ball is thrown upwards with velocity of 10m/s at an angle pf 60 to the inclined plane its range on the inclined plane is

Discussion

36.	there is a small ball of A of mass m which is suspended vertically with the help of a light string of length l. A bullet of same mass and moving with horizontal speed u (u
Answer» there is a small ball of A of mass m which is suspended vertically with the help of a light string of length l. A bullet of same mass and moving with horizontal speed u (u<=(6gl)^1/2 strikes the ball and gets embeded in it . the maximum angular deflection of the string from vertical will be?

Discussion

37.	A four bar mechanism is shown in the figure. The link numbers are mentioned near the links. Input link 2 is rotating anticlockwise with a constant angular speed ω2. Length of different links are:O2O4=O2A=L,AB=O4B=√2LThe magnitude of the angular speed of the output link 4 is ω4at the instant when link 2 makes an angle of 90o with O2O4 as shown. The ratio ω4ω2is (round off to two decimal places).
Answer» A four bar mechanism is shown in the figure. The link numbers are mentioned near the links. Input link 2 is rotating anticlockwise with a constant angular speed $ω_{2}$ . Length of different links are: $O_{2} O_{4} = O_{2} A = L, A B = O_{4} B = \sqrt{2} L$ The magnitude of the angular speed of the output link 4 is $ω_{4}$ at the instant when link 2 makes an angle of $90^{o}$ with $O_{2} O_{4}$ as shown. The ratio $\frac{ω_{4}}{ω_{2}}$ is (round off to two decimal places).

Discussion

38.	Strain is a unitless quantity. Why?
Answer» Strain is a unitless quantity. Why?

Discussion

39.	If y=x4+5ex+9, then d2ydx2 is
Answer» If $y = x^{4} + 5 e^{x} + 9$ , then $\frac{d^{2} y}{d x^{2}}$ is

Discussion

40.	Can two electric field lines intersect each other? Justify your answer.
Answer» Can two electric field lines intersect each other? Justify your answer.

Discussion

41.	What is the angle between a vector and its negative vector?
Answer» What is the angle between a vector and its negative vector?

Discussion

42.	There are four point masses M each on the corners of a square of side length L.what is the moment of inertia of the system about one of its diagonal
Answer» There are four point masses M each on the corners of a square of side length L.what is the moment of inertia of the system about one of its diagonal

Discussion

43.	A balloon has a volume of 0.09 m3 below the surface of the water (density =103 kg/m3) at a depth of 40 m. If the temperature remains constant, what is its volume in m3 when it is at the surface where the pressure is 1×105 N/m2
Answer» A balloon has a volume of $0.09 m^{3}$ below the surface of the water (density $= 10^{3} {kg/m}^{3}$ ) at a depth of $40 m$ . If the temperature remains constant, what is its volume in $m^{3}$ when it is at the surface where the pressure is $1 \times 10^{5} {N/m}^{2}$

Discussion

44.	Figure 9.37 shows an equiconvex lens (of refractive index 1.50) incontact with a liquid layer on top of a plane mirror. A small needlewith its tip on the principal axis is moved along the axis until itsinverted image is found at the position of the needle. The distance ofthe needle from the lens is measured to be 45.0cm. The liquid isremoved and the experiment is repeated. The new distance ismeasured to be 30.0cm. What is the refractive index of the liquid?
Answer» Figure 9.37 shows an equiconvex lens (of refractive index 1.50) incontact with a liquid layer on top of a plane mirror. A small needlewith its tip on the principal axis is moved along the axis until itsinverted image is found at the position of the needle. The distance ofthe needle from the lens is measured to be 45.0cm. The liquid isremoved and the experiment is repeated. The new distance ismeasured to be 30.0cm. What is the refractive index of the liquid?

Discussion

45.	If VAB=4 V in the given figure, then the value of internal resistance x of battery having emf 2 V will be
Answer» If $V_{A B} = 4 V$ in the given figure, then the value of internal resistance $x$ of battery having emf $2 V$ will be

Discussion

46.	In the previous question
Answer» In the previous question

Discussion

47.	The work function of a photoelectric material is 4.0 eV. (a) What is the threshold wavelength ? (b) Find the wavelength of light for which the stopping potential is 2.5 V.
Answer» The work function of a photoelectric material is 4.0 eV. (a) What is the threshold wavelength ? (b) Find the wavelength of light for which the stopping potential is 2.5 V.

Discussion

48.	In Figure shows water in a container having 2.0 mm thick walls made of a material of thermal conductivity 0.50 Wm−1∘C−1. The container is kept in a melting- ice bath at 0∘C. The total surface area in contact with water is 0.05m2. A wheel is clamped inside the water and is coupled to a block of mass M as shown in the figure. As the block goes down, the wheel rotates. It is found that after some time a steady state is reached in which the block goes down with a constan speed of 10cms−1 and the temperature of the water remains constant at 1.0∘C. Find the mass M of the block. Assume that the heat flows out of the water only through the walls in contact. Take g = 10ms−2.
Answer» In Figure shows water in a container having 2.0 mm thick walls made of a material of thermal conductivity 0.50 $W m^{- 1 \circ} C^{- 1}$ . The container is kept in a melting- ice bath at $0^{\circ} C$ . The total surface area in contact with water is $0.05 m^{2}$ . A wheel is clamped inside the water and is coupled to a block of mass M as shown in the figure. As the block goes down, the wheel rotates. It is found that after some time a steady state is reached in which the block goes down with a constan speed of $10 c m s^{- 1}$ and the temperature of the water remains constant at ${1.0}^{\circ} C$ . Find the mass M of the block. Assume that the heat flows out of the water only through the walls in contact. Take g = $10 m s^{- 2}$ .

48.

In Figure shows water in a container having 2.0 mm thick walls made of a material of thermal conductivity 0.50 Wm−1∘C−1. The container is kept in a melting- ice bath at 0∘C. The total surface area in contact with water is 0.05m2. A wheel is clamped inside the water and is coupled to a block of mass M as shown in the figure. As the block goes down, the wheel rotates. It is found that after some time a steady state is reached in which the block goes down with a constan speed of 10cms−1 and the temperature of the water remains constant at 1.0∘C. Find the mass M of the block. Assume that the heat flows out of the water only through the walls in contact. Take g = 10ms−2.

Answer»

In Figure shows water in a container having 2.0 mm thick walls made of a material of thermal conductivity 0.50 $W m^{- 1 \circ} C^{- 1}$ . The container is kept in a melting- ice bath at $0^{\circ} C$ . The total surface area in contact with water is $0.05 m^{2}$ . A wheel is clamped inside the water and is coupled to a block of mass M as shown in the figure. As the block goes down, the wheel rotates. It is found that after some time a steady state is reached in which the block goes down with a constan speed of $10 c m s^{- 1}$ and the temperature of the water remains constant at ${1.0}^{\circ} C$ . Find the mass M of the block. Assume that the heat flows out of the water only through the walls in contact. Take g = $10 m s^{- 2}$ .

Discussion

49.	Two NOT gates and one AND gate are connected as shown. The resulting gate is
Answer» Two NOT gates and one AND gate are connected as shown. The resulting gate is

49.

Two NOT gates and one AND gate are connected as shown. The resulting gate is

Answer»

Two NOT gates and one AND gate are connected as shown. The resulting gate is

Discussion

50.	A Carnot engine has an efficiency of 16. When the temperature of the sink is reduced by 62∘C, its efficiency is doubled. The temperatures of the source and the sink are respectively
Answer» A Carnot engine has an efficiency of $\frac{1}{6}$ . When the temperature of the sink is reduced by $62^{\circ} C$ , its efficiency is doubled. The temperatures of the source and the sink are respectively

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two massesm1 and m2 (m1 &lt; m2) are released from rest from a finite distance. They start under their mutual gravitational attraction-

A ball of mass 1 kg strikes a heavy platform, elastically, moving upwards with a velocity of 5 m/s. The speed of the ball just before the collision is 10 m/s downwards. Then the impulse imparted by the platform on the ball is (in N-s)

A rope of length 4 m having mass density 1.5 kg/m lying on a horizontal frictionless surface is pulled at one end by a force of 12 N. What is the tension in newtons in the rope at a point 1.6 m from the other end?

Masses of three wires of copper are in the ratio 1:3:5 and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistances are

what is the exact definition for motion and rest

Arigid bar of mass 15 kg is supported symmetrically by three wireseach 2.0 m long. Those at each end are of copper and the middle oneis of iron. Determine the ratio of their diameters if each is to havethe same tension.

Find the stopping distance of each car. Stopping distance of car with 72 km/h speed.

A conducting rod is placed on a rough inclined plane as shown (side view of diagram is given below). What should be the magnitude and direction of current following through it so that it remains in equilibrium [Given: B=0.5 T, length of rod =10 cm, mass of rod =100 gm, μ=0.5 and g=10 m/s2]

A point moves along a circle of radius 4 m. The distance x is related to time by x=ct3. What should be the value of c, so that the tangential acceleration is equal to the normal acceleration when its linear velocity is 4 m/s?

The core of a toroid having 3000 turns has inner and outer radio of 16 cm and 17 cm respectively. The magnetic field in the core for a current of 0.07A is 2.5 T. What is relative permeability of the core?

Particle A makes a perfectly elastic collision with another particle B at rest.They fly apart in opposite direction with equal speeds.If their masses are Ma and Mb respectively .Then find relation between them

An object is placed at a distance 2f from a convex mirror of focal length f draw a ray diagram showing the formation of image

three objects P Q R are thrown from the top of a tower with same speed P is thrown vertically upwards Q is thrown horizontally and R is thrown at some angle with the horizontal they hit the ground with speeds as VP VQ VR respectively then relation b/w VP VQ AND VR

S1 and S2 are two coherent sources of sound of frequency 110 Hz each and have no initial phase difference. The intensity at a point P due to S1 is I0 and due to S2 is 4I0. If the velocity of sound is 330 m/s, then the resultant intensity at P is

a coil of inductance 8.4mH and resistance 6ohms is connected to a 12V battery. the current in the coil is 1A at approx the time 1) 500sec 2) 20sec 3) 35 milli sec 4) 1 milli sec

A thin uniformly charged ring of radius 1 m, charge +10 C and a semi-infinite charged wire of λ=+10 nC/m, oriented along the axis of ring with one of its ends coinciding with the centre of the ring, form a system. Find the force of interaction between the ring and wire.

nta body of mass m collides against a wall with a velocity v and retraces its path with the same speed . the change in momentum isn ntn

The kinetic energy of electron in 4 orbit

Two small spheres, each having a mass of 20 g, are suspended from a common point by two insulating strings of length 40 cm each. The spheres are identically charged and the separation between the balls at equilibrium is found to be 4cm. Find the charge on each sphere

A paramagnetic material has magnetic susceptibility of 3.3×10−4 at 300 K. Its susceptibility at 350 K is

Symbolic representation of photodiode is

by what rational no should -7/85 be multipled to obtain 1/34

In the Young’s double slit experiment the resultant intensity at a point on the screen is 75% of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is

The height of a mercury barometer is 75 cm at sea level and 50 cm at the top of a hill. Ratio of density of mercury to that of air is 104. The height of the hill is

A particle of mass "m" and charge "q" is released from rest in a uniform electric field of intensity "E". Calculate the kinetic energy it attains after moving a distance "s" between the plates?

A particular of mass m and charge q is thrown at a speed u against a uniform electric field E. How much distance will it travel before coming to momentary rest?

The trajectory of a projectile in a vertical plane is, y=αx−βx2, where α,β are constants, x and y are respectively the horizontal and vertical distances of the projectile from the point of projection. The angle of projection and the maximum height attained are respectively given by :

A storage battery of emf 8.0 V and internal resistance 0.5 W is beingcharged by a 120 V dc supply using a series resistor of 15.5 W. Whatis the terminal voltage of the battery during charging? What is thepurpose of having a series resistor in the charging circuit?

A person sitting firmly over a stool rotating on a smooth floor has his arms stretched. If he folds his arms,

Find the maximum and minimum value of y=1+2sinx respectively.

on an inclined plane inclined at a angle of 30 to the horizontal a ball is thrown upwards with velocity of 10m/s at an angle pf 60 to the inclined plane its range on the inclined plane is

there is a small ball of A of mass m which is suspended vertically with the help of a light string of length l. A bullet of same mass and moving with horizontal speed u (u

Strain is a unitless quantity. Why?

If y=x4+5ex+9, then d2ydx2 is

Can two electric field lines intersect each other? Justify your answer.

What is the angle between a vector and its negative vector?

There are four point masses M each on the corners of a square of side length L.what is the moment of inertia of the system about one of its diagonal

A balloon has a volume of 0.09 m3 below the surface of the water (density =103 kg/m3) at a depth of 40 m. If the temperature remains constant, what is its volume in m3 when it is at the surface where the pressure is 1×105 N/m2

If VAB=4 V in the given figure, then the value of internal resistance x of battery having emf 2 V will be

In the previous question

The work function of a photoelectric material is 4.0 eV. (a) What is the threshold wavelength ? (b) Find the wavelength of light for which the stopping potential is 2.5 V.

Two NOT gates and one AND gate are connected as shown. The resulting gate is

A Carnot engine has an efficiency of 16. When the temperature of the sink is reduced by 62∘C, its efficiency is doubled. The temperatures of the source and the sink are respectively

Two massesm1 and m2 (m1 < m2) are released from rest from a finite distance. They start under their mutual gravitational attraction-