50278 + Interview Questions in Physics Page 126 InterviewSolution

6251.	Consider that the system shown below is released from rest. The work done by force of gravity during first 2 seconds of the motion is (Take g=10 ms−2 )
Answer» Consider that the system shown below is released from rest. The work done by force of gravity during first $2$ seconds of the motion is (Take $g = 10 m s^{- 2}$ )

Discussion

6252.	A block of mass 1 kg attached to a spring is made to oscillate with an initial amplitude of 12 cm. After 2 minutes the amplitude decreases to 6 cm. Determine the value of the damping constant for this motion. (take ln2=0.693).
Answer» A block of mass $1 kg$ attached to a spring is made to oscillate with an initial amplitude of $12 cm$ . After $2$ minutes the amplitude decreases to $6 cm$ . Determine the value of the damping constant for this motion. (take $l n 2 = 0.693$ ).

Discussion

6253.	two travelling waves Y equal to 0.1 sin3t + 4 pi X and Y = 0.2 sin3t minus 5 by X meet at t = 0 what is the displacement at x is equal to 4.5 at this moment
Answer» two travelling waves Y equal to 0.1 sin3t + 4 pi X and Y = 0.2 sin3t minus 5 by X meet at t = 0 what is the displacement at x is equal to 4.5 at this moment

Discussion

6254.	a converging lens of focal length 30 cm is placed in contact with another converging lens of unknown focal length and the possible value for the focal length of the combination is
Answer» a converging lens of focal length 30 cm is placed in contact with another converging lens of unknown focal length and the possible value for the focal length of the combination is

Discussion

6255.	If →a1,→b1,→c1 is the reciprocal system of vector triad of →a,→b,→c, then →a.→b1+→b.→c1+→c.→a1=
Answer» If $^{1},^{1},^{1}$ is the reciprocal system of vector triad of $\to a, \to b, \to c$ , then $\to a .^{1} + \to b .^{1} + \to c .^{1} =$

Discussion

6256.	40.IN A CASE WHERE A POINT CHARGE q IS PLACED AT THE CENTRE OF THE SHELL (METALLIC SPHERICAL SHELLCONTAINING Q CHARGE ON IT). ALSO PLACED IN THE SHELL'S VICINITY IS A POSITIVE CHARGE q1 ; THEN THE ELECTRIC FIELD ON THE INNER CHARGE DUE TO THE METALLIC SPHERE IS NON-ZERO?
Answer» 40.IN A CASE WHERE A POINT CHARGE q IS PLACED AT THE CENTRE OF THE SHELL (METALLIC SPHERICAL SHELLCONTAINING Q CHARGE ON IT). ALSO PLACED IN THE SHELL'S VICINITY IS A POSITIVE CHARGE q1 ; THEN THE ELECTRIC FIELD ON THE INNER CHARGE DUE TO THE METALLIC SPHERE IS NON-ZERO?

Discussion

6257.	31. Two blocks of masses 5 kg and 4 kg are connectedwith ideal string which is passing over an ideal pulleyshown in figure. If the system is released fromrest then the magnitude of acceleration of the blockswill be (Take g= 10 ms 2 and3=1.7)
Answer» 31. Two blocks of masses 5 kg and 4 kg are connectedwith ideal string which is passing over an ideal pulleyshown in figure. If the system is released fromrest then the magnitude of acceleration of the blockswill be (Take g= 10 ms 2 and3=1.7)

Discussion

6258.	20. a particle executes linear SHM of period 4second and amplitude 4 cm ,the time taken by it to describe a distance of 1 cm from the extreme position
Answer» 20. a particle executes linear SHM of period 4second and amplitude 4 cm ,the time taken by it to describe a distance of 1 cm from the extreme position

Discussion

6259.	The magnification of an object placed in front of a convex lens is +2. The focal length of the lens is 2 metres. Find the distance by which object has to be moved to obtain a magnification of -2 (in metres). ___
Answer» The magnification of an object placed in front of a convex lens is +2. The focal length of the lens is 2 metres. Find the distance by which object has to be moved to obtain a magnification of -2 (in metres). ___

Discussion

6260.	What are the two conditions for the inter-conversion of states of matter?
Answer» What are the two conditions for the inter-conversion of states of matter?

Discussion

6261.	Give some methods to increase friction.
Answer» Give some methods to increase friction.

Discussion

6262.	In the given figure, the position - time graph of a particle of mass 0.1 kg is shown. The magnitude of impulse at t=2 sec is:
Answer» In the given figure, the position - time graph of a particle of mass $0.1 kg$ is shown. The magnitude of impulse at $t = 2$ sec is:

Discussion

6263.	Charge on a capacitor plate during charging is given by Q=Q°(1-e^-t/RC). Where symbol have their casual meaning.sketch graph between q and t.
Answer» Charge on a capacitor plate during charging is given by Q=Q°(1-e^-t/RC). Where symbol have their casual meaning.sketch graph between q and t.

Discussion

6264.	The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at(IIT-JEE 1980)
Answer» The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at (IIT-JEE 1980)

Discussion

6265.	The speed v of a particle moving along x-axis is given by, v2=8bx−x2−12b2, where b is a constant. Find amplitude of oscillations. (b = 2 units)
Answer» The speed $v$ of a particle moving along x-axis is given by, $v^{2} = 8 b x - x^{2} - 12 b^{2},$ where b is a constant. Find amplitude of oscillations. (b = 2 units)

Discussion

6266.	The cofficient of static frictions between a block of mass m and an incline is v=0.3 a what incline with the horizontal so that the block does not slip on the plane
Answer» The cofficient of static frictions between a block of mass m and an incline is v=0.3 a what incline with the horizontal so that the block does not slip on the plane

Discussion

6267.	Consider a cylindrical tube of length 240 cm which is closed at one end . It is slowly filled with water such that water in the tube increases at a rate of 2 cm/s. The rate of change of fundamental frequency when the water level in the tube is 120 cm is nearly what?
Answer» Consider a cylindrical tube of length 240 cm which is closed at one end . It is slowly filled with water such that water in the tube increases at a rate of 2 cm/s. The rate of change of fundamental frequency when the water level in the tube is 120 cm is nearly what?

Discussion

6268.	Shown in the figure, are three waves originating from a point source. Points A,B,C lie on trough while points D,E,F lie on crest of the wave. A wavefront emitting from O may pass through,
Answer» Shown in the figure, are three waves originating from a point source. Points $A, B, C$ lie on trough while points $D, E, F$ lie on crest of the wave. A wavefront emitting from $O$ may pass through,

Discussion

6269.	The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
Answer» The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

Discussion

6270.	One mole of an ideal gas undergoes a process P=P01+(V0V)2. Here, P0 and V0 are constants. Change in temperature of the gas when volume is changed from V=V0 to V=2V0 is
Answer» One mole of an ideal gas undergoes a process $P = \frac{P_{0}}{1 + {(\frac{V_{0}}{V})}^{2}}$ . Here, $P_{0}$ and $V_{0}$ are constants. Change in temperature of the gas when volume is changed from $V = V_{0}$ to $V = 2 V_{0}$ is

Discussion

6271.	45, Half-cell reaction for a half-cell,Hgl) + 20H' (aq)- HgO(s) + H20(1) + 2e-This half-cell is reversible to(a) H20(l)(c) OH (aq)(b) HgO(s)(d) All are correct
Answer» 45, Half-cell reaction for a half-cell,Hgl) + 20H' (aq)- HgO(s) + H20(1) + 2e-This half-cell is reversible to(a) H20(l)(c) OH (aq)(b) HgO(s)(d) All are correct

Discussion

6272.	How to solve circuit with nodal analysis ? Some sort of difficult circuit.
Answer» How to solve circuit with nodal analysis ? Some sort of difficult circuit.

Discussion

6273.	Two parallel rails with negligible resistance are 10.0 cm apart. They are connected by a 5.0 Ω resistor. The arrangement also contains two metal rods having resistances of 10.0 Ω and 15.0 Ω as shown in the figure. The rods are pulled away from the resistor at constant speeds of 4.0 m/s and 2.0 m/s respectively. A uniform magnetic field of magnitude 0.01 T is applied perpendicular to the plane of the rails. Determine the current in the 5.0 Ω resistor.
Answer» Two parallel rails with negligible resistance are $10.0 cm$ apart. They are connected by a $5.0 Ω$ resistor. The arrangement also contains two metal rods having resistances of $10.0 Ω$ and $15.0 Ω$ as shown in the figure. The rods are pulled away from the resistor at constant speeds of $4.0 m/s$ and $2.0 m/s$ respectively. A uniform magnetic field of magnitude $0.01 T$ is applied perpendicular to the plane of the rails. Determine the current in the $5.0 Ω$ resistor.

Discussion

6274.	if a body is thrown upward and gets vcome back then displace ment velocity is when negetive and positiv
Answer» if a body is thrown upward and gets vcome back then displace ment velocity is when negetive and positiv

Discussion

6275.	The dimensional formula for coefficient of kinematics viscosity is
Answer» The dimensional formula for coefficient of kinematics viscosity is

Discussion

6276.	The electric energy density in an EM wave is:
Answer» The electric energy density in an EM wave is:

Discussion

6277.	Select the correct curve(s). If v = velocity of electron in Bohr's orbit r = Radius of electron n Bohr's orbit P.E = Potential energy of electron in Bohr's orbit K.E = Kinetic energy of electron in Bohr's orbit
Answer» Select the correct curve(s). If v = velocity of electron in Bohr's orbit r = Radius of electron n Bohr's orbit P.E = Potential energy of electron in Bohr's orbit K.E = Kinetic energy of electron in Bohr's orbit

Discussion

6278.	The position vector →r=5.00t^i+(et+ft2)^j locates a particle as a function of time t. Vector →r is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle θ of the particle's direction of travel as a function of t(θ) is measured from the positive x direction). What are 'e' and 'f', including units?
Answer» The position vector $\to r = 5.00 t^i + (e t + f t^{2})^j$ locates a particle as a function of time t. Vector $\to r$ is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle $θ$ of the particle's direction of travel as a function of t( $θ$ ) is measured from the positive x direction). What are 'e' and 'f', including units?

6278.

The position vector →r=5.00t^i+(et+ft2)^j locates a particle as a function of time t. Vector →r is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle θ of the particle's direction of travel as a function of t(θ) is measured from the positive x direction). What are 'e' and 'f', including units?

Answer»

The position vector $\to r = 5.00 t^i + (e t + f t^{2})^j$ locates a particle as a function of time t. Vector $\to r$ is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle $θ$ of the particle's direction of travel as a function of t( $θ$ ) is measured from the positive x direction). What are 'e' and 'f', including units?

Discussion

6279.	Particle 1 of mass m1 collides with a stationary particle 2 of mass m2 elastically. Find the ratio of m2m1, if after collision they move in opposite direction with equal velocities.Assume Head on collision
Answer» Particle 1 of mass $m_{1}$ collides with a stationary particle 2 of mass $m_{2}$ elastically. Find the ratio of $\frac{m_{2}}{m_{1}}$ , if after collision they move in opposite direction with equal velocities. Assume Head on collision

Discussion

6280.	At what angle of inclination the height of projectile is equal to range of projectile?Explain.
Answer» At what angle of inclination the height of projectile is equal to range of projectile?Explain.

Discussion

6281.	the work function for a metal is 4ev to eject the photo electrons with 0 velocity the wave length of the incident light should
Answer» the work function for a metal is 4ev to eject the photo electrons with 0 velocity the wave length of the incident light should

Discussion

6282.	ntIS THERE ANY REASON -THE THRUST FACED DURING UPTHRUST ALWAYS POINT TOWARDS UPWARD DIRECTION AND NOT IN DOWNWARD DIRECTION ?n
Answer» ntIS THERE ANY REASON -THE THRUST FACED DURING UPTHRUST ALWAYS POINT TOWARDS UPWARD DIRECTION AND NOT IN DOWNWARD DIRECTION ?n

Discussion

6283.	For the system shown below, block B is moving upward with an acceleration a. What will be the acceleration of block A, if the string is inextensible and pulleys are frictionless?
Answer» For the system shown below, block $B$ is moving upward with an acceleration $a$ . What will be the acceleration of block $A$ , if the string is inextensible and pulleys are frictionless?

Discussion

6284.	extension produced in a wire when a sphere of raduis r attached at its lower end is e.extension produced when sphere is replaced with another sphere of raduis 3r and of same material
Answer» extension produced in a wire when a sphere of raduis r attached at its lower end is e.extension produced when sphere is replaced with another sphere of raduis 3r and of same material

Discussion

6285.	125.Find the potential diference across the capacitor in volts? 1)4V 2)2V 3)1V 4)8V .
Answer» 125.Find the potential diference across the capacitor in volts? 1)4V 2)2V 3)1V 4)8V .

Discussion

6286.	Match list-I with list-II and select the correct answer using the codes given below the lists: List−IList−II(P)Ecotone(1)Running water(Q)Benthic(2)Replacement of one community(R)Sere(3)Transitional zone between two communities(S)Lotic(4)Zone found at the bottom of the sea
Answer» Match list-I with list-II and select the correct answer using the codes given below the lists: $\begin{matrix} L i s t - I & L i s t - I I (P) & E c o t o n e & (1) & R u n n i n g w a t e r (Q) & B e n t h i c & (2) & R e p l a c e m e n t o f o n e c o m m u n i t y (R) & S e r e & (3) & T r a n s i t i o n a l z o n e b e t w e e n t w o c o m m u n i t i e s (S) & L o t i c & (4) & Z o n e f o u n d a t t h e b o t t o m o f t h e s e a \end{matrix}$

Discussion

6287.	Forbidden energy gap of Ge is 0.75 eV, maximum wavelength of incident radiation for producing electron-hole pair in germanium semiconductor is-[Use h=6.6×10−34 Js]
Answer» Forbidden energy gap of $Ge is 0.75 eV$ , maximum wavelength of incident radiation for producing electron-hole pair in germanium semiconductor is- [Use $h = 6.6 \times 10^{- 34} Js$ ]

Discussion

6288.	A rectangular channel 4 m wide shows a wavy surface at a depth of 2.5 m, the rate of discharge in the channel (in m3/sec ) is.49.5
Answer» A rectangular channel 4 m wide shows a wavy surface at a depth of 2.5 m, the rate of discharge in the channel (in $m^{3}$ /sec ) is. 49.5

Discussion

6289.	Using a pinhole camera, the image of the following tree is captured.How will the image look?
Answer» Using a pinhole camera, the image of the following tree is captured. How will the image look?

6289.

Using a pinhole camera, the image of the following tree is captured.How will the image look?

Answer»

Using a pinhole camera, the image of the following tree is captured.

How will the image look?

Discussion

6290.	The angle between vector →A and −2→A is
Answer» The angle between vector $\to A$ and $- 2 \to A$ is

Discussion

6291.	Current flowing in a circuit having resistance of 30 W and an inductance of (0.4/ π ) H connected to an A.C. supply of 100 V and 50 Hz in series is
Answer» Current flowing in a circuit having resistance of 30 W and an inductance of (0.4/ $π$ ) H connected to an A.C. supply of 100 V and 50 Hz in series is

Discussion

6292.	What is horizontal motion?
Answer» What is horizontal motion?

Discussion

6293.	A small block is connected to one end of two identical massless strings of length 1623 cm each with their other ends fixed to a vertical rod. If the ratio of tensions T1T2 is 4:1, then what will be the angular velocity of the block? [Take g=9.8 ms−2].
Answer» A small block is connected to one end of two identical massless strings of length $16 \frac{2}{3} cm$ each with their other ends fixed to a vertical rod. If the ratio of tensions $\frac{T_{1}}{T_{2}}$ is $4 : 1$ , then what will be the angular velocity of the block? [Take $g = 9.8 {ms}^{- 2}$ ].

Discussion

6294.	A charge 'q' is placed at a point exactly above the centre of square (of side a) at a distance a/2. The flux passing through square will be.
Answer» A charge 'q' is placed at a point exactly above the centre of square (of side a) at a distance a/2. The flux passing through square will be.

Discussion

6295.	The ratio of de Brogile wave length of molcules of hydrogen and helium in two gas jars kept separately at temperatures of 27∘ C and 127∘ C respectively is
Answer» The ratio of de Brogile wave length of molcules of hydrogen and helium in two gas jars kept separately at temperatures of $27^{\circ}$ C and $127^{\circ}$ C respectively is

Discussion

6296.	Shaft power measurement of a rotating shaft is to be carried out by measuring the angular velocity and torque. The power consumed was 5.5 kW at constant angular velocity. The velocity measured using variable reluctance type tachometer. If the counter of the tachometer indicates 1000 pulses in 10sec and the tachometer wheel is having 60 teeth then the developed torque in the shaft in (N-m) approximately is __________. 525.211
Answer» Shaft power measurement of a rotating shaft is to be carried out by measuring the angular velocity and torque. The power consumed was 5.5 kW at constant angular velocity. The velocity measured using variable reluctance type tachometer. If the counter of the tachometer indicates 1000 pulses in 10sec and the tachometer wheel is having 60 teeth then the developed torque in the shaft in (N-m) approximately is __________. 525.211

Discussion

6297.	The potential energy of a body of mass 3 kg on the surface of a planet is 54 J Its escape velocity will be –
Answer» The potential energy of a body of mass $3 kg$ on the surface of a planet is $54 J$ Its escape velocity will be –

Discussion

6298.	A fish lies at the bottom of a 8 m deep water lake. A bird flies 12 m above the water surface and refractive index of water is 4/3. Then calculate the distance between fish and the image of bird.
Answer» A fish lies at the bottom of a 8 m deep water lake. A bird flies 12 m above the water surface and refractive index of water is 4/3. Then calculate the distance between fish and the image of bird.

Discussion

6299.	A bike is going on a concave upward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?
Answer» A bike is going on a concave upward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

6299.

A bike is going on a concave upward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

Answer»

A bike is going on a concave upward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

Discussion

6300.	Motion under gravity ~ how to make formula
Answer» Motion under gravity ~ how to make formula

Discussion

Explore topic-wise InterviewSolutions in .

Consider that the system shown below is released from rest. The work done by force of gravity during first 2 seconds of the motion is (Take g=10 ms−2 )

A block of mass 1 kg attached to a spring is made to oscillate with an initial amplitude of 12 cm. After 2 minutes the amplitude decreases to 6 cm. Determine the value of the damping constant for this motion. (take ln2=0.693).

two travelling waves Y equal to 0.1 sin3t + 4 pi X and Y = 0.2 sin3t minus 5 by X meet at t = 0 what is the displacement at x is equal to 4.5 at this moment

a converging lens of focal length 30 cm is placed in contact with another converging lens of unknown focal length and the possible value for the focal length of the combination is

If →a1,→b1,→c1 is the reciprocal system of vector triad of →a,→b,→c, then →a.→b1+→b.→c1+→c.→a1=

40.IN A CASE WHERE A POINT CHARGE q IS PLACED AT THE CENTRE OF THE SHELL (METALLIC SPHERICAL SHELLCONTAINING Q CHARGE ON IT). ALSO PLACED IN THE SHELL'S VICINITY IS A POSITIVE CHARGE q1 ; THEN THE ELECTRIC FIELD ON THE INNER CHARGE DUE TO THE METALLIC SPHERE IS NON-ZERO?

31. Two blocks of masses 5 kg and 4 kg are connectedwith ideal string which is passing over an ideal pulleyshown in figure. If the system is released fromrest then the magnitude of acceleration of the blockswill be (Take g= 10 ms 2 and3=1.7)

20. a particle executes linear SHM of period 4second and amplitude 4 cm ,the time taken by it to describe a distance of 1 cm from the extreme position

The magnification of an object placed in front of a convex lens is +2. The focal length of the lens is 2 metres. Find the distance by which object has to be moved to obtain a magnification of -2 (in metres). ___

What are the two conditions for the inter-conversion of states of matter?

Give some methods to increase friction.

In the given figure, the position - time graph of a particle of mass 0.1 kg is shown. The magnitude of impulse at t=2 sec is:

Charge on a capacitor plate during charging is given by Q=Q°(1-e^-t/RC). Where symbol have their casual meaning.sketch graph between q and t.

The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at(IIT-JEE 1980)

The speed v of a particle moving along x-axis is given by, v2=8bx−x2−12b2, where b is a constant. Find amplitude of oscillations. (b = 2 units)

The cofficient of static frictions between a block of mass m and an incline is v=0.3 a what incline with the horizontal so that the block does not slip on the plane

Consider a cylindrical tube of length 240 cm which is closed at one end . It is slowly filled with water such that water in the tube increases at a rate of 2 cm/s. The rate of change of fundamental frequency when the water level in the tube is 120 cm is nearly what?

Shown in the figure, are three waves originating from a point source. Points A,B,C lie on trough while points D,E,F lie on crest of the wave. A wavefront emitting from O may pass through,

The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

One mole of an ideal gas undergoes a process P=P01+(V0V)2. Here, P0 and V0 are constants. Change in temperature of the gas when volume is changed from V=V0 to V=2V0 is

45, Half-cell reaction for a half-cell,Hgl) + 20H' (aq)- HgO(s) + H20(1) + 2e-This half-cell is reversible to(a) H20(l)(c) OH (aq)(b) HgO(s)(d) All are correct

How to solve circuit with nodal analysis ? Some sort of difficult circuit.

if a body is thrown upward and gets vcome back then displace ment velocity is when negetive and positiv

The dimensional formula for coefficient of kinematics viscosity is

The electric energy density in an EM wave is:

Select the correct curve(s). If v = velocity of electron in Bohr's orbit r = Radius of electron n Bohr's orbit P.E = Potential energy of electron in Bohr's orbit K.E = Kinetic energy of electron in Bohr's orbit

Particle 1 of mass m1 collides with a stationary particle 2 of mass m2 elastically. Find the ratio of m2m1, if after collision they move in opposite direction with equal velocities.Assume Head on collision

At what angle of inclination the height of projectile is equal to range of projectile?Explain.

the work function for a metal is 4ev to eject the photo electrons with 0 velocity the wave length of the incident light should

ntIS THERE ANY REASON -THE THRUST FACED DURING UPTHRUST ALWAYS POINT TOWARDS UPWARD DIRECTION AND NOT IN DOWNWARD DIRECTION ?n

For the system shown below, block B is moving upward with an acceleration a. What will be the acceleration of block A, if the string is inextensible and pulleys are frictionless?

extension produced in a wire when a sphere of raduis r attached at its lower end is e.extension produced when sphere is replaced with another sphere of raduis 3r and of same material

125.Find the potential diference across the capacitor in volts? 1)4V 2)2V 3)1V 4)8V .

Match list-I with list-II and select the correct answer using the codes given below the lists: List−IList−II(P)Ecotone(1)Running water(Q)Benthic(2)Replacement of one community(R)Sere(3)Transitional zone between two communities(S)Lotic(4)Zone found at the bottom of the sea

Forbidden energy gap of Ge is 0.75 eV, maximum wavelength of incident radiation for producing electron-hole pair in germanium semiconductor is-[Use h=6.6×10−34 Js]

A rectangular channel 4 m wide shows a wavy surface at a depth of 2.5 m, the rate of discharge in the channel (in m3/sec ) is.49.5

Using a pinhole camera, the image of the following tree is captured.How will the image look?

The angle between vector →A and −2→A is

Current flowing in a circuit having resistance of 30 W and an inductance of (0.4/ π ) H connected to an A.C. supply of 100 V and 50 Hz in series is

What is horizontal motion?

A small block is connected to one end of two identical massless strings of length 1623 cm each with their other ends fixed to a vertical rod. If the ratio of tensions T1T2 is 4:1, then what will be the angular velocity of the block? [Take g=9.8 ms−2].

A charge 'q' is placed at a point exactly above the centre of square (of side a) at a distance a/2. The flux passing through square will be.

The ratio of de Brogile wave length of molcules of hydrogen and helium in two gas jars kept separately at temperatures of 27∘ C and 127∘ C respectively is

The potential energy of a body of mass 3 kg on the surface of a planet is 54 J Its escape velocity will be –

A fish lies at the bottom of a 8 m deep water lake. A bird flies 12 m above the water surface and refractive index of water is 4/3. Then calculate the distance between fish and the image of bird.

A bike is going on a concave upward bridge with a constant velocity v. find the direction of normal(N) and centripetal force when the body reaches middle of the bridge?

Motion under gravity ~ how to make formula