50278 + Interview Questions in Physics

1.	A small body starts falling on to the earth from a distance equal to the radius of the earth's orbit. How long will the body take to reach the sun? Express the time in terms of T, period of revolution of the earth round the sun
Answer» A small body starts falling on to the earth from a distance equal to the radius of the earth's orbit. How long will the body take to reach the sun? Express the time in terms of T, period of revolution of the earth round the sun

Discussion

2.	Height of a body in meters is given by h(t)=10 sin(2πt)+5. Find its height at t=0.25 s.
Answer» Height of a body in meters is given by $h (t) = 10 s i n (2 π t) + 5$ . Find its height at $t = 0.25 s$ .

Discussion

3.	On stretching a wire of Young's modulus Y having original length L by an amount l using a force F, the elastic energy stored per unit volume is
Answer» On stretching a wire of Young's modulus $Y$ having original length $L$ by an amount $l$ using a force $F$ , the elastic energy stored per unit volume is

Discussion

4.	A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be
Answer» A force $F$ is needed to break a copper wire having radius $R$ . The force needed to break a copper wire of radius $2 R$ will be

Discussion

5.	Why is the weight of an object on the moon 16th its weight on the earth? [2 MARK]
Answer» Why is the weight of an object on the moon $\frac{1}{6} t h$ its weight on the earth? [2 MARK]

Discussion

6.	A spring is loaded with two blocks m1 and m2 where m1 is rigidly fixed with the spring and m2 is just kept on the block m1 as shown in the figure. The maximum energy of oscillation that is possible for the system having the block m2 in contact with m1 is
Answer» A spring is loaded with two blocks $m_{1}$ and $m_{2}$ where $m_{1}$ is rigidly fixed with the spring and $m_{2}$ is just kept on the block $m_{1}$ as shown in the figure. The maximum energy of oscillation that is possible for the system having the block $m_{2}$ in contact with $m_{1}$ is

6.

A spring is loaded with two blocks m1 and m2 where m1 is rigidly fixed with the spring and m2 is just kept on the block m1 as shown in the figure. The maximum energy of oscillation that is possible for the system having the block m2 in contact with m1 is

Answer»

A spring is loaded with two blocks $m_{1}$ and $m_{2}$ where $m_{1}$ is rigidly fixed with the spring and $m_{2}$ is just kept on the block $m_{1}$ as shown in the figure. The maximum energy of oscillation that is possible for the system having the block $m_{2}$ in contact with $m_{1}$ is

Discussion

7.	A particle is projected at time t =0 from a point P with a speed v0 at an angle of 45∘ to the horizontal. Find the magnitude and the direction of the angular momentum of the particle about the point P at time t =v0g.
Answer» A particle is projected at time t =0 from a point P with a speed $v_{0}$ at an angle of 45 $^{\circ}$ to the horizontal. Find the magnitude and the direction of the angular momentum of the particle about the point P at time t = $\frac{v_{0}}{g}$ .

Discussion

8.	When the speed of a car is u, the minimum distance over which it can be stopped is s. If the speed becomes nu, what will be the minimum distance over which it can be stopped during same time? Assume the acceleration is constant and same in both cases.
Answer» When the speed of a car is $u$ , the minimum distance over which it can be stopped is $s$ . If the speed becomes $n u$ , what will be the minimum distance over which it can be stopped during same time? Assume the acceleration is constant and same in both cases.

Discussion

9.	What is Doppler effect?
Answer» What is Doppler effect?

Discussion

10.	Two metal strips, each of length l, are elamped parallel to each other on a horizontal floor with a separation b between them. A wire of mass m lies on them perpendicularly as shown in figure (34 - E8). A vertically upward magnetic field of strength B exists in the space. The metal strips are smooth but the coefficient of friction between the wire and the floor is μ, A current i is established when the switch S is closed at the instant t = 0. Discuss the motion of the wire after the switch is closed. How far away from the strips will the wire reach ?
Answer» Two metal strips, each of length l, are elamped parallel to each other on a horizontal floor with a separation b between them. A wire of mass m lies on them perpendicularly as shown in figure (34 - E8). A vertically upward magnetic field of strength B exists in the space. The metal strips are smooth but the coefficient of friction between the wire and the floor is $μ$ , A current i is established when the switch S is closed at the instant t = 0. Discuss the motion of the wire after the switch is closed. How far away from the strips will the wire reach ?

10.

Two metal strips, each of length l, are elamped parallel to each other on a horizontal floor with a separation b between them. A wire of mass m lies on them perpendicularly as shown in figure (34 - E8). A vertically upward magnetic field of strength B exists in the space. The metal strips are smooth but the coefficient of friction between the wire and the floor is μ, A current i is established when the switch S is closed at the instant t = 0. Discuss the motion of the wire after the switch is closed. How far away from the strips will the wire reach ?

Answer»

Two metal strips, each of length l, are elamped parallel to each other on a horizontal floor with a separation b between them. A wire of mass m lies on them perpendicularly as shown in figure (34 - E8). A vertically upward magnetic field of strength B exists in the space. The metal strips are smooth but the coefficient of friction between the wire and the floor is $μ$ , A current i is established when the switch S is closed at the instant t = 0. Discuss the motion of the wire after the switch is closed. How far away from the strips will the wire reach ?

Discussion

11.	A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 rev/s2 is
Answer» A solid cylinder of mass $50 kg$ and radius $0.5 m$ is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of $2 {rev/s}^{2}$ is

Discussion

12.	A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index m = 1.5) making an incidence angle of 60o on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km
Answer» A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index m = 1.5) making an incidence angle of 60^o on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km

Discussion

13.	A car is travelling at a speed of 72 km/hr. Evaluate the value of speed in m/s.
Answer» A car is travelling at a speed of $72 km/hr$ . Evaluate the value of speed in $m/s$ .

Discussion

14.	A bullet of mass 20 g horizontally with a speed of 500 m/s passes through a wooden block of mass 10.0 kg initially at rest on a level surface.The bullet emerges with a speed of 100 m/s and the block slides 20 cm on the surface before coming to rest.Find the friction coefficient between the block and the surface.
Answer» A bullet of mass 20 g horizontally with a speed of 500 m/s passes through a wooden block of mass 10.0 kg initially at rest on a level surface.The bullet emerges with a speed of 100 m/s and the block slides 20 cm on the surface before coming to rest.Find the friction coefficient between the block and the surface.

14.

A bullet of mass 20 g horizontally with a speed of 500 m/s passes through a wooden block of mass 10.0 kg initially at rest on a level surface.The bullet emerges with a speed of 100 m/s and the block slides 20 cm on the surface before coming to rest.Find the friction coefficient between the block and the surface.

Answer»

A bullet of mass 20 g horizontally with a speed of 500 m/s passes through a wooden block of mass 10.0 kg initially at rest on a level surface.The bullet emerges with a speed of 100 m/s and the block slides 20 cm on the surface before coming to rest.Find the friction coefficient between the block and the surface.

Discussion

15.	Velocity of a car as a function of time is given by v(t)=(t3−cost) in m/s. The acceleration in (m/s2) of the car as a function of time t is
Answer» Velocity of a car as a function of time is given by $v (t) = (t^{3} - cos t)$ in $m/s$ . The acceleration in $(m / s^{2})$ of the car as a function of time $t$ is

Discussion

16.	A car travelling at 60 km/h overtakes another car travelling at 42 km/h. Assuming each car to be 5.0 m long, find the time taken during the overtake and the total road distance used for the overtake.
Answer» A car travelling at 60 km/h overtakes another car travelling at 42 km/h. Assuming each car to be 5.0 m long, find the time taken during the overtake and the total road distance used for the overtake.

Discussion

17.	A car starts from rest and moves with uniform acceleration a on a straight road from time t = 0 to t = T. After that, a constant deceleration brings it to rest. In this process the average speed of the car is
Answer» A car starts from rest and moves with uniform acceleration a on a straight road from time t = 0 to t = T. After that, a constant deceleration brings it to rest. In this process the average speed of the car is

Discussion

18.	The equation of a travelling wave is, y=60cos(1800t−6x)), where y is in microns, t in sec and x in metres. The ratio of maximum particle velocity to velocity of wave propagation is
Answer» The equation of a travelling wave is, $y = 60 cos (1800 t - 6 x)),$ where $y$ is in $microns$ , $t$ in $sec$ and $x$ in $metres$ . The ratio of maximum particle velocity to velocity of wave propagation is

Discussion

19.	A small block of mass 200 g is kept at the top of a frictionless incline which is 10 m long and 3.2 in high. How much work was required (a) to lift the block from the ground and put it at the top, (b) to slide the block up the incline ? What will be the speed of the block when it reaches the ground, if (c) it falls off the incline and drops vertically on the ground (d) it slides down the incline ? Take g = 10m/s2.
Answer» A small block of mass 200 g is kept at the top of a frictionless incline which is 10 m long and 3.2 in high. How much work was required (a) to lift the block from the ground and put it at the top, (b) to slide the block up the incline ? What will be the speed of the block when it reaches the ground, if (c) it falls off the incline and drops vertically on the ground (d) it slides down the incline ? Take g = $10 m / s^{2}$ .

Discussion

20.	A projectile is fired horizontally with a velocity of 98 m/s from the top of a hill 490 m high. Find the angle that the line joining the top of the hill and the point on the ground where the projectile hits make with the vertical. (Take g=9.8 ms−2)
Answer» A projectile is fired horizontally with a velocity of $98 m/s$ from the top of a hill $490 m$ high. Find the angle that the line joining the top of the hill and the point on the ground where the projectile hits make with the vertical. (Take $g = 9.8 {ms}^{- 2}$ )

Discussion

21.	The distance of the centre of mass of the T - shaped plate from O is nearly equal to
Answer» The distance of the centre of mass of the T - shaped plate from O is nearly equal to

Discussion

22.	The figure shows two positions A and B at the same height h above the ground. If the maximum height of the projectile is H, then determine the time t elapsed between the positions A and B in terms of H.
Answer» The figure shows two positions A and B at the same height h above the ground. If the maximum height of the projectile is H, then determine the time t elapsed between the positions A and B in terms of H.

Discussion

23.	A particle is projected from horizontal making an angle 60∘ with initial velocity 40 m/s. Find the time taken to the particle to make angle 45∘ from horizontal.
Answer» A particle is projected from horizontal making an angle $60^{\circ}$ with initial velocity 40 m/s. Find the time taken to the particle to make angle $45^{\circ}$ from horizontal.

Discussion

24.	A liquid of mass m is set into oscillations in a U-tube of cross section A. Its time period recorded is T, where T=2π√l/2g and l is the length of the liquid column. If the liquid of same mass is set into oscillations in U-tube of cross-section A/16, then determine time period of oscillation.
Answer» A liquid of mass $m$ is set into oscillations in a U-tube of cross section $A$ . Its time period recorded is $T$ , where $T = 2 π \sqrt{l / 2 g}$ and $l$ is the length of the liquid column. If the liquid of same mass is set into oscillations in U-tube of cross-section $A / 16$ , then determine time period of oscillation.

Discussion

25.	Consider the following complexes. (i) [Cr(EDTA)]− (ii) [Ru(en)3]2+ (iii) [Pt(gly)2Cl2]−2 (iv) Cis−[Cr(Cl)2(ox)2]3− (v) trans - [Pt(en)(NH3)2(py)2]4+ Then find out the value of expression \|p+q\|2 p=total number of optically active complexes q=total number of optically inactive complexes
Answer» Consider the following complexes. (i) $[C r (E D T A)]^{-}$ (ii) $[R u (e n)_{3}]^{2 +}$ (iii) $[P t (g l y)_{2} C l_{2}]^{- 2}$ (iv) $C i s - [C r (C l)_{2} (o x)_{2}]^{3 -}$ (v) trans - $[P t (e n) (N H_{3})_{2} (p y)_{2}]^{4 +}$ Then find out the value of expression $\| p + q \|^{2}$ $p = total number of optically active complexes$ $q = total number of optically inactive complexes$

Discussion

26.	In the coming years, skin cancer will be more common due to:
Answer» In the coming years, skin cancer will be more common due to:

Discussion

27.	The radius of the circle whose arc of length 15πcm makes an angle of 3π4 radian at the centre is
Answer» The radius of the circle whose arc of length $15 π$ cm makes an angle of $\frac{3 π}{4}$ radian at the centre is

Discussion

28.	What is the de broglie wavenlength of a neutron with kinetic enrgy of 150eV
Answer» What is the de broglie wavenlength of a neutron with kinetic enrgy of 150eV

Discussion

29.	A refrigerator uses 400 J of work to remove 200 J of heat from its contents. How much heat must it reject to its surroundings?
Answer» A refrigerator uses 400 J of work to remove 200 J of heat from its contents. How much heat must it reject to its surroundings?

Discussion

30.	The total energy of an electron in an atom in an orbit is −3.4 eV. Its kinetic and potential energies are, respectively
Answer» The total energy of an electron in an atom in an orbit is $- 3.4 e V$ . Its kinetic and potential energies are, respectively

Discussion

31.	During the equilibrium reaction between ice and water,at equilibrium both forward and reverse reaction takes place simultataneously such that rate of melting = rate of crystallisation. But at equilibrium,does the shape of ice changes?
Answer» During the equilibrium reaction between ice and water,at equilibrium both forward and reverse reaction takes place simultataneously such that rate of melting = rate of crystallisation. But at equilibrium,does the shape of ice changes?

Discussion

32.	The radioactivity of a sample is X at time t1 and Y and a time t2. If the mean life time of the specimen is τ, the number of atoms that have disintigrated in the time interval t1−t2 is
Answer» The radioactivity of a sample is X at time $t_{1}$ and Y and a time $t_{2}$ . If the mean life time of the specimen is $τ$ , the number of atoms that have disintigrated in the time interval $t_{1} - t_{2}$ is

Discussion

33.	In the given figure all the surfaces are smooth. Find the time taken by the block to reach from the free end to the pulley attached to the plank. Distance between free end and pulley is l.
Answer» In the given figure all the surfaces are smooth. Find the time taken by the block to reach from the free end to the pulley attached to the plank. Distance between free end and pulley is l.

Discussion

34.	Find the altitude at which the all due tu gravity is 25% of that at the surface of the earth (6400)
Answer» Find the altitude at which the all due tu gravity is 25% of that at the surface of the earth (6400)

Discussion

35.	A force of 5 kg – wt is acting on a body of mass 5 kg kept on a smooth horizontal surface at rest. If it acts for 10 seconds at an angle of 60∘ with the horizontal, find the distance travelled by it along the surface (Take g=10 m/s2)
Answer» A force of $5 kg - wt$ is acting on a body of mass $5 kg$ kept on a smooth horizontal surface at rest. If it acts for $10$ seconds at an angle of $60^{\circ}$ with the horizontal, find the distance travelled by it along the surface (Take $g = 10 {m/s}^{2}$ )

Discussion

36.	A uniform rod of mass M and length L is pivoted at one end such that it can rotate in a vertical plane. There is negligible friction at the pivot. The free end of the rod is held vertically above the pivot and then released. The angular acceleration of the rod when it makes an angle θ with the vertical is:
Answer» A uniform rod of mass $M$ and length $L$ is pivoted at one end such that it can rotate in a vertical plane. There is negligible friction at the pivot. The free end of the rod is held vertically above the pivot and then released. The angular acceleration of the rod when it makes an angle $θ$ with the vertical is:

Discussion

37.	A block of mass 5 kg is placed on a rough horizontal surface of a moving compartment. It is seen by an observer sitting inside the compartment, that a force of 20 N is required in horizontal direction to move the box in a direction parallel to the motion of compartment, while a force of 10 N is required in horizontal direction to move the box in opposite direction. If coefficient of friction between the surface of the block and the surface is x10, then find out value of x. (Take g=10 ms−2)
Answer» A block of mass $5 kg$ is placed on a rough horizontal surface of a moving compartment. It is seen by an observer sitting inside the compartment, that a force of $20 N$ is required in horizontal direction to move the box in a direction parallel to the motion of compartment, while a force of $10 N$ is required in horizontal direction to move the box in opposite direction. If coefficient of friction between the surface of the block and the surface is $\frac{x}{10}$ , then find out value of $x$ . (Take $g = 10 {ms}^{- 2}$ )

Discussion

38.	A stone dropped from topof a building of height h and it reaches after t seconds on Earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then
Answer» A stone dropped from topof a building of height h and it reaches after t seconds on Earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after $t_{1}$ and $t_{2}$ seconds respectively, then

Discussion

39.	A, B, C, D are the points in a vertical line, the lengths AB=BC=CD . If the body Falls from rest at A , prove that the times of describing AB, BC, CD are as 1:√2-√1:√3-√2 .
Answer» A, B, C, D are the points in a vertical line, the lengths AB=BC=CD . If the body Falls from rest at A , prove that the times of describing AB, BC, CD are as 1:√2-√1:√3-√2 .

Discussion

40.	Can human body act as a magnet ...if yes then can gravitational force be changed with the term of magnetic attractions acting on our body ..
Answer» Can human body act as a magnet ...if yes then can gravitational force be changed with the term of magnetic attractions acting on our body ..

Discussion

41.	A bullet of mass 5g is shot from a gun of mass 5kg . The muzzle velocity of the bullet is 500m/s .What is the recoil velocity of the gun?
Answer» A bullet of mass 5g is shot from a gun of mass 5kg . The muzzle velocity of the bullet is 500m/s .What is the recoil velocity of the gun?

Discussion

42.	The. Vernier scale of an instrument has 50 divisions which coincides with 49 main scale divisions ..if each main scale division Is 0.5 mm then using this instrument the minimum inaccuracy in the measurement of distance is Ans is. 0.01mm
Answer» The. Vernier scale of an instrument has 50 divisions which coincides with 49 main scale divisions ..if each main scale division Is 0.5 mm then using this instrument the minimum inaccuracy in the measurement of distance is Ans is. 0.01mm

Discussion

43.	A hollow sphere of radius 2 m is projected horizontally along a rough surface with velocity v0 and angular velocity ω0. Find out their ratio so that the sphere stops moving after some time.
Answer» A hollow sphere of radius $2 m$ is projected horizontally along a rough surface with velocity $v_{0}$ and angular velocity $ω_{0}$ . Find out their ratio so that the sphere stops moving after some time.

Discussion

44.	Three particles, each having a charge of 10 micro coulomb are placed at the vertices of an equilateral triangle of side 10cm. Find the work done by a person in pulling them apart to infinite separations .
Answer» Three particles, each having a charge of 10 micro coulomb are placed at the vertices of an equilateral triangle of side 10cm. Find the work done by a person in pulling them apart to infinite separations .

Discussion

45.	A sample of mono-atomic ideal gas is taken through a cyclic process ABCDA. A graph is plotted in which heat exchanged by the gas upto an instant is shown on x - axis and work done by the gas upto that instant is shown on y - axis. The given cyclic process can be represented on a pressure - volume graph as
Answer» A sample of mono-atomic ideal gas is taken through a cyclic process ABCDA. A graph is plotted in which heat exchanged by the gas upto an instant is shown on x - axis and work done by the gas upto that instant is shown on y - axis. The given cyclic process can be represented on a pressure - volume graph as

Discussion

46.	In an instrument, there are 25 divisions on the vernier scale which coincides with 24th division of the main scale. 1 cm on main scale is divided into 20 equal parts. The least count of the instrument is
Answer» In an instrument, there are 25 divisions on the vernier scale which coincides with 24th division of the main scale. 1 cm on main scale is divided into 20 equal parts. The least count of the instrument is

Discussion

47.	Electromagnetic waves of wavelength 500 nm are incident on a YDSE apparatus. Both slits of the apparatus are of the same width. Given d=3 mm, D=2 m. Intensity at the central maxima is 1 W/m2. The intensity in ( W/m2) at a point 1 mm above maxima of 1st order is
Answer» Electromagnetic waves of wavelength $500 n m$ are incident on a YDSE apparatus. Both slits of the apparatus are of the same width. Given $d = 3 m m$ , $D = 2 m$ . Intensity at the central maxima is $1 W / m^{2}$ . The intensity in $(W / m^{2})$ at a point $1 m m$ above maxima of 1st order is

Discussion

48.	A 2μF capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch S is turned to position 2 is (The 8μF capacitor is initially uncharged)
Answer» A $2 μ F$ capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch S is turned to position 2 is (The $8 μ F$ capacitor is initially uncharged)

Discussion

49.	It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is pd, while for its similar collision with carbon nucleus at rest, fractional loss of energy is pcThe values of pd and pc are respectively :
Answer» It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is $p_{d}$ , while for its similar collision with carbon nucleus at rest, fractional loss of energy is $p_{c}$ The values of $p_{d}$ and $p_{c}$ are respectively :

Discussion

50.	The force of repulsion between two point charges is F, when they are d distance apart if the point charges are replaced by conducting spheres each of radius R and charges remain same the separation between the centre of the sphere d then the force of repulsion between them is Equal to f Less than f Greater than f
Answer» The force of repulsion between two point charges is F, when they are d distance apart if the point charges are replaced by conducting spheres each of radius R and charges remain same the separation between the centre of the sphere d then the force of repulsion between them is Equal to f Less than f Greater than f

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A small body starts falling on to the earth from a distance equal to the radius of the earth's orbit. How long will the body take to reach the sun? Express the time in terms of T, period of revolution of the earth round the sun

Height of a body in meters is given by h(t)=10 sin(2πt)+5. Find its height at t=0.25 s.

On stretching a wire of Young's modulus Y having original length L by an amount l using a force F, the elastic energy stored per unit volume is

A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be

Why is the weight of an object on the moon 16th its weight on the earth? [2 MARK]

A spring is loaded with two blocks m1 and m2 where m1 is rigidly fixed with the spring and m2 is just kept on the block m1 as shown in the figure. The maximum energy of oscillation that is possible for the system having the block m2 in contact with m1 is

A particle is projected at time t =0 from a point P with a speed v0 at an angle of 45∘ to the horizontal. Find the magnitude and the direction of the angular momentum of the particle about the point P at time t =v0g.

When the speed of a car is u, the minimum distance over which it can be stopped is s. If the speed becomes nu, what will be the minimum distance over which it can be stopped during same time? Assume the acceleration is constant and same in both cases.

What is Doppler effect?

A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 rev/s2 is

A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index m = 1.5) making an incidence angle of 60o on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km ​

A car is travelling at a speed of 72 km/hr. Evaluate the value of speed in m/s.

Velocity of a car as a function of time is given by v(t)=(t3−cost) in m/s. The acceleration in (m/s2) of the car as a function of time t is

A car travelling at 60 km/h overtakes another car travelling at 42 km/h. Assuming each car to be 5.0 m long, find the time taken during the overtake and the total road distance used for the overtake.

A car starts from rest and moves with uniform acceleration a on a straight road from time t = 0 to t = T. After that, a constant deceleration brings it to rest. In this process the average speed of the car is

The equation of a travelling wave is, y=60cos(1800t−6x)), where y is in microns, t in sec and x in metres. The ratio of maximum particle velocity to velocity of wave propagation is

A projectile is fired horizontally with a velocity of 98 m/s from the top of a hill 490 m high. Find the angle that the line joining the top of the hill and the point on the ground where the projectile hits make with the vertical. (Take g=9.8 ms−2)

The distance of the centre of mass of the T - shaped plate from O is nearly equal to

The figure shows two positions A and B at the same height h above the ground. If the maximum height of the projectile is H, then determine the time t elapsed between the positions A and B in terms of H.

A particle is projected from horizontal making an angle 60∘ with initial velocity 40 m/s. Find the time taken to the particle to make angle 45∘ from horizontal.

A liquid of mass m is set into oscillations in a U-tube of cross section A. Its time period recorded is T, where T=2π√l/2g and l is the length of the liquid column. If the liquid of same mass is set into oscillations in U-tube of cross-section A/16, then determine time period of oscillation.

Consider the following complexes. (i) [Cr(EDTA)]− (ii) [Ru(en)3]2+ (iii) [Pt(gly)2Cl2]−2 (iv) Cis−[Cr(Cl)2(ox)2]3− (v) trans - [Pt(en)(NH3)2(py)2]4+ Then find out the value of expression |p+q|2 p=total number of optically active complexes q=total number of optically inactive complexes

In the coming years, skin cancer will be more common due to:

The radius of the circle whose arc of length 15πcm makes an angle of 3π4 radian at the centre is

What is the de broglie wavenlength of a neutron with kinetic enrgy of 150eV

A refrigerator uses 400 J of work to remove 200 J of heat from its contents. How much heat must it reject to its surroundings?

The total energy of an electron in an atom in an orbit is −3.4 eV. Its kinetic and potential energies are, respectively

During the equilibrium reaction between ice and water,at equilibrium both forward and reverse reaction takes place simultataneously such that rate of melting = rate of crystallisation. But at equilibrium,does the shape of ice changes?

The radioactivity of a sample is X at time t1 and Y and a time t2. If the mean life time of the specimen is τ, the number of atoms that have disintigrated in the time interval t1−t2 is

In the given figure all the surfaces are smooth. Find the time taken by the block to reach from the free end to the pulley attached to the plank. Distance between free end and pulley is l.

Find the altitude at which the all due tu gravity is 25% of that at the surface of the earth (6400)

A force of 5 kg – wt is acting on a body of mass 5 kg kept on a smooth horizontal surface at rest. If it acts for 10 seconds at an angle of 60∘ with the horizontal, find the distance travelled by it along the surface (Take g=10 m/s2)

A stone dropped from topof a building of height h and it reaches after t seconds on Earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then

A, B, C, D are the points in a vertical line, the lengths AB=BC=CD . If the body Falls from rest at A , prove that the times of describing AB, BC, CD are as 1:√2-√1:√3-√2 .

Can human body act as a magnet ...if yes then can gravitational force be changed with the term of magnetic attractions acting on our body ..

A bullet of mass 5g is shot from a gun of mass 5kg . The muzzle velocity of the bullet is 500m/s .What is the recoil velocity of the gun?

The. Vernier scale of an instrument has 50 divisions which coincides with 49 main scale divisions ..if each main scale division Is 0.5 mm then using this instrument the minimum inaccuracy in the measurement of distance is Ans is. 0.01mm

A hollow sphere of radius 2 m is projected horizontally along a rough surface with velocity v0 and angular velocity ω0. Find out their ratio so that the sphere stops moving after some time.

Three particles, each having a charge of 10 micro coulomb are placed at the vertices of an equilateral triangle of side 10cm. Find the work done by a person in pulling them apart to infinite separations .

In an instrument, there are 25 divisions on the vernier scale which coincides with 24th division of the main scale. 1 cm on main scale is divided into 20 equal parts. The least count of the instrument is

Electromagnetic waves of wavelength 500 nm are incident on a YDSE apparatus. Both slits of the apparatus are of the same width. Given d=3 mm, D=2 m. Intensity at the central maxima is 1 W/m2. The intensity in ( W/m2) at a point 1 mm above maxima of 1st order is

A 2μF capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch S is turned to position 2 is (The 8μF capacitor is initially uncharged)

It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is pd, while for its similar collision with carbon nucleus at rest, fractional loss of energy is pcThe values of pd and pc are respectively :

A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index m = 1.5) making an incidence angle of 60o on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km