50278 + Interview Questions in Physics

1.	An object is placed between two plane parallel mirrors. Why do the distant images get fainter and fainter?
Answer» An object is placed between two plane parallel mirrors. Why do the distant images get fainter and fainter?

Discussion

2.	The normal activity of living carbon-containing matter is found tobe about 15 decays per minute for every gram of carbon. This activityarises from the small proportion of radioactive 146 C present with thestable carbon isotope 126 C . When the organism is dead, its interactionwith the atmosphere (which maintains the above equilibrium activity)ceases and its activity begins to drop. From the known half-life (5730years) of 146 C , and the measured activity, the age of the specimencan be approximately estimated. This is the principle of 146C dating used in archaeology. Suppose a specimen from Mohenjodaro givesan activity of 9 decays per minute per gram of carbon. Estimate theapproximate age of the Indus-Valley civilisation.
Answer» The normal activity of living carbon-containing matter is found tobe about 15 decays per minute for every gram of carbon. This activityarises from the small proportion of radioactive 146 C present with thestable carbon isotope 126 C . When the organism is dead, its interactionwith the atmosphere (which maintains the above equilibrium activity)ceases and its activity begins to drop. From the known half-life (5730years) of 146 C , and the measured activity, the age of the specimencan be approximately estimated. This is the principle of 146C dating used in archaeology. Suppose a specimen from Mohenjodaro givesan activity of 9 decays per minute per gram of carbon. Estimate theapproximate age of the Indus-Valley civilisation.

Discussion

3.	A body weighs 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth ?
Answer» A body weighs 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth ?

Discussion

4.	A simple harmonic wave is represented by the relation y(x,t)=a0 sin 2π(vt−xλ) If the maximum particle velocity is three times the wave velocity, the wavelength λ of the wave is
Answer» A simple harmonic wave is represented by the relation $y (x, t) = a_{0} s i n 2 π (v t - \frac{x}{λ})$ If the maximum particle velocity is three times the wave velocity, the wavelength $λ$ of the wave is

Discussion

5.	8.) A disc of mass1 kg and radius 0.1 m is rotating with angular velocity 20 rad/s. What is angular velocitymass of 0.5 kg is put on the circumference of the disc?(in rad/s) if a(1) 10(3) 40(2) 20(4) 30
Answer» 8.) A disc of mass1 kg and radius 0.1 m is rotating with angular velocity 20 rad/s. What is angular velocitymass of 0.5 kg is put on the circumference of the disc?(in rad/s) if a(1) 10(3) 40(2) 20(4) 30

Discussion

6.	A wire is stretched between two fixed points separated by a distance of 2 m such that tension in it is equal to 30.25 kgwt. The wire vibrates in its first overtone. A closed organ pipe of length 53 m brought near the wire. The temperature of the gas in the pipe is 27∘C. When the organ pipe is made to vibrate in second overtone, five beats are heard every second. If the tension in the string is reduced slightly then the number of beats heard per second is reduced to three. Find the linear (mass) density of the wire in gram/metre. Given CPCv of gas in the organ pipe = 1.44 and its mean molar mass is 27.7 gm. Take the speed of sound as the nearest multiple of 10.
Answer» A wire is stretched between two fixed points separated by a distance of 2 m such that tension in it is equal to $30.25 kgwt$ . The wire vibrates in its first overtone. A closed organ pipe of length $\frac{5}{3} m$ brought near the wire. The temperature of the gas in the pipe is $27^{\circ} C$ . When the organ pipe is made to vibrate in second overtone, five beats are heard every second. If the tension in the string is reduced slightly then the number of beats heard per second is reduced to three. Find the linear (mass) density of the wire in gram/metre. Given $\frac{C_{P}}{C_{v}}$ of gas in the organ pipe = 1.44 and its mean molar mass is $27.7 gm$ . Take the speed of sound as the nearest multiple of 10.

Discussion

7.	The number of photons of light having wavelength 100 nm which can provide 1 J energy is nearly
Answer» The number of photons of light having wavelength 100 nm which can provide 1 J energy is nearly

Discussion

8.	A 200 × 100 × 50 mm steel block is subjected to a hydorstatic pressure of 15 MPa. The Young's modulus and Poisson's ratio of the material are 200 GPa and 0.3 respectively. The change in the volume of the block in mm3 is
Answer» A $200 \times 100 \times 50 m m$ steel block is subjected to a hydorstatic pressure of $15 M P a .$ The Young's modulus and Poisson's ratio of the material are $200 G P a$ and 0.3 respectively. The change in the volume of the block in $m m^{3}$ is

Discussion

9.	Two positive charges (+10 C) are kept on the arc of a circle and a negative charge (−20 C) at the origin (centre of circle). Find the magnitude of net dipole moment for the given system.
Answer» Two positive charges $(+ 10 C)$ are kept on the arc of a circle and a negative charge $(- 20 C)$ at the origin (centre of circle). Find the magnitude of net dipole moment for the given system.

Discussion

10.	A point charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance of R from the centre of the shell. The electric potential at the centre of shell will be 14πϵ0 times:
Answer» A point charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance of R from the centre of the shell. The electric potential at the centre of shell will be $\frac{1}{4 π ϵ_{0}}$ times:

Discussion

11.	Thalami Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?
Answer» Thalami Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?

Discussion

12.	A satellite is orbiting very close to the surface of earth. A particle is to be projected from the satellite to just escape from the gravitational field of earth. The escape speed from the earth is ve. The speed of particle with respect to satelliteWill be less than veWill be more than veWill be equal to veShould have chosen Will depend on direction of projection
Answer» A satellite is orbiting very close to the surface of earth. A particle is to be projected from the satellite to just escape from the gravitational field of earth. The escape speed from the earth is ve. The speed of particle with respect to satellite Will be less than ve Will be more than ve Will be equal to ve Should have chosen Will depend on direction of projection

Discussion

13.	A rod of length 2.4 m and mass 6 kg is bent to form a regular hexagon. Find the moment of inertia of the hexagon about the axis perpendicular to the plane of hexagon passing through its centre.
Answer» A rod of length $2.4 m$ and mass $6 kg$ is bent to form a regular hexagon. Find the moment of inertia of the hexagon about the axis perpendicular to the plane of hexagon passing through its centre.

Discussion

14.	In the previous problem, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury = 13.6)
Answer» In the previous problem, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury = 13.6)

Discussion

15.	A charge q is placed in the middle of a line joining the two equal and like point charges Q. This system will remain in equilibrum for which the value of q is-
Answer» A charge $q$ is placed in the middle of a line joining the two equal and like point charges $Q$ . This system will remain in equilibrum for which the value of $q$ is-

Discussion

16.	A body moving along a straight line with uniform acceleration, starts from point O and through points A, B, C and D at distances x1, x2, x3 and x4 from O. It covers distances AB, BC and CD in equal intervals of time. Then (x4 - x1) is equal to
Answer» A body moving along a straight line with uniform acceleration, starts from point O and through points A, B, C and D at distances x₁, x₂, x₃ and x₄ from O. It covers distances AB, BC and CD in equal intervals of time. Then (x₄- x₁) is equal to

Discussion

17.	A train is moving towards north. At one place it turns towards north-east, here we observe that
Answer» A train is moving towards north. At one place it turns towards north-east, here we observe that

Discussion

18.	65. An object of specific gravity p is hung from a mass less string. The tension in string is T.The object is immersed in water so that one half of its volume is submerged. The new tension in the string is?
Answer» 65. An object of specific gravity p is hung from a mass less string. The tension in string is T.The object is immersed in water so that one half of its volume is submerged. The new tension in the string is?

Discussion

19.	In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150 °C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cm3 of water at 27 °C. The final temperature is 40 °C. Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal ?
Answer» In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150 °C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cm3 of water at 27 °C. The final temperature is 40 °C. Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal ?

Discussion

20.	Total energy of a harmonic oscillator of mass 2 kg is 9 J and its potential energy at mean position is5 J. Its amplitude is 0.01 m, its angular frequencywill be(1) 102 rad/s(3) 2 x 102 rad/s(2) V2x10 rad/s(4) 4 x 102 rad/s
Answer» Total energy of a harmonic oscillator of mass 2 kg is 9 J and its potential energy at mean position is5 J. Its amplitude is 0.01 m, its angular frequencywill be(1) 102 rad/s(3) 2 x 102 rad/s(2) V2x10 rad/s(4) 4 x 102 rad/s

Discussion

21.	Name the type of magnet which is formed when subjected to an electric current.
Answer» Name the type of magnet which is formed when subjected to an electric current.

Discussion

22.	Monochromatic light of wavelength 3000 ˙A is incident on a surface area 4 cm2. If the intensity of light is 150 mW/m2, then the rate at which photons strike the target is
Answer» Monochromatic light of wavelength $3000 ˙ A$ is incident on a surface area $4 {cm}^{2}$ . If the intensity of light is $150 {mW/m}^{2}$ , then the rate at which photons strike the target is

Discussion

23.	A is a set containing 10 elements. A subset P1 of A is formed and the set A is reconstructed by replacing all its elements. Again a subset P2 is formed and the set A is reconstructed. Similarly 10 subsets upto P10 are formed. Find the probability that "Pi intersection Pj = φ for all i≠j"
Answer» A is a set containing 10 elements. A subset P1 of A is formed and the set A is reconstructed by replacing all its elements. Again a subset P2 is formed and the set A is reconstructed. Similarly 10 subsets upto P10 are formed. Find the probability that "Pi intersection Pj = φ for all i≠j"

Discussion

24.	a segment of wirevibrates with fundamental frequency 400hz under a tension of 8kg. the tension at which the fundamental frequency of same wire becomes 800hz
Answer» a segment of wirevibrates with fundamental frequency 400hz under a tension of 8kg. the tension at which the fundamental frequency of same wire becomes 800hz

Discussion

25.	The position of a moving particle is given by equation x=(t^2+3t-5)m, then displacement of particle between t=1 second to t=2 second is 1)+4m 2)-4m 3)-6m 4)6m
Answer» The position of a moving particle is given by equation x=(t^2+3t-5)m, then displacement of particle between t=1 second to t=2 second is 1)+4m 2)-4m 3)-6m 4)6m

Discussion

26.	what is meant by potential energy of atom?
Answer» what is meant by potential energy of atom?

Discussion

27.	A heavy particle is projected with a velocity at an angle with the horizontal into a uniform gravitational field. The slope of the trajectory cannot be represented by which of the following curves?
Answer» A heavy particle is projected with a velocity at an angle with the horizontal into a uniform gravitational field. The slope of the trajectory cannot be represented by which of the following curves?

Discussion

28.	The image formed by the objective of a compound microscope is
Answer» The image formed by the objective of a compound microscope is

Discussion

29.	Calculate the momentum of a photon of light of wavelength 500 nm.
Answer» Calculate the momentum of a photon of light of wavelength 500 nm.

Discussion

30.	A glass capillary tube is of the shape of truncated cone with an apex angle α, so that its two ends have cross-sections of different radii. When dipped in water vertically, water rises in it to a height h, where the radius of its cross-section is b. If the surface tension of water is S, its density is ρ, and its contact angle with glass is θ. the value of h will be (g is the acceleration due to gravity).
Answer» A glass capillary tube is of the shape of truncated cone with an apex angle $α$ , so that its two ends have cross-sections of different radii. When dipped in water vertically, water rises in it to a height $h$ , where the radius of its cross-section is $b$ . If the surface tension of water is $S$ , its density is $ρ,$ and its contact angle with glass is $θ .$ the value of $h$ will be ( $g$ is the acceleration due to gravity).

Discussion

31.	Why Cathode rays get deflected in presence of magnetic field?
Answer» Why Cathode rays get deflected in presence of magnetic field?

Discussion

32.	An ideal engine has an efficiency of 112. When the temperature of sink is reduced by 70∘C, its efficiency gets doubled. The temperature of the source is
Answer» An ideal engine has an efficiency of $\frac{1}{12}$ . When the temperature of sink is reduced by $70^{\circ} C$ , its efficiency gets doubled. The temperature of the source is

Discussion

33.	The kinetic energy required to project a body of mass m from earth's surface (radius R) to just escape from earth's atmosphere
Answer» The kinetic energy required to project a body of mass $m$ from earth's surface (radius $R$ ) to just escape from earth's atmosphere

Discussion

34.	A distance of 2000m was measured by 20m chain, Later on it was detected that the chain was 0.1 m too long. Another 1000m (i.e. total 3000 m) was measured and it was detected that the chain was 0.20 m too long. If the length of the chain in the initial stage was correct, then the exact length that was measured is __________.(Report the answer in m, correct upto two decimal places)3012.5
Answer» A distance of 2000m was measured by 20m chain, Later on it was detected that the chain was 0.1 m too long. Another 1000m (i.e. total 3000 m) was measured and it was detected that the chain was 0.20 m too long. If the length of the chain in the initial stage was correct, then the exact length that was measured is __________. (Report the answer in m, correct upto two decimal places) 3012.5

Discussion

35.	The maximum and minimum distances of a comet from the sun are 1.6×1012 m and 8.0×1010 m respectively. If the speed of the comet at the nearest point is 6×104 ms−1, the speed at the farthest point is:
Answer» The maximum and minimum distances of a comet from the sun are $1.6 \times 10^{12} m$ and $8.0 \times 10^{10} m$ respectively. If the speed of the comet at the nearest point is $6 \times 10^{4} {ms}^{- 1}$ , the speed at the farthest point is:

Discussion

36.	A solid sphere and solid cylinder of identical radii approach an incline with the same linear velocity (see figure). Both roll without slipping all throughout. The two climb maximum heights hsph and hcyl on the incline. The ratio hsphhcyl is given by
Answer» A solid sphere and solid cylinder of identical radii approach an incline with the same linear velocity (see figure). Both roll without slipping all throughout. The two climb maximum heights $h_{sph}$ and $h_{cyl}$ on the incline. The ratio $\frac{h_{sph}}{h_{cyl}}$ is given by

Discussion

37.	Assertion : No work is done by a force on an object when the point of application of the force does not move.Reason : A small block of mass m is kept on a rough inclined surface of inclination a fixed in an elevator. The elevator goes up with a uniform velocity u and the block does not slide on the wedge.Then the work done by the force of friction on the block in time t will be mgutsin2a.(3) C(4) D
Answer» Assertion : No work is done by a force on an object when the point of application of the force does not move.Reason : A small block of mass m is kept on a rough inclined surface of inclination a fixed in an elevator. The elevator goes up with a uniform velocity u and the block does not slide on the wedge.Then the work done by the force of friction on the block in time t will be mgutsin2a.(3) C(4) D

Discussion

38.	A person of mass 60 kg inside a lift of mass 940 kg presses the button on control panel. The lift starts moving upwards with an acceleration of 1 m/s2. If g=10 m/s2 , the tension in the supporting cable is
Answer» A person of mass $60 k g$ inside a lift of mass $940 k g$ presses the button on control panel. The lift starts moving upwards with an acceleration of 1 $m / s^{2}$ . If $g = 10 m / s^{2}$ , the tension in the supporting cable is

Discussion

39.	A point mass mA is connected to a point mass mB by a massless rod of length las shown in the figure. It is observed that the ratio of the moment of inertia of the system about the two axes BB and AA, which is parallel to each other and perpendicular to the rod is IBBIAA=3 . The distance of the centre of mass of the system from the mass A is
Answer» A point mass m_A is connected to a point mass mB by a massless rod of length las shown in the figure. It is observed that the ratio of the moment of inertia of the system about the two axes BB and AA, which is parallel to each other and perpendicular to the rod is $\frac{I_{B B}}{I_{A A}} = 3$ . The distance of the centre of mass of the system from the mass A is

39.

A point mass mA is connected to a point mass mB by a massless rod of length las shown in the figure. It is observed that the ratio of the moment of inertia of the system about the two axes BB and AA, which is parallel to each other and perpendicular to the rod is IBBIAA=3 . The distance of the centre of mass of the system from the mass A is

Answer»

A point mass m_A is connected to a point mass mB by a massless rod of length las shown in the figure. It is observed that the ratio of the moment of inertia of the system about the two axes BB and AA, which is parallel to each other and perpendicular to the rod is $\frac{I_{B B}}{I_{A A}} = 3$ . The distance of the centre of mass of the system from the mass A is

Discussion

40.	A school building is 42 m long and 20 m high. A student throws a cricket ball, from a point x m away from the base of building as shown in the figure. The ball just clears the front and back tops of the building. If the time of flight is 5 s, then the value of x is
Answer» A school building is 42 m long and 20 m high. A student throws a cricket ball, from a point x m away from the base of building as shown in the figure. The ball just clears the front and back tops of the building. If the time of flight is 5 s, then the value of x is

Discussion

41.	A. Would you mind if I sit down. B. On entering the room, Ram was found hanging from the ceiling. C. If he was here now, we would have had no difficulty. D. He had to fight at odds with him.
Answer» A. Would you mind if I sit down. B. On entering the room, Ram was found hanging from the ceiling. C. If he was here now, we would have had no difficulty. D. He had to fight at odds with him.

Discussion

42.	A roller coaster is travelling on a flat track with a minimum radius of curvature of 15 m and the train car has a maximum velocity of 15 m/s. What should be the friction coefficient between the train car and the track for the ride to be safe? (g=10 m/s2)
Answer» A roller coaster is travelling on a flat track with a minimum radius of curvature of $15 m$ and the train car has a maximum velocity of $15 m/s$ . What should be the friction coefficient between the train car and the track for the ride to be safe? $(g = 10 {m/s}^{2})$

Discussion

43.	A car moving with a velocity of 10 m/s can be stopped by the application of a constant force F in a distance of 20 m. If the velocity of the car is 30 m/s, it can be stopped by this force in
Answer» A car moving with a velocity of $10 m/s$ can be stopped by the application of a constant force $F$ in a distance of $20 m$ . If the velocity of the car is $30 m/s$ , it can be stopped by this force in

Discussion

44.	The charge flowing through a resistance R varies with time as Q=2t−8t2. The total heat produced (in joules) in the resistance is(for 0≤t≤18 s)
Answer» The charge flowing through a resistance $R$ varies with time as $Q = 2 t - 8 t^{2}$ . The total heat produced (in joules) in the resistance is $(for 0 \leq t \leq \frac{1}{8} s)$

Discussion

45.	Which of the following is true for the figure showing electric lines of force? (E is Electrical field and V is potential)
Answer» Which of the following is true for the figure showing electric lines of force? ( $E$ is Electrical field and $V$ is potential)

Discussion

46.	An electron is moving towards x-axis. An electric field is along y-direction then path of electron is
Answer» An electron is moving towards x-axis. An electric field is along y-direction then path of electron is

Discussion

47.	mobile sea of electrons is responsible for malleability,ductility,metallic lustre.explai
Answer» mobile sea of electrons is responsible for malleability,ductility,metallic lustre.explai

Discussion

48.	38. a bivalent metal has the equivalent weight 12. The molecular weight of its oxide will be
Answer» 38. a bivalent metal has the equivalent weight 12. The molecular weight of its oxide will be

Discussion

49.	If IA=π/4∫0(√tanx+√cotx)dx and IB=π/4∫0cosx√cos2xdx, then IAIB=
Answer» If $I_{A} = π / 4 \int 0 (\sqrt{tan x} + \sqrt{cot x}) d x$ and $I_{B} = π / 4 \int 0 \frac{cos x}{\sqrt{cos 2 x}} d x,$ then $\frac{I_{A}}{I_{B}} =$

Discussion

50.	Units of work and energy and their interconversions
Answer» Units of work and energy and their interconversions

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

An object is placed between two plane parallel mirrors. Why do the distant images get fainter and fainter?

A body weighs 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth ?

A simple harmonic wave is represented by the relation y(x,t)=a0 sin 2π(vt−xλ) If the maximum particle velocity is three times the wave velocity, the wavelength λ of the wave is

8.) A disc of mass1 kg and radius 0.1 m is rotating with angular velocity 20 rad/s. What is angular velocitymass of 0.5 kg is put on the circumference of the disc?(in rad/s) if a(1) 10(3) 40(2) 20(4) 30

The number of photons of light having wavelength 100 nm which can provide 1 J energy is nearly

A 200 × 100 × 50 mm steel block is subjected to a hydorstatic pressure of 15 MPa. The Young's modulus and Poisson's ratio of the material are 200 GPa and 0.3 respectively. The change in the volume of the block in mm3 is

Two positive charges (+10 C) are kept on the arc of a circle and a negative charge (−20 C) at the origin (centre of circle). Find the magnitude of net dipole moment for the given system.

A point charge q is placed inside a conducting spherical shell of inner radius 2R and outer radius 3R at a distance of R from the centre of the shell. The electric potential at the centre of shell will be 14πϵ0 times:

Thalami Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?

A rod of length 2.4 m and mass 6 kg is bent to form a regular hexagon. Find the moment of inertia of the hexagon about the axis perpendicular to the plane of hexagon passing through its centre.

In the previous problem, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury = 13.6)

A charge q is placed in the middle of a line joining the two equal and like point charges Q. This system will remain in equilibrum for which the value of q is-

A body moving along a straight line with uniform acceleration, starts from point O and through points A, B, C and D at distances x1, x2, x3 and x4 from O. It covers distances AB, BC and CD in equal intervals of time. Then (x4 - x1) is equal to

A train is moving towards north. At one place it turns towards north-east, here we observe that

65. An object of specific gravity p is hung from a mass less string. The tension in string is T.The object is immersed in water so that one half of its volume is submerged. The new tension in the string is?

Total energy of a harmonic oscillator of mass 2 kg is 9 J and its potential energy at mean position is5 J. Its amplitude is 0.01 m, its angular frequencywill be(1) 102 rad/s(3) 2 x 102 rad/s(2) V2x10 rad/s(4) 4 x 102 rad/s

Name the type of magnet which is formed when subjected to an electric current.

Monochromatic light of wavelength 3000 ˙A is incident on a surface area 4 cm2. If the intensity of light is 150 mW/m2, then the rate at which photons strike the target is

A is a set containing 10 elements. A subset P1 of A is formed and the set A is reconstructed by replacing all its elements. Again a subset P2 is formed and the set A is reconstructed. Similarly 10 subsets upto P10 are formed. Find the probability that "Pi intersection Pj = φ for all i≠j"

a segment of wirevibrates with fundamental frequency 400hz under a tension of 8kg. the tension at which the fundamental frequency of same wire becomes 800hz

The position of a moving particle is given by equation x=(t^2+3t-5)m, then displacement of particle between t=1 second to t=2 second is 1)+4m 2)-4m 3)-6m 4)6m

what is meant by potential energy of atom?

A heavy particle is projected with a velocity at an angle with the horizontal into a uniform gravitational field. The slope of the trajectory cannot be represented by which of the following curves?

The image formed by the objective of a compound microscope is

Calculate the momentum of a photon of light of wavelength 500 nm.

Why Cathode rays get deflected in presence of magnetic field?

An ideal engine has an efficiency of 112. When the temperature of sink is reduced by 70∘C, its efficiency gets doubled. The temperature of the source is

The kinetic energy required to project a body of mass m from earth's surface (radius R) to just escape from earth's atmosphere

The maximum and minimum distances of a comet from the sun are 1.6×1012 m and 8.0×1010 m respectively. If the speed of the comet at the nearest point is 6×104 ms−1, the speed at the farthest point is:

A solid sphere and solid cylinder of identical radii approach an incline with the same linear velocity (see figure). Both roll without slipping all throughout. The two climb maximum heights hsph and hcyl on the incline. The ratio hsphhcyl is given by

A person of mass 60 kg inside a lift of mass 940 kg presses the button on control panel. The lift starts moving upwards with an acceleration of 1 m/s2. If g=10 m/s2 , the tension in the supporting cable is

A school building is 42 m long and 20 m high. A student throws a cricket ball, from a point x m away from the base of building as shown in the figure. The ball just clears the front and back tops of the building. If the time of flight is 5 s, then the value of x is

A. Would you mind if I sit down. B. On entering the room, Ram was found hanging from the ceiling. C. If he was here now, we would have had no difficulty. D. He had to fight at odds with him.

A roller coaster is travelling on a flat track with a minimum radius of curvature of 15 m and the train car has a maximum velocity of 15 m/s. What should be the friction coefficient between the train car and the track for the ride to be safe? (g=10 m/s2)

A car moving with a velocity of 10 m/s can be stopped by the application of a constant force F in a distance of 20 m. If the velocity of the car is 30 m/s, it can be stopped by this force in

The charge flowing through a resistance R varies with time as Q=2t−8t2. The total heat produced (in joules) in the resistance is(for 0≤t≤18 s)

Which of the following is true for the figure showing electric lines of force? (E is Electrical field and V is potential)

An electron is moving towards x-axis. An electric field is along y-direction then path of electron is

mobile sea of electrons is responsible for malleability,ductility,metallic lustre.explai

38. a bivalent metal has the equivalent weight 12. The molecular weight of its oxide will be

If IA=π/4∫0(√tanx+√cotx)dx and IB=π/4∫0cosx√cos2xdx, then IAIB=

Units of work and energy and their interconversions