50278 + Interview Questions in Physics

1.	Real gases behave much like an ideal gas at
Answer» Real gases behave much like an ideal gas at

Discussion

2.	A battery of emf E0=12 V is connected across a 4 m long uniform wire having resistance 4 Ω/m. The cells of small emfs ε1=2 V and ε2=4 V having internal resistance 2 Ω and 6 Ω respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to (in cm)
Answer» A battery of emf $E_{0} = 12 V$ is connected across a $4 m$ long uniform wire having resistance $4 Ω / m$ . The cells of small emfs $ε_{1} = 2 V$ and $ε_{2} = 4 V$ having internal resistance $2 Ω$ and $6 Ω$ respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point $N$ , the distance of point $N$ from the point $A$ is equal to (in $cm$ )

Discussion

3.	A police car moving at 22 m/s chases a motorcyclist. The police man sounds his horn of frequency 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of motorcyclist if it is given that he does not hear any beat (speed of sound in air is 330 m/s)
Answer» A police car moving at 22 m/s chases a motorcyclist. The police man sounds his horn of frequency 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of motorcyclist if it is given that he does not hear any beat (speed of sound in air is 330 m/s)

Discussion

4.	A block of mass 5 kg which is at rest can slide along the smooth track. A man pulls the block through a rope having tension 10 N which makes an angle of 60∘ with horizontal. If the block moves 5 m along horizontal, the amount of work done by tension is
Answer» A block of mass $5 kg$ which is at rest can slide along the smooth track. A man pulls the block through a rope having tension $10 N$ which makes an angle of $60^{\circ}$ with horizontal. If the block moves $5 m$ along horizontal, the amount of work done by tension is

Discussion

5.	What happens to TPP when the MPP of the variable input is negative? Why?
Answer» What happens to TPP when the MPP of the variable input is negative? Why?

Discussion

6.	A positive ion having just one electron ejects it if a photom of wavelength 228 ∘A or less is absorbed by it. Identify the ion.
Answer» A positive ion having just one electron ejects it if a photom of wavelength 228 $\circ A$ or less is absorbed by it. Identify the ion.

Discussion

7.	Two point charges qA=3μc and qB=−3μc are located 20 cm apart in vaccum. What is the electric field at the midpoint of the line joining the two charges.
Answer» Two point charges $q_{A} = 3 μ c a n d q_{B} = - 3 μ c$ are located 20 cm apart in vaccum. What is the electric field at the midpoint of the line joining the two charges.

Discussion

8.	The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength λ is emitted. The wavelength of photon produced during its transition from 4E3 level to E is
Answer» The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength $λ$ is emitted. The wavelength of photon produced during its transition from $\frac{4 E}{3}$ level to E is

Discussion

9.	Assume that a tunnel is dug across the earth (radius = R) passing through its centre. Find the time a particle takes to cover the length of the tunnel if (a) it is projected into the tunnel with a speed of √gR (b) it is released from a height R above the tunnel (c) it is thrown vertically upward along the length of tunnel with a speed of √gR
Answer» Assume that a tunnel is dug across the earth (radius = R) passing through its centre. Find the time a particle takes to cover the length of the tunnel if (a) it is projected into the tunnel with a speed of $\sqrt{g R}$ (b) it is released from a height R above the tunnel (c) it is thrown vertically upward along the length of tunnel with a speed of $\sqrt{g R}$

Discussion

10.	Three blocks of masses 2 kg, 4 kg and 6 kg are connected by strings and placed on a fricitionless incline of 53∘ as shown. A force of 120 N is applied upward along the incline on the 6 kg block so that system accelerates. If the strings are ideal, the ratio tension in the strings T1T2 will be (g=10 ms−2)
Answer» Three blocks of masses $2 kg$ , $4 kg$ and $6 kg$ are connected by strings and placed on a fricitionless incline of $53^{\circ}$ as shown. A force of $120 N$ is applied upward along the incline on the $6 kg$ block so that system accelerates. If the strings are ideal, the ratio tension in the strings $\frac{T_{1}}{T_{2}}$ will be $(g = 10 {ms}^{- 2})$

Discussion

11.	We have a 12 m×12 m piece of thin material and want to make an open box by cutting small squares at the corners of our material and folding the side up. Find out the side of small squares for which the volume of box becomes maximum.
Answer» We have a $12 m \times 12 m$ piece of thin material and want to make an open box by cutting small squares at the corners of our material and folding the side up. Find out the side of small squares for which the volume of box becomes maximum.

Discussion

12.	If a lift started from floor 1 ascents with uniform acceleration a and retards with uniform retardation 2a to stop at floor 2, in a time interval of t. Then the height between floors will be
Answer» If a lift started from floor 1 ascents with uniform acceleration $a$ and retards with uniform retardation 2 $a$ to stop at floor 2, in a time interval of $t$ . Then the height between floors will be

Discussion

13.	A conducting wire is in the shape of a regular hexagon, which is inscribed inside an imaginary circle of radius R as shown in the figure. A current I flows through the wire. The magnitude of the magnetic field at the centre of the circle is
Answer» A conducting wire is in the shape of a regular hexagon, which is inscribed inside an imaginary circle of radius R as shown in the figure. A current I flows through the wire. The magnitude of the magnetic field at the centre of the circle is

Discussion

14.	The equation of stationary wave is y=4 sin(πx15) cos (96πt). The distance between a node and its next antinode is
Answer» The equation of stationary wave is $y = 4 sin (\frac{π x}{15}) cos (96 π t)$ . The distance between a node and its next antinode is

Discussion

15.	A balloon starts rising from the surface of the earth. The ascension rate is constant and equal to V0. Due to the wind the balloon gathers a horizontal velocity component Vx=Ky where K is a constant and y is the height of ascent. The horizontal drift of the balloon depends on the height of the ascent as
Answer» A balloon starts rising from the surface of the earth. The ascension rate is constant and equal to $V_{0}$ . Due to the wind the balloon gathers a horizontal velocity component $V_{x} = K y$ where K is a constant and y is the height of ascent. The horizontal drift of the balloon depends on the height of the ascent as

Discussion

16.	The bodies situated on the surface of earth at its equator, becomes weightless, when the earth has KE about it axis
Answer» The bodies situated on the surface of earth at its equator, becomes weightless, when the earth has KE about it axis

Discussion

17.	The root mean square value of the voltage in an AC circuit with peak voltage V0 is
Answer» The root mean square value of the voltage in an AC circuit with peak voltage $V_{0}$ is

Discussion

18.	A rocket of mass M is launched vertically from the surface of the earth with an initial speed v. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is
Answer» A rocket of mass M is launched vertically from the surface of the earth with an initial speed v. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

Discussion

19.	The laser beam of wavelength, λ=5×10−7 m strikes normally on a blackened plate and produces a force of 10−5 N. Mass of plate is 10 g and its specific heat capacity is 400 J kg−1K−1 . The temperature rise of plate per second is x K. Then the value of x100 is (Answer upto two digits after decimal point)
Answer» The laser beam of wavelength, $λ = 5 \times 10^{- 7} m$ strikes normally on a blackened plate and produces a force of $10^{- 5} N$ . Mass of plate is $10 g$ and its specific heat capacity is $400 J k g^{- 1} K^{- 1}$ . The temperature rise of plate per second is $x K$ . Then the value of $\frac{x}{100}$ is (Answer upto two digits after decimal point)

Discussion

20.	There are two plane mirrors placed at some angle θ with each other. A ray incident on first mirror (travelling parallel to second mirror) , travels parallel to the first mirror after two successive reflections. Find the angle θ between the mirrors.
Answer» There are two plane mirrors placed at some angle $θ$ with each other. A ray incident on first mirror (travelling parallel to second mirror) , travels parallel to the first mirror after two successive reflections. Find the angle $θ$ between the mirrors.

Discussion

21.	Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum, is located at a distance of
Answer» Two point masses of 0.3 kg and 0.7 kg are fixed at the ends of a rod of length 1.4 m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum, is located at a distance of

Discussion

22.	Two rods of same length, area of cross-section and material transfer a given amount of heat in 12s, when they are joined end to end (i.e. in series).But when they are joined in parallel, they will transfer same heat under same conditions in
Answer» Two rods of same length, area of cross-section and material transfer a given amount of heat in 12s, when they are joined end to end (i.e. in series).But when they are joined in parallel, they will transfer same heat under same conditions in

Discussion

23.	What is the radius of the biggest aluminum coin of thickness, t and density ρ, which will still be able to float on the water surface of surface tension S?
Answer» What is the radius of the biggest aluminum coin of thickness, t and density ρ, which will still be able to float on the water surface of surface tension S?

Discussion

24.	A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be :
Answer» A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be :

Discussion

25.	A block M shown in the figure oscillates in a simple harmonic motion with amplitude A. The amplitude of the point P is
Answer» A block $M$ shown in the figure oscillates in a simple harmonic motion with amplitude $A$ . The amplitude of the point $P$ is

Discussion

26.	Two wires of equal length and cross-section are suspended as shown. Their Young’s modulii are y1 and y2 respectively. The equivalent Young’s modulus will be
Answer» Two wires of equal length and cross-section are suspended as shown. Their Young’s modulii are $y_{1}$ and $y_{2}$ respectively. The equivalent Young’s modulus will be

Discussion

27.	What happens to a light ray that is incident normally on a surface?
Answer» What happens to a light ray that is incident normally on a surface?

Discussion

28.	In a standing wave pattern in a vibrating air column, nodes are formed at a distance of 4.0 cm. If the speed of sound in air is 328 ms−1, what is the frequency of the source?
Answer» In a standing wave pattern in a vibrating air column, nodes are formed at a distance of 4.0 cm. If the speed of sound in air is $328 m s^{- 1}$ , what is the frequency of the source?

Discussion

29.	The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length f. The distance between 1st and 2nd maxima on screen is y and a is slit width. Then the wave length of light used is
Answer» The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length $f$ . The distance between $1^{s t}$ and $2^{n d}$ maxima on screen is $y$ and $a$ is slit width. Then the wave length of light used is

Discussion

30.	In the below figure, a square loop consisting of an inductor of inductance L and resistor of resistance R is placed between two long parallel wires. The two long straight wires have time-varying current of magnitude I=I0 cos ωt A but the directions of current in them are opposite. Total magnetic flux in this loop is
Answer» In the below figure, a square loop consisting of an inductor of inductance L and resistor of resistance R is placed between two long parallel wires. The two long straight wires have time-varying current of magnitude $I = I_{0} c o s ω t$ A but the directions of current in them are opposite. Total magnetic flux in this loop is

Discussion

31.	A particle of mass 0.3 kg is subjected to a force F=−kx with k=15 Nm. What will be the magnitude of its initial acceleration (in ms2), if it is released from a point x=20 cm from its equilibrium position?
Answer» A particle of mass $0.3 k g$ is subjected to a force $F = - k x$ with $k = 15 \frac{N}{m}$ . What will be the magnitude of its initial acceleration (in $\frac{m}{s^{2}}$ ), if it is released from a point $x = 20 c m$ from its equilibrium position?

Discussion

32.	A spherical ball contracts in volume by 0.02% when subjected to a normal uniform pressure of 100 atm. The bulk modulus of its material is
Answer» A spherical ball contracts in volume by $0.02 %$ when subjected to a normal uniform pressure of $100 atm$ . The bulk modulus of its material is

Discussion

33.	A bent wire AB carrying a current I is placed in a region of uniform magnetic field →B. The force on the wire AB is
Answer» A bent wire AB carrying a current I is placed in a region of uniform magnetic field $\to B$ . The force on the wire AB is

33.

A bent wire AB carrying a current I is placed in a region of uniform magnetic field →B. The force on the wire AB is

Answer»

A bent wire AB carrying a current I is placed in a region of uniform magnetic field $\to B$ . The force on the wire AB is

Discussion

34.	A small block of mass 1 kg is placed over a plank of mass 2 kg. The length of the plank is 2 m. Coefficient of friction between the block and the plank is 0.5 and the ground over which plank is placed is smooth. A constant force F=30 N is applied on the plank in horizontal direction. The time after which the block will separate from the plank is (g=10m/s2)
Answer» A small block of mass $1 k g$ is placed over a plank of mass $2 k g$ . The length of the plank is $2 m$ . Coefficient of friction between the block and the plank is $0.5$ and the ground over which plank is placed is smooth. A constant force $F = 30 N$ is applied on the plank in horizontal direction. The time after which the block will separate from the plank is $(g = 10 m / s^{2})$

Discussion

35.	A ball is projected from point O on the ground. It hits a smooth vertical wall AB at a height h and rebounds elastically. The ball finally lands at a point C on the ground. During the course of motion, the maximum height attained by the ball is H. The ratio Hh if OAOC=13 is (Answer upto two digits after the decimal point)
Answer» A ball is projected from point O on the ground. It hits a smooth vertical wall AB at a height h and rebounds elastically. The ball finally lands at a point C on the ground. During the course of motion, the maximum height attained by the ball is H. The ratio $\frac{H}{h}$ if $\frac{O A}{O C} = \frac{1}{3}$ is (Answer upto two digits after the decimal point)

Discussion

36.	What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to a maximum vertical height of 40 cm. (Take g=9.8 m/s2)
Answer» What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to a maximum vertical height of $40 cm$ . (Take $g = 9.8 {m/s}^{2}$ )

Discussion

37.	An object is placed symmetrically between two plane mirrors inclined at an angle of 72∘, then the total number of images observed will be
Answer» An object is placed symmetrically between two plane mirrors inclined at an angle of $72^{\circ}$ , then the total number of images observed will be

Discussion

38.	Consider the situation shown in the figure. The capacitor A has charge q on it, whereas B is uncharged. The charge appearing on the capacitor B a long time after the switch S is closed, is:
Answer» Consider the situation shown in the figure. The capacitor A has charge q on it, whereas B is uncharged. The charge appearing on the capacitor B a long time after the switch S is closed, is:

Discussion

39.	A window surmounted by a semicircle. If the perimeter of the window is 10 cm , find the dimensions so as to allow maximum light to enter from the window.
Answer» A window surmounted by a semicircle. If the perimeter of the window is 10 cm , find the dimensions so as to allow maximum light to enter from the window.

Discussion

40.	Power applied to a particle varies with time as P=(3t2−2t+1) W, where t is in second. Find the change in its kinetic energy as time changes from t=2 s to t=4 s.
Answer» Power applied to a particle varies with time as $P = (3 t^{2} - 2 t + 1) W$ , where $t$ is in second. Find the change in its kinetic energy as time changes from $t = 2 s$ to $t = 4 s$ .

Discussion

41.	Upon increasing the temperature of a black body, it is observed that the wavelength corresponding to maximum energy changes from 0.26 μm to 0.13 μm. The ratio of the emissive powers of the body at the two temperatures is:
Answer» Upon increasing the temperature of a black body, it is observed that the wavelength corresponding to maximum energy changes from $0.26 μ m$ to $0.13 μ m$ . The ratio of the emissive powers of the body at the two temperatures is:

Discussion

42.	In a potentiometer if S is increased keeping all parameters unchanged what is the change in null point?
Answer» In a potentiometer if S is increased keeping all parameters unchanged what is the change in null point?

Discussion

43.	A black body at a temperature of 327∘C radiates 4 cal cm−2s−1 at a temperature of 927∘C, the rate of heat radiated per unit area in cal cm−2s−1 will be
Answer» A black body at a temperature of $327^{\circ} C$ radiates $4 {cal cm}^{- 2} s^{- 1}$ at a temperature of $927^{\circ} C$ , the rate of heat radiated per unit area in ${cal cm}^{- 2} s^{- 1}$ will be

Discussion

44.	Water flows at a speed of 16 cm/s through a tube of radius 10 cm. Co-efficient of viscocity of water at room temperature is 0.01 poise. Then, find the Reynolds number.
Answer» Water flows at a speed of $16 cm/s$ through a tube of radius $10 cm$ . Co-efficient of viscocity of water at room temperature is $0.01$ poise. Then, find the Reynolds number.

Discussion

45.	A wire has a mass (0.3 +/- 0.003) , RADIUS(0.5 +/- 0.005) MM and length (6+/-0.06) cm. the maximum percentage error in measurements of density is?
Answer» A wire has a mass (0.3 +/- 0.003) , RADIUS(0.5 +/- 0.005) MM and length (6+/-0.06) cm. the maximum percentage error in measurements of density is?

Discussion

46.	What are advantages of SI system?
Answer» What are advantages of SI system?

Discussion

47.	The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m, is
Answer» The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature $T$ (Kelvin) and mass $m$ , is

Discussion

48.	Velocity-time graph for a body of mass 10 kg is shown in figure. Work done on the body in the first two seconds of motion is
Answer» Velocity-time graph for a body of mass $10 kg$ is shown in figure. Work done on the body in the first two seconds of motion is

Discussion

49.	Three point masses M1=1.6 kg,M2=2.4 kg and M3=2 kg are placed at the corners of a thin massless rectangular sheet (1.2 m×1.0 m) as shown in the figure below. Centre of mass of the system will be located at a point (assuming M1 to be at the origin)
Answer» Three point masses $M_{1} = 1.6 kg, M_{2} = 2.4 kg$ and $M_{3} = 2 kg$ are placed at the corners of a thin massless rectangular sheet $(1 .2 m \times 1.0 m)$ as shown in the figure below. Centre of mass of the system will be located at a point (assuming $M_{1}$ to be at the origin)

Discussion

50.	The ends of copper rod of length 1 m and area of cross section 1 cm2 are maintained at 0∘C and 100∘C. At the centre of the rod there is a source of heat of power 25 W. Thermal conductivity of copper is 400 W/m-K. In steady state, the temperature at the section of rod at which source is supplying heat, will be
Answer» The ends of copper rod of length $1 m$ and area of cross section $1 {cm}^{2}$ are maintained at $0^{\circ} C$ and $100^{\circ} C$ . At the centre of the rod there is a source of heat of power $25 W$ . Thermal conductivity of copper is $400 W/m-K$ . In steady state, the temperature at the section of rod at which source is supplying heat, will be

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Real gases behave much like an ideal gas at

A police car moving at 22 m/s chases a motorcyclist. The police man sounds his horn of frequency 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of motorcyclist if it is given that he does not hear any beat (speed of sound in air is 330 m/s)

A block of mass 5 kg which is at rest can slide along the smooth track. A man pulls the block through a rope having tension 10 N which makes an angle of 60∘ with horizontal. If the block moves 5 m along horizontal, the amount of work done by tension is

What happens to TPP when the MPP of the variable input is negative? Why?

A positive ion having just one electron ejects it if a photom of wavelength 228 ∘A or less is absorbed by it. Identify the ion.

Two point charges qA=3μc and qB=−3μc are located 20 cm apart in vaccum. What is the electric field at the midpoint of the line joining the two charges.

The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength λ is emitted. The wavelength of photon produced during its transition from 4E3 level to E is

We have a 12 m×12 m piece of thin material and want to make an open box by cutting small squares at the corners of our material and folding the side up. Find out the side of small squares for which the volume of box becomes maximum.

If a lift started from floor 1 ascents with uniform acceleration a and retards with uniform retardation 2a to stop at floor 2, in a time interval of t. Then the height between floors will be

A conducting wire is in the shape of a regular hexagon, which is inscribed inside an imaginary circle of radius R as shown in the figure. A current I flows through the wire. The magnitude of the magnetic field at the centre of the circle is

The equation of stationary wave is y=4 sin(πx15) cos (96πt). The distance between a node and its next antinode is

The bodies situated on the surface of earth at its equator, becomes weightless, when the earth has KE about it axis

The root mean square value of the voltage in an AC circuit with peak voltage V0 is

A rocket of mass M is launched vertically from the surface of the earth with an initial speed v. Assuming the radius of the earth to be R and negligible air resistance, the maximum height attained by the rocket above the surface of the earth is

There are two plane mirrors placed at some angle θ with each other. A ray incident on first mirror (travelling parallel to second mirror) , travels parallel to the first mirror after two successive reflections. Find the angle θ between the mirrors.

Two rods of same length, area of cross-section and material transfer a given amount of heat in 12s, when they are joined end to end (i.e. in series).But when they are joined in parallel, they will transfer same heat under same conditions in

What is the radius of the biggest aluminum coin of thickness, t and density ρ, which will still be able to float on the water surface of surface tension S?

A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be :

A block M shown in the figure oscillates in a simple harmonic motion with amplitude A. The amplitude of the point P is

Two wires of equal length and cross-section are suspended as shown. Their Young’s modulii are y1 and y2 respectively. The equivalent Young’s modulus will be

What happens to a light ray that is incident normally on a surface?

In a standing wave pattern in a vibrating air column, nodes are formed at a distance of 4.0 cm. If the speed of sound in air is 328 ms−1, what is the frequency of the source?

The fraunhofer diffraction pattern of a single slit is formed at the focal plane of a lens of focal length f. The distance between 1st and 2nd maxima on screen is y and a is slit width. Then the wave length of light used is

A particle of mass 0.3 kg is subjected to a force F=−kx with k=15 Nm. What will be the magnitude of its initial acceleration (in ms2), if it is released from a point x=20 cm from its equilibrium position?

A spherical ball contracts in volume by 0.02% when subjected to a normal uniform pressure of 100 atm. The bulk modulus of its material is

A bent wire AB carrying a current I is placed in a region of uniform magnetic field →B. The force on the wire AB is

What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to a maximum vertical height of 40 cm. (Take g=9.8 m/s2)

An object is placed symmetrically between two plane mirrors inclined at an angle of 72∘, then the total number of images observed will be

Consider the situation shown in the figure. The capacitor A has charge q on it, whereas B is uncharged. The charge appearing on the capacitor B a long time after the switch S is closed, is:

A window surmounted by a semicircle. If the perimeter of the window is 10 cm , find the dimensions so as to allow maximum light to enter from the window.

Power applied to a particle varies with time as P=(3t2−2t+1) W, where t is in second. Find the change in its kinetic energy as time changes from t=2 s to t=4 s.

Upon increasing the temperature of a black body, it is observed that the wavelength corresponding to maximum energy changes from 0.26 μm to 0.13 μm. The ratio of the emissive powers of the body at the two temperatures is:

In a potentiometer if S is increased keeping all parameters unchanged what is the change in null point?

A black body at a temperature of 327∘C radiates 4 cal cm−2s−1 at a temperature of 927∘C, the rate of heat radiated per unit area in cal cm−2s−1 will be

Water flows at a speed of 16 cm/s through a tube of radius 10 cm. Co-efficient of viscocity of water at room temperature is 0.01 poise. Then, find the Reynolds number.

A wire has a mass (0.3 +/- 0.003) , RADIUS(0.5 +/- 0.005) MM and length (6+/-0.06) cm. the maximum percentage error in measurements of density is?

What are advantages of SI system?

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m, is

Velocity-time graph for a body of mass 10 kg is shown in figure. Work done on the body in the first two seconds of motion is

Three point masses M1=1.6 kg,M2=2.4 kg and M3=2 kg are placed at the corners of a thin massless rectangular sheet (1.2 m×1.0 m) as shown in the figure below. Centre of mass of the system will be located at a point (assuming M1 to be at the origin)