50278 + Interview Questions in Physics

1.	A hall has the dimensions 10 m×10 m×10 m. A fly starting at one corner ends up at a diagonally opposite corner. The magnitude of its displacement is nearly
Answer» A hall has the dimensions $10 m \times 10 m \times 10 m .$ A fly starting at one corner ends up at a diagonally opposite corner. The magnitude of its displacement is nearly

Discussion

2.	An object of mass 1 kg attached to the string of length 1 m is whirled in a vertical circle at a constant angular speed. If the maximum tension in the string is 60 N, then what is the speed of the object at the lowest point?
Answer» An object of mass $1 kg$ attached to the string of length $1 m$ is whirled in a vertical circle at a constant angular speed. If the maximum tension in the string is $60 N$ , then what is the speed of the object at the lowest point?

Discussion

3.	What should be the maximum speed with which a car can be driven through a curve of radius 18 m without skidding (where, g=10 ms−2, coefficient of static friction between the rubber tyres and the roadway is 0.2)?
Answer» What should be the maximum speed with which a car can be driven through a curve of radius $18 m$ without skidding (where, $g = 10 m s^{- 2}$ , coefficient of static friction between the rubber tyres and the roadway is $0.2$ )?

Discussion

4.	What is matter and antimatter?what is it's annihilation means?
Answer» What is matter and antimatter?what is it's annihilation means?

Discussion

5.	A fly wheel of mass 20kg has a radius of 10 cm and rotates at a frequency of 240 r.p.m. It's rotational kinetic energy is
Answer» A fly wheel of mass 20kg has a radius of 10 cm and rotates at a frequency of 240 r.p.m. It's rotational kinetic energy is

Discussion

6.	In a 12 storied building , 3 person enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?
Answer» In a $12$ storied building , $3$ person enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

Discussion

7.	A boat moves with a speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The time taken in a round trip, when boat travel shortest distance is
Answer» A boat moves with a speed of $5 k m / h$ relative to water in a river flowing with a speed of $3 k m / h$ and having a width of $1 k m$ . The time taken in a round trip, when boat travel shortest distance is

Discussion

8.	At what temperature is the kinetic energy of a gas molecule half its value at 327∘C?
Answer» At what temperature is the kinetic energy of a gas molecule half its value at $327^{\circ} C$ ?

Discussion

9.	The equation of motion of a particle executing simple harmonic motion is a+16π2x=0. In this equation, a is linear acceleration in m/s2 of the particle at displacement x in m. The time period of this simple harmonic motion is
Answer» The equation of motion of a particle executing simple harmonic motion is $a + 16 π^{2} x = 0$ . In this equation, $a$ is linear acceleration in ${m/s}^{2}$ of the particle at displacement $x$ in $m$ . The time period of this simple harmonic motion is

Discussion

10.	A block of mass 1kg is placed on the floor. The coefficient of static friction is 0.2. If a force of 1N is applied to the block, the force of friction is
Answer» A block of mass 1kg is placed on the floor. The coefficient of static friction is 0.2. If a force of 1N is applied to the block, the force of friction is

10.

A block of mass 1kg is placed on the floor. The coefficient of static friction is 0.2. If a force of 1N is applied to the block, the force of friction is

Answer»

A block of mass 1kg is placed on the floor. The coefficient of static friction is 0.2. If a force of 1N is applied to the block, the force of friction is

Discussion

11.	Two wooden blocks are moving on a smooth horizontal surface such that the mass m remains stationary with respect to the block of mass M as shown. Find the magnitude of P.
Answer» Two wooden blocks are moving on a smooth horizontal surface such that the mass $m$ remains stationary with respect to the block of mass $M$ as shown. Find the magnitude of $P$ .

Discussion

12.	The dependence of electric potential V on the distance ′r′ from the centre of a charged spherical shell is shown by
Answer» The dependence of electric potential $V$ on the distance $^{'} r^{'}$ from the centre of a charged spherical shell is shown by

Discussion

13.	Bucket to a bucket of water is suspended from a spring balance. what happens to reading of balance a)when piece of stone is suspended from string is immersed in water without touching bucket.b)when piece of lead or cork is put in water in the bucket
Answer» Bucket to a bucket of water is suspended from a spring balance. what happens to reading of balance a)when piece of stone is suspended from string is immersed in water without touching bucket.b)when piece of lead or cork is put in water in the bucket

Discussion

14.	An infinite vertical plane of positive charge has a surface charge density µ . A metal balls of mass m and charge q is attached to a thread and tied to a point A on sheet PQ. Find the angle which AB makes with plane PQ
Answer» An infinite vertical plane of positive charge has a surface charge density µ . A metal balls of mass m and charge q is attached to a thread and tied to a point A on sheet PQ. Find the angle which AB makes with plane PQ

Discussion

15.	Rain is falling vertically with the speed of 60 m/s. A man rides a bicycle with the speed of 20 m/s in east to west direction. What is the direction in which he should hold the umbrella?
Answer» Rain is falling vertically with the speed of 60 m/s. A man rides a bicycle with the speed of 20 m/s in east to west direction. What is the direction in which he should hold the umbrella?

Discussion

16.	A pulley which is fixed to the ceiling of an elevator car carries a thread whose ends are attached to the masses m1 and m2. The car starts going up with an acceleration a0. Assuming the masses of the pulley and the thread as well as the friction to be negligible, find: Match the given columns according to the options where, is the acceleration of the load m1 relative to the ground. Is the acceleration of the load m1 relative to the elevator car. is the force exerted by the pulley on the ceiling of the car. Given, m1>m2 (i) am1g (u) 4m1m2(a0+g)(m1+m2) (ii)am1elevator (v) 2a1m1−gm2(m1+m2) (iii)Fpulley on cieling (w) 2a0m2−g(m1−m2)(m1+m2)
Answer» A pulley which is fixed to the ceiling of an elevator car carries a thread whose ends are attached to the masses $m_{1}$ and $m_{2}$ . The car starts going up with an acceleration $a_{0}$ . Assuming the masses of the pulley and the thread as well as the friction to be negligible, find: Match the given columns according to the options where, is the acceleration of the load $m_{1}$ relative to the ground. Is the acceleration of the load $m_{1}$ relative to the elevator car. is the force exerted by the pulley on the ceiling of the car. Given, $m_{1} > m_{2}$ (i) $a_{\frac{m_{1}}{g}}$ (u) $\frac{4 m_{1} m_{2} (a_{0} + g)}{(m_{1} + m_{2})}$ (ii) $a_{\frac{m_{1}}{e l e v a t o r}}$ (v) $\frac{2 a_{1} m_{1} - g m_{2}}{(m_{1} + m_{2})}$ (iii) $F_{p u l l e y o n c i e l i n g}$ (w) $\frac{2 a_{0} m_{2} - g (m_{1} - m_{2})}{(m_{1} + m_{2})}$

16.

A pulley which is fixed to the ceiling of an elevator car carries a thread whose ends are attached to the masses m1 and m2. The car starts going up with an acceleration a0. Assuming the masses of the pulley and the thread as well as the friction to be negligible, find: Match the given columns according to the options where, is the acceleration of the load m1 relative to the ground. Is the acceleration of the load m1 relative to the elevator car. is the force exerted by the pulley on the ceiling of the car. Given, m1>m2 (i) am1g (u) 4m1m2(a0+g)(m1+m2) (ii)am1elevator (v) 2a1m1−gm2(m1+m2) (iii)Fpulley on cieling (w) 2a0m2−g(m1−m2)(m1+m2)

Answer»

A pulley which is fixed to the ceiling of an elevator car carries a thread whose ends are attached to the masses $m_{1}$ and $m_{2}$ . The car starts going up with an acceleration $a_{0}$ . Assuming the masses of the pulley and the thread as well as the friction to be negligible, find:

Match the given columns according to the options where,

is the acceleration of the load $m_{1}$ relative to the ground.

Is the acceleration of the load $m_{1}$ relative to the elevator car.

is the force exerted by the pulley on the ceiling of the car. Given, $m_{1} > m_{2}$

(i) $a_{\frac{m_{1}}{g}}$ (u) $\frac{4 m_{1} m_{2} (a_{0} + g)}{(m_{1} + m_{2})}$

(ii) $a_{\frac{m_{1}}{e l e v a t o r}}$ (v) $\frac{2 a_{1} m_{1} - g m_{2}}{(m_{1} + m_{2})}$

(iii) $F_{p u l l e y o n c i e l i n g}$ (w) $\frac{2 a_{0} m_{2} - g (m_{1} - m_{2})}{(m_{1} + m_{2})}$

Discussion

17.	The area of the region bounded by the x-axis and the curves defined by y=tax x,(−π3≤x≤π3) is
Answer» The area of the region bounded by the x-axis and the curves defined by $y = t a x x, (\frac{- π}{3} \leq x \leq \frac{π}{3})$ is

Discussion

18.	A cricket ball is hit at an angle 45° to the horizontal with kinetic energy K the kinetic energy at the highest point is what? a)k b)k/2 c)ksin 45° d)zero
Answer» A cricket ball is hit at an angle 45° to the horizontal with kinetic energy K the kinetic energy at the highest point is what? a)k b)k/2 c)ksin 45° d)zero

18.

A cricket ball is hit at an angle 45° to the horizontal with kinetic energy K the kinetic energy at the highest point is what? a)k b)k/2 c)ksin 45° d)zero

Answer»

A cricket ball is hit at an angle 45° to the horizontal with kinetic energy K the kinetic energy at the highest point is what?

a)k

b)k/2

c)ksin 45°

d)zero

Discussion

19.	In the arrangement shown in the figure, there is two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then
Answer» In the arrangement shown in the figure, there is two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

19.

In the arrangement shown in the figure, there is two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Answer»

In the arrangement shown in the figure, there is two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Discussion

20.	Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10 cm containing the total charge is 25 V-m. The flux through a concentric sphere of radius 20 cm will be?
Answer» Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10 cm containing the total charge is 25 V-m. The flux through a concentric sphere of radius 20 cm will be?

Discussion

21.	The speed of light c, gravitational constant G and planck’s constant h are taken as fundamental units in a system. The dimensions of time in this new system should be
Answer» The speed of light $c$ , gravitational constant $G$ and planck’s constant $h$ are taken as fundamental units in a system. The dimensions of time in this new system should be

Discussion

22.	Find the reading of the spring balance if it is assumed to be of negligible mass. (Take g=10 m/s2)
Answer» Find the reading of the spring balance if it is assumed to be of negligible mass. (Take $g = 10 m / s^{2}$ )

Discussion

23.	A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newton. What is the reading of the machine when the lift is stationary? Take g=9.8 ms−2
Answer» A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newton. What is the reading of the machine when the lift is stationary? Take $g = 9.8 m s^{- 2}$

Discussion

24.	We know that when see something of some specific colour , it is the the colour of light that is being reflected by it .Let say a rose . Rose will reflect only red light and will absorbed all other light. So on this basis , can we say that the energy of rose is increasing since it is absorbing some amount of light(light is also a form of energy)?
Answer» We know that when see something of some specific colour , it is the the colour of light that is being reflected by it .Let say a rose . Rose will reflect only red light and will absorbed all other light. So on this basis , can we say that the energy of rose is increasing since it is absorbing some amount of light(light is also a form of energy)?

Discussion

25.	A uniform sphere is placed on a smooth horizontal surface and a horizontal force F is applied on it at a distance h above the surface.The accerlation of the centre
Answer» A uniform sphere is placed on a smooth horizontal surface and a horizontal force F is applied on it at a distance h above the surface.The accerlation of the centre

Discussion

26.	Find the minimum colatitude which can directl receive a signal from a goestationary satellite.
Answer» Find the minimum colatitude which can directl receive a signal from a goestationary satellite.

Discussion

27.	For a given expression 2x2+5x−9=0. Then the product of the roots will be
Answer» For a given expression $2 x^{2} + 5 x - 9 = 0$ . Then the product of the roots will be

Discussion

28.	Rain is falling vertically with a velocity of 15 ms−1. A person rides a bicycle with a speed of 15 ms−1 in the west to east direction. What is the direction (angle with vertical) in which he should hold his umbrella to save himself from the rain?
Answer» Rain is falling vertically with a velocity of $15 m s^{- 1}$ . A person rides a bicycle with a speed of $15 m s^{- 1}$ in the west to east direction. What is the direction (angle with vertical) in which he should hold his umbrella to save himself from the rain?

Discussion

29.	Match the Van der Waal's for one mole of gas given in column B to the conditions in column A. Column 1Column 2AAt low pressureiP(V−b)=RTBAt high pressureii(P+aV2)V=RTCAt low pressure and high temperatureiiiPV=RTDAt room temperature and pressureiv(P+aV2)(V−b)=RT
Answer» Match the Van der Waal's for one $mole$ of gas given in column $B$ to the conditions in column $A$ . $\begin{matrix} Column 1 & Column 2 A & At low pressure & i & P (V - b) = R T B & At high pressure & i i & (P + \frac{a}{V^{2}}) V = R T C & At low pressure and high temperature & i i i & P V = R T D & At room temperature and pressure & i v & (P + \frac{a}{V^{2}}) (V - b) = R T \end{matrix}$

Discussion

30.	Two coherent point sources S1 and S2 vibrating in phase emit light of wavelength λ0 the separation between the sources is 2λ. consider a line passing thrrough S2 and perpendicular to the lineS1S2 What is the smallest distance from S2 where is the smallest distance from S2 where a minimum of intensity occurs?
Answer» Two coherent point sources $S_{1}$ and $S_{2}$ vibrating in phase emit light of wavelength $λ$ 0 the separation between the sources is $2 λ .$ consider a line passing thrrough $S_{2}$ and perpendicular to the line $S_{1} S_{2}$ What is the smallest distance from $S_{2}$ where is the smallest distance from $S_{2}$ where a minimum of intensity occurs?

Discussion

31.	Give the formulae for the time period, maximum height reached and range of a projectile motion.
Answer» Give the formulae for the time period, maximum height reached and range of a projectile motion.

Discussion

32.	A disc rotates about its axis with a constant angular acceleration of 4 rads2. Find the radial and tangential accelerations of a particle at a distance of 1 cm from the axis at the end of the first second after the disc starts rotating.
Answer» A disc rotates about its axis with a constant angular acceleration of 4 $\frac{r a d}{s^{2}}$ . Find the radial and tangential accelerations of a particle at a distance of 1 cm from the axis at the end of the first second after the disc starts rotating.

Discussion

33.	Two blocks are connected with a string and the system is connected to another string which is fixed at the centre of a circular table as shown in the figure. Find the tension in the string which is fixed at the centre.
Answer» Two blocks are connected with a string and the system is connected to another string which is fixed at the centre of a circular table as shown in the figure. Find the tension in the string which is fixed at the centre.

Discussion

34.	A gun fires a shell and recoils horizontally. if the shell travels along the barrel with speed v, the ratio of speeds with which the gun recoils, if the barrel is (i) horizontal (ii) inclined at an angle of 30∘ with horizontal, is
Answer» A gun fires a shell and recoils horizontally. if the shell travels along the barrel with speed $v$ , the ratio of speeds with which the gun recoils, if the barrel is (i) horizontal (ii) inclined at an angle of $30^{\circ}$ with horizontal, is

Discussion

35.	A certain quantity of a gas occupies 100ml when collected over water at 15∘C and 750mm pressure. If it occupies 91.9ml in dry state at STP. Find the vapour pressure of water at 15∘C.
Answer» A certain quantity of a gas occupies 100ml when collected over water at 15 $^{\circ}$ C and 750mm pressure. If it occupies 91.9ml in dry state at STP. Find the vapour pressure of water at 15 $^{\circ}$ C.

Discussion

36.	I believe that sound is a physical quantity and independent of any other quantity. I want to know why is it not placed in any of the systems (like SI, MKS, FPS, CGS).
Answer» I believe that sound is a physical quantity and independent of any other quantity. I want to know why is it not placed in any of the systems (like SI, MKS, FPS, CGS).

Discussion

37.	Derive an expression for Biot-Savart law along with the diagram. (5 marks)
Answer» Derive an expression for Biot-Savart law along with the diagram. (5 marks)

Discussion

38.	Does all the photoelectron emitted from a surface by given frequency photons should have the same kinetic energy
Answer» Does all the photoelectron emitted from a surface by given frequency photons should have the same kinetic energy

Discussion

39.	A string of length 0.4 m and mass 10−2 kg is tightly clampled at its ends. The tension in the string is 1.6 N. identical wave pulses are produced at one end at equal intervals of time ∆t. The minimum value of ∆t, which allows constructive interference between succesive pulses, is :
Answer» A string of length 0.4 m and mass $10^{- 2}$ kg is tightly clampled at its ends. The tension in the string is 1.6 N. identical wave pulses are produced at one end at equal intervals of time ∆t. The minimum value of ∆t, which allows constructive interference between succesive pulses, is :

Discussion

40.	The dimension formula of resultant when two quantities of dimensions [MLT−1] are added together, is
Answer» The dimension formula of resultant when two quantities of dimensions $[M L T^{- 1}]$ are added together, is

Discussion

41.	If v = (5 - t) m/s and particle starts from origin then its position time graph is
Answer» If v = (5 - t) m/s and particle starts from origin then its position time graph is

Discussion

42.	In the above question, if both are in opposite direction, then the velocity of the pulse with respect to ground will be:
Answer» In the above question, if both are in opposite direction, then the velocity of the pulse with respect to ground will be:

Discussion

43.	A copper rod AB of length L is pivoted at end A and rotates at constant angular velocity ω at right angles to a uniform magnetic field of induction B. The e.m.f developed between the mid point of C of the rod and nd B is
Answer» A copper rod AB of length L is pivoted at end A and rotates at constant angular velocity $ω$ at right angles to a uniform magnetic field of induction B. The e.m.f developed between the mid point of C of the rod and nd B is

Discussion

44.	The velocity – time graph for two bodies A and B are shown. Then the acceleration of A and B are in the ratio
Answer» The velocity – time graph for two bodies A and B are shown. Then the acceleration of A and B are in the ratio

44.

The velocity – time graph for two bodies A and B are shown. Then the acceleration of A and B are in the ratio

Answer»

The velocity – time graph for two bodies A and B are shown. Then the acceleration of A and B are in the ratio

Discussion

45.	Given that →A+→B=→C. If \|→A\|=4,\|→B\|=5 and \|→C\|=√61, then angle between →A and →B is:
Answer» Given that $\to A + \to B = \to C$ . If $\| \to A \| = 4, \| \to B \| = 5$ and $\| \to C \| = \sqrt{61}$ , then angle between $\to A$ and $\to B$ is:

Discussion

46.	The equivalent resistance between A and B is :
Answer» The equivalent resistance between A and B is :

46.

The equivalent resistance between A and B is :

Answer»

The equivalent resistance between A and B is :

Discussion

47.	Figure shows solenoid with 'n' turns per unit length and current 'i'. Magnetic field at P can be given as
Answer» Figure shows solenoid with 'n' turns per unit length and current 'i'. Magnetic field at P can be given as

Discussion

48.	Work done by 1 V battery when switch S is closed in μJis .
Answer» Work done by 1 V battery when switch S is closed in $μ J$ is .

Discussion

49.	The value of ‘g’ decreases with increase in the:
Answer» The value of ‘g’ decreases with increase in the:

Discussion

50.	If a body travels a distance of 97.52 m along a straight line in 2.54 s, then its speed in appropriate significant figures is
Answer» If a body travels a distance of $97.52 m$ along a straight line in $2.54 s$ , then its speed in appropriate significant figures is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A hall has the dimensions 10 m×10 m×10 m. A fly starting at one corner ends up at a diagonally opposite corner. The magnitude of its displacement is nearly

An object of mass 1 kg attached to the string of length 1 m is whirled in a vertical circle at a constant angular speed. If the maximum tension in the string is 60 N, then what is the speed of the object at the lowest point?

What should be the maximum speed with which a car can be driven through a curve of radius 18 m without skidding (where, g=10 ms−2, coefficient of static friction between the rubber tyres and the roadway is 0.2)?

What is matter and antimatter?what is it's annihilation means?

A fly wheel of mass 20kg has a radius of 10 cm and rotates at a frequency of 240 r.p.m. It's rotational kinetic energy is

In a 12 storied building , 3 person enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

A boat moves with a speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The time taken in a round trip, when boat travel shortest distance is

At what temperature is the kinetic energy of a gas molecule half its value at 327∘C?

The equation of motion of a particle executing simple harmonic motion is a+16π2x=0. In this equation, a is linear acceleration in m/s2 of the particle at displacement x in m. The time period of this simple harmonic motion is

A block of mass 1kg is placed on the floor. The coefficient of static friction is 0.2. If a force of 1N is applied to the block, the force of friction is

Two wooden blocks are moving on a smooth horizontal surface such that the mass m remains stationary with respect to the block of mass M as shown. Find the magnitude of P.

The dependence of electric potential V on the distance ′r′ from the centre of a charged spherical shell is shown by

Bucket to a bucket of water is suspended from a spring balance. what happens to reading of balance a)when piece of stone is suspended from string is immersed in water without touching bucket.b)when piece of lead or cork is put in water in the bucket

An infinite vertical plane of positive charge has a surface charge density µ . A metal balls of mass m and charge q is attached to a thread and tied to a point A on sheet PQ. Find the angle which AB makes with plane PQ

Rain is falling vertically with the speed of 60 m/s. A man rides a bicycle with the speed of 20 m/s in east to west direction. What is the direction in which he should hold the umbrella?

The area of the region bounded by the x-axis and the curves defined by y=tax x,(−π3≤x≤π3) is

A cricket ball is hit at an angle 45° to the horizontal with kinetic energy K the kinetic energy at the highest point is what? a)k b)k/2 c)ksin 45° d)zero

In the arrangement shown in the figure, there is two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10 cm containing the total charge is 25 V-m. The flux through a concentric sphere of radius 20 cm will be?

The speed of light c, gravitational constant G and planck’s constant h are taken as fundamental units in a system. The dimensions of time in this new system should be

Find the reading of the spring balance if it is assumed to be of negligible mass. (Take g=10 m/s2)

A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift. The machine reads his weight in newton. What is the reading of the machine when the lift is stationary? Take g=9.8 ms−2

A uniform sphere is placed on a smooth horizontal surface and a horizontal force F is applied on it at a distance h above the surface.The accerlation of the centre

Find the minimum colatitude which can directl receive a signal from a goestationary satellite.

For a given expression 2x2+5x−9=0. Then the product of the roots will be

Rain is falling vertically with a velocity of 15 ms−1. A person rides a bicycle with a speed of 15 ms−1 in the west to east direction. What is the direction (angle with vertical) in which he should hold his umbrella to save himself from the rain?

Match the Van der Waal's for one mole of gas given in column B to the conditions in column A. Column 1Column 2AAt low pressureiP(V−b)=RTBAt high pressureii(P+aV2)V=RTCAt low pressure and high temperatureiiiPV=RTDAt room temperature and pressureiv(P+aV2)(V−b)=RT

Give the formulae for the time period, maximum height reached and range of a projectile motion.

A disc rotates about its axis with a constant angular acceleration of 4 rads2. Find the radial and tangential accelerations of a particle at a distance of 1 cm from the axis at the end of the first second after the disc starts rotating.

Two blocks are connected with a string and the system is connected to another string which is fixed at the centre of a circular table as shown in the figure. Find the tension in the string which is fixed at the centre.

A gun fires a shell and recoils horizontally. if the shell travels along the barrel with speed v, the ratio of speeds with which the gun recoils, if the barrel is (i) horizontal (ii) inclined at an angle of 30∘ with horizontal, is

A certain quantity of a gas occupies 100ml when collected over water at 15∘C and 750mm pressure. If it occupies 91.9ml in dry state at STP. Find the vapour pressure of water at 15∘C.

I believe that sound is a physical quantity and independent of any other quantity. I want to know why is it not placed in any of the systems (like SI, MKS, FPS, CGS).

Derive an expression for Biot-Savart law along with the diagram. (5 marks)

Does all the photoelectron emitted from a surface by given frequency photons should have the same kinetic energy

A string of length 0.4 m and mass 10−2 kg is tightly clampled at its ends. The tension in the string is 1.6 N. identical wave pulses are produced at one end at equal intervals of time ∆t. The minimum value of ∆t, which allows constructive interference between succesive pulses, is :

The dimension formula of resultant when two quantities of dimensions [MLT−1] are added together, is

If v = (5 - t) m/s and particle starts from origin then its position time graph is

In the above question, if both are in opposite direction, then the velocity of the pulse with respect to ground will be:

A copper rod AB of length L is pivoted at end A and rotates at constant angular velocity ω at right angles to a uniform magnetic field of induction B. The e.m.f developed between the mid point of C of the rod and nd B is

The velocity – time graph for two bodies A and B are shown. Then the acceleration of A and B are in the ratio

Given that →A+→B=→C. If |→A|=4,|→B|=5 and |→C|=√61, then angle between →A and →B is:

The equivalent resistance between A and B is :

Figure shows solenoid with 'n' turns per unit length and current 'i'. Magnetic field at P can be given as

Work done by 1 V battery when switch S is closed in μJis .

The value of ‘g’ decreases with increase in the:

If a body travels a distance of 97.52 m along a straight line in 2.54 s, then its speed in appropriate significant figures is