50278 + Interview Questions in Physics Page 265 InterviewSolution

13201.	two forces eah numerically equal to 10 dynes are acting. then find the resul†an t of these vectors.
Answer» two forces eah numerically equal to 10 dynes are acting. then find the resul†an t of these vectors.

Discussion

13202.	If a particle has velocity v(t)=t2−5t+6, the average velocity in 5 sec is
Answer» If a particle has velocity $v (t) = t^{2} - 5 t + 6$ , the average velocity in $5 sec$ is

Discussion

13203.	Find →A.→B
Answer» Find $\to A . \to B$

13203.

Find →A.→B

Answer»

Find $\to A . \to B$

Discussion

13204.	A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used: λ1 = 3650 Å, λ2 = 4047 Å, λ3 = 4358 Å, λ4 = 5461 Å, λ5 = 6907 Å, The stopping voltages, respectively, were measured to be: V01 = 1.28 V, V02 = 0.95 V, V03 = 0.74 V, V04 = 0.16 V, V05 = 0 V Determine the value of Planck’s constant h, the threshold frequency and work function for the material. [Note: You will notice that to get h from the data, you will need to know e (which you can take to be 1.6 × 10–19 C). Experiments of this kind on Na, Li, K, etc. were performed by Millikan, who, using his own value of e (from the oil-drop experiment) confirmed Einstein’s photoelectric equation and at the same time gave an independent estimate of the value of h.]
Answer» A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used: λ1 = 3650 Å, λ2 = 4047 Å, λ3 = 4358 Å, λ4 = 5461 Å, λ5 = 6907 Å, The stopping voltages, respectively, were measured to be: V01 = 1.28 V, V02 = 0.95 V, V03 = 0.74 V, V04 = 0.16 V, V05 = 0 V Determine the value of Planck’s constant h, the threshold frequency and work function for the material. [Note: You will notice that to get h from the data, you will need to know e (which you can take to be 1.6 × 10–19 C). Experiments of this kind on Na, Li, K, etc. were performed by Millikan, who, using his own value of e (from the oil-drop experiment) confirmed Einstein’s photoelectric equation and at the same time gave an independent estimate of the value of h.]

Discussion

13205.	77. The magnification produced by a convex lens for two different positions of an object are m1 and m2 respectively (m1 > m2). If 'd' is the distance of separation between the two of positions of the object then the focal length of the lens is (1) ?m1 x ?m2 (2) d/?(m1 - m2) (3) dm1m2/m1 - m2 (4) d/m1 - m2
Answer» 77. The magnification produced by a convex lens for two different positions of an object are m1 and m2 respectively (m1 > m2). If 'd' is the distance of separation between the two of positions of the object then the focal length of the lens is (1) ?m1 x ?m2 (2) d/?(m1 - m2) (3) dm1m2/m1 - m2 (4) d/m1 - m2

Discussion

13206.	What is the constant that relates the strain in a body along perpendicular directions?
Answer» What is the constant that relates the strain in a body along perpendicular directions?

Discussion

13207.	Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 km h¯¹ in the same direction, with A ahead of B. The driver of B decides to overtake A and accelerates by 1 m s¯². If after 50 s, the guard of B just brushes past the driver of A, what was the original distance between them ?
Answer» Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 km h¯¹ in the same direction, with A ahead of B. The driver of B decides to overtake A and accelerates by 1 m s¯². If after 50 s, the guard of B just brushes past the driver of A, what was the original distance between them ?

Discussion

13208.	A body is displaced from −→rA=(2^i+4^j−2^k) m to −→rB=(8^i+14^j+6^k) m under the action of a constant force →F=(2^i+3^j+6^k) N.If the initial kinetic energy of the body is 15 J, Find the kinetic energy of the body at the end of displacement.
Answer» A body is displaced from $_{A} = (2^i + 4^j - 2^k) m to_{B} = (8^i + 14^j + 6^k) m$ under the action of a constant force $\to F = (2^i + 3^j + 6^k) N$ . If the initial kinetic energy of the body is $15 J$ , Find the kinetic energy of the body at the end of displacement.

Discussion

13209.	A pure inductor of 26 mH is connected to an ac source of 220 V. Given frequency of the source as 50 Hz, the rms current in the circuit is[1 Mark]
Answer» A pure inductor of $26 mH$ is connected to an ac source of $220 V$ . Given frequency of the source as $50 Hz$ , the rms current in the circuit is $[$ 1 Mark $]$

Discussion

13210.	In the Young's double slit experiment, the distance between the slits varies in time as d(t)=d0+a0 sinωt; where d0,ω and a0 are constants. The difference between the largest fringe width and the smallest fringe width, obtained over time, is given as :
Answer» In the Young's double slit experiment, the distance between the slits varies in time as $d (t) = d_{0} + a_{0} sin ω t$ ; where $d_{0}, ω$ and $a_{0}$ are constants. The difference between the largest fringe width and the smallest fringe width, obtained over time, is given as :

Discussion

13211.	64 Why Delta G naught is not zero
Answer» 64 Why Delta G naught is not zero

Discussion

13212.	A 100 kg car is moving with a maximum velocity of 9 m/s across a circular track of radius 30 m. The maximum force of friction between the road and the car is
Answer» A 100 kg car is moving with a maximum velocity of 9 m/s across a circular track of radius 30 m. The maximum force of friction between the road and the car is

Discussion

13213.	A block of mass 5 kg is released from rest when compression in spring is 2 m. Block is not attached with the spring and natural length of the spring is 4 m. Maximum height of block from ground is (g=10 m/s2)
Answer» A block of mass $5 k g$ is released from rest when compression in spring is $2 m$ . Block is not attached with the spring and natural length of the spring is $4 m$ . Maximum height of block from ground is $(g = 10 m / s^{2})$

Discussion

13214.	A uniform thin cylindrical disk of mass M and radius Ris attached to two identical massless springs of springconstant k which are fixed to the wall as shown in thefigure. The springs are attached to the axle of the disksymmetrically on either side at a distance d from itscentre. The axle is massless and both the springs andthe axle are in a horizontal plane. The unstretched lengthof each spring is L. The disk is initially at its equilibriunmposition with its centre of mass (CM) at a distancefrom the wall. The disk rolls without slipping with velocityVo Voi . The coefficient of friction is u. \lbrack IT-JEE 2008\rbrack
Answer» A uniform thin cylindrical disk of mass M and radius Ris attached to two identical massless springs of springconstant k which are fixed to the wall as shown in thefigure. The springs are attached to the axle of the disksymmetrically on either side at a distance d from itscentre. The axle is massless and both the springs andthe axle are in a horizontal plane. The unstretched lengthof each spring is L. The disk is initially at its equilibriunmposition with its centre of mass (CM) at a distancefrom the wall. The disk rolls without slipping with velocityVo Voi . The coefficient of friction is u. \lbrack IT-JEE 2008\rbrack

Discussion

13215.	between two points (0,a) and (a,0) in volt will be
Answer» between two points (0,a) and (a,0) in volt will be

Discussion

13216.	In a hypothetical system of particles a mass m with charge −3q is moving around a very heavy particle having charge q. Assuming Bohr’s model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is
Answer» In a hypothetical system of particles a mass $m$ with charge $- 3 q$ is moving around a very heavy particle having charge q. Assuming Bohr’s model to be true to this system, the orbital velocity of mass $m$ when it is nearest to heavy particle is

Discussion

13217.	A bullet is fired from a cannon with velocity 500 m/s. If the angle of projection is 15∘ and g=10m/s2. Then the range is
Answer» A bullet is fired from a cannon with velocity 500 m/s. If the angle of projection is $15^{\circ}$ and $g = 10 m / s^{2}$ . Then the range is

Discussion

13218.	An electron initially at rest is accelerated through a potential difference of 1 V. The energy gained by the electron is:
Answer» An electron initially at rest is accelerated through a potential difference of 1 V. The energy gained by the electron is:

Discussion

13219.	A block A of mass m1 and block B of mass m2 are connected together by a spring and placed on a bearing surface as shown. The block A performs free vertical harmonic oscillations with amplitude Amax and frequency ω. Assuming that block B doesn't leave the surface and neglecting the mass of the spring, find the maximum and minimum value of force (Rmax & Rmin) that the system exerts on the bearing surface.
Answer» A block $A$ of mass $m_{1}$ and block $B$ of mass $m_{2}$ are connected together by a spring and placed on a bearing surface as shown. The block $A$ performs free vertical harmonic oscillations with amplitude $A_{m a x}$ and frequency $ω$ . Assuming that block $B$ doesn't leave the surface and neglecting the mass of the spring, find the maximum and minimum value of force ( $R_{m a x} & R_{m i n}$ ) that the system exerts on the bearing surface.

Discussion

13220.	Two springs A and B having spring constants kA and kB (kA=4kB) are stretched by applying force of equal magnitude. If energy stored in spring A is EA, then energy stored in B will be:
Answer» Two springs A and B having spring constants $k_{A}$ and $k_{B} (k_{A} = 4 k_{B})$ are stretched by applying force of equal magnitude. If energy stored in spring A is $E_{A}$ , then energy stored in B will be:

Discussion

13221.	If deutron is accelerated from rest through a potential difference of 10 kilovolt (kv). Find its final speed?
Answer» If deutron is accelerated from rest through a potential difference of 10 kilovolt (kv). Find its final speed?

Discussion

13222.	The equivalent resistance between point A and B is-
Answer» The equivalent resistance between point $A$ and $B$ is-

Discussion

13223.	Question 2Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
Answer» Question 2 Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

Discussion

13224.	The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to
Answer» The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

13224.

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

Answer»

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

Discussion

13225.	If a company pays 12,000$ every day to its all employees, then how much money will the company pay to its all employees in the month of January ?
Answer» If a company pays $12, 000 $$ every day to its all employees, then how much money will the company pay to its all employees in the month of January ?

Discussion

13226.	The temperature at which the speed of sound in air becomes double of its value at 27 degee celsius?
Answer» The temperature at which the speed of sound in air becomes double of its value at 27 degee celsius?

Discussion

13227.	Read the following two statements below carefully and state, with reasons, if it is true or false. (a) The Young’s modulus of rubber is greater than that of steel; (b) The stretching of a coil is determined by its shear modulus.
Answer» Read the following two statements below carefully and state, with reasons, if it is true or false. (a) The Young’s modulus of rubber is greater than that of steel; (b) The stretching of a coil is determined by its shear modulus.

Discussion

13228.	A pendulum bob of mass 80 mg ,carrying a charge of 2\ast10^{-8} C is at rest in a uniform ,horizontal electric field of 20kV/m.Find tension in the thread?
Answer» A pendulum bob of mass 80 mg ,carrying a charge of 2\ast10^{-8} C is at rest in a uniform ,horizontal electric field of 20kV/m.Find tension in the thread?

Discussion

13229.	The current generator, Ig, sends a constant current 1 A through the circuit. The wire cd is fixed and ab is made to slide on the smooth thick rails with a constant velocity 20 m/s towards right in a magnetic field of magnitude 1.5 T. Each of these wires has resistance 5 Ω and length of each wire is 0.5 m. Find the current through the wire cd.
Answer» The current generator, $I_{g}$ , sends a constant current $1 A$ through the circuit. The wire $cd$ is fixed and $ab$ is made to slide on the smooth thick rails with a constant velocity $20 m/s$ towards right in a magnetic field of magnitude $1.5 T$ . Each of these wires has resistance $5 Ω$ and length of each wire is $0.5 m$ . Find the current through the wire $cd$ .

Discussion

13230.	Calculate the change in intensity level when the intensity of sound increases by 106 times its original intensity.
Answer» Calculate the change in intensity level when the intensity of sound increases by $10^{6}$ times its original intensity.

Discussion

13231.	calculate molality of 1.06% w/w Na2CO
Answer» calculate molality of 1.06% w/w Na2CO

Discussion

13232.	A block of mass N is attached with a spring of spring constant K whose other end is aatached with a wall. Initially the spring is in natural length and all the surfaces are friction less then the maximum compression in the spring if a bullet of mass m and velocity U gets embedded in the block
Answer» A block of mass N is attached with a spring of spring constant K whose other end is aatached with a wall. Initially the spring is in natural length and all the surfaces are friction less then the maximum compression in the spring if a bullet of mass m and velocity U gets embedded in the block

Discussion

13233.	Resonance is represented by a:
Answer» Resonance is represented by a:

Discussion

13234.	Two containers A and B contain the same ideal gas at the same temperature and pressure. If volume of container A is twice the volume of container B, then find the ratio of gas molecules present in container A to container B.
Answer» Two containers $A$ and $B$ contain the same ideal gas at the same temperature and pressure. If volume of container $A$ is twice the volume of container $B$ , then find the ratio of gas molecules present in container $A$ to container $B$ .

Discussion

13235.	1g H2 gas expand at STP to occupy double of its original volume. The work done during the process is?
Answer» 1g H2 gas expand at STP to occupy double of its original volume. The work done during the process is?

Discussion

13236.	Why is the constant 4pie multiplied to the permittivity of free space in the constant used in coulombs law?
Answer» Why is the constant 4pie multiplied to the permittivity of free space in the constant used in coulombs law?

Discussion

13237.	When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g = 10m/s2
Answer» When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g = $10 m / s^{2}$

13237.

When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g = 10m/s2

Answer»

When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g = $10 m / s^{2}$

Discussion

13238.	A person climbs up a stationary escalator in 60 second. If s†an ding on the same but escalator running with cons†an t velocity he takes 40 sec. How much time is taken by the person to walk up the moving escalator
Answer» A person climbs up a stationary escalator in 60 second. If s†an ding on the same but escalator running with cons†an t velocity he takes 40 sec. How much time is taken by the person to walk up the moving escalator

Discussion

13239.	A block A of mass 5 kg is placed on a table and connected to another block B of mass 3 kg with a light string passing over a frictionless pulley. The coefficient of friction between the table the block A is 0.4. The block B is suddenly dropped and the string breaks after 3 seconds. What is the total distance covered by block A?
Answer» A block A of mass $5 kg$ is placed on a table and connected to another block B of mass $3 kg$ with a light string passing over a frictionless pulley. The coefficient of friction between the table the block A is $0.4$ . The block B is suddenly dropped and the string breaks after $3$ seconds. What is the total distance covered by block A?

Discussion

13240.	(4) 0.7in the given arrangement all surfaces are smooth, What acceleration should be given to the system, for whichblock m, doesn't slide down?m,Mm2(1) 2gm,m.g(2)m2(3) gm2g(4)m,+m2
Answer» (4) 0.7in the given arrangement all surfaces are smooth, What acceleration should be given to the system, for whichblock m, doesn't slide down?m,Mm2(1) 2gm,m.g(2)m2(3) gm2g(4)m,+m2

Discussion

13241.	when a voltage V equal to vo cos WT is applied across a resistor of resistance are the average power dissipated per cycle in the resistor is given by
Answer» when a voltage V equal to vo cos WT is applied across a resistor of resistance are the average power dissipated per cycle in the resistor is given by

Discussion

13242.	Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge Q, the rightmost, a charge −2Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.
Answer» Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge $Q$ , the rightmost, a charge $- 2 Q$ and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.

Discussion

13243.	19 A vessel of 5 litre contains 1.4g of nitrogen at a temperature 1800K. The pressure of the gas if 30% of its molecules are dissociated into atoms at this temperature is: (A) 4.05 atm (B) 2.025 atm (C) 3.84 atm (D) 1.92 atm
Answer» 19 A vessel of 5 litre contains 1.4g of nitrogen at a temperature 1800K. The pressure of the gas if 30% of its molecules are dissociated into atoms at this temperature is: (A) 4.05 atm (B) 2.025 atm (C) 3.84 atm (D) 1.92 atm

Discussion

13244.	If position of an object is changing as s=7t3+t22+3. Then its acceleration at t=3 sec is
Answer» If position of an object is changing as $s = 7 t^{3} + \frac{t^{2}}{2} + 3$ . Then its acceleration at $t = 3 sec$ is

Discussion

13245.	The dispersive powers of crown and flint glasses are 0.03 and 0.05 respectively. The refractive indices for yellow light for these glasses are 1.517 and 1.621 respectively. It is desired to form an achromatic combination of prisms of crown and flint glasses which can produce a deviation of 1∘ in the yellow ray. Find the refracting angles of the two prisms needed.
Answer» The dispersive powers of crown and flint glasses are $0.03$ and $0.05$ respectively. The refractive indices for yellow light for these glasses are $1.517$ and $1.621$ respectively. It is desired to form an achromatic combination of prisms of crown and flint glasses which can produce a deviation of $1^{\circ}$ in the yellow ray. Find the refracting angles of the two prisms needed.

Discussion

13246.	a body of mass 2kg attached at one end of a light string is rotated along a vertical circle of radius 2m. if the string can withs†an d a maximum tension of 140.6N, the maximum speed with which the stone can be rotated is
Answer» a body of mass 2kg attached at one end of a light string is rotated along a vertical circle of radius 2m. if the string can withs†an d a maximum tension of 140.6N, the maximum speed with which the stone can be rotated is

Discussion

13247.	A double-slit apparatus is immersed in a transparent liquid of refractive index 1.33. The slit separation is 1mm and the distance between the plane of slits and screen is 1.33m. The slits are illuminated by a parallel beam of light whose wavelength in air is 6300∘A. Find the fringe width.
Answer» A double-slit apparatus is immersed in a transparent liquid of refractive index 1.33. The slit separation is 1mm and the distance between the plane of slits and screen is 1.33m. The slits are illuminated by a parallel beam of light whose wavelength in air is $6300 \circ A$ . Find the fringe width.

Discussion

13248.	In Exercise 4.11 obtainthe frequency of revolution of the electron in its circular orbit.Does the answer depend on the speed of the electron? Explain.
Answer» In Exercise 4.11 obtain the frequency of revolution of the electron in its circular orbit. Does the answer depend on the speed of the electron? Explain.

Discussion

13249.	A prism ‘X’ and another ‘Y’ are kept in contact with their refracting angles placed opposite to each other as shown in fig. White light is incident on the combination from the left. Column-I described some situation. Match Column-I with the possible out-comes given in Column-II Column IColumn II(P)The prisms are made of same material and their refracting(1) No deviation,No dispersionangles are equal,ie.,A=A′.The combination will cause(Q)The prisms are made of same material and their refractingangles are not equal,i.e.,A≠A′.The combination will(2) No deviation,Dispersion happenscause.(R)The prisms are made of different material and theirrefracting angles are equali.e.A=A′.Also the quantityμv−μg has different values for the two prisms. Here(3)No dispersion,deviation happensμv and μg are the refractive indices for violet and redcolours.The combination will cause.(S)The prisms are made of different materials and theirrefracting angles are unequal,i.e,A≠A′.AlsoAA′=−(μ′−1)μ−1, where μ is the refractive index for the(4) Both deviation and dispersion happensmean wavelength (yellow) for prism X while μ is thecorresponding value for prism Y.The combination willcause.
Answer» A prism ‘X’ and another ‘Y’ are kept in contact with their refracting angles placed opposite to each other as shown in fig. White light is incident on the combination from the left. Column-I described some situation. Match Column-I with the possible out-comes given in Column-II $Column IColumn II(P)The prisms are made of same material and their refracting(1) No deviation,No dispersionangles are equal,ie.,A=A′.The combination will cause(Q)The prisms are made of same material and their refractingangles are not equal,i.e.,A≠A′.The combination will(2) No deviation,Dispersion happenscause.(R)The prisms are made of different material and theirrefracting angles are equali.e.A=A′.Also the quantityμv−μg has different values for the two prisms. Here(3)No dispersion,deviation happensμv and μg are the refractive indices for violet and redcolours.The combination will cause.(S)The prisms are made of different materials and theirrefracting angles are unequal,i.e,A≠A′.AlsoAA′=−(μ′−1)μ−1, where μ is the refractive index for the(4) Both deviation and dispersion happensmean wavelength (yellow) for prism X while μ is thecorresponding value for prism Y.The combination willcause.$

Discussion

13250.	At what speed will the velocity head of stream will become 40cm?
Answer» At what speed will the velocity head of stream will become 40cm?

Discussion

Explore topic-wise InterviewSolutions in .

two forces eah numerically equal to 10 dynes are acting. then find the resul†an t of these vectors.

If a particle has velocity v(t)=t2−5t+6, the average velocity in 5 sec is

Find →A.→B

What is the constant that relates the strain in a body along perpendicular directions?

A body is displaced from −→rA=(2^i+4^j−2^k) m to −→rB=(8^i+14^j+6^k) m under the action of a constant force →F=(2^i+3^j+6^k) N.If the initial kinetic energy of the body is 15 J, Find the kinetic energy of the body at the end of displacement.

A pure inductor of 26 mH is connected to an ac source of 220 V. Given frequency of the source as 50 Hz, the rms current in the circuit is​​​​​​​[1 Mark]

In the Young's double slit experiment, the distance between the slits varies in time as d(t)=d0+a0 sinωt; where d0,ω and a0 are constants. The difference between the largest fringe width and the smallest fringe width, obtained over time, is given as :

64 Why Delta G naught is not zero

A 100 kg car is moving with a maximum velocity of 9 m/s across a circular track of radius 30 m. The maximum force of friction between the road and the car is

A block of mass 5 kg is released from rest when compression in spring is 2 m. Block is not attached with the spring and natural length of the spring is 4 m. Maximum height of block from ground is (g=10 m/s2)

between two points (0,a) and (a,0) in volt will be

In a hypothetical system of particles a mass m with charge −3q is moving around a very heavy particle having charge q. Assuming Bohr’s model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is

A bullet is fired from a cannon with velocity 500 m/s. If the angle of projection is 15∘ and g=10m/s2. Then the range is

An electron initially at rest is accelerated through a potential difference of 1 V. The energy gained by the electron is:

Two springs A and B having spring constants kA and kB (kA=4kB) are stretched by applying force of equal magnitude. If energy stored in spring A is EA, then energy stored in B will be:

If deutron is accelerated from rest through a potential difference of 10 kilovolt (kv). Find its final speed?

The equivalent resistance between point A and B is-

Question 2Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

If a company pays 12,000$ every day to its all employees, then how much money will the company pay to its all employees in the month of January ?

The temperature at which the speed of sound in air becomes double of its value at 27 degee celsius?

Read the following two statements below carefully and state, with reasons, if it is true or false. (a) The Young’s modulus of rubber is greater than that of steel; (b) The stretching of a coil is determined by its shear modulus.

A pendulum bob of mass 80 mg ,carrying a charge of 2\ast10^{-8} C is at rest in a uniform ,horizontal electric field of 20kV/m.Find tension in the thread?

Calculate the change in intensity level when the intensity of sound increases by 106 times its original intensity.

calculate molality of 1.06% w/w Na2CO

A block of mass N is attached with a spring of spring constant K whose other end is aatached with a wall. Initially the spring is in natural length and all the surfaces are friction less then the maximum compression in the spring if a bullet of mass m and velocity U gets embedded in the block

Resonance is represented by a:

Two containers A and B contain the same ideal gas at the same temperature and pressure. If volume of container A is twice the volume of container B, then find the ratio of gas molecules present in container A to container B.

1g H2 gas expand at STP to occupy double of its original volume. The work done during the process is?

Why is the constant 4pie multiplied to the permittivity of free space in the constant used in coulombs law?

When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g = 10m/s2

A person climbs up a stationary escalator in 60 second. If s†an ding on the same but escalator running with cons†an t velocity he takes 40 sec. How much time is taken by the person to walk up the moving escalator

(4) 0.7in the given arrangement all surfaces are smooth, What acceleration should be given to the system, for whichblock m, doesn't slide down?m,Mm2(1) 2gm,m.g(2)m2(3) gm2g(4)m,+m2

when a voltage V equal to vo cos WT is applied across a resistor of resistance are the average power dissipated per cycle in the resistor is given by

Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge Q, the rightmost, a charge −2Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.

19 A vessel of 5 litre contains 1.4g of nitrogen at a temperature 1800K. The pressure of the gas if 30% of its molecules are dissociated into atoms at this temperature is: (A) 4.05 atm (B) 2.025 atm (C) 3.84 atm (D) 1.92 atm

If position of an object is changing as s=7t3+t22+3. Then its acceleration at t=3 sec is

a body of mass 2kg attached at one end of a light string is rotated along a vertical circle of radius 2m. if the string can withs†an d a maximum tension of 140.6N, the maximum speed with which the stone can be rotated is

A double-slit apparatus is immersed in a transparent liquid of refractive index 1.33. The slit separation is 1mm and the distance between the plane of slits and screen is 1.33m. The slits are illuminated by a parallel beam of light whose wavelength in air is 6300∘A. Find the fringe width.

In Exercise 4.11 obtainthe frequency of revolution of the electron in its circular orbit.Does the answer depend on the speed of the electron? Explain.

At what speed will the velocity head of stream will become 40cm?

A pure inductor of 26 mH is connected to an ac source of 220 V. Given frequency of the source as 50 Hz, the rms current in the circuit is[1 Mark]