50278 + Interview Questions in Physics Page 144 InterviewSolution

7151.	A block of mass 2 kg moving at 2 ms−1 collides head on inelastically with another block of equal mass kept at rest. Find the maximum loss in kinetic energy due to the collision.
Answer» A block of mass $2 kg$ moving at $2 {ms}^{- 1}$ collides head on inelastically with another block of equal mass kept at rest. Find the maximum loss in kinetic energy due to the collision.

Discussion

7152.	A container of volume 50 cc contains air (mean molecular weight = 28.8 g) and is open to atmosphere where the pressure is 100 kPa. The container is kept in a bath containing melting ice (00C). (a) Find the mass of the air in the container when thermal equilibrium is reached. (b) The container is now placed in another bath containing boiling water (1000C). Find the mass of air in the container. (c) The container is now closed and placed in the melting-ice bath. Find the pressure of the air when thermal equilibrium is reached.
Answer» A container of volume 50 cc contains air (mean molecular weight = 28.8 g) and is open to atmosphere where the pressure is 100 kPa. The container is kept in a bath containing melting ice ( $0^{0}$ C). (a) Find the mass of the air in the container when thermal equilibrium is reached. (b) The container is now placed in another bath containing boiling water ( $100^{0}$ C). Find the mass of air in the container. (c) The container is now closed and placed in the melting-ice bath. Find the pressure of the air when thermal equilibrium is reached.

Discussion

7153.	At a place, the earth's horizontal component of magnetic field is 0.38×10−4 T. If the angle of dip at that place is 60∘, then the vertical component of earth's magnetic field at that place will be approximately -
Answer» At a place, the earth's horizontal component of magnetic field is $0.38 \times 10^{- 4} T$ . If the angle of dip at that place is $60^{\circ}$ , then the vertical component of earth's magnetic field at that place will be approximately -

Discussion

7154.	ball of mass 100 kg is thrown upward it Rises to a maximum height of 100m at what height its kinetic energy will reduce to 60%
Answer» ball of mass 100 kg is thrown upward it Rises to a maximum height of 100m at what height its kinetic energy will reduce to 60%

Discussion

7155.	is electrostatic force conservative or non conseervative
Answer» is electrostatic force conservative or non conseervative

Discussion

7156.	A wooden block of mass 20 g is dropped from the top of the cliff 50 m high. Simultaneously a bullet of mass 20 g is fired from the foot of the cliff upwards with a velocity 25 ms−1. The bullet and the wooden block will meet each other at a distance from top of the cliff : (g=10 ms−2)
Answer» A wooden block of mass $20 g$ is dropped from the top of the cliff $50 m$ high. Simultaneously a bullet of mass $20 g$ is fired from the foot of the cliff upwards with a velocity $25 m s^{- 1}$ . The bullet and the wooden block will meet each other at a distance from top of the cliff : ( $g = 10 m s^{- 2}$ )

Discussion

7157.	An astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance of-
Answer» An astronomical telescope has objective and eyepiece of focal lengths $40 cm$ and $4 cm$ respectively. To view an object $200 cm$ away from the objective, the lenses must be separated by a distance of-

Discussion

7158.	A rod AB of length L is hung from two identical wires 1 and 2. A block of mass m is hung at point O of the rod as shown in Fig. The value of x so that a tuning fork excites the fundamental node in wire 1 and the second harmonic in wire 2 is
Answer» A rod AB of length L is hung from two identical wires 1 and 2. A block of mass m is hung at point O of the rod as shown in Fig. The value of x so that a tuning fork excites the fundamental node in wire 1 and the second harmonic in wire 2 is

7158.

A rod AB of length L is hung from two identical wires 1 and 2. A block of mass m is hung at point O of the rod as shown in Fig. The value of x so that a tuning fork excites the fundamental node in wire 1 and the second harmonic in wire 2 is

Answer»

A rod AB of length L is hung from two identical wires 1 and 2. A block of mass m is hung at point O of the rod as shown in Fig. The value of x so that a tuning fork excites the fundamental node in wire 1 and the second harmonic in wire 2 is

Discussion

7159.	A ray of light falls on a transparent sphere with its centre at C, as shown in the figure. The ray emerges from the sphere parallel to the line AB. Then, the refractive index of the sphere is
Answer» A ray of light falls on a transparent sphere with its centre at $C$ , as shown in the figure. The ray emerges from the sphere parallel to the line AB. Then, the refractive index of the sphere is

Discussion

7160.	The frequency (in Hz) of the pulse at Z in the network shown in figure below is __________.5
Answer» The frequency (in Hz) of the pulse at Z in the network shown in figure below is __________. 5

Discussion

7161.	14.A light string passing over a smooth light pulley connects two blocks of masses M1 and M2. If the acceleration of the system is g/8, then the ratio of masses is ? Consider M1> M2
Answer» 14.A light string passing over a smooth light pulley connects two blocks of masses M1 and M2. If the acceleration of the system is g/8, then the ratio of masses is ? Consider M1> M2

Discussion

7162.	A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect ?
Answer» A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect ?

Discussion

7163.	The standard enthalpy of formation of CO2 , H2O and glucose at 25 degree celcius are -400 KJ /mol , -300KJ/mol and - 1300 KJ /mol . The standard enthalpy of combustion per gm of glucose is
Answer» The standard enthalpy of formation of CO2 , H2O and glucose at 25 degree celcius are -400 KJ /mol , -300KJ/mol and - 1300 KJ /mol . The standard enthalpy of combustion per gm of glucose is

Discussion

7164.	Two masses A and B of mass 4 kg and 1 kg respectively are connected with the help of massless inextensible string. Mass A is placed on a rough horizontal table and mass B is hanging with the help of string passing through a smooth hole at the centre of table. For the system to be in equilibrium what can be the minimum value of coefficient of friction?(1) 0.5(2) 0.25(4) 0.125(3) 2.5
Answer» Two masses A and B of mass 4 kg and 1 kg respectively are connected with the help of massless inextensible string. Mass A is placed on a rough horizontal table and mass B is hanging with the help of string passing through a smooth hole at the centre of table. For the system to be in equilibrium what can be the minimum value of coefficient of friction?(1) 0.5(2) 0.25(4) 0.125(3) 2.5

Discussion

7165.	(A body is projected vertically upwards at timet 0.The time corresponding to height h, while ascendingand descending are t-4 s andt 6 s respectively.Then height h is (g= 10 m/s2) (1) 100m (2) 50 m(4) 80 (3) 120 m
Answer» (A body is projected vertically upwards at timet 0.The time corresponding to height h, while ascendingand descending are t-4 s andt 6 s respectively.Then height h is (g= 10 m/s2) (1) 100m (2) 50 m(4) 80 (3) 120 m

Discussion

7166.	A power plant working on Carnot cycle has heat addition at 1000∘C and the cycle is repeated 1100 times per minute. The compression ratio is 10. The work produced is 475 kW.The amount of heat supplied per cycle is ____ kJ/cycle.43.04
Answer» A power plant working on Carnot cycle has heat addition at $1000^{\circ} C$ and the cycle is repeated 1100 times per minute. The compression ratio is 10. The work produced is 475 kW. The amount of heat supplied per cycle is ____ kJ/cycle. 43.04

7166.

A power plant working on Carnot cycle has heat addition at 1000∘C and the cycle is repeated 1100 times per minute. The compression ratio is 10. The work produced is 475 kW.The amount of heat supplied per cycle is ____ kJ/cycle.43.04

Answer»

A power plant working on Carnot cycle has heat addition at $1000^{\circ} C$ and the cycle is repeated 1100 times per minute. The compression ratio is 10. The work produced is 475 kW.

The amount of heat supplied per cycle is ____ kJ/cycle.

43.04

Discussion

7167.	In Young's double slit experiment, if one of the slit is closed fully, what will be visible on the screen?
Answer» In Young's double slit experiment, if one of the slit is closed fully, what will be visible on the screen?

Discussion

7168.	For each of the following experiments write sample space ‘S’ and number of sample points n(S).(1) One coin and one die are thrown simultaneously.(2) Two digit numbers are formed using digits 2, 3 and 5 without repeating a digits.
Answer» For each of the following experiments write sample space ‘S’ and number of sample points n(S). (1) One coin and one die are thrown simultaneously. (2) Two digit numbers are formed using digits 2, 3 and 5 without repeating a digits.

Discussion

7169.	A circuit draws a power of 550 W from a source of 220 V, 50 Hz. The power factor of the circuit is 0.8 and the current lags in phase behind the potential difference. To make the power factor of the circuit as 1.0, what capacitance is needed to be connected in series with it.
Answer» A circuit draws a power of $550 W$ from a source of $220 V$ , $50 Hz$ . The power factor of the circuit is $0.8$ and the current lags in phase behind the potential difference. To make the power factor of the circuit as $1.0$ , what capacitance is needed to be connected in series with it.

Discussion

7170.	Consider a nuclear reaction A+B→C. A nucleus ′A′ moving with kinetic energy of 5 MeV collides with a nucleus ′B′ moving with kinetic energy of 3 MeV and form a nucleus ′C′ in excited state. The kinetic energy of nucleus ′C′ just after its formation is 265N MeV and it is formed in a state with excitation energy of 10 MeV. Find the value of N.[Take masses of nuclei A,B and C as 25,10 and 34.995 amu respectively, 1 amu=930 MeV/c2]
Answer» Consider a nuclear reaction $A + B \to C$ . A nucleus $^{'} A^{'}$ moving with kinetic energy of $5 MeV$ collides with a nucleus $^{'} B^{'}$ moving with kinetic energy of $3 MeV$ and form a nucleus $^{'} C^{'}$ in excited state. The kinetic energy of nucleus $^{'} C^{'}$ just after its formation is $\frac{265}{N} MeV$ and it is formed in a state with excitation energy of $10 MeV$ . Find the value of $N$ . $[$ Take masses of nuclei $A, B$ and $C$ as $25, 10$ and $34.995 amu$ respectively, $1 amu = 930 {MeV/c}^{2}]$

Discussion

7171.	In Rutherford experiment the number of alpha particles scattered through an angle of 90∘ in 28 per minute. Find the number particles scattered through an angle of 60∘ per minute.
Answer» In Rutherford experiment the number of alpha particles scattered through an angle of $90^{\circ}$ in 28 per minute. Find the number particles scattered through an angle of $60^{\circ}$ per minute.

Discussion

7172.	Find the ratio of maximum horizontal range and the maximum height attained by the projectile. i.e angel 45°
Answer» Find the ratio of maximum horizontal range and the maximum height attained by the projectile. i.e angel 45°

Discussion

7173.	M1 and M2 are two plane mirrors which are kept parallel to each other as shown. There is a point O on the perpendicular screen just in front of S. What should be the wavelength of light coming from monochromatic source S, so that a maxima is formed at O due to interference of reflected light from both the mirrors. [consider only 1st reflection and D>>d, d>>λ]
Answer» $M_{1}$ and $M_{2}$ are two plane mirrors which are kept parallel to each other as shown. There is a point $O$ on the perpendicular screen just in front of $S .$ What should be the wavelength of light coming from monochromatic source $S,$ so that a maxima is formed at $O$ due to interference of reflected light from both the mirrors. [consider only 1st reflection and $D >> d, d >> λ$ ]

Discussion

7174.	A sound consists of four frequencies : 200 Hz,400 Hz,1125 Hz and 1600 Hz. A sound filter is made by passing this sound through a bifurcated pipe as shown. The sound wave has to travel a distance 40 cm more in the right branch than in the straight pipe. The speed of sound in air is 300 m/s. which of the given frequencies will almost completely muffle or silence the outlet?
Answer» A sound consists of four frequencies : $200 Hz, 400 Hz, 1125 Hz$ and $1600 Hz$ . A sound filter is made by passing this sound through a bifurcated pipe as shown. The sound wave has to travel a distance $40 cm$ more in the right branch than in the straight pipe. The speed of sound in air is $300 m/s$ . which of the given frequencies will almost completely muffle or silence the outlet?

Discussion

7175.	In a transistor circuit, the base current changes from 30 μ A to 90 μ A. If the current gain of the transistor is 30, the change in the collector current is
Answer» In a transistor circuit, the base current changes from $30 μ A to 90 μ A$ . If the current gain of the transistor is $30$ , the change in the collector current is

Discussion

7176.	A soap bubble of diameter 10 mm has an excess pressure of 50 N/m2. Find the surface tension of soap solution.
Answer» A soap bubble of diameter $10 mm$ has an excess pressure of $50 {N/m}^{2}$ . Find the surface tension of soap solution.

Discussion

7177.	Two blocks of mass 5 kg and 3 kg are tied with a heavy rope of mass 2 kg. An external force of 200 N is applied on 5 kg block and the whole system accelerates upwards. Find the tension at the midpoint of the rope?(Take g= 10 m/s2)
Answer» Two blocks of mass $5 k g$ and $3 k g$ are tied with a heavy rope of mass $2 k g$ . An external force of $200 N$ is applied on $5 k g$ block and the whole system accelerates upwards. Find the tension at the midpoint of the rope? (Take $g = 10 m / s^{2}$ )

Discussion

7178.	250 gm of water and equal volume of alcohol of mass 200 gm are replaced successively in the same calorimeter which cools from 60∘C to 55∘C in 130 seconds and 67 seconds respectively. If the water equivalent of the calorimeter is 10 gm, then the specific heat of alcohol (in cal/g ∘C) is (Assume that rate of heat loss in both the cases remains same)
Answer» $250 gm$ of water and equal volume of alcohol of mass $200 gm$ are replaced successively in the same calorimeter which cools from $60^{\circ} C$ to $55^{\circ} C$ in $130$ seconds and $67$ seconds respectively. If the water equivalent of the calorimeter is $10 gm$ , then the specific heat of alcohol (in ${cal/g}^{\circ} C$ ) is (Assume that rate of heat loss in both the cases remains same)

Discussion

7179.	(4) te0A nonconducting sheet of large surface area andthickness d contains uniform charge distribution ofdensity ρ. The electric field at a point P inside theplate, at a distance x from central plane is2,px3e
Answer» (4) te0A nonconducting sheet of large surface area andthickness d contains uniform charge distribution ofdensity ρ. The electric field at a point P inside theplate, at a distance x from central plane is2,px3e

Discussion

7180.	SHM IN DIPOLE IN UNIFORM AND NON UNIFORM ELECTRIC FIELD
Answer» SHM IN DIPOLE IN UNIFORM AND NON UNIFORM ELECTRIC FIELD

Discussion

7181.	ifincidenr ray is 40degree with respect to normal then what would be the angle between reflected ray and incident ray
Answer» ifincidenr ray is 40degree with respect to normal then what would be the angle between reflected ray and incident ray

Discussion

7182.	"Vena Contracta" is the cross section where the flow area is a minimum for a restriction type flowmeter. For an orifice meter, If d is the diameter of the orifice opening, then the area of the vena contracta is approximately
Answer» "Vena Contracta" is the cross section where the flow area is a minimum for a restriction type flowmeter. For an orifice meter, If d is the diameter of the orifice opening, then the area of the vena contracta is approximately

Discussion

7183.	The variation of electric potential (V) with distance (r) from a fixed point is as shown in the figure. Electric field intensity (in V/m) at r=1 m, 3 m and 4.5 m are respectively
Answer» The variation of electric potential $(V)$ with distance $(r)$ from a fixed point is as shown in the figure. Electric field intensity $(in V/m)$ at $r = 1 m, 3 m$ and $4.5 m$ are respectively

Discussion

7184.	Find the second orderderivatives of the function.
Answer» Find the second order derivatives of the function.

7184.

Find the second orderderivatives of the function.

Answer»

Find the second order
derivatives of the function.

Discussion

7185.	83Bi212 decays with parallel radioactive reactions resulting in 81Ti208 and 84Po212 by emitting α and β particles respectively. The α and β decay processes have decay constants λ1 and λ2. Mean lifetime of 83Bi212 is 500 seconds. If 81Ti208 and 84Po212 are produced in ratio of 9:16 then
Answer» $_{83} {B i}^{212}$ decays with parallel radioactive reactions resulting in $_{81} {Ti}^{208}$ and $_{84} {Po}^{212}$ by emitting $α and β$ particles respectively. The $α and β$ decay processes have decay constants $λ_{1} and λ_{2}$ . Mean lifetime of $_{83} {Bi}^{212}$ is $500$ seconds. If $_{81} {Ti}^{208}$ and $_{84} {Po}^{212}$ are produced in ratio of $9 : 16$ then

Discussion

7186.	24. terminal potential difference (v) of a cell(emf E and internal resistance r) is measured as a function of current(I) flowing through it. The slope and intercept of graph between Vand I then respectively are equal to -r and E how?
Answer» 24. terminal potential difference (v) of a cell(emf E and internal resistance r) is measured as a function of current(I) flowing through it. The slope and intercept of graph between Vand I then respectively are equal to -r and E how?

Discussion

7187.	A 10 g bullet moving at 100 m/s strikes a log. Assume that bullet undergoes uniform deacceleration and stops in 6.0 cm, find the magnitude of average force experienced by the log.
Answer» A $10 g$ bullet moving at $100 m/s$ strikes a log. Assume that bullet undergoes uniform deacceleration and stops in $6.0 cm$ , find the magnitude of average force experienced by the log.

Discussion

7188.	Rain appears to fall vertically downwards to a man moving with a velocity of 4m/sec. When he doubles his speed the rain appears to strike him at an angle 45 degree from horizontal. Then what is the actual velocity of rain drops?
Answer» Rain appears to fall vertically downwards to a man moving with a velocity of 4m/sec. When he doubles his speed the rain appears to strike him at an angle 45 degree from horizontal. Then what is the actual velocity of rain drops?

Discussion

7189.	A hypothetical spring type object, exerts a force dependent on diplacement x, given by 4x3. What is the average force exterted by it while being displaced 2 units from its natural position?
Answer» A hypothetical spring type object, exerts a force dependent on diplacement x, given by $4 x^{3}$ . What is the average force exterted by it while being displaced 2 units from its natural position?

Discussion

7190.	Two tuning fork having frequencies 460 Hz and 454 Hz are turned together.The time interval between successive maximum intensity will be a)1/4 sec b)1/2 sec c)1 sec d)4 sec
Answer» Two tuning fork having frequencies 460 Hz and 454 Hz are turned together.The time interval between successive maximum intensity will be a)1/4 sec b)1/2 sec c)1 sec d)4 sec

Discussion

7191.	The circuit shown is in steady state. Find the charge in capacitor C1.
Answer» The circuit shown is in steady state. Find the charge in capacitor $C_{1}$ .

Discussion

7192.	Does a bulb glow brighter in series or parallel. Why?
Answer» Does a bulb glow brighter in series or parallel. Why?

Discussion

7193.	10 identical cells are connected in series with similar polarity to an external resistance. Current through this resistance is ′I′. Now polarity of two cells are reversed, calculate current through same resistance.
Answer» $10$ identical cells are connected in series with similar polarity to an external resistance. Current through this resistance is $^{'} I^{'}$ . Now polarity of two cells are reversed, calculate current through same resistance.

Discussion

7194.	a ball is dropped from tower if first one third distance is covered in time t then the time taken to cover total distsance will be
Answer» a ball is dropped from tower if first one third distance is covered in time t then the time taken to cover total distsance will be

Discussion

7195.	The electric field in a region is given by →E=25E0^i+35E0^j with E0=4.0×103 N/C. The flux of this field through a rectangular surface area 0.4 m2 parallel to Y– Z plane is (in Nm2C−1)
Answer» The electric field in a region is given by $\to E = \frac{2}{5} E_{0}^i + \frac{3}{5} E_{0}^j$ with $E_{0} = 4.0 \times 10^{3} N/C$ . The flux of this field through a rectangular surface area $0.4 m^{2}$ parallel to Y– Z plane is $({in Nm}^{2} C^{- 1})$

Discussion

7196.	The potential energy of a particle executing SHM changes from maximum to minimum is 5 sec. Then the time period of SHM is
Answer» The potential energy of a particle executing SHM changes from maximum to minimum is $5 sec$ . Then the time period of SHM is

Discussion

7197.	A parallel plate capacitor of plate separation 2 mm is connected to a DC source. If the plate area is 60 cm2, what is the magnitude of displacement current at an instant, when the potential difference across it is varying at the rate of 4×106 V/s
Answer» A parallel plate capacitor of plate separation $2 mm$ is connected to a $D C$ source. If the plate area is $60 {cm}^{2}$ , what is the magnitude of displacement current at an instant, when the potential difference across it is varying at the rate of $4 \times 10^{6} V/s$

Discussion

7198.	A voltmeter has a resistance of G Ω and range V volt. The value of resistance used in series to convert it into voltmeter of range nV volt is
Answer» A voltmeter has a resistance of $G$ $Ω$ and range $V volt$ . The value of resistance used in series to convert it into voltmeter of range $n V volt$ is

Discussion

7199.	37. the heat of combustion of C,S&carbondisulphide -393.3,-293.7&-1108.78KJ.What will be heat of formation of carbondisulphide
Answer» 37. the heat of combustion of C,S&carbondisulphide -393.3,-293.7&-1108.78KJ.What will be heat of formation of carbondisulphide

Discussion

7200.	The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? [3 MARKS]
Answer» The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? [3 MARKS]

Discussion

Explore topic-wise InterviewSolutions in .

A block of mass 2 kg moving at 2 ms−1 collides head on inelastically with another block of equal mass kept at rest. Find the maximum loss in kinetic energy due to the collision.

At a place, the earth's horizontal component of magnetic field is 0.38×10−4 T. If the angle of dip at that place is 60∘, then the vertical component of earth's magnetic field at that place will be approximately -

ball of mass 100 kg is thrown upward it Rises to a maximum height of 100m at what height its kinetic energy will reduce to 60%

is electrostatic force conservative or non conseervative

A wooden block of mass 20 g is dropped from the top of the cliff 50 m high. Simultaneously a bullet of mass 20 g is fired from the foot of the cliff upwards with a velocity 25 ms−1. The bullet and the wooden block will meet each other at a distance from top of the cliff : (g=10 ms−2)

An astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance of-

A rod AB of length L is hung from two identical wires 1 and 2. A block of mass m is hung at point O of the rod as shown in Fig. The value of x so that a tuning fork excites the fundamental node in wire 1 and the second harmonic in wire 2 is

A ray of light falls on a transparent sphere with its centre at C, as shown in the figure. The ray emerges from the sphere parallel to the line AB. Then, the refractive index of the sphere is

The frequency (in Hz) of the pulse at Z in the network shown in figure below is __________.5

14.A light string passing over a smooth light pulley connects two blocks of masses M1 and M2. If the acceleration of the system is g/8, then the ratio of masses is ? Consider M1> M2

A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor, is now inserted in it. Which of the following is incorrect ?

The standard enthalpy of formation of CO2 , H2O and glucose at 25 degree celcius are -400 KJ /mol , -300KJ/mol and - 1300 KJ /mol . The standard enthalpy of combustion per gm of glucose is

(A body is projected vertically upwards at timet 0.The time corresponding to height h, while ascendingand descending are t-4 s andt 6 s respectively.Then height h is (g= 10 m/s2) (1) 100m (2) 50 m(4) 80 (3) 120 m

A power plant working on Carnot cycle has heat addition at 1000∘C and the cycle is repeated 1100 times per minute. The compression ratio is 10. The work produced is 475 kW.The amount of heat supplied per cycle is ____ kJ/cycle.43.04

In Young's double slit experiment, if one of the slit is closed fully, what will be visible on the screen?

For each of the following experiments write sample space ‘S’ and number of sample points n(S).(1) One coin and one die are thrown simultaneously.(2) Two digit numbers are formed using digits 2, 3 and 5 without repeating a digits.

A circuit draws a power of 550 W from a source of 220 V, 50 Hz. The power factor of the circuit is 0.8 and the current lags in phase behind the potential difference. To make the power factor of the circuit as 1.0, what capacitance is needed to be connected in series with it.

In Rutherford experiment the number of alpha particles scattered through an angle of 90∘ in 28 per minute. Find the number particles scattered through an angle of 60∘ per minute.

Find the ratio of maximum horizontal range and the maximum height attained by the projectile. i.e angel 45°

In a transistor circuit, the base current changes from 30 μ A to 90 μ A. If the current gain of the transistor is 30, the change in the collector current is

A soap bubble of diameter 10 mm has an excess pressure of 50 N/m2. Find the surface tension of soap solution.

Two blocks of mass 5 kg and 3 kg are tied with a heavy rope of mass 2 kg. An external force of 200 N is applied on 5 kg block and the whole system accelerates upwards. Find the tension at the midpoint of the rope?(Take g= 10 m/s2)

(4) te0A nonconducting sheet of large surface area andthickness d contains uniform charge distribution ofdensity ρ. The electric field at a point P inside theplate, at a distance x from central plane is2,px3e

SHM IN DIPOLE IN UNIFORM AND NON UNIFORM ELECTRIC FIELD

ifincidenr ray is 40degree with respect to normal then what would be the angle between reflected ray and incident ray

"Vena Contracta" is the cross section where the flow area is a minimum for a restriction type flowmeter. For an orifice meter, If d is the diameter of the orifice opening, then the area of the vena contracta is approximately

The variation of electric potential (V) with distance (r) from a fixed point is as shown in the figure. Electric field intensity (in V/m) at r=1 m, 3 m and 4.5 m are respectively

Find the second orderderivatives of the function.

83Bi212 decays with parallel radioactive reactions resulting in 81Ti208 and 84Po212 by emitting α and β particles respectively. The α and β decay processes have decay constants λ1 and λ2. Mean lifetime of 83Bi212 is 500 seconds. If 81Ti208 and 84Po212 are produced in ratio of 9:16 then

24. terminal potential difference (v) of a cell(emf E and internal resistance r) is measured as a function of current(I) flowing through it. The slope and intercept of graph between Vand I then respectively are equal to -r and E how?

A 10 g bullet moving at 100 m/s strikes a log. Assume that bullet undergoes uniform deacceleration and stops in 6.0 cm, find the magnitude of average force experienced by the log.

Rain appears to fall vertically downwards to a man moving with a velocity of 4m/sec. When he doubles his speed the rain appears to strike him at an angle 45 degree from horizontal. Then what is the actual velocity of rain drops?

A hypothetical spring type object, exerts a force dependent on diplacement x, given by 4x3. What is the average force exterted by it while being displaced 2 units from its natural position?

Two tuning fork having frequencies 460 Hz and 454 Hz are turned together.The time interval between successive maximum intensity will be a)1/4 sec b)1/2 sec c)1 sec d)4 sec

The circuit shown is in steady state. Find the charge in capacitor C1.

Does a bulb glow brighter in series or parallel. Why?

10 identical cells are connected in series with similar polarity to an external resistance. Current through this resistance is ′I′. Now polarity of two cells are reversed, calculate current through same resistance.

a ball is dropped from tower if first one third distance is covered in time t then the time taken to cover total distsance will be

The electric field in a region is given by →E=25E0^i+35E0^j with E0=4.0×103 N/C. The flux of this field through a rectangular surface area 0.4 m2 parallel to Y– Z plane is (in Nm2C−1)

The potential energy of a particle executing SHM changes from maximum to minimum is 5 sec. Then the time period of SHM is

A parallel plate capacitor of plate separation 2 mm is connected to a DC source. If the plate area is 60 cm2, what is the magnitude of displacement current at an instant, when the potential difference across it is varying at the rate of 4×106 V/s

A voltmeter has a resistance of G Ω and range V volt. The value of resistance used in series to convert it into voltmeter of range nV volt is

37. the heat of combustion of C,S&carbondisulphide -393.3,-293.7&-1108.78KJ.What will be heat of formation of carbondisulphide

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? [3 MARKS]