50278 + Interview Questions in Physics Page 232 InterviewSolution

11551.	A particle is moving with speed V along the line Y=3 m. It's angular speed about origin, when it's X coordinate is 4 m is.?
Answer» A particle is moving with speed V along the line Y=3 m. It's angular speed about origin, when it's X coordinate is 4 m is.?

Discussion

11552.	An electron of mass me and a proton of mass mp , where mp = 1836 me are moving with the same speed . The ratio of their de Broglie wavelength i.e λelectronλproton will be :
Answer» An electron of mass $m_{e}$ and a proton of mass $m_{p}$ , where $m_{p}$ $=$ $1836$ $m_{e}$ are moving with the same speed . The ratio of their de Broglie wavelength i.e $\frac{λ_{electron}}{λ_{proton}}$ will be :

Discussion

11553.	What will be the %change in pressure inside a balloon if it's radius is increased by 10%
Answer» What will be the %change in pressure inside a balloon if it's radius is increased by 10%

Discussion

11554.	A potentiometer wire of length 10 m and a resistance 30Ω is connected in series with a battery of emf 2.5 V and internal resistance 5Ω and an external resistance R. If the fall of potential along the potentiometer wire is 50 μV/mm, the value of R is (in Ω)
Answer» A potentiometer wire of length 10 m and a resistance $30 Ω$ is connected in series with a battery of emf 2.5 V and internal resistance $5 Ω$ and an external resistance R. If the fall of potential along the potentiometer wire is $50 μ V / m m$ , the value of R is (in $Ω$ )

Discussion

11555.	Suppose two deuterons must get as close as 10−14 in order for the nuclear force to overcome the repulsive electrostatic force. The height of the electrostatic barrier is nearest to
Answer» Suppose two deuterons must get as close as $10^{- 14}$ in order for the nuclear force to overcome the repulsive electrostatic force. The height of the electrostatic barrier is nearest to

Discussion

11556.	A body falls from a height 'h' on a horizontal surface and rebounds. Then it falls again and rebounds and so on. If the coefficient of restitution is 12, then the total distance travelled by the ball before coming to rest is (neglect air resistance)
Answer» A body falls from a height ' $h$ ' on a horizontal surface and rebounds. Then it falls again and rebounds and so on. If the coefficient of restitution is $\frac{1}{2}$ , then the total distance travelled by the ball before coming to rest is (neglect air resistance)

Discussion

11557.	The velocity - time graph of a body with a constant acceleration is:
Answer» The velocity - time graph of a body with a constant acceleration is:

Discussion

11558.	A rocket is projected straight up and explodes into three equally massive fragments just as it reaches the top of its flight. One of the fragments is observed to come straight down in a time t1, while the other two land together at a time t2, after the burst. If the initial velocity of first segment is v1=g(t22−t21)nt1+t2, find n.
Answer» A rocket is projected straight up and explodes into three equally massive fragments just as it reaches the top of its flight. One of the fragments is observed to come straight down in a time $t_{1}$ , while the other two land together at a time $t_{2}$ , after the burst. If the initial velocity of first segment is $v_{1} = \frac{g (t_{2}^{2} - t_{1}^{2})}{n t_{1} + t_{2}}$ , find $n$ .

Discussion

11559.	A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is 5.0×10−7 m wide, the intensity of the electric field in this region is
Answer» A potential barrier of $0.50 V$ exists across a P-N junction. If the depletion region is $5.0 \times 10^{- 7} m$ wide, the intensity of the electric field in this region is

Discussion

11560.	Consider a head-on collision between two particles of masses m1 and m2.The initial speeds of the particles are u1 and u2 in the same direction.The collision starts at t=0 and the particles interact for a time interval △t.During the collision,the speed of the first particle varies as v(t)=u1+t△t(v1−u1).
Answer» Consider a head-on collision between two particles of masses $m_{1}$ and $m_{2}$ .The initial speeds of the particles are $u_{1}$ and $u_{2}$ in the same direction.The collision starts at t=0 and the particles interact for a time interval $△ t$ .During the collision,the speed of the first particle varies as $v (t) = u_{1} + \frac{t}{△ t} (v_{1} - u_{1}) .$

11560.

Consider a head-on collision between two particles of masses m1 and m2.The initial speeds of the particles are u1 and u2 in the same direction.The collision starts at t=0 and the particles interact for a time interval △t.During the collision,the speed of the first particle varies as v(t)=u1+t△t(v1−u1).

Answer»

Consider a head-on collision between two particles of masses $m_{1}$ and $m_{2}$ .The initial speeds of the particles are $u_{1}$ and $u_{2}$ in the same direction.The collision starts at t=0 and the particles interact for a time interval $△ t$ .During the collision,the speed of the first particle varies as

$v (t) = u_{1} + \frac{t}{△ t} (v_{1} - u_{1}) .$

Discussion

11561.	69.If a particleof mass M starting from rest undergo uniform acceleration. If the speed acquired in time T is V then power delivered to the particle is
Answer» 69.If a particleof mass M starting from rest undergo uniform acceleration. If the speed acquired in time T is V then power delivered to the particle is

Discussion

11562.	A brass boiler has a base area of 0.15 m² and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 10⁹ J s–1 m¯¹ K¯¹; Heat of vaporisation of water = 2256 × 103 J kg¯¹
Answer» A brass boiler has a base area of 0.15 m² and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass = 10⁹ J s–1 m¯¹ K¯¹; Heat of vaporisation of water = 2256 × 103 J kg¯¹

Discussion

11563.	A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,
Answer» A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,

Discussion

11564.	Why does current across a potential difference remain constant although the speed of electron across the potential difference differ? So according to the equation I=neaV, the current should increase since the velocity of electron increase across the potential difference.
Answer» Why does current across a potential difference remain constant although the speed of electron across the potential difference differ? So according to the equation I=neaV, the current should increase since the velocity of electron increase across the potential difference.

Discussion

11565.	A body is projected up a smooth inclined plane (length = 20√2m ) with velocity u from the point M as shown in the figure. The angle of inclination is 45∘ and the top is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of v
Answer» A body is projected up a smooth inclined plane (length = $20 \sqrt{2} m$ ) with velocity u from the point M as shown in the figure. The angle of inclination is $45^{\circ}$ and the top is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of v

11565.

A body is projected up a smooth inclined plane (length = 20√2m ) with velocity u from the point M as shown in the figure. The angle of inclination is 45∘ and the top is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of v

Answer»

A body is projected up a smooth inclined plane (length = $20 \sqrt{2} m$ ) with velocity u from the point M as shown in the figure. The angle of inclination is $45^{\circ}$ and the top is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of v

Discussion

11566.	What is the relation between refractive indices μ,μ1 and μ2 if the behaviour of light rays is as shown in figure.
Answer» What is the relation between refractive indices $μ, μ_{1}$ and $μ_{2}$ if the behaviour of light rays is as shown in figure.

Discussion

11567.	6.At any instant, the velocity and acceleration of a particle moving along a straight line are v and a. The speedof the particle is increasing if(1) v 0, a> 0(2) V< 0, a>0(3) v>0, a0
Answer» 6.At any instant, the velocity and acceleration of a particle moving along a straight line are v and a. The speedof the particle is increasing if(1) v 0, a> 0(2) V< 0, a>0(3) v>0, a0

Discussion

11568.	A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected in parallel with unlike polarities connected together. This combination is connected to 10Ω resistor,. The Current in the 10Ω resistor is 1) 0.27A 2) 0.05A 3) 0.25A 4) 0.3A
Answer» A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected in parallel with unlike polarities connected together. This combination is connected to 10Ω resistor,. The Current in the 10Ω resistor is 1) 0.27A 2) 0.05A 3) 0.25A 4) 0.3A

11568.

A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected in parallel with unlike polarities connected together. This combination is connected to 10Ω resistor,. The Current in the 10Ω resistor is 1) 0.27A 2) 0.05A 3) 0.25A 4) 0.3A

Answer»

A 5V battery with internal resistance 2Ω and a 2V battery with internal resistance 1Ω are connected in parallel with unlike polarities connected together. This combination is connected to 10Ω resistor,. The Current in the 10Ω resistor is

1) 0.27A

2) 0.05A

3) 0.25A

4) 0.3A

Discussion

11569.	How many electrons per second pass through a section of resistance of 2 Ω across which a potential difference of<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->64 V is applied?
Answer» How many electrons per second pass through a section of resistance of $2 Ω$ across which a potential difference of <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $64 V$ is applied?

Discussion

11570.	A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be (ρair=1.2 kg/m3).
Answer» A wind with speed $40 m/s$ blows parallel to the roof of a house. The area of the roof is $250 m^{2}$ . Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be $(ρ_{a i r} = 1.2 {kg/m}^{3})$ .

Discussion

11571.	Entropy change =ds=heat added or releasedtemperature We can say ds=dQT. If we plot entropy-temperature graph (S - T), then which of the curve resembles with carnot cycle?
Answer» Entropy change $= d s = \frac{h e a t a d d e d o r r e l e a s e d}{t e m p e r a t u r e}$ We can say $d s = \frac{d Q}{T} .$ If we plot entropy-temperature graph (S - T), then which of the curve resembles with carnot cycle?

Discussion

11572.	7.What is the main difference between potential and potential energy with respect to definition?
Answer» 7.What is the main difference between potential and potential energy with respect to definition?

Discussion

11573.	Why is the photodiode always operated under reverse bias conditions ? What would happen if it were to be operated under forward bias conditions ?
Answer» Why is the photodiode always operated under reverse bias conditions ? What would happen if it were to be operated under forward bias conditions ?

Discussion

11574.	(a) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = 0) of the configuration. Show that the equilibrium of the test charge is necessarily unstable. (b) Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart.
Answer» (a) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = 0) of the configuration. Show that the equilibrium of the test charge is necessarily unstable. (b) Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart.

11574.

(a) Consider an arbitrary electrostatic field configuration. A small test charge is placed at a null point (i.e., where E = 0) of the configuration. Show that the equilibrium of the test charge is necessarily unstable. (b) Verify this result for the simple configuration of two charges of the same magnitude and sign placed a certain distance apart.

Answer»

(a)
Consider an arbitrary electrostatic field configuration. A small
test charge is placed at a null point (i.e., where E
= 0) of the configuration. Show that
the equilibrium of the test charge is necessarily unstable.

(b) Verify
this result for the simple configuration of two charges of the same
magnitude and sign placed a certain distance apart.

Discussion

11575.	How to determine direction of motion and direction of acceleration of a particle in a mechanical wave ?
Answer» How to determine direction of motion and direction of acceleration of a particle in a mechanical wave ?

Discussion

11576.	the position of a particle from origin moving with acceleration a= 2t+4t^2 at t =4sec is given at t=0, v=0,x=0
Answer» the position of a particle from origin moving with acceleration a= 2t+4t^2 at t =4sec is given at t=0, v=0,x=0

Discussion

11577.	The resistance in the two arms of the meter bridge are 5 Ω and R Ω respectively, balance point is at l1 from left end. When the resistance R is shunted with an equal resistance the new balance point is 1.6l1. The resistance R is
Answer» The resistance in the two arms of the meter bridge are $5 Ω$ and $R Ω$ respectively, balance point is at $l_{1}$ from left end. When the resistance $R$ is shunted with an equal resistance the new balance point is $1.6 l_{1}$ . The resistance $R$ is

Discussion

11578.	A very small circular loop of area 5×10−4 m2 of resistance 2 Ω and negligible inductance is initially coplanar and concentric with a much larger fixed circular loop of radius 0.1 m. A constant current of 1 A is passed in the bigger loop and the smaller loop is rotated with angular velocity 1 rad/s about a diameter. Calculate the maximum flux linked with the smaller loop.
Answer» A very small circular loop of area $5 \times 10^{- 4} m^{2}$ of resistance $2 Ω$ and negligible inductance is initially coplanar and concentric with a much larger fixed circular loop of radius $0.1 m$ . A constant current of $1 A$ is passed in the bigger loop and the smaller loop is rotated with angular velocity $1 rad/s$ about a diameter. Calculate the maximum flux linked with the smaller loop.

Discussion

11579.	a stone is projected vertically upwards from a point on the ground with a velocity of 20ms inverse1.two seconds later another stone is projected fro the same point with the same velocity.when and where will the two stones meet? (g=10ms inverse2)
Answer» a stone is projected vertically upwards from a point on the ground with a velocity of 20ms inverse1.two seconds later another stone is projected fro the same point with the same velocity.when and where will the two stones meet? (g=10ms inverse2)

Discussion

11580.	If is the current flows from case 1 east to west, case 2 west to east, case 3 north to south and case 4 south to north then the find the direction of magnetic field in each case?
Answer» If is the current flows from case 1 east to west, case 2 west to east, case 3 north to south and case 4 south to north then the find the direction of magnetic field in each case?

Discussion

11581.	If unit vectors ^A and ^B are inclined at an angle θ, then \|^A−^B\| is equal to
Answer» If unit vectors $^A$ and $^B$ are inclined at an angle $θ$ , then $\|^A -^B \|$ is equal to

Discussion

11582.	consider a circular ring of redius r uniformly charged with linear charg dencity λ .Find the electric potential at a point on the axis at a dis†an ce x from the center of the ring.
Answer» consider a circular ring of redius r uniformly charged with linear charg dencity λ .Find the electric potential at a point on the axis at a dis†an ce x from the center of the ring.

Discussion

11583.	if the unit of force is 1 kilonewton, the length is 1km and time is 100 second what will be the unit of mass
Answer» if the unit of force is 1 kilonewton, the length is 1km and time is 100 second what will be the unit of mass

Discussion

11584.	A bar magnet has a length 8 cm. The magnetic field at a point at a distance 3 cm from the centre in the broad- side (or equatorial) on position is found to be 4×10−6 T. Find the pole strength of the magnet.
Answer» A bar magnet has a length $8 cm$ . The magnetic field at a point at a distance $3 cm$ from the centre in the broad- side (or equatorial) on position is found to be $4 \times 10^{- 6} T$ . Find the pole strength of the magnet.

Discussion

11585.	20 Nm torque is applied to a flywheel that rotates about a fixed axis and has moment of inertia of 25 kgm2. If the flywheel is initially at rest, what is its angular velocity after it has turned through 10 revolutions?
Answer» $20 Nm$ torque is applied to a flywheel that rotates about a fixed axis and has moment of inertia of $25 {kgm}^{2}$ . If the flywheel is initially at rest, what is its angular velocity after it has turned through $10$ revolutions?

Discussion

11586.	Sand is being dropped on a conveyor belt at the rate of M Kg/s the force necessary to keep the belt moving with a cons†an t velocity of v m/s will be
Answer» Sand is being dropped on a conveyor belt at the rate of M Kg/s the force necessary to keep the belt moving with a cons†an t velocity of v m/s will be

Discussion

11587.	The potential at a distance R/2 from the centre of a conducting sphere of radius R containing charge Q will be
Answer» The potential at a distance $R / 2$ from the centre of a conducting sphere of radius $R$ containing charge $Q$ will be

Discussion

11588.	The centre of curvature of a convex lens is at 40 cm and its central portion is wrapped in black paper as shown below. If an object is placed at 90 cm, find the nature of image formed.
Answer» The centre of curvature of a convex lens is at $40 c m$ and its central portion is wrapped in black paper as shown below. If an object is placed at $90 c m$ , find the nature of image formed.

Discussion

11589.	HEAT: Multi Correct: Two spheres A and B having radii rA and rB where rB =2rA emit radiations with peak intensities at wave lengths 400 nm and 800 nm respectively. If their temperature are TA and TB respectively in Kelvin scale, their emissive powers are EA and EB and energies emitted per second are PA and PB then A. TA / TB = 2 B. PA / PB = 4 C. EA / EB = 8 D. EA / EB = 4
Answer» HEAT: Multi Correct: Two spheres A and B having radii rA and rB where rB =2rA emit radiations with peak intensities at wave lengths 400 nm and 800 nm respectively. If their temperature are TA and TB respectively in Kelvin scale, their emissive powers are EA and EB and energies emitted per second are PA and PB then A. TA / TB = 2 B. PA / PB = 4 C. EA / EB = 8 D. EA / EB = 4

Discussion

11590.	In a building there are 15 bulbs of 45 W,15 bulbs of 100 W,15 small fans of 10 W and 2 heaters of 1 kW. The voltage of electric main is 220 V. The minimum fuse capacity (rated value) of the building will be:
Answer» In a building there are $15$ bulbs of $45 W, 15$ bulbs of $100 W, 15$ small fans of $10 W$ and $2$ heaters of $1 kW$ . The voltage of electric main is $220 V$ . The minimum fuse capacity (rated value) of the building will be:

Discussion

11591.	A stone is thrown vertically upward with an initial velocity v_{0.}The dis†an ce travelled by it in time (4v_0/3g)
Answer» A stone is thrown vertically upward with an initial velocity v_{0.}The dis†an ce travelled by it in time (4v_0/3g)

Discussion

11592.	Find out the value of object distance x, such that image will form at the object position.(Assume lens to be thin)
Answer» Find out the value of object distance $x$ , such that image will form at the object position. (Assume lens to be thin)

Discussion

11593.	If tension is increased by 4% in vibrating string, then percentage change in speed of wave will be
Answer» If tension is increased by $4 %$ in vibrating string, then percentage change in speed of wave will be

Discussion

11594.	A particle is thrown upwards with speed v0. Find its speed when it reaches 2/3rd of the maximum height.
Answer» A particle is thrown upwards with speed $v_{0}$ . Find its speed when it reaches $2 / 3^{r d}$ of the maximum height.

Discussion

11595.	The frequency of oscillation of an electric dipole having dipole moment p and rotational inertia I, oscillating in a uniform electric field E is given
Answer» The frequency of oscillation of an electric dipole having dipole moment p and rotational inertia I, oscillating in a uniform electric field E is given

Discussion

11596.	Two particles of mass 6 kg and 24 kg are separated by a certain distance. The ratio of distance of COM from 6 kg mass and that from 24 kg mass will be
Answer» Two particles of mass $6 kg$ and $24 kg$ are separated by a certain distance. The ratio of distance of COM from $6 kg$ mass and that from $24 kg$ mass will be

Discussion

11597.	If velocity is constant speed and acceleration will be ?
Answer» If velocity is constant speed and acceleration will be ?

Discussion

11598.	The temperature at which pressure of molecules of a liquid becomes equal to the atmospheric pressure is called its
Answer» The temperature at which pressure of molecules of a liquid becomes equal to the atmospheric pressure is called its

Discussion

11599.	A neutral particle is at rest in a uniform magnetic field →B. At t=0, particle explodes into two particles, each of mass m and one of them have charge q. Both of these move off in separate paths lying in plane perpendicular to →B. After time t, both particles collide, then t will be:
Answer» A neutral particle is at rest in a uniform magnetic field $\to B$ . At $t = 0$ , particle explodes into two particles, each of mass $m$ and one of them have charge $q$ . Both of these move off in separate paths lying in plane perpendicular to $\to B$ . After time $t$ , both particles collide, then $t$ will be:

Discussion

11600.	More than One Answer Typeएक से अधिक उत्तर प्रकार के प्रश्नA particle is thrown horizontally with velocity u from top of tower of height h. Which of the following graph(s) is/are correct?एक कण को h ऊँचाई की मीनार के शिखर से u वेग से क्षैतिज रूप से फेंका जाता है। निम्नलिखित में से कौनसा/कौनसे आरेख सही है/हैं?
Answer» More than One Answer Type एक से अधिक उत्तर प्रकार के प्रश्न A particle is thrown horizontally with velocity u from top of tower of height h. Which of the following graph(s) is/are correct? एक कण को h ऊँचाई की मीनार के शिखर से u वेग से क्षैतिज रूप से फेंका जाता है। निम्नलिखित में से कौनसा/कौनसे आरेख सही है/हैं?

Discussion

Explore topic-wise InterviewSolutions in .

A particle is moving with speed V along the line Y=3 m. It's angular speed about origin, when it's X coordinate is 4 m is.?

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If unit vectors ^A and ^B are inclined at an angle θ, then |^A−^B| is equal to

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The temperature at which pressure of molecules of a liquid becomes equal to the atmospheric pressure is called its

A neutral particle is at rest in a uniform magnetic field →B. At t=0, particle explodes into two particles, each of mass m and one of them have charge q. Both of these move off in separate paths lying in plane perpendicular to →B. After time t, both particles collide, then t will be:

How many electrons per second pass through a section of resistance of 2 Ω across which a potential difference of64 V is applied?