50278 + Interview Questions in Physics Page 35 InterviewSolution

1701.	The velocity of a body moving in a straight line at the end of 5 sec is 30m/s,at the end of 12sec is 58m/s and at the end of 22sec,it is 98m/s the body is moving with 1Uniform velocity 2 Uniform acceleration 3 Zero velocity 4 Uniform retardation
Answer» The velocity of a body moving in a straight line at the end of 5 sec is 30m/s,at the end of 12sec is 58m/s and at the end of 22sec,it is 98m/s the body is moving with 1Uniform velocity 2 Uniform acceleration 3 Zero velocity 4 Uniform retardation

Discussion

1702.	13. A wire is bent in the form of a regular pentagon of edge length a. A total of charge q is distributed over it.Find the electric field at the centre of the pentagon
Answer» 13. A wire is bent in the form of a regular pentagon of edge length a. A total of charge q is distributed over it.Find the electric field at the centre of the pentagon

Discussion

1703.	the motion of a charged particle can be used to distinguish between a magnetic field and electric field in a certain region by firing the charge
Answer» the motion of a charged particle can be used to distinguish between a magnetic field and electric field in a certain region by firing the charge

Discussion

1704.	25.A wheel of inertia 4 kg meter-square about its symmetrical axis, rotates at rate of 240 rpm about it. The torque which can stop the rotation of the wheel in one mintues is
Answer» 25.A wheel of inertia 4 kg meter-square about its symmetrical axis, rotates at rate of 240 rpm about it. The torque which can stop the rotation of the wheel in one mintues is

Discussion

1705.	The power developed in an unknown resistance R is same as the power developed in the resistance of 8 ohm when these are connected separately across a battery of internal resistance 4 ohm.The value of R is
Answer» The power developed in an unknown resistance R is same as the power developed in the resistance of 8 ohm when these are connected separately across a battery of internal resistance 4 ohm.The value of R is

Discussion

1706.	In order to raise a mass of 100 kg, a man ofmass 60 kg fastens a rope to it and passesthere rope over a smooth pulley. He climbsthe rope with acceleration 5g/4 relative tothe rope. The tension is the rope is (take10 ms2)TIZELLТАAT
Answer» In order to raise a mass of 100 kg, a man ofmass 60 kg fastens a rope to it and passesthere rope over a smooth pulley. He climbsthe rope with acceleration 5g/4 relative tothe rope. The tension is the rope is (take10 ms2)TIZELLТАAT

Discussion

1707.	A boy walks to his school at a distance of 6 km with constant speed of2.5 kmhr and walks back with a constant speed of 4 kmhr. His average speed for round trip expressed in kmhr, is
Answer» A boy walks to his school at a distance of 6 km with constant speed of2.5 $\frac{k m}{h r}$ and walks back with a constant speed of 4 $\frac{k m}{h r}$ . His average speed for round trip expressed in $\frac{k m}{h r}$ , is

Discussion

1708.	Point source of light of power P is kept above a table at a distance R. If C is the speed of light it and Epsilon Not in the permittivity then amplitude of electric field at distance R is
Answer» Point source of light of power P is kept above a table at a distance R. If C is the speed of light it and Epsilon Not in the permittivity then amplitude of electric field at distance R is

Discussion

1709.	A wire of fixed length is wound on a solenoid of length ‘ℓ′ and radius ‘r’. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length ℓ2 and r2, then the self inductance will be:
Answer» A wire of fixed length is wound on a solenoid of length $‘ ℓ^{'}$ and radius ‘r’. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length $\frac{ℓ}{2}$ and $\frac{r}{2}$ , then the self inductance will be:

Discussion

1710.	Find the value of d(√x +1/√x) /dx
Answer» Find the value of d(√x +1/√x) /dx

Discussion

1711.	Identify the incorrect displacement-time curve which does not represent motion in one dimension.
Answer» Identify the incorrect displacement-time curve which does not represent motion in one dimension.

Discussion

1712.	An electric flux of -6 × 10 to the power -3 Nm*m/C passes normally through a spherical Gaussian surface of radius 10 cm, due to a point charge placed at its centre.a) If the radius of the Gaussian surface is doubled, how much flux would pass through the surface
Answer» An electric flux of -6 × 10 to the power -3 Nm*m/C passes normally through a spherical Gaussian surface of radius 10 cm, due to a point charge placed at its centre. a) If the radius of the Gaussian surface is doubled, how much flux would pass through the surface

Discussion

1713.	A Hall effect transducer is used for the measurement of a magnetic field of 0.5(Wb/m2). The 2mm thick slab is made of bismuth for which the Hall's co-efficient is −1×10−6(Vm/(A Wbm−2)) the current is 3A, the output voltage (in mV) is _____-0.75
Answer» A Hall effect transducer is used for the measurement of a magnetic field of $0.5 (W b / m^{2})$ . The 2mm thick slab is made of bismuth for which the Hall's co-efficient is $- 1 \times 10^{- 6} (V m / (A W b m^{- 2}))$ the current is 3A, the output voltage (in mV) is _____ -0.75

Discussion

1714.	The wire PQ has mass 0.5 kg and resistance 2 Ω, can slide on the smooth, very long horizontal parallel rails separated by a distance of 1 m. The resistance of the rails is negligible. A uniform magnetic field of magnitude 0.6 T exists in the rectangular region, and a resistance of 3 Ω connects the rails outside the field region. At t=0, the wire PQ is pushed towards the right with a speed v=5 m/s. Find the maximum distance the wire will move.
Answer» The wire $PQ$ has mass $0.5 kg$ and resistance $2 Ω$ , can slide on the smooth, very long horizontal parallel rails separated by a distance of $1 m$ . The resistance of the rails is negligible. A uniform magnetic field of magnitude $0.6 T$ exists in the rectangular region, and a resistance of $3 Ω$ connects the rails outside the field region. At $t = 0$ , the wire $PQ$ is pushed towards the right with a speed $v = 5 m/s$ . Find the maximum distance the wire will move.

Discussion

1715.	Consider the signal space representation of a 4-ary modulation scheme as shown in the figure below:If the symbols s0,s1,s2 and s3 are occurring with probabilities 0.3,0.2,0.4 and 0.1 respectively, then the average symbols energy of the modulation scheme will be equal to
Answer» Consider the signal space representation of a 4-ary modulation scheme as shown in the figure below: If the symbols $s_{0}, s_{1}, s_{2}$ and $s_{3}$ are occurring with probabilities 0.3,0.2,0.4 and 0.1 respectively, then the average symbols energy of the modulation scheme will be equal to

Discussion

1716.	In deriving the single slit diffraction pattern, it was stated that theintensity is zero at angles of nλ/a. Justify this by suitably dividingthe slit to bring out the cancellation.
Answer» In deriving the single slit diffraction pattern, it was stated that theintensity is zero at angles of nλ/a. Justify this by suitably dividingthe slit to bring out the cancellation.

Discussion

1717.	Two particles having mass ratio n:1 are interconnected by a light inextensible string that passes over a smooth pulley. If system is released then acceleration of centre of mass of the particle system is?
Answer» Two particles having mass ratio n:1 are interconnected by a light inextensible string that passes over a smooth pulley. If system is released then acceleration of centre of mass of the particle system is?

Discussion

1718.	A mild steel wire of length 1.0 m and cross-sectional area 0.50 × 10¯² cm² is stretched, well within its elastic limit, horizontally between two pillars. A mass of 100 g is suspended from the mid-point of the wire. Calculate the depression at the midpoint.
Answer» A mild steel wire of length 1.0 m and cross-sectional area 0.50 × 10¯² cm² is stretched, well within its elastic limit, horizontally between two pillars. A mass of 100 g is suspended from the mid-point of the wire. Calculate the depression at the midpoint.

Discussion

1719.	If intensity of each wave in the observed interference pattern in Young's double slit experiment is I0, then for some point P where the phase difference is ϕ, resultant intensity I will be:
Answer» If intensity of each wave in the observed interference pattern in Young's double slit experiment is $I_{0}$ , then for some point P where the phase difference is $ϕ$ , resultant intensity $I$ will be:

Discussion

1720.	a:if tge average velocity of a particle is zero in a tike interval,it is possible that the ins†an†an eous velocity is never zero in the interval r:if the average velocity of a pqrticle moving on a straight line is zero in a tike interval then qtleast for one moment the ins†an t†an eous velocity will alsi be zero in the intetval
Answer» a:if tge average velocity of a particle is zero in a tike interval,it is possible that the ins†an†an eous velocity is never zero in the interval r:if the average velocity of a pqrticle moving on a straight line is zero in a tike interval then qtleast for one moment the ins†an t†an eous velocity will alsi be zero in the intetval

Discussion

1721.	Figure shows a wire ab of length l and resistance R which can slide on a smooth pair of rails in a uniform magnetic field B. Ig is a current generator which supplies a constant current i in the circuit. If the wire ab slides at a speed v towards the right, find the potential difference Va−Vb.
Answer» Figure shows a wire $a b$ of length $l$ and resistance $R$ which can slide on a smooth pair of rails in a uniform magnetic field $B$ . $I_{g}$ is a current generator which supplies a constant current $i$ in the circuit. If the wire $a b$ slides at a speed $v$ towards the right, find the potential difference $V_{a} - V_{b}$ .

Discussion

1722.	nta uniform ladder of length 3.25m and weighing 250N is placed againsts a smooth vertical wall with its lower end 1.25m from the wall. If coefficient of friction between the ladder and the floor is 0.3 then, find the frictional force acting on the ladder at the point of contact between ladder and floorn
Answer» nta uniform ladder of length 3.25m and weighing 250N is placed againsts a smooth vertical wall with its lower end 1.25m from the wall. If coefficient of friction between the ladder and the floor is 0.3 then, find the frictional force acting on the ladder at the point of contact between ladder and floorn

Discussion

1723.	speed v of a particle of mass m moving on a circular path of radius r depends on the distance travelled x as v=kx. The tangential force acting on the particle when it travels a distance x( k is a constant).
Answer» speed v of a particle of mass m moving on a circular path of radius r depends on the distance travelled x as v=kx. The tangential force acting on the particle when it travels a distance x( k is a constant).

Discussion

1724.	A beaker is filled with liquid having surface tension 0.07 N/m. If a bubble of radius 0.5 mm is formed at depth h=1 m below the free surface, then find difference between the pressure acting inside the bubble and free surface.(Density of liquid is 1000 kg /m3)
Answer» A beaker is filled with liquid having surface tension $0.07 N/m$ . If a bubble of radius $0.5 mm$ is formed at depth $h = 1 m$ below the free surface, then find difference between the pressure acting inside the bubble and free surface. (Density of liquid is $1000 {kg /m}^{3})$

Discussion

1725.	A closed coil having 50 turns, area 300 cm2, is rotated from a position where its plane makes an angle of 60∘ with a magnetic field of flux density 2.0 T to a position perpendicular to the field in a time of 10 s. What is the average emf induced in the coil?
Answer» A closed coil having $50 turns$ , area $300 {cm}^{2}$ , is rotated from a position where its plane makes an angle of $60^{\circ}$ with a magnetic field of flux density $2.0 T$ to a position perpendicular to the field in a time of $10 s$ . What is the average $emf$ induced in the coil?

Discussion

1726.	Find the derivative of a+bsinxc+dcosx where a,b,c,d are fixed non-zero constants.
Answer» Find the derivative of $\frac{a + b sin x}{c + d cos x}$ where $a, b, c, d$ are fixed non-zero constants.

Discussion

1727.	After the drop detaches, its surface energy is
Answer» After the drop detaches, its surface energy is

Discussion

1728.	the magnitude of change in velocity of a particle having speed v is v during a time period
Answer» the magnitude of change in velocity of a particle having speed v is v during a time period

Discussion

1729.	a block of mass 10 kg is placed on a rough inclined plane of coefficient of friction 0.8 of an angle of inclination of 30 what is the friction force
Answer» a block of mass 10 kg is placed on a rough inclined plane of coefficient of friction 0.8 of an angle of inclination of 30 what is the friction force

Discussion

1730.	ntShow that the angular momentum about any point of a single particle moving with constant velocity remains constant throughtout the the motion .n
Answer» ntShow that the angular momentum about any point of a single particle moving with constant velocity remains constant throughtout the the motion .n

Discussion

1731.	In the given circuit, if point C is connected to the earth and a potential of 2000 V is given to point A. The potential at B is
Answer» In the given circuit, if point $C$ is connected to the earth and a potential of $2000 V$ is given to point $A$ . The potential at $B$ is

Discussion

1732.	In a 100 kV, 60 Hz system, the reactance and capacitance up to the location of circuit breaker are 4Ω and 0.02 μF respectively. The maximum value of RRRV will be
Answer» In a 100 kV, 60 Hz system, the reactance and capacitance up to the location of circuit breaker are $4 Ω a n d 0.02 μ F$ respectively. The maximum value of RRRV will be

Discussion

1733.	A circular ring carries a charge Q . The position (x) of another charge q on the axis of circular ring so that it experiences a maximum force is (R is radius of ring) ?
Answer» A circular ring carries a charge Q . The position (x) of another charge q on the axis of circular ring so that it experiences a maximum force is (R is radius of ring) ?

Discussion

1734.	An object of mass M is divided into two parts ,which are placed at a distance of d .if the gravitational force of attraction is maximum between parts ,then find the ratio of mass of both parts
Answer» An object of mass M is divided into two parts ,which are placed at a distance of d .if the gravitational force of attraction is maximum between parts ,then find the ratio of mass of both parts

Discussion

1735.	A block of mass m1 lies on top of fixed wedge as shown in figure-1 and another block of mass m2 lies on top of wedge which is free to move as shown in figure-2. At time t = 0, both the blocks are released from rest from a vertical height h above the respective horizontal surface on which the wedge is placed as shown. There is no friction between block and wedge in both the figures. Let T1 and T2 be he time taken by block in figure-1 and block in figure - 2 respectively to just reach the horizontal surface, then:
Answer» A block of mass $m_{1}$ lies on top of fixed wedge as shown in figure-1 and another block of mass $m_{2}$ lies on top of wedge which is free to move as shown in figure-2. At time t = 0, both the blocks are released from rest from a vertical height h above the respective horizontal surface on which the wedge is placed as shown. There is no friction between block and wedge in both the figures. Let $T_{1}$ and $T_{2}$ be he time taken by block in figure-1 and block in figure - 2 respectively to just reach the horizontal surface, then:

1735.

A block of mass m1 lies on top of fixed wedge as shown in figure-1 and another block of mass m2 lies on top of wedge which is free to move as shown in figure-2. At time t = 0, both the blocks are released from rest from a vertical height h above the respective horizontal surface on which the wedge is placed as shown. There is no friction between block and wedge in both the figures. Let T1 and T2 be he time taken by block in figure-1 and block in figure - 2 respectively to just reach the horizontal surface, then:

Answer»

A block of mass $m_{1}$ lies on top of fixed wedge as shown in figure-1 and another block of mass $m_{2}$ lies on top of wedge which is free to move as shown in figure-2. At time t = 0, both the blocks are released from rest from a vertical height h above the respective horizontal surface on which the wedge is placed as shown. There is no friction between block and wedge in both the figures. Let $T_{1}$ and $T_{2}$ be he time taken by block in figure-1 and block in figure - 2 respectively to just reach the horizontal surface, then:

Discussion

1736.	The switch S in the circuit is connected with point a for a very long time, then it is shifted to position b. The resulting current through the inductor is shown by curves in the graph for four sets of values for the resistance R and inductance L (given in column 1). Which set corresponds with which curve?Column IColumn IIi.R=R0 and L=L0a.Iii.R=2R0 and L=L0b.IIiii.R=R0 and L=2L0c.IIIiv.R=2R0 and L=2L0d.IV
Answer» The switch $S$ in the circuit is connected with point a for a very long time, then it is shifted to position $b$ . The resulting current through the inductor is shown by curves in the graph for four sets of values for the resistance $R$ and inductance $L$ (given in column 1). Which set corresponds with which curve? $\begin{matrix} Column I & Column II i . R = R_{0} and L = L_{0} & a . I i i . R = 2 R_{0} and L = L_{0} & b . I I i i i . R = R_{0} and L = 2 L_{0} & c . I I I i v . R = 2 R_{0} and L = 2 L_{0} & d . I V \end{matrix}$

Discussion

1737.	Q. A concave mirror if focal length 100cm is used to obtain the image of sun which subtends an angle 30'. The diameter of the image of sun. A. 1.74. B. 0.87 C. 0.435 D. 100
Answer» Q. A concave mirror if focal length 100cm is used to obtain the image of sun which subtends an angle 30'. The diameter of the image of sun. A. 1.74. B. 0.87 C. 0.435 D. 100

Discussion

1738.	A bird moves from point (1m,-2m,3m) to (4m, 2m, 3m).If the speed of the bird is 10m/s then find the velocity vector of the bird in m/s. Also find the vector product of AB if a vector A points vertically upwards and B points towards north .
Answer» A bird moves from point (1m,-2m,3m) to (4m, 2m, 3m).If the speed of the bird is 10m/s then find the velocity vector of the bird in m/s. Also find the vector product of AB if a vector A points vertically upwards and B points towards north .

Discussion

1739.	The mass of the sphere is 3.2×10−14 kg and it carries a net charge equal to that of 10 electrons. If the electronic charge is −1.6×10−19 C and the acceleration of free fall is 10ms−2 the field required to keep the sphere stationary is
Answer» The mass of the sphere is $3.2 \times 10^{- 14} k g$ and it carries a net charge equal to that of 10 electrons. If the electronic charge is $- 1.6 \times 10^{- 19} C$ and the acceleration of free fall is $10 m s^{- 2}$ the field required to keep the sphere stationary is

Discussion

1740.	Average total energy density for a transverse wave is 16 J/m. The average kinetic energy density for the corresponding wave will be
Answer» Average total energy density for a transverse wave is $16 J/m$ . The average kinetic energy density for the corresponding wave will be

Discussion

1741.	A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be[ISM Dhanbad 1994]
Answer» A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be [ISM Dhanbad 1994]

1741.

A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be[ISM Dhanbad 1994]

Answer»

A glass hemisphere of radius 0.04 m and R.I. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be

[ISM Dhanbad 1994]

Discussion

1742.	In the given circuit, in the steady state condition, the potential drop across the capacitor must be-
Answer» In the given circuit, in the steady state condition, the potential drop across the capacitor must be-

Discussion

1743.	An equilateral triangle prism is made of glass refractive index=1.5 . A ray of light is incident normally on one of the faces . The angle between the incident and emergent ray is
Answer» An equilateral triangle prism is made of glass refractive index=1.5 . A ray of light is incident normally on one of the faces . The angle between the incident and emergent ray is

Discussion

1744.	Which of the following graphs correctly represents uniform angular retardation of a body?
Answer» Which of the following graphs correctly represents uniform angular retardation of a body?

Discussion

1745.	A metal plate of mass 200 gm is balanced in mid–air by throwing 40 balls/sec, each of mass 2 gm, vertically upwards from below. The balls rebound with the same speed with which they strike the plate. Find the velocity with which the balls strike the plate. (Take g=10 m/s2)
Answer» A metal plate of mass $200 g m$ is balanced in mid–air by throwing $40$ balls/sec, each of mass $2 g m$ , vertically upwards from below. The balls rebound with the same speed with which they strike the plate. Find the velocity with which the balls strike the plate. (Take $g = 10 m / s^{2}$ )

Discussion

1746.	Why is Earth a inertial frame of reference?
Answer» Why is Earth a inertial frame of reference?

Discussion

1747.	Find equilibrium S and equilibrium I when: Y = 4,400, MPC = 0.75 and ¯C=100.
Answer» Find equilibrium S and equilibrium I when: Y = 4,400, MPC = 0.75 and $¯ C = 100$ .

Discussion

1748.	A hollow charged conductor has a tiny hole cut into its surface.Show that the electric field in the hole is (s/2e0) ˆn , where ˆn is theunit vector in the outward normal direction, and s is the surfacecharge density near the hole.
Answer» A hollow charged conductor has a tiny hole cut into its surface.Show that the electric field in the hole is (s/2e0) ˆn , where ˆn is theunit vector in the outward normal direction, and s is the surfacecharge density near the hole.

Discussion

1749.	Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from height of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is
Answer» Two bodies $A$ (of mass 1 kg) and $B$ (of mass 3 kg) are dropped from height of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is

Discussion

1750.	DJ ZIT.B6 A projectile can have the same range R for two angles of projection. If ti and t be the times of flights inthe two cases, then the product of the two times of flight is proportional to(A) R1(C)R1(B)(D) R22The kinetic enerov at
Answer» DJ ZIT.B6 A projectile can have the same range R for two angles of projection. If ti and t be the times of flights inthe two cases, then the product of the two times of flight is proportional to(A) R1(C)R1(B)(D) R22The kinetic enerov at

Discussion

Explore topic-wise InterviewSolutions in .

The velocity of a body moving in a straight line at the end of 5 sec is 30m/s,at the end of 12sec is 58m/s and at the end of 22sec,it is 98m/s the body is moving with 1Uniform velocity 2 Uniform acceleration 3 Zero velocity 4 Uniform retardation

13. A wire is bent in the form of a regular pentagon of edge length a. A total of charge q is distributed over it.Find the electric field at the centre of the pentagon

the motion of a charged particle can be used to distinguish between a magnetic field and electric field in a certain region by firing the charge

25.A wheel of inertia 4 kg meter-square about its symmetrical axis, rotates at rate of 240 rpm about it. The torque which can stop the rotation of the wheel in one mintues is

The power developed in an unknown resistance R is same as the power developed in the resistance of 8 ohm when these are connected separately across a battery of internal resistance 4 ohm.The value of R is

In order to raise a mass of 100 kg, a man ofmass 60 kg fastens a rope to it and passesthere rope over a smooth pulley. He climbsthe rope with acceleration 5g/4 relative tothe rope. The tension is the rope is (take10 ms2)TIZELLТАAT

A boy walks to his school at a distance of 6 km with constant speed of2.5 kmhr and walks back with a constant speed of 4 kmhr. His average speed for round trip expressed in kmhr, is

Point source of light of power P is kept above a table at a distance R. If C is the speed of light it and Epsilon Not in the permittivity then amplitude of electric field at distance R is

A wire of fixed length is wound on a solenoid of length ‘ℓ′ and radius ‘r’. Its self inductance is found to be L. Now if same wire is wound on a solenoid of length ℓ2 and r2, then the self inductance will be:

Find the value of d(√x +1/√x) /dx

Identify the incorrect displacement-time curve which does not represent motion in one dimension.

An electric flux of -6 × 10 to the power -3 Nm*m/C passes normally through a spherical Gaussian surface of radius 10 cm, due to a point charge placed at its centre.a) If the radius of the Gaussian surface is doubled, how much flux would pass through the surface

A Hall effect transducer is used for the measurement of a magnetic field of 0.5(Wb/m2). The 2mm thick slab is made of bismuth for which the Hall's co-efficient is −1×10−6(Vm/(A Wbm−2)) the current is 3A, the output voltage (in mV) is _____-0.75

Consider the signal space representation of a 4-ary modulation scheme as shown in the figure below:If the symbols s0,s1,s2 and s3 are occurring with probabilities 0.3,0.2,0.4 and 0.1 respectively, then the average symbols energy of the modulation scheme will be equal to

In deriving the single slit diffraction pattern, it was stated that theintensity is zero at angles of nλ/a. Justify this by suitably dividingthe slit to bring out the cancellation.

Two particles having mass ratio n:1 are interconnected by a light inextensible string that passes over a smooth pulley. If system is released then acceleration of centre of mass of the particle system is?

A mild steel wire of length 1.0 m and cross-sectional area 0.50 × 10¯² cm² is stretched, well within its elastic limit, horizontally between two pillars. A mass of 100 g is suspended from the mid-point of the wire. Calculate the depression at the midpoint.

If intensity of each wave in the observed interference pattern in Young's double slit experiment is I0, then for some point P where the phase difference is ϕ, resultant intensity I will be:

Figure shows a wire ab of length l and resistance R which can slide on a smooth pair of rails in a uniform magnetic field B. Ig is a current generator which supplies a constant current i in the circuit. If the wire ab slides at a speed v towards the right, find the potential difference Va−Vb.

speed v of a particle of mass m moving on a circular path of radius r depends on the distance travelled x as v=kx. The tangential force acting on the particle when it travels a distance x( k is a constant).

A beaker is filled with liquid having surface tension 0.07 N/m. If a bubble of radius 0.5 mm is formed at depth h=1 m below the free surface, then find difference between the pressure acting inside the bubble and free surface.(Density of liquid is 1000 kg /m3)

A closed coil having 50 turns, area 300 cm2, is rotated from a position where its plane makes an angle of 60∘ with a magnetic field of flux density 2.0 T to a position perpendicular to the field in a time of 10 s. What is the average emf induced in the coil?

Find the derivative of a+bsinxc+dcosx where a,b,c,d are fixed non-zero constants.

After the drop detaches, its surface energy is

the magnitude of change in velocity of a particle having speed v is v during a time period

a block of mass 10 kg is placed on a rough inclined plane of coefficient of friction 0.8 of an angle of inclination of 30 what is the friction force

ntShow that the angular momentum about any point of a single particle moving with constant velocity remains constant throughtout the the motion .n

In the given circuit, if point C is connected to the earth and a potential of 2000 V is given to point A. The potential at B is

In a 100 kV, 60 Hz system, the reactance and capacitance up to the location of circuit breaker are 4Ω and 0.02 μF respectively. The maximum value of RRRV will be

A circular ring carries a charge Q . The position (x) of another charge q on the axis of circular ring so that it experiences a maximum force is (R is radius of ring) ?

An object of mass M is divided into two parts ,which are placed at a distance of d .if the gravitational force of attraction is maximum between parts ,then find the ratio of mass of both parts

Q. A concave mirror if focal length 100cm is used to obtain the image of sun which subtends an angle 30'. The diameter of the image of sun. A. 1.74. B. 0.87 C. 0.435 D. 100

A bird moves from point (1m,-2m,3m) to (4m, 2m, 3m).If the speed of the bird is 10m/s then find the velocity vector of the bird in m/s. Also find the vector product of AB if a vector A points vertically upwards and B points towards north .

The mass of the sphere is 3.2×10−14 kg and it carries a net charge equal to that of 10 electrons. If the electronic charge is −1.6×10−19 C and the acceleration of free fall is 10ms−2 the field required to keep the sphere stationary is

Average total energy density for a transverse wave is 16 J/m. The average kinetic energy density for the corresponding wave will be

In the given circuit, in the steady state condition, the potential drop across the capacitor must be-

An equilateral triangle prism is made of glass refractive index=1.5 . A ray of light is incident normally on one of the faces . The angle between the incident and emergent ray is

Which of the following graphs correctly represents uniform angular retardation of a body?

A metal plate of mass 200 gm is balanced in mid–air by throwing 40 balls/sec, each of mass 2 gm, vertically upwards from below. The balls rebound with the same speed with which they strike the plate. Find the velocity with which the balls strike the plate. (Take g=10 m/s2)

Why is Earth a inertial frame of reference?

Find equilibrium S and equilibrium I when: Y = 4,400, MPC = 0.75 and ¯C=100.

A hollow charged conductor has a tiny hole cut into its surface.Show that the electric field in the hole is (s/2e0) ˆn , where ˆn is theunit vector in the outward normal direction, and s is the surfacecharge density near the hole.

Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from height of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is

DJ ZIT.B6 A projectile can have the same range R for two angles of projection. If ti and t be the times of flights inthe two cases, then the product of the two times of flight is proportional to(A) R1(C)R1(B)(D) R22The kinetic enerov at