50278 + Interview Questions in Physics

1.	In a YDSE, first minima for λ1=600 nm coincides with the first maxima for wavelength λ2. Calculate the value of λ2.
Answer» In a YDSE, first minima for $λ_{1} = 600 nm$ coincides with the first maxima for wavelength $λ_{2}$ . Calculate the value of $λ_{2}$ .

Discussion

2.	A point particle of mass m, moves along the uniformly rough track PQR as shown in the figure. The coefficient of friction, between the particle and the rough track equals μ. The particle is released, from rest, from the point P and it comes to rest at a point R. The energies, lost by the ball, over the parts, PQ and QR, of the track, are equal to each other, and no energy is lost when particle changes direction from PQ to QR. The value of the coefficient of friction μ and the distance x(=QR), are, respectively close to:
Answer» A point particle of mass m, moves along the uniformly rough track PQR as shown in the figure. The coefficient of friction, between the particle and the rough track equals $μ$ . The particle is released, from rest, from the point P and it comes to rest at a point R. The energies, lost by the ball, over the parts, PQ and QR, of the track, are equal to each other, and no energy is lost when particle changes direction from PQ to QR. The value of the coefficient of friction $μ$ and the distance x(=QR), are, respectively close to:

2.

A point particle of mass m, moves along the uniformly rough track PQR as shown in the figure. The coefficient of friction, between the particle and the rough track equals μ. The particle is released, from rest, from the point P and it comes to rest at a point R. The energies, lost by the ball, over the parts, PQ and QR, of the track, are equal to each other, and no energy is lost when particle changes direction from PQ to QR. The value of the coefficient of friction μ and the distance x(=QR), are, respectively close to:

Answer»

A point particle of mass m, moves along the uniformly rough track PQR as shown in the figure. The coefficient of friction, between the particle and the rough track equals $μ$ . The particle is released, from rest, from the point P and it comes to rest at a point R. The energies, lost by the ball, over the parts, PQ and QR, of the track, are equal to each other, and no energy is lost when particle changes direction from PQ to QR.

The value of the coefficient of friction $μ$ and the distance x(=QR), are, respectively close to:

Discussion

3.	A rectangular loop PQRS made of a uniform wire ; has a length a , width b and mass m. It is free to rotate about arm PQ which remains hinged along a horizontal line taken as Y-axis. Taking the +ve Z-axis as vertically upward direction. A uniform magnetic field B=(3^i+4^k)B0 exists in the region. The loop is held in XY-plane and a current I is passed through it. The loop is now released and found to stay in the horizontal position in equilibrium.(B0 is a constant)
Answer» A rectangular loop $PQRS$ made of a uniform wire ; has a length $a$ , width $b$ and mass $m$ . It is free to rotate about arm $PQ$ which remains hinged along a horizontal line taken as $Y-axis$ . Taking the $+ v e$ $Z-axis$ as vertically upward direction. A uniform magnetic field $B = (3^i + 4^k) B_{0}$ exists in the region. The loop is held in $XY-plane$ and a current $I$ is passed through it. The loop is now released and found to stay in the horizontal position in equilibrium. ( $B_{0}$ is a constant)

Discussion

4.	A composite conductor consists of 4 conductors of radius 2 cm each. The conductors are arranged as shown below. The geometric mean radius GMR (in cm) for the given arrangement is________.22.9
Answer» A composite conductor consists of 4 conductors of radius 2 cm each. The conductors are arranged as shown below. The geometric mean radius GMR (in cm) for the given arrangement is________. 22.9

Discussion

5.	In the figure given the position-time graph of a particle of mass 0.1 kg is shown. The impulse at t=2 s is :
Answer» In the figure given the position-time graph of a particle of mass $0.1 kg$ is shown. The impulse at $t = 2 s$ is :

Discussion

6.	A ring of radius R is rolling purely on the outer surface of a fixed pipe of radius 4R. At some instant, the centre of the ring has a constant speed = v as shown in fig.
Answer» A ring of radius R is rolling purely on the outer surface of a fixed pipe of radius 4R. At some instant, the centre of the ring has a constant speed = v as shown in fig.

6.

A ring of radius R is rolling purely on the outer surface of a fixed pipe of radius 4R. At some instant, the centre of the ring has a constant speed = v as shown in fig.

Answer»

A ring of radius R is rolling purely on the outer surface of a fixed pipe of radius 4R. At some instant, the centre of the ring has a constant speed = v as shown in fig.

Discussion

7.	A metal sphere A of radius a is charged to potential V. What will be the its potential if it is enclosed by a spherical conducting shell B of radius b and the two are connected by metalic wire.
Answer» A metal sphere $A$ of radius $a$ is charged to potential $V$ . What will be the its potential if it is enclosed by a spherical conducting shell $B$ of radius $b$ and the two are connected by metalic wire.

Discussion

8.	The plane surface of a plano- convex lens is silvered. If μ be the refractive index and R, the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature of
Answer» The plane surface of a plano- convex lens is silvered. If $μ$ be the refractive index and $R$ , the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature of

Discussion

9.	Consider the circuit shown in the figure below.The above silicon transistor is biased at operating point Q(7V, 1 mA) and with Vcc=12V. If the value of β=100, then the value of stability factor S(Ico) is _________ 56.75
Answer» Consider the circuit shown in the figure below. The above silicon transistor is biased at operating point Q(7V, 1 mA) and with $V_{c c} = 12 V .$ If the value of $β = 100$ , then the value of stability factor $S (I_{c o})$ is _________ 56.75

Discussion

10.	Figure shows the position-time (x−t) graph of one dimensional motion of a body of mass 500 g. What is the time interval between two-consecutive impulses received by the body?
Answer» Figure shows the position-time $(x - t)$ graph of one dimensional motion of a body of mass $500 g$ . What is the time interval between two-consecutive impulses received by the body?

Discussion

11.	A ball falls on an inclined plane of inclination θ from aheight h above the point of impact and makes a perfectlyelastic collision. Where will it hit the plane again ?
Answer» A ball falls on an inclined plane of inclination θ from aheight h above the point of impact and makes a perfectlyelastic collision. Where will it hit the plane again ?

Discussion

12.	Question 28Compare the power at which each of the following is moving upwards against the force of gravity?(i) A butterfly of mass 1.0 g that flies upward at a rate of 0.5 ms−1(ii) A 250 g squirrel climbing up on a tree at a rate of 0.5 ms−1
Answer» Question 28 Compare the power at which each of the following is moving upwards against the force of gravity? (i) A butterfly of mass 1.0 g that flies upward at a rate of $0.5 m s^{- 1}$ (ii) A 250 g squirrel climbing up on a tree at a rate of $0.5 m s^{- 1}$

Discussion

13.	Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 m/s2 in the upward direction in both the blocks. If T and T′ be the tensions in the two parts of the string, then
Answer» Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 $m / s^{2}$ in the upward direction in both the blocks. If T and T′ be the tensions in the two parts of the string, then

13.

Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 m/s2 in the upward direction in both the blocks. If T and T′ be the tensions in the two parts of the string, then

Answer»

Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 $m / s^{2}$ in the upward direction in both the blocks. If T and T′ be the tensions in the two parts of the string, then

Discussion

14.	A ball projected from the ground vertically upward is at same time t1 and t2. The speed of projection of ball is?
Answer» A ball projected from the ground vertically upward is at same time t1 and t2. The speed of projection of ball is?

Discussion

15.	an alpha particle is moving on a circular orbit with speed V the equivalent current in the orbit is I if radius is increaesd to 3 times then speed is reduced by half times the the equivalent current in the orbit is (a)I/3 (b)I/2 (C)I/6 (d)2I/3
Answer» an alpha particle is moving on a circular orbit with speed V the equivalent current in the orbit is I if radius is increaesd to 3 times then speed is reduced by half times the the equivalent current in the orbit is (a)I/3 (b)I/2 (C)I/6 (d)2I/3

Discussion

16.	A deflection magnetometer is placed with its arms in north-south direction. How and where should a short magnet having MBH=40Am2T−1 be placed so that the needle can stay in any position ?
Answer» A deflection magnetometer is placed with its arms in north-south direction. How and where should a short magnet having $\frac{M}{B_{H}} = 40 A m^{2} T^{- 1}$ be placed so that the needle can stay in any position ?

Discussion

17.	74.A circular ring of radius R with uniform positive charge Q is located in the y-z plane with its centre at the origin O . What should be the work done by the field to move a charge +q from (0,0,0) to (R3,0,0)
Answer» 74.A circular ring of radius R with uniform positive charge Q is located in the y-z plane with its centre at the origin O . What should be the work done by the field to move a charge +q from (0,0,0) to (R3,0,0)

Discussion

18.	In a practical meter bridge circuit as shown, when one more resistance of 50 Ω is connected parallel with unknown resistance ′x′, then ratio l1l2 becomes ′2′. The value of x is (l1 is balance length, AB is uniform wire)
Answer» In a practical meter bridge circuit as shown, when one more resistance of $50 Ω$ is connected parallel with unknown resistance $^{'} x^{'}$ , then ratio $\frac{l_{1}}{l_{2}}$ becomes $^{'} 2^{'}$ . The value of x is $(l_{1}$ is balance length, AB is uniform wire)

Discussion

19.	For givenvectors, and,find the unit vector in the direction of the vector
Answer» For given vectors, and , find the unit vector in the direction of the vector

Discussion

20.	A particle is projected with speed of 25m/s vertically upward. The dis†an ce travelled by ball in 3rd second of its journey is (1) Zero (2) 2.25 m (3) 2.5 m (4) 1.25 m
Answer» A particle is projected with speed of 25m/s vertically upward. The dis†an ce travelled by ball in 3rd second of its journey is (1) Zero (2) 2.25 m (3) 2.5 m (4) 1.25 m

Discussion

21.	64. A uniform disc of radius R is put over another uniform disc of radius 2 R made of same material having same thickness the PeriPheries of the two discs touches Each Other. locate the centre of mass of the system taking centre of large disc at origin.
Answer» 64. A uniform disc of radius R is put over another uniform disc of radius 2 R made of same material having same thickness the PeriPheries of the two discs touches Each Other. locate the centre of mass of the system taking centre of large disc at origin.

Discussion

22.	Two T-flip flops are connected as a synchronous counter that goes through the following QBQA sequence
Answer» Two T-flip flops are connected as a synchronous counter that goes through the following $Q_{B} Q_{A}$ sequence

Discussion

23.	A transistor is connected in common emitter circuit configuration, the collector supply voltage is 10 V and the voltage drop across a resistor of 1000 Ω in the collector circuit is 0.6 V. If the current gain factor (β) is 24, then the base current is _____ μA.(Round off to the Nearest Integer)
Answer» A transistor is connected in common emitter circuit configuration, the collector supply voltage is $10 V$ and the voltage drop across a resistor of $1000 Ω$ in the collector circuit is $0.6 V$ . If the current gain factor $(β)$ is $24$ , then the base current is _____ $μ A$ . (Round off to the Nearest Integer)

Discussion

24.	The wavelength of a certain line in the x-ray spectrum for tungsten (Z = 74) is 200∘A. What would be the wavelength of the same line for platinum (Z = 78)? The screening constant a is unity.
Answer» The wavelength of a certain line in the x-ray spectrum for tungsten (Z = 74) is $200 \circ A .$ What would be the wavelength of the same line for platinum (Z = 78)? The screening constant a is unity.

Discussion

25.	Ablock of mass 25 kg is raised by a 50 kg man in two different ways asshown in Fig. 5.19. What is the action on the floor by the man in thetwo cases? If the floor yields to a normal force of 700 N, which modeshould the man adopt to lift the block without the floor yielding?
Answer» A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

25.

Ablock of mass 25 kg is raised by a 50 kg man in two different ways asshown in Fig. 5.19. What is the action on the floor by the man in thetwo cases? If the floor yields to a normal force of 700 N, which modeshould the man adopt to lift the block without the floor yielding?

Answer»

A
block of mass 25 kg is raised by a 50 kg man in two different ways as
shown in Fig. 5.19. What is the action on the floor by the man in the
two cases? If the floor yields to a normal force of 700 N, which mode
should the man adopt to lift the block without the floor yielding?

Discussion

26.	Consider a thin spherical shell of radius R with its centre at the origin, carrying uniform positive surface charge density. The variation of the manitude of the electric field \|E(r)\| and the electric potential V(r) with the distance r from the centre, is best represented by which graph?
Answer» Consider a thin spherical shell of radius $R$ with its centre at the origin, carrying uniform positive surface charge density. The variation of the manitude of the electric field $\| E (r) \|$ and the electric potential $V (r)$ with the distance $r$ from the centre, is best represented by which graph?

Discussion

27.	Two particles of masses in the ratio 1:2 with charges in the ratio 1:1 are placed in uniform electric field E and allowed to move for the same time. the ratio of their Kinetic energies will be
Answer» Two particles of masses in the ratio 1:2 with charges in the ratio 1:1 are placed in uniform electric field E and allowed to move for the same time. the ratio of their Kinetic energies will be

Discussion

28.	The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom. If the coefficient of friction between the block and lower half of plane is given by
Answer» The upper half of an inclined plane of inclination $θ$ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom. If the coefficient of friction between the block and lower half of plane is given by

Discussion

29.	For a plane mirror oriented as shown in the figure, the relation between object distance (u) and image distance (v) from the mirror, can be best represented by which graph?
Answer» For a plane mirror oriented as shown in the figure, the relation between object distance $(u)$ and image distance $(v)$ from the mirror, can be best represented by which graph?

Discussion

30.	A wire is bent into a semicircular arc of radius R. The rod has a uniform linear charge distribution x. The potential at the centre is?
Answer» A wire is bent into a semicircular arc of radius R. The rod has a uniform linear charge distribution x. The potential at the centre is?

Discussion

31.	Which among the following is the condition for electromagnetic induction to take place?
Answer» Which among the following is the condition for electromagnetic induction to take place?

Discussion

32.	particle moving with uniform acceleration alongX-axis crosses the points x = 2 m and x = 7 m withvelocities 5 ms-1 and 15 ms-1 respectively. Thevelocity with which it crosses point x = 3 m is(1) 65 ms(2) 10 ms-1(3)50 ms(4) 35 ms1
Answer» particle moving with uniform acceleration alongX-axis crosses the points x = 2 m and x = 7 m withvelocities 5 ms-1 and 15 ms-1 respectively. Thevelocity with which it crosses point x = 3 m is(1) 65 ms(2) 10 ms-1(3)50 ms(4) 35 ms1

Discussion

33.	A frictionless track ABCDE ends in a circular loop of radius R. A body slides down the track from point A which is at a height h=9 cm. Maximum value of R for a body to complete the loop successfully is
Answer» A frictionless track $ABCDE$ ends in a circular loop of radius $R$ . A body slides down the track from point $A$ which is at a height $h = 9 cm$ . Maximum value of $R$ for a body to complete the loop successfully is

Discussion

34.	Find the number of imges formed according to the given cases
Answer» Find the number of imges formed according to the given cases

Discussion

35.	Consider a 20 kg uniform circular disk of radius 0.2 m. It is pin supported at its center and is at rest initially. The disk is acted upon by a constant force F=20N through a massless string wrapped around its periphery as shown in the figure.Suppose the disk makes n number of revolutions to attain an angular speed of 50 rad s−1. The value of n, to the nearest integer is . [Given: In one complete revolution, the disk rotates by 6.28 rad]
Answer» Consider a $20 kg$ uniform circular disk of radius $0.2 m$ . It is pin supported at its center and is at rest initially. The disk is acted upon by a constant force $F = 20 N$ through a massless string wrapped around its periphery as shown in the figure. Suppose the disk makes $n$ number of revolutions to attain an angular speed of $50 {rad s}^{- 1}$ . The value of n, to the nearest integer is . [Given: In one complete revolution, the disk rotates by 6.28 rad]

Discussion

36.	28.a parallel plate capacitor of plate area A and plate separation d is charged to a potential V are disconnected.A slab of dielectric constant K is the inserted between the plates.The work done on the system during the process of inserting the slab
Answer» 28.a parallel plate capacitor of plate area A and plate separation d is charged to a potential V are disconnected.A slab of dielectric constant K is the inserted between the plates.The work done on the system during the process of inserting the slab

Discussion

37.	Two cylinders of same cross-section and length L but made of two materials of densities d1 and d2 are connected together to a form a cylinder of length 2L. The combination floats in a liquid of density d with a length L2 above the surface of the liquid. If d1<d2, then
Answer» Two cylinders of same cross-section and length $L$ but made of two materials of densities $d_{1}$ and $d_{2}$ are connected together to a form a cylinder of length $2 L$ . The combination floats in a liquid of density $d$ with a length $\frac{L}{2}$ above the surface of the liquid. If $d_{1} < d_{2}$ , then

Discussion

38.	An object is displaced from point A(2,0,0) m to a point B(1,0,4) m under the influence of a force →F=4x^i−2z^k. The workdone by this force is
Answer» An object is displaced from point $A (2, 0, 0) m$ to a point $B (1, 0, 4) m$ under the influence of a force $\to F = 4 x^i - 2 z^k .$ The workdone by this force is

Discussion

39.	For a given quadratic expression 2x2+5x−9=0, find the product of the roots.
Answer» For a given quadratic expression $2 x^{2} + 5 x - 9 = 0$ , find the product of the roots.

Discussion

40.	Two infinite sheets having equal charge densities σ are placed in two perpendicular planes whose two-dimensional view is shown in the figure. The charges are distributed uniformly on sheets in electrostatic equilibrium condition. E1 and E2 are electric field at point P due to the sheets 1 and 2 respectively and E is the net electric field. The angle θ is
Answer» Two infinite sheets having equal charge densities $σ$ are placed in two perpendicular planes whose two-dimensional view is shown in the figure. The charges are distributed uniformly on sheets in electrostatic equilibrium condition. $E_{1}$ and $E_{2}$ are electric field at point $P$ due to the sheets $1$ and $2$ respectively and $E$ is the net electric field. The angle $θ$ is

Discussion

41.	Ram goes from A to B by auto at the speed of 20km/hrs and comes back from B to A in a cab at the speed of 80km/hrs. Find his average speed ?
Answer» Ram goes from A to B by auto at the speed of 20km/hrs and comes back from B to A in a cab at the speed of 80km/hrs. Find his average speed ?

Discussion

42.	An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to
Answer» An arc lamp requires a direct current of $10 A$ at $80 V$ to function. If it is connected to a $220 V$ (rms), $50 H z$ AC supply, the series inductor needed for it to work is close to

Discussion

43.	The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to the magnitude of the energy transferred as heat Q between the gas and its environment, greatest first
Answer» The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to the magnitude of the energy transferred as heat Q between the gas and its environment, greatest first

43.

The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to the magnitude of the energy transferred as heat Q between the gas and its environment, greatest first

Answer»

The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to the magnitude of the energy transferred as heat Q between the gas and its environment, greatest first

Discussion

44.	A semicircular portion of radius r=10 cm is cut from a uniform rectangular plate as shown in the figure. The distance of center of mass C of the remaining plate, from point O is (COM of semicircle is at distance 4r3π from the base)
Answer» A semicircular portion of radius $r = 10 cm$ is cut from a uniform rectangular plate as shown in the figure. The distance of center of mass $C$ of the remaining plate, from point $O$ is (COM of semicircle is at distance $\frac{4 r}{3 π}$ from the base)

Discussion

45.	If sin−1(sinp)=3π−p and the point of intersection of the lines x+y=6 and px−y=3 has integral coordinates, then the sum of value(s) of p is
Answer» If ${sin}^{- 1} (sin p) = 3 π - p$ and the point of intersection of the lines $x + y = 6$ and $p x - y = 3$ has integral coordinates, then the sum of value(s) of $p$ is

Discussion

46.	The dimensions of 1/μ0ε0. where symbols have their usual meanings, are
Answer» The dimensions of $1 / μ_{0} ε_{0}$ . where symbols have their usual meanings, are

Discussion

47.	The parity check matrix of a(7,4) linear block codes is given by,If the code word received at the output of the channel is [1110100]. If there is a possibility for at most one−bit error due to channel noise, then the correct code wordtransmitted at the input of the channel will be.H=⎡⎢⎣111010010110101111001⎤⎥⎦
Answer» $T h e p a r i t y c h e c k m a t r i x o f a (7, 4) l i n e a r b l o c k c o d e s i s g i v e n b y, I f t h e c o d e w o r d r e c e i v e d a t t h e o u t p u t o f t h e c h a n n e l i s [1110100] . I f t h e r e i s a p o s s i b i l i t y f o r a t m o s t o n e - b i t e r r o r d u e t o c h a n n e l n o i s e, t h e n t h e c o r r e c t c o d e w o r d t r a n s m i t t e d a t t h e i n p u t o f t h e c h a n n e l w i l l b e . H = ⎡ ⎢ ⎣ \begin{matrix} 1 & 1 & 1 & 0 & 1 & 0 & 0 1 & 0 & 1 & 1 & 0 & 1 & 0 1 & 1 & 1 & 1 & 0 & 0 & 1 \end{matrix} ⎤ ⎥ ⎦$

Discussion

48.	A particle of mass m moves with constant speed along a circular path of radius r under the action of a force F. Its speed is:
Answer» A particle of mass m moves with constant speed along a circular path of radius r under the action of a force F. Its speed is:

Discussion

49.	11. Two planets have same density but different radii. The acceleration due to gravity would be 1 same on both planets 2 greater on the smaller planet 3 greater on the larger planet 4 dependent on the distance of planet from the sun
Answer» 11. Two planets have same density but different radii. The acceleration due to gravity would be 1 same on both planets 2 greater on the smaller planet 3 greater on the larger planet 4 dependent on the distance of planet from the sun

Discussion

50.	The position of two point masses are shown in the figureThe position of centre of mass is
Answer» The position of two point masses are shown in the figure The position of centre of mass is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In a YDSE, first minima for λ1=600 nm coincides with the first maxima for wavelength λ2. Calculate the value of λ2.

A composite conductor consists of 4 conductors of radius 2 cm each. The conductors are arranged as shown below. The geometric mean radius GMR (in cm) for the given arrangement is________.22.9

In the figure given the position-time graph of a particle of mass 0.1 kg is shown. The impulse at t=2 s is :

A ring of radius R is rolling purely on the outer surface of a fixed pipe of radius 4R. At some instant, the centre of the ring has a constant speed = v as shown in fig.

A metal sphere A of radius a is charged to potential V. What will be the its potential if it is enclosed by a spherical conducting shell B of radius b and the two are connected by metalic wire.

The plane surface of a plano- convex lens is silvered. If μ be the refractive index and R, the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature of

Consider the circuit shown in the figure below.The above silicon transistor is biased at operating point Q(7V, 1 mA) and with Vcc=12V. If the value of β=100, then the value of stability factor S(Ico) is _________ 56.75

Figure shows the position-time (x−t) graph of one dimensional motion of a body of mass 500 g. What is the time interval between two-consecutive impulses received by the body?

A ball falls on an inclined plane of inclination θ from aheight h above the point of impact and makes a perfectlyelastic collision. Where will it hit the plane again ?

Question 28Compare the power at which each of the following is moving upwards against the force of gravity?(i) A butterfly of mass 1.0 g that flies upward at a rate of 0.5 ms−1(ii) A 250 g squirrel climbing up on a tree at a rate of 0.5 ms−1

Two blocks are connected by a string as shown in the diagram. The upper block is hung by another string. A force F applied on the upper string produces an acceleration of 2 m/s2 in the upward direction in both the blocks. If T and T′ be the tensions in the two parts of the string, then

A ball projected from the ground vertically upward is at same time t1 and t2. The speed of projection of ball is?

an alpha particle is moving on a circular orbit with speed V the equivalent current in the orbit is I if radius is increaesd to 3 times then speed is reduced by half times the the equivalent current in the orbit is (a)I/3 (b)I/2 (C)I/6 (d)2I/3

A deflection magnetometer is placed with its arms in north-south direction. How and where should a short magnet having MBH=40Am2T−1 be placed so that the needle can stay in any position ?

74.A circular ring of radius R with uniform positive charge Q is located in the y-z plane with its centre at the origin O . What should be the work done by the field to move a charge +q from (0,0,0) to (R3,0,0)

In a practical meter bridge circuit as shown, when one more resistance of 50 Ω is connected parallel with unknown resistance ′x′, then ratio l1l2 becomes ′2′. The value of x is (l1 is balance length, AB is uniform wire)

For givenvectors, and,find the unit vector in the direction of the vector

A particle is projected with speed of 25m/s vertically upward. The dis†an ce travelled by ball in 3rd second of its journey is (1) Zero (2) 2.25 m (3) 2.5 m (4) 1.25 m

64. A uniform disc of radius R is put over another uniform disc of radius 2 R made of same material having same thickness the PeriPheries of the two discs touches Each Other. locate the centre of mass of the system taking centre of large disc at origin.

Two T-flip flops are connected as a synchronous counter that goes through the following QBQA sequence

A transistor is connected in common emitter circuit configuration, the collector supply voltage is 10 V and the voltage drop across a resistor of 1000 Ω in the collector circuit is 0.6 V. If the current gain factor (β) is 24, then the base current is _____ μA.(Round off to the Nearest Integer)

The wavelength of a certain line in the x-ray spectrum for tungsten (Z = 74) is 200∘A. What would be the wavelength of the same line for platinum (Z = 78)? The screening constant a is unity.

Ablock of mass 25 kg is raised by a 50 kg man in two different ways asshown in Fig. 5.19. What is the action on the floor by the man in thetwo cases? If the floor yields to a normal force of 700 N, which modeshould the man adopt to lift the block without the floor yielding?

Consider a thin spherical shell of radius R with its centre at the origin, carrying uniform positive surface charge density. The variation of the manitude of the electric field |E(r)| and the electric potential V(r) with the distance r from the centre, is best represented by which graph?

Two particles of masses in the ratio 1:2 with charges in the ratio 1:1 are placed in uniform electric field E and allowed to move for the same time. the ratio of their Kinetic energies will be

The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom. If the coefficient of friction between the block and lower half of plane is given by

For a plane mirror oriented as shown in the figure, the relation between object distance (u) and image distance (v) from the mirror, can be best represented by which graph?

A wire is bent into a semicircular arc of radius R. The rod has a uniform linear charge distribution x. The potential at the centre is?

Which among the following is the condition for electromagnetic induction to take place?

particle moving with uniform acceleration alongX-axis crosses the points x = 2 m and x = 7 m withvelocities 5 ms-1 and 15 ms-1 respectively. Thevelocity with which it crosses point x = 3 m is(1) 65 ms(2) 10 ms-1(3)50 ms(4) 35 ms1

A frictionless track ABCDE ends in a circular loop of radius R. A body slides down the track from point A which is at a height h=9 cm. Maximum value of R for a body to complete the loop successfully is

Find the number of imges formed according to the given cases

28.a parallel plate capacitor of plate area A and plate separation d is charged to a potential V are disconnected.A slab of dielectric constant K is the inserted between the plates.The work done on the system during the process of inserting the slab

Two cylinders of same cross-section and length L but made of two materials of densities d1 and d2 are connected together to a form a cylinder of length 2L. The combination floats in a liquid of density d with a length L2 above the surface of the liquid. If d1&lt;d2, then

An object is displaced from point A(2,0,0) m to a point B(1,0,4) m under the influence of a force →F=4x^i−2z^k. The workdone by this force is

For a given quadratic expression 2x2+5x−9=0, find the product of the roots.

Ram goes from A to B by auto at the speed of 20km/hrs and comes back from B to A in a cab at the speed of 80km/hrs. Find his average speed ?

An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to

The figure here shows four paths on a p-V diagrams along which as gas can be taken from state i to state f. Rank the paths according to the magnitude of the energy transferred as heat Q between the gas and its environment, greatest first

A semicircular portion of radius r=10 cm is cut from a uniform rectangular plate as shown in the figure. The distance of center of mass C of the remaining plate, from point O is (COM of semicircle is at distance 4r3π from the base)

If sin−1(sinp)=3π−p and the point of intersection of the lines x+y=6 and px−y=3 has integral coordinates, then the sum of value(s) of p is

The dimensions of 1/μ0ε0. where symbols have their usual meanings, are

A particle of mass m moves with constant speed along a circular path of radius r under the action of a force F. Its speed is:

11. Two planets have same density but different radii. The acceleration due to gravity would be 1 same on both planets 2 greater on the smaller planet 3 greater on the larger planet 4 dependent on the distance of planet from the sun

The position of two point masses are shown in the figureThe position of centre of mass is

Two cylinders of same cross-section and length L but made of two materials of densities d1 and d2 are connected together to a form a cylinder of length 2L. The combination floats in a liquid of density d with a length L2 above the surface of the liquid. If d1<d2, then