50278 + Interview Questions in Physics

1.	The trajectory of a projectile is given by the equation y=x−x2. What is the value of the initial velocity and the angle of projection?
Answer» The trajectory of a projectile is given by the equation $y = x - x^{2}$ . What is the value of the initial velocity and the angle of projection?

Discussion

2.	A drunkard walking in a narrowlane takes 5steps forward and 3 steps backward eachstep of 1 m long, per second and so on.Determine how long the drunkard takes tofall in a pit 15 m away from the start.
Answer» A drunkard walking in a narrowlane takes 5steps forward and 3 steps backward eachstep of 1 m long, per second and so on.Determine how long the drunkard takes tofall in a pit 15 m away from the start.

Discussion

3.	What should be the approximate height of antenna if the TV telecast is to cover a radius of 100 km?
Answer» What should be the approximate height of antenna if the TV telecast is to cover a radius of 100 km?

Discussion

4.	Current i is flowing in a conducting wire as shown in the figure. The radius of circular part is R and the length of straight portion is very large. The value of magnetic field at the centre O isएक चालक तार में धारा i चित्रानुसार प्रवाहित हो रही है। वृत्तीय भाग की त्रिज्या R है तथा सीधे भाग की लम्बाई अत्यधिक है। केन्द्र O पर चुम्बकीय क्षेत्र का मान है
Answer» Current i is flowing in a conducting wire as shown in the figure. The radius of circular part is R and the length of straight portion is very large. The value of magnetic field at the centre O is एक चालक तार में धारा i चित्रानुसार प्रवाहित हो रही है। वृत्तीय भाग की त्रिज्या R है तथा सीधे भाग की लम्बाई अत्यधिक है। केन्द्र O पर चुम्बकीय क्षेत्र का मान है

Discussion

5.	A block of mass 'm' is suspended by different springs of spring constants shown in the figure. Let time period of oscillation in these four positions be T1, T2, T3 and T4. Then
Answer» A block of mass 'm' is suspended by different springs of spring constants shown in the figure. Let time period of oscillation in these four positions be T_1,T₂, T₃ and T₄. Then

5.

A block of mass 'm' is suspended by different springs of spring constants shown in the figure. Let time period of oscillation in these four positions be T1, T2, T3 and T4. Then

Answer»

A block of mass 'm' is suspended by different springs of spring constants shown in the figure.

Let time period of oscillation in these four positions be T_1,T₂, T₃ and T₄. Then

Discussion

6.	what is the exact value of molar volume? Is it 22.4 or 22.7.
Answer» what is the exact value of molar volume? Is it 22.4 or 22.7.

Discussion

7.	Calculate the potential difference between points A and B in an electric field →E=(2^i+3^j+4^k) NC−1, where the position vectors of points A and B are →rA=(^i−2^j+^k) m and →rB=(2^i+^j−2^k) m respectively.
Answer» Calculate the potential difference between points $A$ and $B$ in an electric field $\to E = (2^i + 3^j + 4^k) {NC}^{- 1}$ , where the position vectors of points $A$ and $B$ are ${\to r}_{A} = (^i - 2^j +^k) m$ and ${\to r}_{B} = (2^i +^j - 2^k) m$ respectively.

Discussion

8.	One mole of an ideal gas undergoes a process, whose process equation is given as P=P01+(V0V)2 Here P0 and V0 are constants. When the volume of the gas is changed from V0 to 3V0, find the change in the temperature of the gas.
Answer» One mole of an ideal gas undergoes a process, whose process equation is given as $P = \frac{P_{0}}{1 + {(\frac{V_{0}}{V})}^{2}}$ Here $P_{0}$ and $V_{0}$ are constants. When the volume of the gas is changed from $V_{0}$ to $3 V_{0},$ find the change in the temperature of the gas.

Discussion

9.	In the diagram shown, Q iaf=80 cal and W iaf=50 cal. If W=−30 cal for the curved path along fi, value of Q for path fi, will be
Answer» In the diagram shown, $Q_{i a f} = 80 cal$ and $W_{i a f} = 50 cal$ . If $W = - 30 cal$ for the curved path along $f i$ , value of $Q$ for path $f i$ , will be

Discussion

10.	A paramagnetic material has 1028atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8×10−4. Its susceptibility at 300 K is:
Answer» A paramagnetic material has $10^{28} {atoms/m}^{3}$ . Its magnetic susceptibility at temperature $350 K$ is $2.8 \times 10^{- 4}$ . Its susceptibility at $300 K$ is:

Discussion

11.	A granite rod of 60 cm length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is 2.7×103 kg/m3 and its Young's modulus is 9.27×1010 Pa. What will be the fundamental frequency of the longitudinal vibrations?
Answer» A granite rod of $60 cm$ length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is $2.7 \times 10^{3} {kg/m}^{3}$ and its Young's modulus is $9.27 \times 10^{10} Pa$ . What will be the fundamental frequency of the longitudinal vibrations?

Discussion

12.	Rain is falling vertically with a speed of 12ms−1.A cyclist is moving east to west with a speed of 12√3ms−1.In order to protect himself from rain at what angle he should hold his umbrella w.r.t vertical.
Answer» Rain is falling vertically with a speed of $12 m s^{- 1}$ .A cyclist is moving east to west with a speed of $12 \sqrt{3} m s^{- 1}$ .In order to protect himself from rain at what angle he should hold his umbrella w.r.t vertical.

12.

Rain is falling vertically with a speed of 12ms−1.A cyclist is moving east to west with a speed of 12√3ms−1.In order to protect himself from rain at what angle he should hold his umbrella w.r.t vertical.

Answer»

Rain is falling vertically with a speed of $12 m s^{- 1}$ .A cyclist is moving east to west with a speed of

$12 \sqrt{3} m s^{- 1}$ .In order to protect himself from rain at what angle he should hold his umbrella w.r.t

vertical.

Discussion

13.	A system absorb 20KJ heat and does 10KJ work then internal energy of system will be(1) decreases by 10 kJ(2) increases by 10 KJ(3) decreases by 30 KJ(4) increases by 30 KJ
Answer» A system absorb 20KJ heat and does 10KJ work then internal energy of system will be (1) decreases by 10 kJ (2) increases by 10 KJ (3) decreases by 30 KJ (4) increases by 30 KJ

Discussion

14.	a charge q is placed just above the centre of horizontal circle of radius r and hemisphere of the radius is erected about the change compute the electric flux through the closed surface that consist of the hemisphere and the planar circ;e [do not use gauss law]
Answer» a charge q is placed just above the centre of horizontal circle of radius r and hemisphere of the radius is erected about the change compute the electric flux through the closed surface that consist of the hemisphere and the planar circ;e [do not use gauss law]

Discussion

15.	A uniform electric field E is parallel to the axis of a hollow hemisphere of radius r. The electric flux through the hemispherical surface is
Answer» A uniform electric field $E$ is parallel to the axis of a hollow hemisphere of radius $r$ . The electric flux through the hemispherical surface is

Discussion

16.	Solve the differential equation sin(x+y)dy/dx = 5
Answer» Solve the differential equation sin(x+y)dy/dx = 5

Discussion

17.	A boat moves relative to water with a velocity v and river is flowing with 2v. At what angle will the boat move with the stream to have minimum drift ?
Answer» A boat moves relative to water with a velocity $v$ and river is flowing with $2 v$ . At what angle will the boat move with the stream to have minimum drift ?

Discussion

18.	An uncharged capacitor of capacitance 5 μF is connected to a battery of EMF 50 V at t=0 through a resistance of 2 MΩ, then the time at which rate of energy stored is maximum is -
Answer» An uncharged capacitor of capacitance $5 μ F$ is connected to a battery of EMF $50 V$ at $t = 0$ through a resistance of $2 M Ω$ , then the time at which rate of energy stored is maximum is -

Discussion

19.	A particle of mass 10−2 kg is moving along the positive x-axis under the influence of a force, F(x)=−k2x2, where k=10−2Nm2. At time t=0, it is at x=1.0 m and its velocity v=0. The speed of the particle when it reaches x=05 m is
Answer» A particle of mass $10^{- 2} k g$ is moving along the positive x-axis under the influence of a force, $F (x) = \frac{- k}{2 x^{2}}$ , where $k = 10^{- 2} N m^{2}$ . At time $t = 0$ , it is at $x = 1.0 m$ and its velocity $v = 0$ . The speed of the particle when it reaches $x = 05 m$ is

Discussion

20.	In a situation shown below, if the length of seconds hand is 30π cm, find the magnitude of change in velocity of the tip of the seconds hand.
Answer» In a situation shown below, if the length of seconds hand is $\frac{30}{π} cm$ , find the magnitude of change in velocity of the tip of the seconds hand.

Discussion

21.	A space vehicle is traveling at 4300Kmph relative to earth when the exhausted motor (mass 4m) is disengaged and sent back ward with a velocity 82Kmph relative to the command module (mass m) . What is the speed of the command module relative to earth just after separation
Answer» A space vehicle is traveling at 4300Kmph relative to earth when the exhausted motor (mass 4m) is disengaged and sent back ward with a velocity 82Kmph relative to the command module (mass m) . What is the speed of the command module relative to earth just after separation

Discussion

22.	Draw a labeled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?
Answer» Draw a labeled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

Discussion

23.	Two cars A and B are at rest and at the same point initially. If A starts with uniform velocity of 40 m/s and B starts in the same direction with constant acceleration of 4 m/s2 , then B will catch A after the time
Answer» Two cars $A$ and $B$ are at rest and at the same point initially. If $A$ starts with uniform velocity of $40 m/s$ and $B$ starts in the same direction with constant acceleration of $4 {m/s}^{2}$ , then $B$ will catch $A$ after the time

Discussion

24.	A smooth two dimensional flat plate is exposed to a wind velocity of 80kmph. Laminar boundary layer exists upto Reynolds no.of flow equal to 3×105. The kinematic viscosity of wind is 1.5×10−5m2/sec. The maximum thickness of laminar boundary layer (in mm) is ___.1.75
Answer» A smooth two dimensional flat plate is exposed to a wind velocity of $80 k m p h$ . Laminar boundary layer exists upto Reynolds no.of flow equal to $3 \times 10^{5}$ . The kinematic viscosity of wind is $1.5 \times 10^{- 5} m^{2} / s e c$ . The maximum thickness of laminar boundary layer (in mm) is ___. 1.75

Discussion

25.	13. which of the following postulates of kinetic theory of gases is responsible for deviation from ideal behaviour ? a] kinetic energy of the gas molecules increase in temparature b]collisions among the gas molecules are perfectly elastic c]there is no forces of attraction or repulsion among gas molecules d]molecules in a gas follows zig-zag path
Answer» 13. which of the following postulates of kinetic theory of gases is responsible for deviation from ideal behaviour ? a] kinetic energy of the gas molecules increase in temparature b]collisions among the gas molecules are perfectly elastic c]there is no forces of attraction or repulsion among gas molecules d]molecules in a gas follows zig-zag path

Discussion

26.	5.An open organ pipe has a fundamental frequency 300 hertz. The frequency of first overtone of this pipe is the same as the first overtone of the closed organ pipe, the length of the closed organ pipe is? (Velocity of the sound is equals to 330 metre per second) 1)41 cm 2) 75 cm 3)390 cm 4)482 cm
Answer» 5.An open organ pipe has a fundamental frequency 300 hertz. The frequency of first overtone of this pipe is the same as the first overtone of the closed organ pipe, the length of the closed organ pipe is? (Velocity of the sound is equals to 330 metre per second) 1)41 cm 2) 75 cm 3)390 cm 4)482 cm

Discussion

27.	A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is
Answer» A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is

Discussion

28.	When the resistances will be high and low when connected in series and parallel and is it same for capacitance?
Answer» When the resistances will be high and low when connected in series and parallel and is it same for capacitance?

Discussion

29.	A coin is placed at the bottom of a water tank of depth 0.5 m. the critical angle for water is about 49°. The depth changes when we look at the coin at different angles with the surface of water. What is the maximum value of the apparent depth of the coin?
Answer» A coin is placed at the bottom of a water tank of depth 0.5 m. the critical angle for water is about 49°. The depth changes when we look at the coin at different angles with the surface of water. What is the maximum value of the apparent depth of the coin?

Discussion

30.	A ball is projected in vertically upward direction at time t=0 from the ground during its flight it is at same height from the ground at t=3s and t=7s the total time of flight of the ball is
Answer» A ball is projected in vertically upward direction at time t=0 from the ground during its flight it is at same height from the ground at t=3s and t=7s the total time of flight of the ball is

Discussion

31.	A monochromatic parallel beam of light of wavelength λ is incident normally on the plane containing slits S1 and S2. The slits are of unequal width such that intensity only due to one slit on screen is four times that only due to the other slit. The screen is placed along y-axis as shown. The distance between slits is d and that between screen and slit is D. Match the statements in column-I with results in column-II. Column-IColumn-II(A)The distance between two points on screen having equal intensities, such that intensity at those points is (19)th of maximum intensity.(p) Dλ3d(B)The distance between two points on screen having equal intensities, such that intensity at those points is (39)th of maximum intensity.(q) Dλd(C)The distance between two points on screen having equal intensities, such that intensity at those points is (59)th of maximum intensity.(r) 2λDd(D)The distance between two points on screen having equal intensities, such that intensity at those points is (79)th of maximum intensity.(s) 3λDd(t) 2λD3d
Answer» A monochromatic parallel beam of light of wavelength $λ$ is incident normally on the plane containing slits $S_{1}$ and $S_{2}$ . The slits are of unequal width such that intensity only due to one slit on screen is four times that only due to the other slit. The screen is placed along y-axis as shown. The distance between slits is $d$ and that between screen and slit is $D$ . Match the statements in column-I with results in column-II. $\begin{matrix} Column-I & Column-II \begin{matrix} (A)The distance between two points on screen having equal intensities, such that intensity at those points is (\frac{1}{9})^{t h} of maximum intensity. \end{matrix} & (p) \frac{D λ}{3 d} \begin{matrix} (B)The distance between two points on screen having equal intensities, such that intensity at those points is (\frac{3}{9})^{t h} of maximum intensity. \end{matrix} & (q) \frac{D λ}{d} \begin{matrix} (C)The distance between two points on screen having equal intensities, such that intensity at those points is (\frac{5}{9})^{t h} of maximum intensity. \end{matrix} & (r) \frac{2 λ D}{d} \begin{matrix} (D)The distance between two points on screen having equal intensities, such that intensity at those points is (\frac{7}{9})^{t h} of maximum intensity. \end{matrix} & (s) \frac{3 λ D}{d} (t) \frac{2 λ D}{3 d} \end{matrix}$

Discussion

32.	An object is thrown along a direction inclined at an angle of 45∘ with the horizontal direction. The horizontal range of the particle is equal to
Answer» An object is thrown along a direction inclined at an angle of $45^{\circ}$ with the horizontal direction. The horizontal range of the particle is equal to

Discussion

33.	What happens if the force exerted by electric and magnetic field is equal why the cathode rays travel in straight line?
Answer» What happens if the force exerted by electric and magnetic field is equal why the cathode rays travel in straight line?

Discussion

34.	The equivalent capacitance between points A and B is-
Answer» The equivalent capacitance between points $A$ and $B$ is-

Discussion

35.	12. acute angle through which co-ordinate Axes are rotated in order to remove xy term in
Answer» 12. acute angle through which co-ordinate Axes are rotated in order to remove xy term in

Discussion

36.	There is an electric field E in x − direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60∘ with x − axis is 4 J, then what is the value of E ?
Answer» There is an electric field $E$ in x − direction. If the work done on moving a charge of $0.2 C$ through a distance of $2 m$ along a line making an angle $60^{\circ}$ with x − axis is $4 J$ , then what is the value of $E$ ?

Discussion

37.	the acceleration due to gravity on lanet A is 9 times the acceleration due to gravity on planet b .a man jumps to a height of 2 m on the surace of A what is the height of jumpby same person on planet B
Answer» the acceleration due to gravity on lanet A is 9 times the acceleration due to gravity on planet b .a man jumps to a height of 2 m on the surace of A what is the height of jumpby same person on planet B

Discussion

38.	The current in the circuit containing a battery connected to a 2 ohm resistance in 0.9 A. When a resistance of 7 ohm is connected to the battery, the current observed in the circuit is 0.3 A. Then the emf of battery will be
Answer» The current in the circuit containing a battery connected to a 2 ohm resistance in 0.9 A. When a resistance of 7 ohm is connected to the battery, the current observed in the circuit is 0.3 A. Then the emf of battery will be

Discussion

39.	A uniform rod of length L and mass M is pivoted freely at one end and placed in vertical position. What is the angular acceleration of the rod when it is at an angle θ with the vertical?
Answer» A uniform rod of length $L$ and mass $M$ is pivoted freely at one end and placed in vertical position. What is the angular acceleration of the rod when it is at an angle $θ$ with the vertical?

Discussion

40.	A ray of light passing through a prism (μ=√3) suffers minimum deviation. It is found that the angle of incidence is double the angle of refraction within the prism. Then, the angle of prism is (in degrees)
Answer» A ray of light passing through a prism $(μ = \sqrt{3})$ suffers minimum deviation. It is found that the angle of incidence is double the angle of refraction within the prism. Then, the angle of prism is (in degrees)

Discussion

41.	If the error in the measurement of the momentum of a particle is 100℅ then, what will be the error in measurement of kinetic energy of that particle?
Answer» If the error in the measurement of the momentum of a particle is 100℅ then, what will be the error in measurement of kinetic energy of that particle?

Discussion

42.	A glass slab of thickness 2 cm is kept with its base on x-y plane. The direction of incident ray for slab is given by ^A=1√3(^i+^j+^k). The direction of emergent ray will be along:(consider paraxial rays of light)
Answer» A glass slab of thickness 2 cm is kept with its base on x-y plane. The direction of incident ray for slab is given by $^A = \frac{1}{\sqrt{3}} (^i +^j +^k) .$ The direction of emergent ray will be along: (consider paraxial rays of light)

Discussion

43.	The dimension of μ0ϵ0, where symbols have their usual meanings, is -
Answer» The dimension of $μ_{0} ϵ_{0}$ , where symbols have their usual meanings, is -

Discussion

44.	84. A particle would take a time t to move down a straight tube from the surface of earth ( supposed to be a homogenous sphere) to its centre.If gravity were to remain constant then the time would be t�.The ratio t/t� will be a)pi/2sqrt2 b) pi/sqrt2 c) pi sqrt2 d) pi/2
Answer» 84. A particle would take a time t to move down a straight tube from the surface of earth ( supposed to be a homogenous sphere) to its centre.If gravity were to remain constant then the time would be t�.The ratio t/t� will be a)pi/2sqrt2 b) pi/sqrt2 c) pi sqrt2 d) pi/2

Discussion

45.	A mass M is split into two parts, m and (M–m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts
Answer» A mass M is split into two parts, m and (M–m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

Discussion

46.	In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be:-
Answer» In two separate experiments the neutral points due to two small magnets are at a distance of $r$ and $2 r$ in broad side-on position. The ratio of their magnetic moments will be:-

Discussion

47.	Two weights Wi and W2 are suspended to the two strings on a frictiontess pulley. When the W1 is pulled up with an acceleration 'a', then the tension in the string is=
Answer» Two weights Wi and W2 are suspended to the two strings on a frictiontess pulley. When the W1 is pulled up with an acceleration 'a', then the tension in the string is=

Discussion

48.	a vibration magnetometer placed in magnetic meridian has a small bar magnet .the magnet executes oscillations with a time period of 2s in earths horizontal magnetic field of 24 microtesla when a horizontal field of 18 micro tesla is produced opposite to the earths field by placing a current carrying wire the new time period will be
Answer» a vibration magnetometer placed in magnetic meridian has a small bar magnet .the magnet executes oscillations with a time period of 2s in earths horizontal magnetic field of 24 microtesla when a horizontal field of 18 micro tesla is produced opposite to the earths field by placing a current carrying wire the new time period will be

Discussion

49.	If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is
Answer» If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is

Discussion

50.	For a particle moving in a circle of radius 1 m, speed increases uniformly from 5 m/s to 10 m/s in 10 seconds. The value of angular acceleration of the particle is
Answer» For a particle moving in a circle of radius $1 m$ , speed increases uniformly from $5 m/s$ to $10 m/s$ in $10 seconds$ . The value of angular acceleration of the particle is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The trajectory of a projectile is given by the equation y=x−x2. What is the value of the initial velocity and the angle of projection?

A drunkard walking in a narrowlane takes 5steps forward and 3 steps backward eachstep of 1 m long, per second and so on.Determine how long the drunkard takes tofall in a pit 15 m away from the start.

What should be the approximate height of antenna if the TV telecast is to cover a radius of 100 km?

A block of mass 'm' is suspended by different springs of spring constants shown in the figure. Let time period of oscillation in these four positions be T1, T2, T3 and T4. Then

what is the exact value of molar volume? Is it 22.4 or 22.7.

Calculate the potential difference between points A and B in an electric field →E=(2^i+3^j+4^k) NC−1, where the position vectors of points A and B are →rA=(^i−2^j+^k) m and →rB=(2^i+^j−2^k) m respectively.

One mole of an ideal gas undergoes a process, whose process equation is given as P=P01+(V0V)2 Here P0 and V0 are constants. When the volume of the gas is changed from V0 to 3V0, find the change in the temperature of the gas.

In the diagram shown, Q iaf=80 cal and W iaf=50 cal. If W=−30 cal for the curved path along fi, value of Q for path fi, will be

A paramagnetic material has 1028atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8×10−4. Its susceptibility at 300 K is:

A granite rod of 60 cm length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is 2.7×103 kg/m3 and its Young's modulus is 9.27×1010 Pa. What will be the fundamental frequency of the longitudinal vibrations?

Rain is falling vertically with a speed of 12ms−1.A cyclist is moving east to west with a speed of 12√3ms−1.In order to protect himself from rain at what angle he should hold his umbrella w.r.t vertical.

A system absorb 20KJ heat and does 10KJ work then internal energy of system will be(1) decreases by 10 kJ(2) increases by 10 KJ(3) decreases by 30 KJ(4) increases by 30 KJ

a charge q is placed just above the centre of horizontal circle of radius r and hemisphere of the radius is erected about the change compute the electric flux through the closed surface that consist of the hemisphere and the planar circ;e [do not use gauss law]

A uniform electric field E is parallel to the axis of a hollow hemisphere of radius r. The electric flux through the hemispherical surface is

Solve the differential equation sin(x+y)dy/dx = 5

A boat moves relative to water with a velocity v and river is flowing with 2v. At what angle will the boat move with the stream to have minimum drift ?

An uncharged capacitor of capacitance 5 μF is connected to a battery of EMF 50 V at t=0 through a resistance of 2 MΩ, then the time at which rate of energy stored is maximum is -

A particle of mass 10−2 kg is moving along the positive x-axis under the influence of a force, F(x)=−k2x2, where k=10−2Nm2. At time t=0, it is at x=1.0 m and its velocity v=0. The speed of the particle when it reaches x=05 m is

In a situation shown below, if the length of seconds hand is 30π cm, find the magnitude of change in velocity of the tip of the seconds hand.

A space vehicle is traveling at 4300Kmph relative to earth when the exhausted motor (mass 4m) is disengaged and sent back ward with a velocity 82Kmph relative to the command module (mass m) . What is the speed of the command module relative to earth just after separation

Draw a labeled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

Two cars A and B are at rest and at the same point initially. If A starts with uniform velocity of 40 m/s and B starts in the same direction with constant acceleration of 4 m/s2 , then B will catch A after the time

A smooth two dimensional flat plate is exposed to a wind velocity of 80kmph. Laminar boundary layer exists upto Reynolds no.of flow equal to 3×105. The kinematic viscosity of wind is 1.5×10−5m2/sec. The maximum thickness of laminar boundary layer (in mm) is ___.1.75

5.An open organ pipe has a fundamental frequency 300 hertz. The frequency of first overtone of this pipe is the same as the first overtone of the closed organ pipe, the length of the closed organ pipe is? (Velocity of the sound is equals to 330 metre per second) 1)41 cm 2) 75 cm 3)390 cm 4)482 cm

A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is

When the resistances will be high and low when connected in series and parallel and is it same for capacitance?

A coin is placed at the bottom of a water tank of depth 0.5 m. the critical angle for water is about 49°. The depth changes when we look at the coin at different angles with the surface of water. What is the maximum value of the apparent depth of the coin?

A ball is projected in vertically upward direction at time t=0 from the ground during its flight it is at same height from the ground at t=3s and t=7s the total time of flight of the ball is

An object is thrown along a direction inclined at an angle of 45∘ with the horizontal direction. The horizontal range of the particle is equal to

What happens if the force exerted by electric and magnetic field is equal why the cathode rays travel in straight line?

The equivalent capacitance between points A and B is-

12. acute angle through which co-ordinate Axes are rotated in order to remove xy term in

There is an electric field E in x − direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60∘ with x − axis is 4 J, then what is the value of E ?

the acceleration due to gravity on lanet A is 9 times the acceleration due to gravity on planet b .a man jumps to a height of 2 m on the surace of A what is the height of jumpby same person on planet B

The current in the circuit containing a battery connected to a 2 ohm resistance in 0.9 A. When a resistance of 7 ohm is connected to the battery, the current observed in the circuit is 0.3 A. Then the emf of battery will be

A uniform rod of length L and mass M is pivoted freely at one end and placed in vertical position. What is the angular acceleration of the rod when it is at an angle θ with the vertical?

A ray of light passing through a prism (μ=√3) suffers minimum deviation. It is found that the angle of incidence is double the angle of refraction within the prism. Then, the angle of prism is (in degrees)

If the error in the measurement of the momentum of a particle is 100℅ then, what will be the error in measurement of kinetic energy of that particle?

A glass slab of thickness 2 cm is kept with its base on x-y plane. The direction of incident ray for slab is given by ^A=1√3(^i+^j+^k). The direction of emergent ray will be along:(consider paraxial rays of light)

The dimension of μ0ϵ0, where symbols have their usual meanings, is -

84. A particle would take a time t to move down a straight tube from the surface of earth ( supposed to be a homogenous sphere) to its centre.If gravity were to remain constant then the time would be t�.The ratio t/t� will be a)pi/2sqrt2 b) pi/sqrt2 c) pi sqrt2 d) pi/2

A mass M is split into two parts, m and (M–m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be:-

Two weights Wi and W2 are suspended to the two strings on a frictiontess pulley. When the W1 is pulled up with an acceleration 'a', then the tension in the string is=

If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is

For a particle moving in a circle of radius 1 m, speed increases uniformly from 5 m/s to 10 m/s in 10 seconds. The value of angular acceleration of the particle is