50278 + Interview Questions in Physics

1.	10 g of ice at −20∘C is added to 20 g of water at 20∘C. Assuming that no heat is lost to the surrounding, find the temperature of the mixture. [Take, specific heat capacity of ice Ci=2100 J kg−1∘C−1, specific heat capacity of water Cw=4200 J kg−1∘C−1 & Latent heat of fusion of ice L=3.36×105 J kg−1]
Answer» $10 g$ of ice at $- 20^{\circ} C$ is added to $20 g$ of water at $20^{\circ} C$ . Assuming that no heat is lost to the surrounding, find the temperature of the mixture. [Take, specific heat capacity of ice $C_{i} = 2100 {J kg}^{- 1}^{\circ} C^{- 1}$ , specific heat capacity of water $C_{w} = 4200 {J kg}^{- 1}^{\circ} C^{- 1}$ & Latent heat of fusion of ice $L = 3 .36 \times 10^{5} {J kg}^{- 1}$ ]

Discussion

2.	Two fixed charges —2Q and +Q are located at points (-3a, 0) and (+3a, 0) respectively. Then which of the following statement is correct? (a) Points where the electric potential due to the two charges is zero in x-y plane, lie on a circle of radius 4a and centre (5a, 0) (b) Potential is zero at x = a and x =9a (c) Both (a) and (b) are wrong (d) Both (a) and (b) are correct
Answer» Two fixed charges —2Q and +Q are located at points (-3a, 0) and (+3a, 0) respectively. Then which of the following statement is correct? (a) Points where the electric potential due to the two charges is zero in x-y plane, lie on a circle of radius 4a and centre (5a, 0) (b) Potential is zero at x = a and x =9a (c) Both (a) and (b) are wrong (d) Both (a) and (b) are correct

Discussion

3.	Find the derivative of x2+x(sinx) ?
Answer» Find the derivative of $x^{2} + x (s i n x)$ ?

Discussion

4.	The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .
Answer» The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .

Discussion

5.	An incompressible fluid flows between two section as shown in the figure. The flow across the upper surface is kV0bδ, where V0 is inlet velocity and δ is the height of fluid region. The value of k correct up two decimal place is _______.0.35
Answer» An incompressible fluid flows between two section as shown in the figure. The flow across the upper surface is $k V_{0} b δ$ , where $V_{0}$ is inlet velocity and $δ$ is the height of fluid region. The value of $k$ correct up two decimal place is _______. 0.35

Discussion

6.	Why potential gradient is vector quantity if potential is scalar
Answer» Why potential gradient is vector quantity if potential is scalar

Discussion

7.	For the following logic gates circuit, what is the correct expression for the output ?
Answer» For the following logic gates circuit, what is the correct expression for the output ?

Discussion

8.	A non conducting solid sphere of radius r=0.5 m and mass m=2.5 kg has a charge of Q=10 C distributed uniformly over its volume. If the sphere is rotated about a diameter with an angular speed of ω=25 rad/s. Find the magnetic moment (in Am2) and angular momentum (in kgm2/s) of the solid sphere.
Answer» A non conducting solid sphere of radius $r = 0.5 m$ and mass $m = 2.5 kg$ has a charge of $Q = 10 C$ distributed uniformly over its volume. If the sphere is rotated about a diameter with an angular speed of $ω = 25 rad/s$ . Find the magnetic moment (in ${Am}^{2}$ ) and angular momentum (in ${kgm}^{2} / s$ ) of the solid sphere.

Discussion

9.	Is the strength of a bar magnet uniform throughout the material ? If not then how is the strength distributed throughout the magnet ?
Answer» Is the strength of a bar magnet uniform throughout the material ? If not then how is the strength distributed throughout the magnet ?

Discussion

10.	A body of mass m is thrown upwards at an angle θ with the horizontal with velocity v. While rising up the velocity of the mass after t seconds will be
Answer» A body of mass m is thrown upwards at an angle $θ$ with the horizontal with velocity v. While rising up the velocity of the mass after t seconds will be

Discussion

11.	Four particles, each of mass m, are kept at the four corners of a square of edge a. What is the moment of inertia of the system about the line perpendicular to the plane of the square and passing through the centre of the square?
Answer» Four particles, each of mass $m$ , are kept at the four corners of a square of edge $a$ . What is the moment of inertia of the system about the line perpendicular to the plane of the square and passing through the centre of the square?

Discussion

12.	Which of the following energy band diagram shows the N-type semiconductor?
Answer» Which of the following energy band diagram shows the N-type semiconductor?

Discussion

13.	A uniformly charged spherical conductor has a radius of 1m and surface charge density 0.8Cm2. The electric field magnitude because of this at a point 1m radially away, from the surface of the sphere is
Answer» A uniformly charged spherical conductor has a radius of 1m and surface charge density $0.8 \frac{C}{m^{2}}$ . The electric field magnitude because of this at a point 1m radially away, from the surface of the sphere is

Discussion

14.	The following spring block systems having same mass of the block and same spring constants were stretched or compressed to different lengths (x) and released. Match the following:
Answer» The following spring block systems having same mass of the block and same spring constants were stretched or compressed to different lengths (x) and released. Match the following:

14.

The following spring block systems having same mass of the block and same spring constants were stretched or compressed to different lengths (x) and released. Match the following:

Answer»

The following spring block systems having same mass of the block and same spring constants were stretched or compressed to different lengths (x) and released. Match the following:

Discussion

15.	In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 and the distance between the plates is 3 mm.Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?
Answer» In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 and the distance between the plates is 3 mm.Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?

Discussion

16.	A ball is thrown vertically downwards from a heigh tof 20m with ani nitial velocity v^2.It collides witht h eground,loses 50% of its energy in thec ollision and rebounds to the same height.The initial velocity v is?\lbrack g=10m/s^2\rbrack
Answer» A ball is thrown vertically downwards from a heigh tof 20m with ani nitial velocity v^2.It collides witht h eground,loses 50% of its energy in thec ollision and rebounds to the same height.The initial velocity v is?\lbrack g=10m/s^2\rbrack

Discussion

17.	Two spherical bodies, each of mass 50 kg, are placed at a separation of 20 cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the gravitational attraction in magnitude. Find the magnitude of the charge placed on either body.
Answer» Two spherical bodies, each of mass 50 kg, are placed at a separation of 20 cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the gravitational attraction in magnitude. Find the magnitude of the charge placed on either body.

Discussion

18.	13. The frequency of radiation emitted when the electrons falls from n=4 to n=1 in a hydrogen atom will be[given ionisation energy of H=2.18 into 10 power minus 18 j/atom and h= 6.625into 10 minus 34
Answer» 13. The frequency of radiation emitted when the electrons falls from n=4 to n=1 in a hydrogen atom will be[given ionisation energy of H=2.18 into 10 power minus 18 j/atom and h= 6.625into 10 minus 34

Discussion

19.	A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?
Answer» A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?

Discussion

20.	Which of the following compunds is metallic and ferromagnetic?
Answer» Which of the following compunds is metallic and ferromagnetic?

Discussion

21.	Which of the following Electric Field Lines distribution is correct?
Answer» Which of the following Electric Field Lines distribution is correct?

Discussion

22.	The dimensions of e24πω0hc, where e, ω0,h and c are electronic charge, electric permittivity, Planck’s constant and velocity of light in vacuum respectively
Answer» The dimensions of $\frac{e^{2}}{4 π ω_{0} h c}$ , where e, $ω_{0}, h$ and c are electronic charge, electric permittivity, Planck’s constant and velocity of light in vacuum respectively

Discussion

23.	A solid sphere of mass M and radius R has a spherical cavity of radius R2 such that the centre of cavity is at a distance R2 from the centre of the sphere. The force of attraction that this sphere would exert on a particle of mass m which lies at a distance d(>R) from the centre of the solid sphere on the straight line joining the centre of the sphere and the center of cavity is
Answer» A solid sphere of mass $M$ and radius $R$ has a spherical cavity of radius $\frac{R}{2}$ such that the centre of cavity is at a distance $\frac{R}{2}$ from the centre of the sphere. The force of attraction that this sphere would exert on a particle of mass $m$ which lies at a distance $d (> R)$ from the centre of the solid sphere on the straight line joining the centre of the sphere and the center of cavity is

Discussion

24.	Find the ratio of the force of interaction between the 4 kg and 2 kg blocks and 2 kg and 3 kg blocks. (Assume all surfaces to be smooth)
Answer» Find the ratio of the force of interaction between the $4 k g$ and $2 k g$ blocks and $2 k g$ and $3 k g$ blocks. (Assume all surfaces to be smooth)

Discussion

25.	The figure shows the arrangement of conductors a and a' in parallel form in one circuit, while conductors b and b' in parallel form in the return path. Conductor diameter is 2 cm. The total inductance of the line per km (assuming that the current is equally shared by the two parallel conductors) is ______mH/km. 1.305
Answer» The figure shows the arrangement of conductors a and a' in parallel form in one circuit, while conductors b and b' in parallel form in the return path. Conductor diameter is 2 cm. The total inductance of the line per km (assuming that the current is equally shared by the two parallel conductors) is ______ $m H / k m$ . 1.305

Discussion

26.	In the circuit shown in figure, find the current through the branch BD.
Answer» In the circuit shown in figure, find the current through the branch BD.

Discussion

27.	A man is 25 m behind a bus, when the bus starts accelerating at 2 m/s2 and man starts moving with constant velocity of 10 m/s. Time taken by him to board the bus is
Answer» A man is $25 m$ behind a bus, when the bus starts accelerating at $2 {m/s}^{2}$ and man starts moving with constant velocity of $10 m/s$ . Time taken by him to board the bus is

Discussion

28.	A ball is projected upwards from the top of tower with a velocity 50 ms−1 making an angle 30∘ with the horizontal. The height of tower is 70 m. After how many seconds from the instant of throwing will the ball reach the ground
Answer» A ball is projected upwards from the top of tower with a velocity $50 m s^{- 1}$ making an angle $30^{\circ}$ with the horizontal. The height of tower is 70 m. After how many seconds from the instant of throwing will the ball reach the ground

Discussion

29.	Aseries LCR circuitwith L =0.12 H, C =480 nF, R =23 Ω is connected to a 230 V variable frequency supply.(a) Whatis the source frequency for which current amplitude is maximum.Obtain this maximum value.(b) Whatis the source frequency for which average power absorbed by thecircuit is maximum. Obtain the value of this maximum power.(c) Forwhich frequencies of the source is the power transferred to thecircuit half the power at resonant frequency? What is the currentamplitude at these frequencies?(d) What is the Q-factorof the given circuit?
Answer» A series LCR circuit with L = 0.12 H, C = 480 nF, R = 23 Ω is connected to a 230 V variable frequency supply. (a) What is the source frequency for which current amplitude is maximum. Obtain this maximum value. (b) What is the source frequency for which average power absorbed by the circuit is maximum. Obtain the value of this maximum power. (c) For which frequencies of the source is the power transferred to the circuit half the power at resonant frequency? What is the current amplitude at these frequencies? (d) What is the Q-factor of the given circuit?

29.

Aseries LCR circuitwith L =0.12 H, C =480 nF, R =23 Ω is connected to a 230 V variable frequency supply.(a) Whatis the source frequency for which current amplitude is maximum.Obtain this maximum value.(b) Whatis the source frequency for which average power absorbed by thecircuit is maximum. Obtain the value of this maximum power.(c) Forwhich frequencies of the source is the power transferred to thecircuit half the power at resonant frequency? What is the currentamplitude at these frequencies?(d) What is the Q-factorof the given circuit?

Answer»

A
series LCR circuit
with L =
0.12 H, C =
480 nF, R =
23 Ω is connected to a 230 V variable frequency supply.

(a) What
is the source frequency for which current amplitude is maximum.
Obtain this maximum value.

(b) What
is the source frequency for which average power absorbed by the
circuit is maximum. Obtain the value of this maximum power.

(c) For
which frequencies of the source is the power transferred to the
circuit half the power at resonant frequency? What is the current
amplitude at these frequencies?

(d)
What is the Q-factor
of the given circuit?

Discussion

30.	35. A 5kg block is resting on a frictionless plane. It is struck by a jet, releasing water at the rate of 3kg/s emerging with a a speed of 4m/s. Calculate the initial acceleration of the block
Answer» 35. A 5kg block is resting on a frictionless plane. It is struck by a jet, releasing water at the rate of 3kg/s emerging with a a speed of 4m/s. Calculate the initial acceleration of the block

Discussion

31.	a thin film of water (u=4/3) is 3100Å thick. If its illuminated by white light at normal incidence. The colour of film in the reflected light will be what ?
Answer» a thin film of water (u=4/3) is 3100Å thick. If its illuminated by white light at normal incidence. The colour of film in the reflected light will be what ?

Discussion

32.	A nucleus X is in the higher energy state where its energy is 450 keV . If it comes to ground state (assuming ground state energy to be zero), what is the wavelength of the photon emitted?
Answer» A nucleus X is in the higher energy state where its energy is 450 keV . If it comes to ground state (assuming ground state energy to be zero), what is the wavelength of the photon emitted?

Discussion

33.	Corresponding to point A on acceleration time (a-t) curve of a particle executing SHM, there is a point 1 or 2 or 3 or 4 on velocity time (v-t) curve of the motion. The starting value of time on x-axis is different for two curves. Find the point:
Answer» Corresponding to point A on acceleration time (a-t) curve of a particle executing SHM, there is a point 1 or 2 or 3 or 4 on velocity time (v-t) curve of the motion. The starting value of time on x-axis is different for two curves. Find the point:

33.

Corresponding to point A on acceleration time (a-t) curve of a particle executing SHM, there is a point 1 or 2 or 3 or 4 on velocity time (v-t) curve of the motion. The starting value of time on x-axis is different for two curves. Find the point:

Answer»

Corresponding to point A on acceleration time (a-t) curve of a particle executing SHM, there is a point 1 or 2 or 3 or 4 on velocity time (v-t) curve of the motion. The starting value of time on x-axis is different for two curves. Find the point:

Discussion

34.	A 6 V battery of negligible internal resistance is connected across a uniform wire of length 1 m. The positive terminal of another battery of emf 4 V and internal resistance 1 Ω is joined to the point A as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point C. The length of AC is equal to:
Answer» A $6 V$ battery of negligible internal resistance is connected across a uniform wire of length $1 m$ . The positive terminal of another battery of emf $4 V$ and internal resistance $1 Ω$ is joined to the point $A$ as shown in figure. The ammeter shows zero deflection when the jockey touches the wire at the point $C$ . The length of $A C$ is equal to:

Discussion

35.	what is inert pair effect in simple word
Answer» what is inert pair effect in simple word

Discussion

36.	A man wants to cross the river to an exactly opposite point on the other bank. If he can row his boat with 2√3 times the velocity of the current, then at what angle to the current he must keep the boat pointed ?
Answer» A man wants to cross the river to an exactly opposite point on the other bank. If he can row his boat with $\frac{2}{\sqrt{3}}$ times the velocity of the current, then at what angle to the current he must keep the boat pointed ?

Discussion

37.	If the reading of voltmeter V shown in the figure at resonance is 200 V, then the quality factor of the circuit is,
Answer» If the reading of voltmeter $V$ shown in the figure at resonance is $200 V$ , then the quality factor of the circuit is,

Discussion

38.	Find the distance covered by a particle during the time interval t=0 and t=4s for which the speed time graph is shown in figure [3 MARKS]
Answer» Find the distance covered by a particle during the time interval t=0 and t=4s for which the speed time graph is shown in figure [3 MARKS]

Discussion

39.	A wire of mass m kg with uniform cross section is bent in the shape as shown in figure. If origin is taken at O, find the co-ordinates of the center of mass of the given system (in metres).
Answer» A wire of mass $m kg$ with uniform cross section is bent in the shape as shown in figure. If origin is taken at $O$ , find the co-ordinates of the center of mass of the given system (in metres).

Discussion

40.	Water rises to a height of 10 cm in a capillary tube and mercury falls to a depth of √2 cm in the same capillary tube. If the density of mercury is ≈14 g/cm3 and angle of contact is 135∘, the ratio of surface tension for water and mercury is (Angle of contact for water and glass is 0∘).
Answer» Water rises to a height of $10 cm$ in a capillary tube and mercury falls to a depth of $\sqrt{2} cm$ in the same capillary tube. If the density of mercury is $\approx 14 {g/cm}^{3}$ and angle of contact is $135^{\circ}$ , the ratio of surface tension for water and mercury is (Angle of contact for water and glass is $0^{\circ}$ ).

Discussion

41.	Find the currents through the resistances in the circuits shown in figure (45-E3).
Answer» Find the currents through the resistances in the circuits shown in figure (45-E3).

41.

Find the currents through the resistances in the circuits shown in figure (45-E3).

Answer»

Find the currents through the resistances in the circuits shown in figure (45-E3).

Discussion

42.	An object is placed in front of a convex mirror of focal length 30 cm. if the image fomedsize of the object, then the position of the image from the mirror is(1) 15 cm(3) 60 cm(2) 18 om(4) 45 cm
Answer» An object is placed in front of a convex mirror of focal length 30 cm. if the image fomedsize of the object, then the position of the image from the mirror is(1) 15 cm(3) 60 cm(2) 18 om(4) 45 cm

Discussion

43.	14. A force + = (2+3j -5k) N acts at a point74 = (2 +43 +7k)m. The torque of the force aboutthe point 7a = (i +2° +3k)m is(1) (179 +5k – 3î) Nm (2) (21+4) - 6k) Nm(3) (12ť – 5j +7ỉ) Nm (4) (13) – 22 – k) Nm
Answer» 14. A force + = (2+3j -5k) N acts at a point 74 = (2 +43 +7k)m. The torque of the force about the point 7a = (i +2° +3k)m is (1) (179 +5k – 3î) Nm (2) (21+4) - 6k) Nm (3) (12ť – 5j +7ỉ) Nm (4) (13) – 22 – k) Nm

Discussion

44.	A wheel of radius R rolls forward half a revolution . The displacement of a point which is at height R from the point initially in contact to ground is
Answer» A wheel of radius R rolls forward half a revolution . The displacement of a point which is at height R from the point initially in contact to ground is

Discussion

45.	Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a rigid wall (Fig. 5.21). The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally to A. What are (a) the reaction of the partition (b) the action-reaction forces between A and B?What happens when the wall is removed? Does the answer to (b) change, when the bodies are in motion? Ignore the difference between μs and μk.Fig. 5.21
Answer» Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a rigid wall (Fig. 5.21). The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally to A. What are (a) the reaction of the partition (b) the action-reaction forces between A and B?What happens when the wall is removed? Does the answer to (b) change, when the bodies are in motion? Ignore the difference between μ_s and μ_k. Fig. 5.21

45.

Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a rigid wall (Fig. 5.21). The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally to A. What are (a) the reaction of the partition (b) the action-reaction forces between A and B?What happens when the wall is removed? Does the answer to (b) change, when the bodies are in motion? Ignore the difference between μs and μk.Fig. 5.21

Answer»

Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a rigid wall (Fig. 5.21). The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally to A. What are (a) the reaction of the partition (b) the action-reaction forces between A and B?What happens when the wall is removed? Does the answer to (b) change, when the bodies are in motion? Ignore the difference between μ_s and μ_k.

Fig. 5.21

Discussion

46.	a pebble was thrown horizontally at a speed of 3 metre per second took 0.8 second to hit the water from what height was the pebbel throne
Answer» a pebble was thrown horizontally at a speed of 3 metre per second took 0.8 second to hit the water from what height was the pebbel throne

Discussion

47.	A force F is applied on a block of mass 75 kg at an angle of 53∘ with the horizontal. If the coefficient of friction between the floor and the block is 0.6, then what is the maximum value of force F that can be applied before the block starts moving?
Answer» A force $F$ is applied on a block of mass $75 kg$ at an angle of $53^{\circ}$ with the horizontal. If the coefficient of friction between the floor and the block is $0.6$ , then what is the maximum value of force $F$ that can be applied before the block starts moving?

Discussion

48.	When a ray is refracted from one medium to another, the wavelength changes from 600∘A to 400∘A. The critical angle for the interface will be
Answer» When a ray is refracted from one medium to another, the wavelength changes from $600 \circ A t o 400 \circ A$ . The critical angle for the interface will be

Discussion

49.	A plane is pulling out for a dive at a speed 720 km/h. Assuming its path to be vertical circle of radius 1000 m and its mass to be 15000 kg, find the force exerted by the air on it at the lowest point. (Take g=10 m/s2)
Answer» A plane is pulling out for a dive at a speed $720 km/h$ . Assuming its path to be vertical circle of radius $1000 m$ and its mass to be $15000 kg$ , find the force exerted by the air on it at the lowest point. (Take $g = 10 {m/s}^{2}$ )

Discussion

50.	The inert gas abundantly found in atmoshpere is:
Answer» The inert gas abundantly found in atmoshpere is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the derivative of x2+x(sinx) ?

The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .

An incompressible fluid flows between two section as shown in the figure. The flow across the upper surface is kV0bδ, where V0 is inlet velocity and δ is the height of fluid region. The value of k correct up two decimal place is _______.0.35

Why potential gradient is vector quantity if potential is scalar

For the following logic gates circuit, what is the correct expression for the output ?

A non conducting solid sphere of radius r=0.5 m and mass m=2.5 kg has a charge of Q=10 C distributed uniformly over its volume. If the sphere is rotated about a diameter with an angular speed of ω=25 rad/s. Find the magnetic moment (in Am2) and angular momentum (in kgm2/s) of the solid sphere.

Is the strength of a bar magnet uniform throughout the material ? If not then how is the strength distributed throughout the magnet ?

A body of mass m is thrown upwards at an angle θ with the horizontal with velocity v. While rising up the velocity of the mass after t seconds will be

Four particles, each of mass m, are kept at the four corners of a square of edge a. What is the moment of inertia of the system about the line perpendicular to the plane of the square and passing through the centre of the square?

Which of the following energy band diagram shows the N-type semiconductor?

A uniformly charged spherical conductor has a radius of 1m and surface charge density 0.8Cm2. The electric field magnitude because of this at a point 1m radially away, from the surface of the sphere is

The following spring block systems having same mass of the block and same spring constants were stretched or compressed to different lengths (x) and released. Match the following:

In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 and the distance between the plates is 3 mm.Calculate the capacitance of the capacitor. If this capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?

A ball is thrown vertically downwards from a heigh tof 20m with ani nitial velocity v^2.It collides witht h eground,loses 50% of its energy in thec ollision and rebounds to the same height.The initial velocity v is?\lbrack g=10m/s^2\rbrack

Two spherical bodies, each of mass 50 kg, are placed at a separation of 20 cm. Equal charges are placed on the bodies and it is found that the force of Coulomb repulsion equals the gravitational attraction in magnitude. Find the magnitude of the charge placed on either body.

13. The frequency of radiation emitted when the electrons falls from n=4 to n=1 in a hydrogen atom will be[given ionisation energy of H=2.18 into 10 power minus 18 j/atom and h= 6.625into 10 minus 34

A straight current carrying conductor is placed in a magnetic field but no force acts on it. What can be the reason behind this?

Which of the following compunds is metallic and ferromagnetic?

Which of the following Electric Field Lines distribution is correct?

The dimensions of e24πω0hc, where e, ω0,h and c are electronic charge, electric permittivity, Planck’s constant and velocity of light in vacuum respectively

Find the ratio of the force of interaction between the 4 kg and 2 kg blocks and 2 kg and 3 kg blocks. (Assume all surfaces to be smooth)

In the circuit shown in figure, find the current through the branch BD.

A man is 25 m behind a bus, when the bus starts accelerating at 2 m/s2 and man starts moving with constant velocity of 10 m/s. Time taken by him to board the bus is

A ball is projected upwards from the top of tower with a velocity 50 ms−1 making an angle 30∘ with the horizontal. The height of tower is 70 m. After how many seconds from the instant of throwing will the ball reach the ground

35. A 5kg block is resting on a frictionless plane. It is struck by a jet, releasing water at the rate of 3kg/s emerging with a a speed of 4m/s. Calculate the initial acceleration of the block

a thin film of water (u=4/3) is 3100Å thick. If its illuminated by white light at normal incidence. The colour of film in the reflected light will be what ?

A nucleus X is in the higher energy state where its energy is 450 keV . If it comes to ground state (assuming ground state energy to be zero), what is the wavelength of the photon emitted?

Corresponding to point A on acceleration time (a-t) curve of a particle executing SHM, there is a point 1 or 2 or 3 or 4 on velocity time (v-t) curve of the motion. The starting value of time on x-axis is different for two curves. Find the point:

what is inert pair effect in simple word

A man wants to cross the river to an exactly opposite point on the other bank. If he can row his boat with 2√3 times the velocity of the current, then at what angle to the current he must keep the boat pointed ?

If the reading of voltmeter V shown in the figure at resonance is 200 V, then the quality factor of the circuit is,

Find the distance covered by a particle during the time interval t=0 and t=4s for which the speed time graph is shown in figure [3 MARKS]

A wire of mass m kg with uniform cross section is bent in the shape as shown in figure. If origin is taken at O, find the co-ordinates of the center of mass of the given system (in metres).

Water rises to a height of 10 cm in a capillary tube and mercury falls to a depth of √2 cm in the same capillary tube. If the density of mercury is ≈14 g/cm3 and angle of contact is 135∘, the ratio of surface tension for water and mercury is (Angle of contact for water and glass is 0∘).

Find the currents through the resistances in the circuits shown in figure (45-E3).

An object is placed in front of a convex mirror of focal length 30 cm. if the image fomedsize of the object, then the position of the image from the mirror is(1) 15 cm(3) 60 cm(2) 18 om(4) 45 cm

14. A force + = (2+3j -5k) N acts at a point74 = (2 +43 +7k)m. The torque of the force aboutthe point 7a = (i +2° +3k)m is(1) (179 +5k – 3î) Nm (2) (21+4) - 6k) Nm(3) (12ť – 5j +7ỉ) Nm (4) (13) – 22 – k) Nm

A wheel of radius R rolls forward half a revolution . The displacement of a point which is at height R from the point initially in contact to ground is

a pebble was thrown horizontally at a speed of 3 metre per second took 0.8 second to hit the water from what height was the pebbel throne

A force F is applied on a block of mass 75 kg at an angle of 53∘ with the horizontal. If the coefficient of friction between the floor and the block is 0.6, then what is the maximum value of force F that can be applied before the block starts moving?

When a ray is refracted from one medium to another, the wavelength changes from 600∘A to 400∘A. The critical angle for the interface will be

A plane is pulling out for a dive at a speed 720 km/h. Assuming its path to be vertical circle of radius 1000 m and its mass to be 15000 kg, find the force exerted by the air on it at the lowest point. (Take g=10 m/s2)

The inert gas abundantly found in atmoshpere is: