50278 + Interview Questions in Physics

1.	A coil has a resistance of 10Ω and an inductance of 0.4 henry. It is connected to an AC source of 6.5 V, 30π Hz. Find the average power consumed in the circuit.
Answer» A coil has a resistance of $10 Ω$ and an inductance of 0.4 henry. It is connected to an AC source of 6.5 V, $\frac{30}{π}$ Hz. Find the average power consumed in the circuit.

Discussion

2.	A block of mass m containing a net positive charge q is placed ona smooth horizontal table which terminates in a vertical wall as shown in figure (29-E2).The distance of the block from the wall is d. A horizontal electric field E towards right is switched on. Assuming elastic collisions (if any) find he time period of the resulting oscillatory motion. Is it a simple sharmonic motion?
Answer» A block of mass m containing a net positive charge q is placed ona smooth horizontal table which terminates in a vertical wall as shown in figure (29-E2).The distance of the block from the wall is d. A horizontal electric field E towards right is switched on. Assuming elastic collisions (if any) find he time period of the resulting oscillatory motion. Is it a simple sharmonic motion?

Discussion

3.	Angle of inclination of the water surface from horizontal for the given accelerated container shown in the figure is [Assume g=10 m/s2]
Answer» Angle of inclination of the water surface from horizontal for the given accelerated container shown in the figure is [Assume $g = 10 {m/s}^{2}$ ]

Discussion

4.	A body is executing simple harmonic motion. At a displacement x, its potential energy is E1 and at a displacement y, its potential energy is E2. The potential energy E at a displacement (x+y) is
Answer» A body is executing simple harmonic motion. At a displacement x, its potential energy is $E_{1}$ and at a displacement $y$ , its potential energy is $E_{2}$ . The potential energy $E$ at a displacement $(x + y)$ is

Discussion

5.	In the arrangement shown if figure (42-E4), y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photo current.
Answer» In the arrangement shown if figure (42-E4), y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photo current.

5.

In the arrangement shown if figure (42-E4), y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photo current.

Answer»

In the arrangement shown if figure (42-E4), y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photo current.

Discussion

6.	Hydrogen (H), deuterium (D), singly ionized helium (He+) and doubly ionized lithium (Li++) all have one electron around the nucleus. Consider n = 2 to n = 1 transition. The wavelengths of emitted radiations are λ1,λ2,λ3 and λ4 respectively. Then approximately
Answer» Hydrogen (H), deuterium (D), singly ionized helium $(H e^{+})$ and doubly ionized lithium $(L i^{+ +})$ all have one electron around the nucleus. Consider n = 2 to n = 1 transition. The wavelengths of emitted radiations are $λ_{1}, λ_{2}, λ_{3}$ and $λ_{4}$ respectively. Then approximately

Discussion

7.	A bus and a car start from rest and run along a straight line with constant acceleration of 2 m/s2 and 3 m/s2 respectively, with the car behind the bus at distance of 100 m. How long in seconds will it take before both the bus and car travel side by side? Answer upto 2 decimal places
Answer» A bus and a car start from rest and run along a straight line with constant acceleration of $2 m / s^{2}$ and $3 m / s^{2}$ respectively, with the car behind the bus at distance of $100 m$ . How long in seconds will it take before both the bus and car travel side by side? Answer upto 2 decimal places

Discussion

8.	Electrode potential for Mg electrode varies according to the equation. EMg2+Mg=E∘Mg2+Mg−0.0592log(1Mg2+) The graph of EMg2+Mgvslog[Mg2+] is
Answer» Electrode potential for Mg electrode varies according to the equation. $E_{\frac{M g^{2 +}}{M g}} = E_{\frac{M g^{2 +}}{M g}}^{\circ} - \frac{0.059}{2} l o g (\frac{1}{M g^{2 +}})$ The graph of $E_{\frac{M g^{2 +}}{M g}} v s l o g [M g^{2 +}]$ is

Discussion

9.	The rate of steady volume flow of water through a capillary tube of length 'l' and radius 'r' under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)
Answer» The rate of steady volume flow of water through a capillary tube of length 'l' and radius 'r' under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)

Discussion

10.	Find net dipole moment of given charge configuration.
Answer» Find net dipole moment of given charge configuration.

Discussion

11.	The speed of a projectile at the highest point becomes 1√2times its initial speed. The horizontal range of the projectile will be
Answer» The speed of a projectile at the highest point becomes $\frac{1}{\sqrt{2}}$ times its initial speed. The horizontal range of the projectile will be

Discussion

12.	Find the area of the parallelogram whose adjacent sides are determined by the vectors →a=^i−^j+3^k and →b=2^i−7^j+^k.
Answer» Find the area of the parallelogram whose adjacent sides are determined by the vectors $\to a =^i -^j + 3^k and \to b = 2^i - 7^j +^k$ .

Discussion

13.	When 100 V dc is applied across a solenoid, a current of 1.0 A flows in it. When 100 V ac is applied across the same coil, the current drops to 0.5 A. If the frequency of the ac source is 5o Hz, the impedance and inductance of the solenoid are
Answer» When 100 V dc is applied across a solenoid, a current of 1.0 A flows in it. When 100 V ac is applied across the same coil, the current drops to 0.5 A. If the frequency of the ac source is 5o Hz, the impedance and inductance of the solenoid are

Discussion

14.	Explain how the maximum height of mountain on earth can be estimated from elastic behaviour of earth
Answer» Explain how the maximum height of mountain on earth can be estimated from elastic behaviour of earth

Discussion

15.	If for two vectors →A and →B, sum (→A+→b) is perpendicular to the difference (→A−→B) Find the ratio of the magnitude (AB).
Answer» If for two vectors $\to A$ and $\to B$ , sum $(\to A + \to b)$ is perpendicular to the difference $(\to A - \to B)$ Find the ratio of the magnitude $(\frac{A}{B})$ .

15.

If for two vectors →A and →B, sum (→A+→b) is perpendicular to the difference (→A−→B) Find the ratio of the magnitude (AB).

Answer»

If for two vectors $\to A$ and $\to B$ , sum $(\to A + \to b)$ is perpendicular to the difference $(\to A - \to B)$

Find the ratio of the magnitude $(\frac{A}{B})$ .

Discussion

16.	What is the acceleration /time =?
Answer» What is the acceleration /time =?

Discussion

17.	Light is confined within the core of a simple optical fiber by:
Answer» Light is confined within the core of a simple optical fiber by:

Discussion

18.	The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth is
Answer» The work done to raise a mass $m$ from the surface of the earth to a height $h$ , which is equal to the radius of the earth is

Discussion

19.	An electron jumps from n = 4 to n = 1 state in H-atom. The recoil momentum of H-atom (in eV/C) is
Answer» An electron jumps from n = 4 to n = 1 state in H-atom. The recoil momentum of H-atom (in eV/C) is

Discussion

20.	The above spring block system does Linear SHM. It takes the block 10 sec to move from the mean position to extreme position that is 5m away. Which of the given options are correct?
Answer» The above spring block system does Linear SHM. It takes the block 10 sec to move from the mean position to extreme position that is 5m away. Which of the given options are correct?

20.

The above spring block system does Linear SHM. It takes the block 10 sec to move from the mean position to extreme position that is 5m away. Which of the given options are correct?

Answer»

The above spring block system does Linear SHM. It takes the block 10 sec to move from the mean position to extreme position that is 5m away. Which of the given options are correct?

Discussion

21.	Polyurethane is quite good for cold weather for jackets and blankets. However, thermal emergency blankets or space blankets are often made up of something similar to aluminum foil and used by astronauts to avoid hypothermia when stuck in subzero temperature. Why do you think it is a good choice?
Answer» Polyurethane is quite good for cold weather for jackets and blankets. However, thermal emergency blankets or space blankets are often made up of something similar to aluminum foil and used by astronauts to avoid hypothermia when stuck in subzero temperature. Why do you think it is a good choice?

Discussion

22.	Let X=¯¯¯¯¯¯¯¯¯¯¯¯ABC+¯¯¯¯¯¯¯¯¯¯¯¯BCA+¯¯¯¯¯¯¯¯¯¯¯¯¯¯CAB. Evaluate X for (a) A=1, B=0, C=1, (b) A=B=C=1, and (c) A=B=C=0.
Answer» Let $X = ¯ ¯¯¯¯¯¯¯¯¯¯ ¯ A B C + ¯ ¯¯¯¯¯¯¯¯¯¯ ¯ B C A + ¯ ¯¯¯¯¯¯¯¯¯¯¯¯ ¯ C A B .$ Evaluate X for (a) $A = 1, B = 0, C = 1,$ (b) $A = B = C = 1,$ and (c) $A = B = C = 0.$

22.

Let X=¯¯¯¯¯¯¯¯¯¯¯¯ABC+¯¯¯¯¯¯¯¯¯¯¯¯BCA+¯¯¯¯¯¯¯¯¯¯¯¯¯¯CAB. Evaluate X for (a) A=1, B=0, C=1, (b) A=B=C=1, and (c) A=B=C=0.

Answer»

Let $X = ¯ ¯¯¯¯¯¯¯¯¯¯ ¯ A B C + ¯ ¯¯¯¯¯¯¯¯¯¯ ¯ B C A + ¯ ¯¯¯¯¯¯¯¯¯¯¯¯ ¯ C A B .$ Evaluate X for

(a) $A = 1, B = 0, C = 1,$ (b) $A = B = C = 1,$ and (c) $A = B = C = 0.$

Discussion

23.	A point dipole is placed near to a metallic conductor. Find an electric field due to induced charge at point A.
Answer» A point dipole is placed near to a metallic conductor. Find an electric field due to induced charge at point A.

Discussion

24.	A current of 5.0 A exists in the circuit shown in figure (34 - E3). The wire PQ has a length of 50 cm and the magnetic field in which it is immersed has a magnitude of 0.20 T. Find the magnetic force acting on the wire PQ.
Answer» A current of 5.0 A exists in the circuit shown in figure (34 - E3). The wire PQ has a length of 50 cm and the magnetic field in which it is immersed has a magnitude of 0.20 T. Find the magnetic force acting on the wire PQ.

24.

A current of 5.0 A exists in the circuit shown in figure (34 - E3). The wire PQ has a length of 50 cm and the magnetic field in which it is immersed has a magnitude of 0.20 T. Find the magnetic force acting on the wire PQ.

Answer»

A current of 5.0 A exists in the circuit shown in figure (34 - E3). The wire PQ has a length of 50 cm and the magnetic field in which it is immersed has a magnitude of 0.20 T. Find the magnetic force acting on the wire PQ.

Discussion

25.	A gun fires 20 bullets/sec each of mass 20 gm, with a muzzle velocity of 50 m/s. Find the force required to hold the gun in position.
Answer» A gun fires $20$ bullets/sec each of mass $20 gm$ , with a muzzle velocity of $50 m/s$ . Find the force required to hold the gun in position.

Discussion

26.	Which of the following statement is not correct
Answer» Which of the following statement is not correct

Discussion

27.	A small object is embedded in a glass sphere (μ=1.5) of radius 5.0 cm at a distance 1.5 cm left to the centre. Locate the image of the object as seen by an observer standing (a) To the left of the sphere and (b) To the right of the sphere.
Answer» A small object is embedded in a glass sphere $(μ = 1.5)$ of radius 5.0 cm at a distance 1.5 cm left to the centre. Locate the image of the object as seen by an observer standing (a) To the left of the sphere and (b) To the right of the sphere.

27.

A small object is embedded in a glass sphere (μ=1.5) of radius 5.0 cm at a distance 1.5 cm left to the centre. Locate the image of the object as seen by an observer standing (a) To the left of the sphere and (b) To the right of the sphere.

Answer»

A small object is embedded in a glass sphere $(μ = 1.5)$ of radius 5.0 cm at a distance 1.5 cm left to the centre. Locate the image of the object as seen by an observer standing

(a) To the left of the sphere and

(b) To the right of the sphere.

Discussion

28.	The radius of a gold nucleus (Z=79) is about 7.0×10−15 m. Assume that the positive charge is distributed uniformly throughout the nuclear volume. Find the strength of the electric field at (a) the surface of the nucleus and (b) at the middle point of a radius. Remembering that gold is a conductor, is it justified to assume that the positive charge is uniformly distributed over the entire volume of the nucleus and does not come to the outer surface ?
Answer» The radius of a gold nucleus (Z=79) is about $7.0 \times 10^{- 15} m$ . Assume that the positive charge is distributed uniformly throughout the nuclear volume. Find the strength of the electric field at (a) the surface of the nucleus and (b) at the middle point of a radius. Remembering that gold is a conductor, is it justified to assume that the positive charge is uniformly distributed over the entire volume of the nucleus and does not come to the outer surface ?

Discussion

29.	In the Bohr’s model of hydrogen atom, the electrons moves around the nucleus in a circular orbit of a radius 5×10−11 metre. It’s time period is 1.5×10−16 sec. The current associated is
Answer» In the Bohr’s model of hydrogen atom, the electrons moves around the nucleus in a circular orbit of a radius $5 \times 10^{- 11}$ metre. It’s time period is $1.5 \times 10^{- 16}$ sec. The current associated is

Discussion

30.	A curve has a radius of 50 m and a banking angle (θ) of 15∘. What is the maximum safe speed for a car on this curve if the road does not offer any friction? Take g=10 m/s2.
Answer» A curve has a radius of $50 m$ and a banking angle ( $θ$ ) of $15^{\circ}$ . What is the maximum safe speed for a car on this curve if the road does not offer any friction? Take $g = 10 {m/s}^{2}$ .

Discussion

31.	A uniform rod of length L and mass m is placed on rough horizontal surface.If coefficient of friction is μ=kx,where k is constant and μ exist for 0≤ x≤ L (i.e for x>L friction is zero.). If rod moves towards the right, magnitude of work done by friction is:
Answer» A uniform rod of length L and mass m is placed on rough horizontal surface.If coefficient of friction is $μ = k x$ ,where k is constant and $μ$ exist for $0 \leq x \leq L$ (i.e for $x > L$ friction is zero.). If rod moves towards the right, magnitude of work done by friction is:

Discussion

32.	Current is given as i=2√t. RMS value of current between t = 0 to t = 2 sec is
Answer» Current is given as $i = 2 \sqrt{t}$ . RMS value of current between t = 0 to t = 2 sec is

Discussion

33.	Why does mass get accumulated when a body moves with high speed?
Answer» Why does mass get accumulated when a body moves with high speed?

Discussion

34.	An ant starts crawling from the bottom of a bowl of radius r, having coefficient of friction μ. The maximum vertical height h up to which it can reach is
Answer» An ant starts crawling from the bottom of a bowl of radius $r$ , having coefficient of friction $μ$ . The maximum vertical height $h$ up to which it can reach is

Discussion

35.	A charge 4C is placed at the origin, what is the electric potential at a point (3,4,0)?
Answer» A charge 4C is placed at the origin, what is the electric potential at a point (3,4,0)?

Discussion

36.	Starting from rest, a fan takes four seconds to attain the maximum speed of 800 rpm (revolutions per minute). Assuming uniform acceleration, calculate the time taken by the fan in attaining half the maximum speed.
Answer» Starting from rest, a fan takes four seconds to attain the maximum speed of $800 rpm$ (revolutions per minute). Assuming uniform acceleration, calculate the time taken by the fan in attaining half the maximum speed.

Discussion

37.	A uniform slender rod of length L, cross sectional area A and Young’s modulus Y is acted upon by the forces shown in the figure. The elongation of the rod is
Answer» A uniform slender rod of length L, cross sectional area A and Young’s modulus Y is acted upon by the forces shown in the figure. The elongation of the rod is

Discussion

38.	An aero plane is flying horizontally with a constant velocity of 100 km ph−1 at a height of 1 km from the ground level. At t = 0, it start dropping packets at constant time interval of I0. If R represents the separation between two consecutive points of impact on the ground then for the first 3 packetsR1:R2 is
Answer» An aero plane is flying horizontally with a constant velocity of 100 km $p h^{- 1}$ at a height of 1 km from the ground level. At t = 0, it start dropping packets at constant time interval of $I_{0}$ . If R represents the separation between two consecutive points of impact on the ground then for the first 3 packets $R_{1} : R_{2}$ is

Discussion

39.	A current I is passing through a wire having two sections P and Q of uniform diameters d and d2 respectively. If the mean drift velocity of electrons in section P and Q is denoted by vp and vq respectively, then
Answer» A current I is passing through a wire having two sections P and Q of uniform diameters d and $\frac{d}{2}$ respectively. If the mean drift velocity of electrons in section P and Q is denoted by $v_{p}$ and $v_{q}$ respectively, then

Discussion

40.	A particle of mass m is driven by a machine that delivers a constant power of K watts. If the particle starts from rest the force on then particle at time t is :
Answer» A particle of mass m is driven by a machine that delivers a constant power of K watts. If the particle starts from rest the force on then particle at time t is :

Discussion

41.	A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking from A to B is not equal to the work done in taking from B to A. If Wnc and Wc are the works done by non-conservative forces and conservative forces present in the system respectively, Δ U is the change in potential energy, Δ K is the change in kinetic energy, then which of the following is wrong?
Answer» A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking from A to B is not equal to the work done in taking from B to A. If $W_{n c}$ and $W_{c}$ are the works done by non-conservative forces and conservative forces present in the system respectively, $Δ U$ is the change in potential energy, $Δ K$ is the change in kinetic energy, then which of the following is wrong?

Discussion

42.	Two similar rods are joined as shown in figure, then temperature of junction is (assume no heat loss through lateral surface of rod and temperatures at the ends are shown in steady state condition)
Answer» Two similar rods are joined as shown in figure, then temperature of junction is (assume no heat loss through lateral surface of rod and temperatures at the ends are shown in steady state condition)

Discussion

43.	The current i in an induction coil varies with time t according to the graph shown in the figure. Which of the following graphs shows the induced EMF in the coil with time?
Answer» The current $i$ in an induction coil varies with time $t$ according to the graph shown in the figure. Which of the following graphs shows the induced EMF in the coil with time?

Discussion

44.	A capacitor C1=12 μF charged with voltage 4 V is connected across uncharged capacitor C2=4 μF and resistor 2 Ω. At t=0, switch S is closed. At t=t0, voltage across C1 is 3 V, then current in circuit (in A) at t=t0 is (Answer upto two decimal places )
Answer» A capacitor $C_{1} = 12 μ F$ charged with voltage 4 V is connected across uncharged capacitor $C_{2} = 4 μ F$ and resistor 2 $Ω$ . At $t = 0$ , switch S is closed. At $t = t_{0}$ , voltage across $C_{1}$ is 3 V, then current in circuit (in A) at $t = t_{0}$ is (Answer upto two decimal places )

Discussion

45.	The minimum value of sin(θ)cos(θ) is
Answer» The minimum value of $sin (θ) cos (θ)$ is

Discussion

46.	The dimensional representation of Planck’s constant is identical to that of
Answer» The dimensional representation of Planck’s constant is identical to that of

Discussion

47.	A thin circular plate of mass M and radius R has its density varying as ρ(r)=ρ0r with ρ0 as constant and r is the distance from its centre. The moment of inertia of the circular plate about an axis perpendicular to the plate and passing through its edge is I=aMR2. The value of the coefficient a is
Answer» A thin circular plate of mass $M$ and radius $R$ has its density varying as $ρ (r) = ρ_{0} r$ with $ρ_{0}$ as constant and $r$ is the distance from its centre. The moment of inertia of the circular plate about an axis perpendicular to the plate and passing through its edge is $I = a M R^{2}$ . The value of the coefficient $a$ is

Discussion

48.	In the following equation x. t and F represent respectively displacement, time and force: F=a+bt+1c+dx+A sin(ωt+ϕ). The dimensional formula for Ad is
Answer» In the following equation x. t and F represent respectively displacement, time and force: $F = a + b t + \frac{1}{c + d x} + A s i n (ω t + ϕ)$ . The dimensional formula for Ad is

Discussion

49.	If a rod of mass 0.2 kg is in equilibria in given condition then friction force acting on rod in newtons is. [Force F is acting horizontally and g=10 m/s2] (Take √3=1.73). Write upto two digits after the decimal point.
Answer» If a rod of mass 0.2 kg is in equilibria in given condition then friction force acting on rod in newtons is. [Force F is acting horizontally and $g = 10 m / s^{2}$ ] (Take $\sqrt{3} = 1.73$ ). Write upto two digits after the decimal point.

Discussion

50.	A photon and electron have same de-Broglie wavelength. Give that is the speed of electron and c is the velocity of light. are the kinetic energy of electron and photon respectively. are the momentum of electron and photon respectively. Then which of the following relation is correct?
Answer» A photon and electron have same de-Broglie wavelength. Give that is the speed of electron and c is the velocity of light. are the kinetic energy of electron and photon respectively. are the momentum of electron and photon respectively. Then which of the following relation is correct?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A coil has a resistance of 10Ω and an inductance of 0.4 henry. It is connected to an AC source of 6.5 V, 30π Hz. Find the average power consumed in the circuit.

Angle of inclination of the water surface from horizontal for the given accelerated container shown in the figure is [Assume g=10 m/s2]

A body is executing simple harmonic motion. At a displacement x, its potential energy is E1 and at a displacement y, its potential energy is E2. The potential energy E at a displacement (x+y) is

In the arrangement shown if figure (42-E4), y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photo current.

Hydrogen (H), deuterium (D), singly ionized helium (He+) and doubly ionized lithium (Li++) all have one electron around the nucleus. Consider n = 2 to n = 1 transition. The wavelengths of emitted radiations are λ1,λ2,λ3 and λ4 respectively. Then approximately

A bus and a car start from rest and run along a straight line with constant acceleration of 2 m/s2 and 3 m/s2 respectively, with the car behind the bus at distance of 100 m. How long in seconds will it take before both the bus and car travel side by side? Answer upto 2 decimal places

Electrode potential for Mg electrode varies according to the equation. EMg2+Mg=E∘Mg2+Mg−0.0592log(1Mg2+) The graph of EMg2+Mgvslog[Mg2+] is

Find net dipole moment of given charge configuration.

The speed of a projectile at the highest point becomes 1√2times its initial speed. The horizontal range of the projectile will be

Find the area of the parallelogram whose adjacent sides are determined by the vectors →a=^i−^j+3^k and →b=2^i−7^j+^k.

When 100 V dc is applied across a solenoid, a current of 1.0 A flows in it. When 100 V ac is applied across the same coil, the current drops to 0.5 A. If the frequency of the ac source is 5o Hz, the impedance and inductance of the solenoid are

Explain how the maximum height of mountain on earth can be estimated from elastic behaviour of earth

If for two vectors →A and →B, sum (→A+→b) is perpendicular to the difference (→A−→B) Find the ratio of the magnitude (AB).

What is the acceleration /time =?

Light is confined within the core of a simple optical fiber by:

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth is

An electron jumps from n = 4 to n = 1 state in H-atom. The recoil momentum of H-atom (in eV/C) is

The above spring block system does Linear SHM. It takes the block 10 sec to move from the mean position to extreme position that is 5m away. Which of the given options are correct?

Polyurethane is quite good for cold weather for jackets and blankets. However, thermal emergency blankets or space blankets are often made up of something similar to aluminum foil and used by astronauts to avoid hypothermia when stuck in subzero temperature. Why do you think it is a good choice?

Let X=¯¯¯¯¯¯¯¯¯¯¯¯ABC+¯¯¯¯¯¯¯¯¯¯¯¯BCA+¯¯¯¯¯¯¯¯¯¯¯¯¯¯CAB. Evaluate X for (a) A=1, B=0, C=1, (b) A=B=C=1, and (c) A=B=C=0.

A point dipole is placed near to a metallic conductor. Find an electric field due to induced charge at point A.

A current of 5.0 A exists in the circuit shown in figure (34 - E3). The wire PQ has a length of 50 cm and the magnetic field in which it is immersed has a magnitude of 0.20 T. Find the magnetic force acting on the wire PQ.

A gun fires 20 bullets/sec each of mass 20 gm, with a muzzle velocity of 50 m/s. Find the force required to hold the gun in position.

Which of the following statement is not correct

A small object is embedded in a glass sphere (μ=1.5) of radius 5.0 cm at a distance 1.5 cm left to the centre. Locate the image of the object as seen by an observer standing (a) To the left of the sphere and (b) To the right of the sphere.

In the Bohr’s model of hydrogen atom, the electrons moves around the nucleus in a circular orbit of a radius 5×10−11 metre. It’s time period is 1.5×10−16 sec. The current associated is

A curve has a radius of 50 m and a banking angle (θ) of 15∘. What is the maximum safe speed for a car on this curve if the road does not offer any friction? Take g=10 m/s2.

A uniform rod of length L and mass m is placed on rough horizontal surface.If coefficient of friction is μ=kx,where k is constant and μ exist for 0≤ x≤ L (i.e for x&gt;L friction is zero.). If rod moves towards the right, magnitude of work done by friction is:

Current is given as i=2√t. RMS value of current between t = 0 to t = 2 sec is

Why does mass get accumulated when a body moves with high speed?

An ant starts crawling from the bottom of a bowl of radius r, having coefficient of friction μ. The maximum vertical height h up to which it can reach is

A charge 4C is placed at the origin, what is the electric potential at a point (3,4,0)?

Starting from rest, a fan takes four seconds to attain the maximum speed of 800 rpm (revolutions per minute). Assuming uniform acceleration, calculate the time taken by the fan in attaining half the maximum speed.

A uniform slender rod of length L, cross sectional area A and Young’s modulus Y is acted upon by the forces shown in the figure. The elongation of the rod is

A current I is passing through a wire having two sections P and Q of uniform diameters d and d2 respectively. If the mean drift velocity of electrons in section P and Q is denoted by vp and vq respectively, then

A particle of mass m is driven by a machine that delivers a constant power of K watts. If the particle starts from rest the force on then particle at time t is :

Two similar rods are joined as shown in figure, then temperature of junction is (assume no heat loss through lateral surface of rod and temperatures at the ends are shown in steady state condition)

The current i in an induction coil varies with time t according to the graph shown in the figure. Which of the following graphs shows the induced EMF in the coil with time?

A capacitor C1=12 μF charged with voltage 4 V is connected across uncharged capacitor C2=4 μF and resistor 2 Ω. At t=0, switch S is closed. At t=t0, voltage across C1 is 3 V, then current in circuit (in A) at t=t0 is (Answer upto two decimal places )

The minimum value of sin(θ)cos(θ) is

The dimensional representation of Planck’s constant is identical to that of

In the following equation x. t and F represent respectively displacement, time and force: F=a+bt+1c+dx+A sin(ωt+ϕ). The dimensional formula for Ad is

If a rod of mass 0.2 kg is in equilibria in given condition then friction force acting on rod in newtons is. [Force F is acting horizontally and g=10 m/s2] (Take √3=1.73). Write upto two digits after the decimal point.

A photon and electron have same de-Broglie wavelength. Give that is the speed of electron and c is the velocity of light. are the kinetic energy of electron and photon respectively. are the momentum of electron and photon respectively. Then which of the following relation is correct?

A uniform rod of length L and mass m is placed on rough horizontal surface.If coefficient of friction is μ=kx,where k is constant and μ exist for 0≤ x≤ L (i.e for x>L friction is zero.). If rod moves towards the right, magnitude of work done by friction is: