50278 + Interview Questions in Physics

1.	When a 5 V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5×10−4 ms−1. If the electron density in the wire is 8×1028 m−3, the resistivity of the material is close to:
Answer» When a 5 $V$ potential difference is applied across a wire of length $0.1 m$ , the drift speed of electrons is $2.5 \times 10^{- 4} m s^{- 1}$ . If the electron density in the wire is $8 \times 10^{28} m^{- 3}$ , the resistivity of the material is close to:

Discussion

2.	The volume V of a monoatomic gas varies with its temperature T as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state 'A' to state 'B' is
Answer» The volume $V$ of a monoatomic gas varies with its temperature $T$ as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state 'A' to state 'B' is

Discussion

3.	The range of a projectile for a given initial velocity is maximum when the angle of projection is 45∘. The range will be minimum, if the angle of projection is
Answer» The range of a projectile for a given initial velocity is maximum when the angle of projection is $45^{\circ}$ . The range will be minimum, if the angle of projection is

Discussion

4.	What are the important derivations in unit and dimension, calculus ,motion in One dimension, vectors, motion in two dimension, circular kinematics?
Answer» What are the important derivations in unit and dimension, calculus ,motion in One dimension, vectors, motion in two dimension, circular kinematics?

Discussion

5.	A rod of mass m and length L is hinged aboutits one of the ends. The rod is released fromhorizontal position, the acceleration of lowestpoint of the rod when the rod becomes verticalis5g(2)2(1) 3g4g(4)37g(3)3
Answer» A rod of mass m and length L is hinged aboutits one of the ends. The rod is released fromhorizontal position, the acceleration of lowestpoint of the rod when the rod becomes verticalis5g(2)2(1) 3g4g(4)37g(3)3

Discussion

6.	A particle is launched from a horizontal plane with speed 10 m/s and angle of projection 60∘. The angular velocity of the particle as observed from the point of projection at the time of landing will be:
Answer» A particle is launched from a horizontal plane with speed $10 m/s$ and angle of projection $60^{\circ}$ . The angular velocity of the particle as observed from the point of projection at the time of landing will be:

Discussion

7.	If force is a vector queantity so why in work we only use the magnitude of force but not the direction?
Answer» If force is a vector queantity so why in work we only use the magnitude of force but not the direction?

Discussion

8.	A truck has to carry a load in the shortest time from one station to another station situated at a distance L from the first. It can start up or slowdown at the same acceleration or deceleration a. What maximum velocity must the truck attain to satisfy this condition?
Answer» A truck has to carry a load in the shortest time from one station to another station situated at a distance $L$ from the first. It can start up or slowdown at the same acceleration or deceleration $a$ . What maximum velocity must the truck attain to satisfy this condition?

Discussion

9.	How does Protons or Electron is counted in an atom by scientists?
Answer» How does Protons or Electron is counted in an atom by scientists?

Discussion

10.	Write the symmetry associated with an isolated charge & an electric dipole.Estimate the electric field intensity at a point on the axis of a uniformly charged +q ring of radius r .Two identical -q Dipole are shown . E= 10 i N/ C Calculate Torque experienced by dipoles . +q
Answer» Write the symmetry associated with an isolated charge & an electric dipole. Estimate the electric field intensity at a point on the axis of a uniformly charged +q ring of radius r . Two identical -q Dipole are shown . E= 10 i N/ C Calculate Torque experienced by dipoles . +q

Discussion

11.	If a simple harmonic motion is represented by d2xdt2+αx=0 its time period is
Answer» If a simple harmonic motion is represented by $\frac{d^{2} x}{d t^{2}} + α x = 0$ its time period is

Discussion

12.	In a potentiometer wire experiment, the emf of a battery in the primary circuit is 20 Volt and its internal resistance is 5 Ω. There is a resistance box (in series with the battery and the potentiometer wire) whose resistance can be varied from 120 Ω to 170 Ω. Resistance of the potentiometer wire is 75 Ω. The following potential difference can not be measured using this potentiometer
Answer» In a potentiometer wire experiment, the emf of a battery in the primary circuit is $20$ Volt and its internal resistance is $5 Ω$ . There is a resistance box (in series with the battery and the potentiometer wire) whose resistance can be varied from $120 Ω$ to $170 Ω$ . Resistance of the potentiometer wire is $75 Ω$ . The following potential difference can not be measured using this potentiometer

Discussion

13.	A soap film of thickness 0.0011 mm appears dark when seen by the reflected light of wavelength 580 nm . What is the index of refraction of the soap solution, if it is known to be between 1.2 and 1.5 ?
Answer» A soap film of thickness 0.0011 mm appears dark when seen by the reflected light of wavelength 580 nm . What is the index of refraction of the soap solution, if it is known to be between 1.2 and 1.5 ?

Discussion

14.	A small metallic sphere of mass m is suspended from the ceiling of a car accelerating on a horizontal road with constant acceleration a as shown in the figure. The tension in the string attached with the metallic sphere is
Answer» A small metallic sphere of mass $m$ is suspended from the ceiling of a car accelerating on a horizontal road with constant acceleration $a$ as shown in the figure. The tension in the string attached with the metallic sphere is

Discussion

15.	An organ pipe A with both ends open, has a fundamental frequency of 300 Hz. The third harmonic of organ pipe B with one end open, has the same frequency as the second harmonic of pipe A. What is the ratio of length of pipe A to length of pipe B ?
Answer» An organ pipe $A$ with both ends open, has a fundamental frequency of $300 Hz$ . The third harmonic of organ pipe $B$ with one end open, has the same frequency as the second harmonic of pipe $A$ . What is the ratio of length of pipe $A$ to length of pipe $B$ ?

Discussion

16.	An audio signal vm=20sin2π(1500t) amplitude modulates a carrier vc=80sin2π(100,000t). The value of percent modulation is
Answer» An audio signal $v_{m} = 20 sin 2 π (1500 t)$ amplitude modulates a carrier $v_{c} = 80 sin 2 π (100, 000 t)$ . The value of percent modulation is

Discussion

17.	THE KINETIC ENERGY OF AN ELECTRON WHICH IS ASSOCIATED WITH DE - BROGLIE'S WAVELENGH 20 ANGSTROM IS
Answer» THE KINETIC ENERGY OF AN ELECTRON WHICH IS ASSOCIATED WITH DE - BROGLIE'S WAVELENGH 20 ANGSTROM IS

Discussion

18.	17. Three forces F1= (2i +4j) N; F2 =(2j -k)Nand F3= (k-4i-2^j )Nare applied on an object of mass 1 kg at rest at origin. The position of the object at t =2s will be:(1) (-2 m, -6 m)(2) (-4 m, 8 m)(3) (3 m, 6 m)(4) (2 m, -3 m)
Answer» 17. Three forces F1= (2i +4j) N; F2 =(2j -k)Nand F3= (k-4i-2 $^j$ )Nare applied on an object of mass 1 kg at rest at origin. The position of the object at t =2s will be: (1) (-2 m, -6 m) (2) (-4 m, 8 m) (3) (3 m, 6 m) (4) (2 m, -3 m)

18.

17. Three forces F1= (2i +4j) N; F2 =(2j -k)Nand F3= (k-4i-2^j )Nare applied on an object of mass 1 kg at rest at origin. The position of the object at t =2s will be:(1) (-2 m, -6 m)(2) (-4 m, 8 m)(3) (3 m, 6 m)(4) (2 m, -3 m)

Answer»

17. Three forces F1= (2i +4j) N; F2 =(2j -k)Nand F3= (k-4i-2 $^j$ )Nare applied on an object

of mass 1 kg at rest at origin. The position of the object at t =2s will be:

(1) (-2 m, -6 m)

(2) (-4 m, 8 m)

(3) (3 m, 6 m)

(4) (2 m, -3 m)

Discussion

19.	What is the minimum resistance which can be made using five resistors each of 15 Ω?
Answer» What is the minimum resistance which can be made using five resistors each of $\frac{1}{5} Ω$ ?

Discussion

20.	What is the value of linear velocity, if →ω = 3^i − 4^j + ^k and →r = 5^i − 6^j + 6^k?
Answer» What is the value of linear velocity, if $\to ω$ = $3^i - 4^j +^k$ and $\to r$ = $5^i - 6^j + 6^k$ ?

Discussion

21.	A particle executes simple harmonic oscillation. Its amplitude is a. The period of oscillation is T. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is
Answer» A particle executes simple harmonic oscillation. Its amplitude is $a$ . The period of oscillation is $T$ . The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is

Discussion

22.	In simple pendulum at lowest point tangential acceleration is zero. Why?
Answer» In simple pendulum at lowest point tangential acceleration is zero. Why?

Discussion

23.	A point moves in a straight line so that its displacement x metre at a time t second is such that t =(x2-1)1/2 .Its acceleration in m/s2 at time t second is 1/x 1/x3 -t/x2 t/x2
Answer» A point moves in a straight line so that its displacement x metre at a time t second is such that t =(x²-1)^{1/2 .}Its acceleration in m/s²at time t second is 1/x 1/x³ -t/x² t/x²

23.

A point moves in a straight line so that its displacement x metre at a time t second is such that t =(x2-1)1/2 .Its acceleration in m/s2 at time t second is 1/x 1/x3 -t/x2 t/x2

Answer»

A point moves in a straight line so that its displacement x metre at a time t second is such that t =(x²-1)^{1/2 .}Its acceleration in m/s²at time t second is

1/x

1/x³

-t/x²

t/x²

Discussion

24.	29.Two capacitors C1 and C2 of unknown capacitance are connected first in series and then in parallel across a battery of 100V. If the energy stored in the 2 combinations is 0.045J and 0.25J respectively, determine the values of C1 and C2. Also determine the charge on each capacitors in parallel combination
Answer» 29.Two capacitors C1 and C2 of unknown capacitance are connected first in series and then in parallel across a battery of 100V. If the energy stored in the 2 combinations is 0.045J and 0.25J respectively, determine the values of C1 and C2. Also determine the charge on each capacitors in parallel combination

Discussion

25.	When a body is thrown vertically upwards from bottom of the building, its potential energy changes with height as(take the bottom of the building as reference point)
Answer» When a body is thrown vertically upwards from bottom of the building, its potential energy changes with height as (take the bottom of the building as reference point)

Discussion

26.	A wooden stick of length 30 cm is rotated about an end with a constant angular velocity of 5 rad/s in a uniform magnetic field of magnitude 0.4 T perpendicular to the plane of the motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is :
Answer» A wooden stick of length $30 cm$ is rotated about an end with a constant angular velocity of $5 rad/s$ in a uniform magnetic field of magnitude $0.4 T$ perpendicular to the plane of the motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is :

Discussion

27.	A uniform solid brass sphere is rotating with angular speed ω0 about a diameter. If its temperature is now increased by 100∘C. What will be its new angular speed. (Given αB=2.0×10−5per∘C)
Answer» A uniform solid brass sphere is rotating with angular speed $ω_{0}$ about a diameter. If its temperature is now increased by $100^{\circ} C$ . What will be its new angular speed. (Given $α_{B} = 2.0 \times 10^{- 5} {p e r}^{\circ} C$ )

Discussion

28.	A metal ball suspended from a thread is placed between the plates of a capacito. How will the oscillation of this pendulum change if the ball and plates of the capacitor is charged
Answer» A metal ball suspended from a thread is placed between the plates of a capacito. How will the oscillation of this pendulum change if the ball and plates of the capacitor is charged

Discussion

29.	Among all the parallelograms whose diagonals are 10 and 4, the one having maximum area has its perimeter lying in the interval
Answer» Among all the parallelograms whose diagonals are $10$ and $4$ , the one having maximum area has its perimeter lying in the interval

Discussion

30.	For two moles of gas proove Cp - Cv = R
Answer» For two moles of gas proove Cp - Cv = R

Discussion

31.	Terminal velocity of Mars rover depends uponP = gas density of atmosphere of mars A = frontal area W = weight of falling objectWhat may be the possible relation between terminal velocity v and given quantity.
Answer» Terminal velocity of Mars rover depends upon P = gas density of atmosphere of mars A = frontal area W = weight of falling object What may be the possible relation between terminal velocity $v$ and given quantity.

Discussion

32.	In the disintegration series In the disintegration series 23892Uα→Xβ−−→ AZY The values of Z and A respectively will be
Answer» In the disintegration series In the disintegration series $_{92}^{238} U α \to X β^{-} - \to_{Z}^{A} Y$ The values of Z and A respectively will be

Discussion

33.	The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph
Answer» The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph

33.

The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph

Answer»

The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph

Discussion

34.	The magnetic field at a point inside a 2 mH inductor coil becomes 0.8 of its maximum value in 20 μs when the inductor is joined to a battery. Find the resistance of the circuit.[Take ln(0.2)=−1.609]
Answer» The magnetic field at a point inside a $2 mH$ inductor coil becomes $0.8$ of its maximum value in $20 μ s$ when the inductor is joined to a battery. Find the resistance of the circuit. [Take $ln (0.2) = - 1.609$ ]

Discussion

35.	In an AC circuit, V and I are given by, V=100sin(100t)volt, I=100 sin(100t+π3)A. Then the power dissipated in the circuit is
Answer» In an AC circuit, V and I are given by, V=100sin(100t)volt, $I = 100 s i n (100 t + \frac{π}{3}) A$ . Then the power dissipated in the circuit is

Discussion

36.	Choose the correct alternative:(a) Acceleration due to gravity increases/decreases with increasing altitude.(b) Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density).(c) Acceleration due to gravity is independent of mass of the earth/mass of the body.(d) The formula –G Mm(1/r2– 1/r1) is more/less accurate than the formula mg(r2– r1) for the difference of potential energy between two points r2and r1distance away from the centre of the earth.
Answer» Choose the correct alternative: (a) Acceleration due to gravity increases/decreases with increasing altitude. (b) Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density). (c) Acceleration due to gravity is independent of mass of the earth/mass of the body. (d) The formula –G Mm(1/r₂– 1/r₁) is more/less accurate than the formula mg(r₂– r₁) for the difference of potential energy between two points r₂and r₁distance away from the centre of the earth.

36.

Choose the correct alternative:(a) Acceleration due to gravity increases/decreases with increasing altitude.(b) Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density).(c) Acceleration due to gravity is independent of mass of the earth/mass of the body.(d) The formula –G Mm(1/r2– 1/r1) is more/less accurate than the formula mg(r2– r1) for the difference of potential energy between two points r2and r1distance away from the centre of the earth.

Answer»

Choose the correct alternative:

(a) Acceleration due to gravity increases/decreases with increasing altitude.

(b) Acceleration due to gravity increases/decreases with increasing depth. (assume the earth to be a sphere of uniform density).

(c) Acceleration due to gravity is independent of mass of the earth/mass of the body.

(d) The formula –G Mm(1/r₂– 1/r₁) is more/less accurate than the formula mg(r₂– r₁) for the difference of potential energy between two points r₂and r₁distance away from the centre of the earth.

Discussion

37.	How many NAND gates are used to form an AND gate
Answer» How many NAND gates are used to form an AND gate

Discussion

38.	In an experiment 4 g of M2Ox oxide was reduced to 2.8 g of the metal. If the atomic mass of the metalis 56 g mol-1, the number of O atoms in the oxide is
Answer» In an experiment 4 g of M2Ox oxide was reduced to 2.8 g of the metal. If the atomic mass of the metalis 56 g mol-1, the number of O atoms in the oxide is

Discussion

39.	4 dipoles having charge + and - e are placed inside a sphere. Find the total flux of E coming out of the sphere.
Answer» 4 dipoles having charge + and - e are placed inside a sphere. Find the total flux of E coming out of the sphere.

Discussion

40.	The electric field at the center of a uniformly charged hemispherical shell is E0. Now two portions of the hemisphere are cut from either side and remaining portion is shown in the figure. If α=β=π3 and electric field intensity at centre due to remaining portion is E0x, then x is (answer upto two decimal places)
Answer» The electric field at the center of a uniformly charged hemispherical shell is $E_{0}$ . Now two portions of the hemisphere are cut from either side and remaining portion is shown in the figure. If $α = β = \frac{π}{3}$ and electric field intensity at centre due to remaining portion is $\frac{E_{0}}{x}$ , then $x$ is (answer upto two decimal places)

Discussion

41.	9. How to prove equation of trajectory of projectile motion
Answer» 9. How to prove equation of trajectory of projectile motion

Discussion

42.	A cylindrical vessel, whose diameter and height both are equal to 30 cm, is placed on a horizontal surface and a small particle P is placed in it at a distance of 5.0 cm from the centre. An eye is placed at a position such that the edge of the bottom is just visible (see Figure). The particle P is in the plane of drawing. Up to what minimum height should water be poured in the vessel to make the particle P visible ?
Answer» A cylindrical vessel, whose diameter and height both are equal to 30 cm, is placed on a horizontal surface and a small particle P is placed in it at a distance of 5.0 cm from the centre. An eye is placed at a position such that the edge of the bottom is just visible (see Figure). The particle P is in the plane of drawing. Up to what minimum height should water be poured in the vessel to make the particle P visible ?

42.

A cylindrical vessel, whose diameter and height both are equal to 30 cm, is placed on a horizontal surface and a small particle P is placed in it at a distance of 5.0 cm from the centre. An eye is placed at a position such that the edge of the bottom is just visible (see Figure). The particle P is in the plane of drawing. Up to what minimum height should water be poured in the vessel to make the particle P visible ?

Answer»

A cylindrical vessel, whose diameter and height both are equal to 30 cm, is placed on a horizontal surface and a small particle P is placed in it at a distance of 5.0 cm from the centre. An eye is placed at a position such that the edge of the bottom is just visible (see Figure). The particle P is in the plane of drawing. Up to what minimum height should water be poured in the vessel to make the particle P visible ?

Discussion

43.	A particle of mass m is projected from the ground with an initial speed u0 at an angle α with the horixontal. At the highest point of its trajectory, it makes a completely inelastic collision with another identical particle, which was thrown vertically upward from the ground with the same initial speed u0. The angle that the composite system makes with the horizontal immediately after the collision is
Answer» A particle of mass m is projected from the ground with an initial speed $u_{0}$ at an angle $α$ with the horixontal. At the highest point of its trajectory, it makes a completely inelastic collision with another identical particle, which was thrown vertically upward from the ground with the same initial speed $u_{0}$ . The angle that the composite system makes with the horizontal immediately after the collision is

Discussion

44.	A rocket with a lift-off mass 3.5×104 kg is blasted upwards with an initial acceleration of 10m/s2. Then the initial thrust of the blast is
Answer» A rocket with a lift-off mass $3.5 \times 10^{4} k g$ is blasted upwards with an initial acceleration of $10 m / s^{2}$ . Then the initial thrust of the blast is

Discussion

45.	A rod of length 3 m is kept parallel to a long wire carrying constant current 0.5 A. It is moving away from the wire with a velocity of 10 m/s. Find the induced emf in the rod when its distance from the long wire is 0.15 m.
Answer» A rod of length $3 m$ is kept parallel to a long wire carrying constant current $0.5 A .$ It is moving away from the wire with a velocity of $10 m/s .$ Find the induced emf in the rod when its distance from the long wire is $0.15 m .$

Discussion

46.	One mole of an ideal monoatomic gas undergoes a cyclic process 'abca' as shown in figure. If U denotes the internal energy and W the work done by the gas. Then choose the incorrect altenative (s)
Answer» One mole of an ideal monoatomic gas undergoes a cyclic process 'abca' as shown in figure. If $U$ denotes the internal energy and $W$ the work done by the gas. Then choose the incorrect altenative (s)

Discussion

47.	Kinetic energy of a comet moving in space is given by k=αms2 (where m is the mass of comet, and s is the distance travelled by comet. Determine dimensions of α.
Answer» Kinetic energy of a comet moving in space is given by $k = \frac{α m}{s^{2}}$ (where m is the mass of comet, and s is the distance travelled by comet. Determine dimensions of $α .$

Discussion

48.	Question 1A bucket made of plastic does not rust like a bucket made of iron. Why?
Answer» Question 1 A bucket made of plastic does not rust like a bucket made of iron. Why?

48.

Question 1A bucket made of plastic does not rust like a bucket made of iron. Why?

Answer»

Question 1

A bucket made of plastic does not rust like a bucket made of iron. Why?

Discussion

49.	A resistance of 300Ω and an inductance of 1π henry are connected in series to a ac voltage of 20 volts and 200 Hz frequency. The phase angle between the voltage and current is
Answer» A resistance of $300 Ω$ and an inductance of $\frac{1}{π}$ henry are connected in series to a ac voltage of 20 volts and 200 Hz frequency. The phase angle between the voltage and current is

Discussion

50.	In figure, wires P1Q1 & P2Q2 both are moving towards right with speed 5 cm/s. Resistance of each wire is 2 Ω. Then current through 19 Ω resistor is : (B=1 T)
Answer» In figure, wires $P_{1} Q_{1}$ & $P_{2} Q_{2}$ both are moving towards right with speed $5 cm/s$ . Resistance of each wire is $2 Ω$ . Then current through $19 Ω$ resistor is : $(B = 1 T)$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

When a 5 V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5×10−4 ms−1. If the electron density in the wire is 8×1028 m−3, the resistivity of the material is close to:

The volume V of a monoatomic gas varies with its temperature T as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state 'A' to state 'B' is

The range of a projectile for a given initial velocity is maximum when the angle of projection is 45∘. The range will be minimum, if the angle of projection is

What are the important derivations in unit and dimension, calculus ,motion in One dimension, vectors, motion in two dimension, circular kinematics?

A rod of mass m and length L is hinged aboutits one of the ends. The rod is released fromhorizontal position, the acceleration of lowestpoint of the rod when the rod becomes verticalis5g(2)2(1) 3g4g(4)37g(3)3

A particle is launched from a horizontal plane with speed 10 m/s and angle of projection 60∘. The angular velocity of the particle as observed from the point of projection at the time of landing will be:

If force is a vector queantity so why in work we only use the magnitude of force but not the direction?

A truck has to carry a load in the shortest time from one station to another station situated at a distance L from the first. It can start up or slowdown at the same acceleration or deceleration a. What maximum velocity must the truck attain to satisfy this condition?

How does Protons or Electron is counted in an atom by scientists?

Write the symmetry associated with an isolated charge & an electric dipole.Estimate the electric field intensity at a point on the axis of a uniformly charged +q ring of radius r .Two identical -q Dipole are shown . E= 10 i N/ C Calculate Torque experienced by dipoles . +q

If a simple harmonic motion is represented by d2xdt2+αx=0 its time period is

A soap film of thickness 0.0011 mm appears dark when seen by the reflected light of wavelength 580 nm . What is the index of refraction of the soap solution, if it is known to be between 1.2 and 1.5 ?

A small metallic sphere of mass m is suspended from the ceiling of a car accelerating on a horizontal road with constant acceleration a as shown in the figure. The tension in the string attached with the metallic sphere is

An organ pipe A with both ends open, has a fundamental frequency of 300 Hz. The third harmonic of organ pipe B with one end open, has the same frequency as the second harmonic of pipe A. What is the ratio of length of pipe A to length of pipe B ?

An audio signal vm=20sin2π(1500t) amplitude modulates a carrier vc=80sin2π(100,000t). The value of percent modulation is

THE KINETIC ENERGY OF AN ELECTRON WHICH IS ASSOCIATED WITH DE - BROGLIE'S WAVELENGH 20 ANGSTROM IS

17. Three forces F1= (2i +4j) N; F2 =(2j -k)Nand F3= (k-4i-2^j )Nare applied on an object of mass 1 kg at rest at origin. The position of the object at t =2s will be:(1) (-2 m, -6 m)(2) (-4 m, 8 m)(3) (3 m, 6 m)(4) (2 m, -3 m)

What is the minimum resistance which can be made using five resistors each of 15 Ω?

What is the value of linear velocity, if →ω = 3^i − 4^j + ^k and →r = 5^i − 6^j + 6^k?

A particle executes simple harmonic oscillation. Its amplitude is a. The period of oscillation is T. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is

In simple pendulum at lowest point tangential acceleration is zero. Why?

A point moves in a straight line so that its displacement x metre at a time t second is such that t =(x2-1)1/2 .Its acceleration in m/s2 at time t second is 1/x 1/x3 -t/x2 t/x2

When a body is thrown vertically upwards from bottom of the building, its potential energy changes with height as(take the bottom of the building as reference point)

A uniform solid brass sphere is rotating with angular speed ω0 about a diameter. If its temperature is now increased by 100∘C. What will be its new angular speed. (Given αB=2.0×10−5per∘C)

A metal ball suspended from a thread is placed between the plates of a capacito. How will the oscillation of this pendulum change if the ball and plates of the capacitor is charged

Among all the parallelograms whose diagonals are 10 and 4, the one having maximum area has its perimeter lying in the interval

For two moles of gas proove Cp - Cv = R

Terminal velocity of Mars rover depends uponP = gas density of atmosphere of mars A = frontal area W = weight of falling objectWhat may be the possible relation between terminal velocity v and given quantity.

In the disintegration series In the disintegration series 23892Uα→Xβ−−→ AZY The values of Z and A respectively will be

The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph

The magnetic field at a point inside a 2 mH inductor coil becomes 0.8 of its maximum value in 20 μs when the inductor is joined to a battery. Find the resistance of the circuit.[Take ln(0.2)=−1.609]

In an AC circuit, V and I are given by, V=100sin(100t)volt, I=100 sin(100t+π3)A. Then the power dissipated in the circuit is

How many NAND gates are used to form an AND gate

In an experiment 4 g of M2Ox oxide was reduced to 2.8 g of the metal. If the atomic mass of the metalis 56 g mol-1, the number of O atoms in the oxide is

4 dipoles having charge + and - e are placed inside a sphere. Find the total flux of E coming out of the sphere.

9. How to prove equation of trajectory of projectile motion

A rocket with a lift-off mass 3.5×104 kg is blasted upwards with an initial acceleration of 10m/s2. Then the initial thrust of the blast is

A rod of length 3 m is kept parallel to a long wire carrying constant current 0.5 A. It is moving away from the wire with a velocity of 10 m/s. Find the induced emf in the rod when its distance from the long wire is 0.15 m.

One mole of an ideal monoatomic gas undergoes a cyclic process 'abca' as shown in figure. If U denotes the internal energy and W the work done by the gas. Then choose the incorrect altenative (s)

Kinetic energy of a comet moving in space is given by k=αms2 (where m is the mass of comet, and s is the distance travelled by comet. Determine dimensions of α.

Question 1A bucket made of plastic does not rust like a bucket made of iron. Why?

A resistance of 300Ω and an inductance of 1π henry are connected in series to a ac voltage of 20 volts and 200 Hz frequency. The phase angle between the voltage and current is

In figure, wires P1Q1 &amp; P2Q2 both are moving towards right with speed 5 cm/s. Resistance of each wire is 2 Ω. Then current through 19 Ω resistor is : (B=1 T)

In figure, wires P1Q1 & P2Q2 both are moving towards right with speed 5 cm/s. Resistance of each wire is 2 Ω. Then current through 19 Ω resistor is : (B=1 T)