50278 + Interview Questions in Physics

1.	A man thinks about 4 arrangements as shown to raise two small bricks each having mass m. Which of the arrangement would take minimum time for the same force applied ?
Answer» A man thinks about 4 arrangements as shown to raise two small bricks each having mass $m$ . Which of the arrangement would take minimum time for the same force applied ?

Discussion

2.	A photocopier is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology in which toner particles are positively charged and then transfer them onto paper in the form of an image/letters. What charge should the paper possess for this process to happen?
Answer» A photocopier is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology in which toner particles are positively charged and then transfer them onto paper in the form of an image/letters. What charge should the paper possess for this process to happen?

2.

A photocopier is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology in which toner particles are positively charged and then transfer them onto paper in the form of an image/letters. What charge should the paper possess for this process to happen?

Answer»

A photocopier is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology in which toner particles are positively charged and then transfer them onto paper in the form of an image/letters.

What charge should the paper possess for this process to happen?

Discussion

3.	A boy whose mass is 30 kg climbs with a constant speed on a vertical rope of 6 m length in 10 s. The power of the boy during the climb is (Take g=10 m/s2)
Answer» A boy whose mass is $30 kg$ climbs with a constant speed on a vertical rope of $6 m$ length in $10 s$ . The power of the boy during the climb is (Take $g = 10 {m/s}^{2})$

Discussion

4.	The equation of particle executing simple harmonic motion x=10 sin(πt+π6) where x,t are in SI units. Find the velocity of the particle at t=1 seconds.
Answer» The equation of particle executing simple harmonic motion $x = 10 sin (π t + \frac{π}{6})$ where $x, t$ are in SI units. Find the velocity of the particle at $t = 1$ seconds.

Discussion

5.	A charged particle is projected with velocity →v=u^i from the origin, in a region having electric field →E and magnetic field →B both. Value of →B and →E are given in column 1 and column 2 respectively and path of the particle is given in column 3. Column 1 Column 2 Column 3 (Magnetic field) (Electric field) (Path of particle)(i)→B=0(i)→E=0(P)Circular path(ii)→B=B0^i+B0^j(ii)→E=E0^i(Q)Helical path(iii)→B=B0^j+B0^k(iii)→E=B0u(^j−^k)(R)Cycloid(iv)→B=B0^k(iv)→E=E0^k(S)Straight line In which of the following combination particle moves with uniform speed?
Answer» A charged particle is projected with velocity $\to v = u^i$ from the origin, in a region having electric field $\to E$ and magnetic field $\to B$ both. Value of $\to B$ and $\to E$ are given in column 1 and column 2 respectively and path of the particle is given in column 3. $\begin{matrix} Column 1 & Column 2 & Column 3 (Magnetic field) & (Electric field) & (Path of particle) (i) & \to B = 0 & (i) & \to E = 0 & (P) & Circular path (i i) & \to B = B_{0}^i + B_{0}^j & (i i) & \to E = E_{0}^i & (Q) & Helical path (i i i) & \to B = B_{0}^j + B_{0}^k & (i i i) & \to E = B_{0} u (^j -^k) & (R) & Cycloid (i v) & \to B = B_{0}^k & (i v) & \to E = E_{0}^k & (S) & Straight line \end{matrix}$ In which of the following combination particle moves with uniform speed?

5.

A charged particle is projected with velocity →v=u^i from the origin, in a region having electric field →E and magnetic field →B both. Value of →B and →E are given in column 1 and column 2 respectively and path of the particle is given in column 3. Column 1 Column 2 Column 3 (Magnetic field) (Electric field) (Path of particle)(i)→B=0(i)→E=0(P)Circular path(ii)→B=B0^i+B0^j(ii)→E=E0^i(Q)Helical path(iii)→B=B0^j+B0^k(iii)→E=B0u(^j−^k)(R)Cycloid(iv)→B=B0^k(iv)→E=E0^k(S)Straight line In which of the following combination particle moves with uniform speed?

Answer»

A charged particle is projected with velocity $\to v = u^i$ from the origin, in a region having electric field $\to E$ and magnetic field $\to B$ both. Value of $\to B$ and $\to E$ are given in column 1 and column 2 respectively and path of the particle is given in column 3.

$\begin{matrix} Column 1 & Column 2 & Column 3 (Magnetic field) & (Electric field) & (Path of particle) (i) & \to B = 0 & (i) & \to E = 0 & (P) & Circular path (i i) & \to B = B_{0}^i + B_{0}^j & (i i) & \to E = E_{0}^i & (Q) & Helical path (i i i) & \to B = B_{0}^j + B_{0}^k & (i i i) & \to E = B_{0} u (^j -^k) & (R) & Cycloid (i v) & \to B = B_{0}^k & (i v) & \to E = E_{0}^k & (S) & Straight line \end{matrix}$

In which of the following combination particle moves with uniform speed?

Discussion

6.	A particle executes SHM of amplitude A and time period T. Find the distance travelled by the particle in the duration its phase changes by π12 to 5π12.
Answer» A particle executes $SHM$ of amplitude $A$ and time period $T$ . Find the distance travelled by the particle in the duration its phase changes by $\frac{π}{12}$ to $\frac{5 π}{12}$ .

Discussion

7.	A uniform electric field pointing in positive x – direction exists in a region. Let A be the origin, B be the point on the x-axis at x=+1 cm and C be the point on the y axis at y=+1 cm. Then the potentials at the points A, B, and C satisfy
Answer» A uniform electric field pointing in positive x – direction exists in a region. Let A be the origin, B be the point on the x-axis at $x = + 1 c m$ and C be the point on the y axis at $y = + 1 c m$ . Then the potentials at the points A, B, and C satisfy

Discussion

8.	Consider a hydrogen atom with its electron in the nth orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc=1242 eV nm)
Answer» Consider a hydrogen atom with its electron in the $n^{t h}$ orbital. An electromagnetic radiation of wavelength $90 n m$ is used to ionize the atom. If the kinetic energy of the ejected electron is $10.4 e V$ , then the value of $n$ is ( $h c = 1242 e V n m$ )

Discussion

9.	A hollow vertical cylinder of radius R, with block M on its inner wall, is rotated with angular velocity ω about an axis through its centre. What is the minimum coefficient of static friction between block M and cylinder wall necessary to keep the block suspended on the inside of the cylinder?
Answer» A hollow vertical cylinder of radius $R$ , with block $M$ on its inner wall, is rotated with angular velocity $ω$ about an axis through its centre. What is the minimum coefficient of static friction between block $M$ and cylinder wall necessary to keep the block suspended on the inside of the cylinder?

Discussion

10.	Assume the gas to be ideal, the work done on the gas in taking it from A to B is
Answer» Assume the gas to be ideal, the work done on the gas in taking it from A to B is

Discussion

11.	Large number of free electrons are present in metals. why is there no current in the absence of electric field across it?
Answer» Large number of free electrons are present in metals. why is there no current in the absence of electric field across it?

Discussion

12.	The power amplification for a common emitter (CE) amplifier is 22110. Its current gain is 67 and internal resistance is 200 ohm. What is the value of the of the output resistance?
Answer» The power amplification for a common emitter (CE) amplifier is 22110. Its current gain is 67 and internal resistance is 200 ohm. What is the value of the of the output resistance?

Discussion

13.	When pressure remains constant, find the temperature at which the volume of a gas at 0∘C will double itself.
Answer» When pressure remains constant, find the temperature at which the volume of a gas at $0^{\circ} C$ will double itself.

Discussion

14.	cot33π4 is equal to
Answer» $cot \frac{33 π}{4}$ is equal to

Discussion

15.	A point moves in a straight line so that its displacement x is given by x2=1+t2 where, x is in m and time t is in s. Its acceleration in m/s2 at time t is
Answer» A point moves in a straight line so that its displacement $x$ is given by $x^{2} = 1 + t^{2}$ where, $x$ is in $m$ and time $t$ is in $s$ . Its acceleration in ${m/s}^{2}$ at time $t$ is

Discussion

16.	Given →A.→B=\|→A×→C\|=0 What is the angle between →B and →C?
Answer» Given $\to A . \to B = \| \to A \times \to C \| = 0$ What is the angle between $\to B a n d \to C$ ?

Discussion

17.	What happens to a white light when it passes through a prism?
Answer» What happens to a white light when it passes through a prism?

Discussion

18.	In making an alloy, a substance of specific gravity s1 and mass m1 is mixed with another substance of specific gravity s2 and mass m2; then the specific gravity of the alloy is
Answer» In making an alloy, a substance of specific gravity $s_{1}$ and mass $m_{1}$ is mixed with another substance of specific gravity $s_{2}$ and mass $m_{2}$ ; then the specific gravity of the alloy is

18.

In making an alloy, a substance of specific gravity s1 and mass m1 is mixed with another substance of specific gravity s2 and mass m2; then the specific gravity of the alloy is

Answer»

In making an alloy, a substance of specific gravity $s_{1}$ and mass $m_{1}$ is mixed with another substance of specific gravity $s_{2}$ and mass $m_{2}$ ; then the specific gravity of the alloy is

Discussion

19.	One light year is approximately equal to
Answer» One light year is approximately equal to

Discussion

20.	An LR circuit with emf ε is connected at t = 0. (a) Find the charge Q which flows through the battery during 0 to t. (b) Calculat the work done by the battery during this period. (c) Find the heat developed during this period . (d) Find the magnetic field energy stored in the circuit at time t. (e) Verify that the results in the three parts above are consistent with energy conservation.
Answer» An LR circuit with emf $ε$ is connected at t = 0. (a) Find the charge Q which flows through the battery during 0 to t. (b) Calculat the work done by the battery during this period. (c) Find the heat developed during this period . (d) Find the magnetic field energy stored in the circuit at time t. (e) Verify that the results in the three parts above are consistent with energy conservation.

Discussion

21.	net force on center of mass is equal to net force on each particle.Relate this with tight rope walking.I can't understand why holding a stick helps us to stay in rope.
Answer» net force on center of mass is equal to net force on each particle.Relate this with tight rope walking.I can't understand why holding a stick helps us to stay in rope.

Discussion

22.	I cannot understand example no. 2.6 in the chapter units and dimensions. The page no. is 25 in Ncert textbook. Can you please explain it to me? The question starts with:- Two clocks are being tested.....
Answer» I cannot understand example no. 2.6 in the chapter units and dimensions. The page no. is 25 in Ncert textbook. Can you please explain it to me? The question starts with:- Two clocks are being tested.....

22.

I cannot understand example no. 2.6 in the chapter units and dimensions. The page no. is 25 in Ncert textbook. Can you please explain it to me? The question starts with:- Two clocks are being tested.....

Answer»

I cannot understand example no. 2.6 in the chapter units and dimensions. The page no. is 25 in Ncert textbook. Can you please explain it to me? The question starts with:-

Two clocks are being tested.....

Discussion

23.	How can you say that electron is a universal constituent all atoms?
Answer» How can you say that electron is a universal constituent all atoms?

Discussion

24.	two blocks of different masses are hanging on two ends of a string passing over a frictionless pulley.the heavier block is twice that of the lighter one. the tension in the string is 60 N. find decrease in PE during the first second after the system is released.
Answer» two blocks of different masses are hanging on two ends of a string passing over a frictionless pulley.the heavier block is twice that of the lighter one. the tension in the string is 60 N. find decrease in PE during the first second after the system is released.

Discussion

25.	A motorcycle's horn is blowing out a 3015 Hz sound as it moves eastward towards a stationary observer. A train sounds its horn at 855 Hz as it heads westward away from that same observer. If the observer hears the train as 850 Hz and the motorcycle's horn as 3060 Hz, what is the speed of the motorcycle relative to the train (in m/s) ? Use 340 m/s as the speed of sound in air.
Answer» A motorcycle's horn is blowing out a $3015 Hz$ sound as it moves eastward towards a stationary observer. A train sounds its horn at $855 Hz$ as it heads westward away from that same observer. If the observer hears the train as $850 Hz$ and the motorcycle's horn as $3060 Hz$ , what is the speed of the motorcycle relative to the train (in $m/s$ ) ? Use $340 m/s$ as the speed of sound in air.

Discussion

26.	The internal resistance of a cell of emf 2V is 0.1Ω. It’s connected to a resistance of 3.9Ω. The voltage across the cell will be
Answer» The internal resistance of a cell of emf 2V is $0.1 Ω$ . It’s connected to a resistance of $3.9 Ω$ . The voltage across the cell will be

Discussion

27.	The angular displacement θ of a fly wheel at the instant t is given by θ = 2t3 - 4 t2 + 8 The angular acceleration of the fly wheel after 2s is
Answer» The angular displacement θ of a fly wheel at the instant t is given by θ = 2t³ - 4 t² + 8 The angular acceleration of the fly wheel after 2s is

27.

The angular displacement θ of a fly wheel at the instant t is given by θ = 2t3 - 4 t2 + 8 The angular acceleration of the fly wheel after 2s is

Answer»

The angular displacement θ of a fly wheel at the instant t is given by

θ = 2t³ - 4 t² + 8

The angular acceleration of the fly wheel after 2s is

Discussion

28.	Out of the given four waves (1), (2), (3) and (4) y=a sin(kx+ωt) ...................(1) y=a sin(ωt−kx) ...................(2) y=a cos(kx+ωt) ...................(3) y=a sin(ωt−kx) ...................(4) emitted by four different sources S1,S2,S3 and S4 respectively, interference phenomena would be observed in space under appropriate conditions when
Answer» Out of the given four waves (1), (2), (3) and (4) $y = a s i n (k x + ω t)$ ...................(1) $y = a s i n (ω t - k x)$ ...................(2) $y = a c o s (k x + ω t)$ ...................(3) $y = a s i n (ω t - k x)$ ...................(4) emitted by four different sources $S_{1}, S_{2}, S_{3} a n d S_{4}$ respectively, interference phenomena would be observed in space under appropriate conditions when

28.

Out of the given four waves (1), (2), (3) and (4) y=a sin(kx+ωt) ...................(1) y=a sin(ωt−kx) ...................(2) y=a cos(kx+ωt) ...................(3) y=a sin(ωt−kx) ...................(4) emitted by four different sources S1,S2,S3 and S4 respectively, interference phenomena would be observed in space under appropriate conditions when

Answer»

Out of the given four waves (1), (2), (3) and (4)

$y = a s i n (k x + ω t)$ ...................(1)

$y = a s i n (ω t - k x)$ ...................(2)

$y = a c o s (k x + ω t)$ ...................(3)

$y = a s i n (ω t - k x)$ ...................(4)

emitted by four different sources $S_{1}, S_{2}, S_{3} a n d S_{4}$ respectively, interference phenomena would be observed in space under appropriate conditions when

Discussion

29.	A ball of mass 0.50 kg moving at a speed of 5.0 ms collides with another ball of mass 1.0 kg .After the collision the balls stick together and remain motionless.What was the velocity of the 1.0 kg block before the collision?
Answer» A ball of mass 0.50 kg moving at a speed of 5.0 $\frac{m}{s}$ collides with another ball of mass 1.0 kg .After the collision the balls stick together and remain motionless.What was the velocity of the 1.0 kg block before the collision?

Discussion

30.	If earth stands still what will be its effect on man’s weight
Answer» If earth stands still what will be its effect on man’s weight

Discussion

31.	Two rods of equal lengths(l) and equal mass M are kept along x and y-axis respectively such that their centre of mass lie at the origin. The moment of inertia about a line y = x is
Answer» Two rods of equal lengths(l) and equal mass M are kept along x and y-axis respectively such that their centre of mass lie at the origin. The moment of inertia about a line y = x is

Discussion

32.	Calculate the torque on the square plate of the previous problem if it rotates about a diagonal with the same angular acceleration.
Answer» Calculate the torque on the square plate of the previous problem if it rotates about a diagonal with the same angular acceleration.

Discussion

33.	Consider the situation shown in figure (8-E8). Initially the spring is unstretched when the system is released form rest. Assuming no friction in the pulley, find the maximum elongation of the spring.
Answer» Consider the situation shown in figure (8-E8). Initially the spring is unstretched when the system is released form rest. Assuming no friction in the pulley, find the maximum elongation of the spring.

33.

Consider the situation shown in figure (8-E8). Initially the spring is unstretched when the system is released form rest. Assuming no friction in the pulley, find the maximum elongation of the spring.

Answer»

Consider the situation shown in figure (8-E8). Initially the spring is unstretched when the system is released form rest. Assuming no friction in the pulley, find the maximum elongation of the spring.

Discussion

34.	A block of mass m moving at a velocity v collides head on with another block of mass 2m at rest. If the coefficient of restitution is 12, find the velocities of the blocks after the collision.
Answer» A block of mass $m$ moving at a velocity $v$ collides head on with another block of mass $2 m$ at rest. If the coefficient of restitution is $\frac{1}{2}$ , find the velocities of the blocks after the collision.

Discussion

35.	A gate has the following truth table P 1 1 0 0 Q 1 0 1 0 R 1 0 0 0 The gate is
Answer» A gate has the following truth table P 1 1 0 0 Q 1 0 1 0 R 1 0 0 0 The gate is

35.

A gate has the following truth table P 1 1 0 0 Q 1 0 1 0 R 1 0 0 0 The gate is

Answer»

A gate has the following truth table

P 1 1 0 0

Q 1 0 1 0

R 1 0 0 0

The gate is

Discussion

36.	An aeroplane moving horizontally with a speed of 720 km/h drops a food pocket, while flying at a height of 396.9 m. the time taken by a food pocket to reach the ground and its horizontal range is (Take g = 9.8 m/sec2)
Answer» An aeroplane moving horizontally with a speed of 720 km/h drops a food pocket, while flying at a height of 396.9 m. the time taken by a food pocket to reach the ground and its horizontal range is (Take g = 9.8 m/ $s e c^{2}$ )

Discussion

37.	In ΔABC with fixed length of BC, the internal bisector of angle C meets the side AB at D and the circumcircle at E. The maximum value of CD×DE is c2k, then value of k is
Answer» In $Δ A B C$ with fixed length of $B C$ , the internal bisector of angle $C$ meets the side $A B$ at $D$ and the circumcircle at $E$ . The maximum value of $C D \times D E$ is $\frac{c^{2}}{k}$ , then value of $k$ is

Discussion

38.	Water is moving with a speed of 5.18 ms−1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm2. The speed of flow at the lower level is
Answer» Water is moving with a speed of 5.18 ms $^{-} 1$ through a pipe with a cross-sectional area of 4.20 $c m^{2}$ . The water gradually descends 9.66 m as the pipe increase in area to 7.60 $c m^{2}$ . The speed of flow at the lower level is

Discussion

39.	A ring of radius 2 m performs combined translational and rotational motion on a frictionless horizontal surface with an angular acceleration 4 rad/s2 and the acceleration of its centre a=4 m/s2 as shown in figure. Find the acceleration of point D.
Answer» A ring of radius $2 m$ performs combined translational and rotational motion on a frictionless horizontal surface with an angular acceleration $4 {rad/s}^{2}$ and the acceleration of its centre $a = 4 {m/s}^{2}$ as shown in figure. Find the acceleration of point $D$ .

Discussion

40.	An unruly demonstrator lifts a stone of mass 200 g from the ground and throws it at his opponent. At the time of projection, the stone is 150 cm above the ground and has a speed of 3.00 m/s. Calculate the work done by the demonstrator during the process. If it takes one second for the demonstrator to lift the stone and throw, what horsepower does he use ?
Answer» An unruly demonstrator lifts a stone of mass 200 g from the ground and throws it at his opponent. At the time of projection, the stone is 150 cm above the ground and has a speed of 3.00 m/s. Calculate the work done by the demonstrator during the process. If it takes one second for the demonstrator to lift the stone and throw, what horsepower does he use ?

Discussion

41.	Two identical cylindrical vessels with their bases at same level each contains a liquid of density ρ. The height of the liquid in one vessel is h1 and that in the other vessel is h2. The area of either base is A. The work done by gravity in equalizing the levels when the two vessels are connected, is
Answer» Two identical cylindrical vessels with their bases at same level each contains a liquid of density ρ. The height of the liquid in one vessel is h₁ and that in the other vessel is $h_{2}$ . The area of either base is A. The work done by gravity in equalizing the levels when the two vessels are connected, is

Discussion

42.	What is relative velocity?
Answer» What is relative velocity?

Discussion

43.	If 2^i+3^j+4^k and ^i−^j+^k are two adjacent sides of a parallelogram, then the area of the parallelogram will be
Answer» If $2^i + 3^j + 4^k$ and $^i -^j +^k$ are two adjacent sides of a parallelogram, then the area of the parallelogram will be

Discussion

44.	Microscope is an optical instrument which
Answer» Microscope is an optical instrument which

Discussion

45.	Two identical capacitors 1 and 2 are connected in series to a battery as shown in the figure. Capacitor 2 contains a dielectric slab of dielectric constant slab of dielectric constant K as shown. Q1 and Q2 are the charges stored in the capacitors. Now the dielectric slab is removed and the corresponding charges are then:
Answer» Two identical capacitors 1 and 2 are connected in series to a battery as shown in the figure. Capacitor 2 contains a dielectric slab of dielectric constant slab of dielectric constant K as shown. Q₁ and Q₂ are the charges stored in the capacitors. Now the dielectric slab is removed and the corresponding charges are then:

45.

Two identical capacitors 1 and 2 are connected in series to a battery as shown in the figure. Capacitor 2 contains a dielectric slab of dielectric constant slab of dielectric constant K as shown. Q1 and Q2 are the charges stored in the capacitors. Now the dielectric slab is removed and the corresponding charges are then:

Answer»

Two identical capacitors 1 and 2 are connected in series to a battery as shown in the figure. Capacitor 2 contains a dielectric slab of dielectric constant slab of dielectric constant K as shown. Q₁ and Q₂ are the charges stored in the capacitors. Now the dielectric slab is removed and the corresponding charges are then:

Discussion

46.	A ball is dropped from a height of 20 meters and at the same time another ball is thrown up from the ground with the speed of 20 m/s. When and where will the balls meet?
Answer» A ball is dropped from a height of 20 meters and at the same time another ball is thrown up from the ground with the speed of 20 m/s. When and where will the balls meet?

Discussion

47.	A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.
Answer» A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

47.

A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

Answer»

A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

Discussion

48.	Distance of the centre of mass of a solid uniform cone from its vertex is Z0. If the radius of its base is R and its heights is h, then Z0 is equal to ?
Answer» Distance of the centre of mass of a solid uniform cone from its vertex is $Z_{0}$ . If the radius of its base is R and its heights is h, then $Z_{0}$ is equal to ?

Discussion

49.	A wheel of radius 30 cm has 8 spokes in it. It is mounted on a fixed axle and spins at 5 rev/s. If an arrow of length 24 cm is to be shot parallel to the axis of the wheel without hitting rim or the spokes of the wheel. What minimum speed the arrow must have? (Ignore the effect of gravity)
Answer» A wheel of radius $30 c m$ has $8$ spokes in it. It is mounted on a fixed axle and spins at $5 r e v / s$ . If an arrow of length $24 c m$ is to be shot parallel to the axis of the wheel without hitting rim or the spokes of the wheel. What minimum speed the arrow must have? (Ignore the effect of gravity)

Discussion

50.	A smooth piston of mass m and cross - section area A is in equilibrium on a diatomic gas filled in a cylindrical container and there is vaccum above the piston. The piston and container are non - conducting and the height of gas column in the container is l0 at equilibrium. If the piston is displaced slightly down the equilibrium position, then the time period of its oscillation will be:
Answer» A smooth piston of mass $m$ and cross - section area $A$ is in equilibrium on a diatomic gas filled in a cylindrical container and there is vaccum above the piston. The piston and container are non - conducting and the height of gas column in the container is $l_{0}$ at equilibrium. If the piston is displaced slightly down the equilibrium position, then the time period of its oscillation will be:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A man thinks about 4 arrangements as shown to raise two small bricks each having mass m. Which of the arrangement would take minimum time for the same force applied ?

A boy whose mass is 30 kg climbs with a constant speed on a vertical rope of 6 m length in 10 s. The power of the boy during the climb is (Take g=10 m/s2)

The equation of particle executing simple harmonic motion x=10 sin(πt+π6) where x,t are in SI units. Find the velocity of the particle at t=1 seconds.

A particle executes SHM of amplitude A and time period T. Find the distance travelled by the particle in the duration its phase changes by π12 to 5π12.

A uniform electric field pointing in positive x – direction exists in a region. Let A be the origin, B be the point on the x-axis at x=+1 cm and C be the point on the y axis at y=+1 cm. Then the potentials at the points A, B, and C satisfy

Consider a hydrogen atom with its electron in the nth orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc=1242 eV nm)

A hollow vertical cylinder of radius R, with block M on its inner wall, is rotated with angular velocity ω about an axis through its centre. What is the minimum coefficient of static friction between block M and cylinder wall necessary to keep the block suspended on the inside of the cylinder?

Assume the gas to be ideal, the work done on the gas in taking it from A to B is

Large number of free electrons are present in metals. why is there no current in the absence of electric field across it?

The power amplification for a common emitter (CE) amplifier is 22110. Its current gain is 67 and internal resistance is 200 ohm. What is the value of the of the output resistance?

When pressure remains constant, find the temperature at which the volume of a gas at 0∘C will double itself.

cot33π4 is equal to

A point moves in a straight line so that its displacement x is given by x2=1+t2 where, x is in m and time t is in s. Its acceleration in m/s2 at time t is

Given →A.→B=|→A×→C|=0 What is the angle between →B and →C?

What happens to a white light when it passes through a prism?

In making an alloy, a substance of specific gravity s1 and mass m1 is mixed with another substance of specific gravity s2 and mass m2; then the specific gravity of the alloy is

One light year is approximately equal to

net force on center of mass is equal to net force on each particle.Relate this with tight rope walking.I can't understand why holding a stick helps us to stay in rope.

I cannot understand example no. 2.6 in the chapter units and dimensions. The page no. is 25 in Ncert textbook. Can you please explain it to me? The question starts with:- Two clocks are being tested.....

How can you say that electron is a universal constituent all atoms?

two blocks of different masses are hanging on two ends of a string passing over a frictionless pulley.the heavier block is twice that of the lighter one. the tension in the string is 60 N. find decrease in PE during the first second after the system is released.

The internal resistance of a cell of emf 2V is 0.1Ω. It’s connected to a resistance of 3.9Ω. The voltage across the cell will be

The angular displacement θ of a fly wheel at the instant t is given by θ = 2t3 - 4 t2 + 8 The angular acceleration of the fly wheel after 2s is

A ball of mass 0.50 kg moving at a speed of 5.0 ms collides with another ball of mass 1.0 kg .After the collision the balls stick together and remain motionless.What was the velocity of the 1.0 kg block before the collision?

If earth stands still what will be its effect on man’s weight

Two rods of equal lengths(l) and equal mass M are kept along x and y-axis respectively such that their centre of mass lie at the origin. The moment of inertia about a line y = x is

Calculate the torque on the square plate of the previous problem if it rotates about a diagonal with the same angular acceleration.

Consider the situation shown in figure (8-E8). Initially the spring is unstretched when the system is released form rest. Assuming no friction in the pulley, find the maximum elongation of the spring.

A block of mass m moving at a velocity v collides head on with another block of mass 2m at rest. If the coefficient of restitution is 12, find the velocities of the blocks after the collision.

A gate has the following truth table P 1 1 0 0 Q 1 0 1 0 R 1 0 0 0 The gate is

An aeroplane moving horizontally with a speed of 720 km/h drops a food pocket, while flying at a height of 396.9 m. the time taken by a food pocket to reach the ground and its horizontal range is (Take g = 9.8 m/sec2)

In ΔABC with fixed length of BC, the internal bisector of angle C meets the side AB at D and the circumcircle at E. The maximum value of CD×DE is c2k, then value of k is

Water is moving with a speed of 5.18 ms−1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm2. The speed of flow at the lower level is

A ring of radius 2 m performs combined translational and rotational motion on a frictionless horizontal surface with an angular acceleration 4 rad/s2 and the acceleration of its centre a=4 m/s2 as shown in figure. Find the acceleration of point D.

What is relative velocity?

If 2^i+3^j+4^k and ^i−^j+^k are two adjacent sides of a parallelogram, then the area of the parallelogram will be

Microscope is an optical instrument which

A ball is dropped from a height of 20 meters and at the same time another ball is thrown up from the ground with the speed of 20 m/s. When and where will the balls meet?

A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

Distance of the centre of mass of a solid uniform cone from its vertex is Z0. If the radius of its base is R and its heights is h, then Z0 is equal to ?

A wheel of radius 30 cm has 8 spokes in it. It is mounted on a fixed axle and spins at 5 rev/s. If an arrow of length 24 cm is to be shot parallel to the axis of the wheel without hitting rim or the spokes of the wheel. What minimum speed the arrow must have? (Ignore the effect of gravity)