3731 + Interview Questions in Physics Page 36 InterviewSolution

1751.	The phase difference between the displacement wave and the pressure wave in sound wave is
Answer» The phase difference between the displacement wave and the pressure wave in sound wave is

Discussion

1752.	The system shown is in equilibrium. Find the accelerations of the blocks A, B and C just after the spring between B and C is cut. All blocks are of equal masses ‘m′ each and springs are of equal stiffness. (Assume springs to be ideal and take downward acceleration to be positive).
Answer» The system shown is in equilibrium. Find the accelerations of the blocks A, B and C just after the spring between B and C is cut. All blocks are of equal masses $‘ m^{'}$ each and springs are of equal stiffness. (Assume springs to be ideal and take downward acceleration to be positive).

Discussion

1753.	Component of vector →A=3^i+2^j+^k perpendicular to vector →B=^i−2^j is
Answer» Component of vector $\to A = 3^i + 2^j +^k$ perpendicular to vector $\to B =^i - 2^j$ is

Discussion

1754.	Two forces, →F and →F2 are acting on a body. One force is double that of the other force and the resultant is equal to the greater force. Then the angle between the two forces is
Answer» Two forces, $\to F$ and $_{2}$ are acting on a body. One force is double that of the other force and the resultant is equal to the greater force. Then the angle between the two forces is

Discussion

1755.	At a depth of 500 m under an ocean, what is the absolute pressure? Given density of sea water is 1.03×103 kg/m3. (Take g=10 m/s2 & 1 atm=105 Pa)
Answer» At a depth of $500 m$ under an ocean, what is the absolute pressure? Given density of sea water is $1.03 \times 10^{3} {kg/m}^{3}$ . (Take $g = 10 {m/s}^{2}$ & $1 atm = 10^{5} Pa$ )

Discussion

1756.	A Man moves on a straight horizontal road with a block of 2kg in his hand. If he covers a distance of 20m with constant velocity of 1m/s. Find work done by man on block during motion.
Answer» A Man moves on a straight horizontal road with a block of 2kg in his hand. If he covers a distance of 20m with constant velocity of 1m/s. Find work done by man on block during motion.

Discussion

1757.	Which of these are the reason why area vector can’t be lying on the plane of the area it represents?
Answer» Which of these are the reason why area vector can’t be lying on the plane of the area it represents?

Discussion

1758.	When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then
Answer» When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then

Discussion

1759.	An ideal gas is taken through a cycle 1231 (see figure) and the efficiency of the cycle was found to be 25%. When the same gas goes through the cycle 1341, the efficiency is 10%. Find the efficiency of the cycle 12341.
Answer» An ideal gas is taken through a cycle $1231$ (see figure) and the efficiency of the cycle was found to be $25 %$ . When the same gas goes through the cycle $1341$ , the efficiency is $10 %$ . Find the efficiency of the cycle $12341$ .

Discussion

1760.	Nuclei with same number of protons but different number of neutrons are called ___.Nuclei with same number of neutrons but different atomic number are called ___.Nuclei with same mass number are called ___.
Answer» Nuclei with same number of protons but different number of neutrons are called ___. Nuclei with same number of neutrons but different atomic number are called ___. Nuclei with same mass number are called ___.

1760.

Nuclei with same number of protons but different number of neutrons are called _.Nuclei with same number of neutrons but different atomic number are called _.Nuclei with same mass number are called ___.

Answer»

Nuclei with same number of protons but different number of neutrons are called ___.

Nuclei with same number of neutrons but different atomic number are called ___.

Nuclei with same mass number are called ___.

Discussion

1761.	Current density in a cylindrical wire of radius R is given asJ=⎧⎪⎪⎪⎨⎪⎪⎪⎩J0(xR−1)for 0≤x<R2J0xR for R2≤x≤R .The current flowing in the wire is
Answer» Current density in a cylindrical wire of radius $R$ is given as $J = ⎧ ⎪⎪⎪ ⎨ ⎪⎪⎪ ⎩ \begin{matrix} J_{0} (\frac{x}{R} - 1) for 0 \leq x < \frac{R}{2} J_{0} \frac{x}{R} for \frac{R}{2} \leq x \leq R \end{matrix}$ . The current flowing in the wire is

Discussion

1762.	Capacitance of a parallel plate capacitor becomes 43 times its original value if a dielectric slab of thickness t=d2 is inserted between the plates [d is the separation between the plates]. The dielectric constant of the slab is
Answer» Capacitance of a parallel plate capacitor becomes $\frac{4}{3}$ times its original value if a dielectric slab of thickness $t = \frac{d}{2}$ is inserted between the plates [ $d$ is the separation between the plates]. The dielectric constant of the slab is

Discussion

1763.	A body of mass 2 kg has kinetic energy of 400 J. A constant force of 10 N is applied in the opposite direction of velocity. Find the magnitude of the momentum of the body 2 s after application of the force.
Answer» A body of mass $2 kg$ has kinetic energy of $400 J$ . A constant force of $10 N$ is applied in the opposite direction of velocity. Find the magnitude of the momentum of the body $2 s$ after application of the force.

Discussion

1764.	The change in internal energy of a system that has absorbed 2 kcal of heat and does 500 J of work is
Answer» The change in internal energy of a system that has absorbed $2 kcal$ of heat and does $500 J$ of work is

Discussion

1765.	A bird is flying towards north with a velocity 40 km/h and a train is moving with a velocity 40 km/h towards east. What is the velocity of the bird noted by a man in the train?
Answer» A bird is flying towards north with a velocity 40 km/h and a train is moving with a velocity 40 km/h towards east. What is the velocity of the bird noted by a man in the train?

Discussion

1766.	With increase in temperature, the resistivity of a semiconductor?
Answer» With increase in temperature, the resistivity of a semiconductor?

Discussion

1767.	A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power of 0.5 W to the particle. If the initial speed (in ms−1) of the particle is zero, then the speed (in ms−1) of the particle after 5 s is:
Answer» A particle of mass $0.2 kg$ is moving in one dimension under a force that delivers a constant power of $0.5 W$ to the particle. If the initial speed (in ${ms}^{- 1}$ ) of the particle is zero, then the speed (in ${ms}^{- 1}$ ) of the particle after $5 s$ is:

Discussion

1768.	A ball is dropped from a height h on to a floor. If in each collision its speed becomes e times of its striking value, then time taken by ball to stop rebounding is (Here, e is coefficient of restitution between the ball and the floor)
Answer» A ball is dropped from a height $h$ on to a floor. If in each collision its speed becomes $e$ times of its striking value, then time taken by ball to stop rebounding is (Here, $e$ is coefficient of restitution between the ball and the floor)

Discussion

1769.	Evaluate ∫(x+1x)2dx
Answer» Evaluate $\int {(x + \frac{1}{x})}^{2} d x$

Discussion

1770.	The mass of a rocket is 2400 kg. The nozzle of the rocket is designed to give velocity of 200 m/s to the gases produced after combustion of the fuel. If the rocket has to achieve an acceleration of 15 m/s2, what should be the rate of burning of the fuel? (Take g=10 m/s2)
Answer» The mass of a rocket is $2400 kg$ . The nozzle of the rocket is designed to give velocity of $200 m/s$ to the gases produced after combustion of the fuel. If the rocket has to achieve an acceleration of $15 {m/s}^{2}$ , what should be the rate of burning of the fuel? (Take $g = 10 {m/s}^{2}$ )

Discussion

1771.	In an isothermal reversible expansion, if the volume of 96 g of oxygen at 27∘C is increased from 70 litres to 140 litres, then the work done by the gas will be
Answer» In an isothermal reversible expansion, if the volume of $96 g$ of oxygen at $27^{\circ} C$ is increased from $70 litres$ to $140 litres$ , then the work done by the gas will be

Discussion

1772.	An electromagnetic wave of frequency v = 3 MHz passes from vacuum into dielectric medium with permittivity ϵ=4.0 Then
Answer» An electromagnetic wave of frequency v = 3 MHz passes from vacuum into dielectric medium with permittivity $ϵ = 4.0$ Then

Discussion

1773.	On a two-lane road, car A is travelling with a speed of 36 km/hr. Two cars, B and C approach car A in opposite directions with a speed of 54 km/h. At a certain instant, when the distance AB is equal to AC, both 1 km, B decided to overtake A before C does. What minimum acceleration of car B is required to avoid an accident.
Answer» On a two-lane road, car A is travelling with a speed of 36 km/hr. Two cars, B and C approach car A in opposite directions with a speed of 54 km/h. At a certain instant, when the distance AB is equal to AC, both 1 km, B decided to overtake A before C does. What minimum acceleration of car B is required to avoid an accident.

Discussion

1774.	A student starts from his physics classroom considered to be origin, walks 20 m down the corridor, then stops, turns around and walks 5 m back to his classroom. He stops 15 m from the door. Total time of motion is 25.0 sec. What is his average speed?
Answer» A student starts from his physics classroom considered to be origin, walks $20 m$ down the corridor, then stops, turns around and walks $5 m$ back to his classroom. He stops $15 m$ from the door. Total time of motion is $25.0 s e c$ . What is his average speed?

Discussion

1775.	A ball of mass 2 kg is suspended by a light string of length 10 m as shown in the figure. It is imparted a horizontal velocity of 50 m/s . Calculate the speed of the ball at point B. (Take g=9.8 m/s2 )
Answer» A ball of mass $2 kg$ is suspended by a light string of length $10 m$ as shown in the figure. It is imparted a horizontal velocity of $50 m/s$ . Calculate the speed of the ball at point $B$ . (Take $g = 9.8 {m/s}^{2}$ )

Discussion

1776.	Three capacitors of capacitances 3μF,9μFand 18μFare connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases will be
Answer» Three capacitors of capacitances 3μF,9μFand 18μFare connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases will be

1776.

Three capacitors of capacitances 3μF,9μFand 18μFare connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases will be

Answer»

Three capacitors of capacitances 3μF,9μFand 18μFare connected once in

series and another time in parallel. The ratio of equivalent capacitance in

the two cases will be

Discussion

1777.	If the gauge pressure at the bottom of a water tank is 2.7 kPa, then what is the depth of the water in the tank?[Take g=10 m/s2]
Answer» If the gauge pressure at the bottom of a water tank is $2.7 kPa$ , then what is the depth of the water in the tank? [Take $g = 10 {m/s}^{2}$ ]

Discussion

1778.	The ratio of time taken by a body to cover an equal distance while sliding down a smooth to rough identical inclined plane of angle θ is ‘n′. Find the coefficient of friction.
Answer» The ratio of time taken by a body to cover an equal distance while sliding down a smooth to rough identical inclined plane of angle $θ$ is $‘ n^{'}$ . Find the coefficient of friction.

Discussion

1779.	A hall has the dimensions 10 m×12 m×14 m. Taking one corner as the origin . A fly starting from origin ends up at a diagonally opposite corner. Then calculate the magnitude of the position vector of fly.
Answer» A hall has the dimensions $10 m \times 12 m \times 14 m$ . Taking one corner as the origin . A fly starting from origin ends up at a diagonally opposite corner. Then calculate the magnitude of the position vector of fly.

Discussion

1780.	A potential difference of 6V is applied to a coil inductance 0.5H and a resistance of 4 ohm connected in series. The time taken for the current to reach half the maximum value is (in seconds)
Answer» A potential difference of 6V is applied to a coil inductance 0.5H and a resistance of 4 ohm connected in series. The time taken for the current to reach half the maximum value is (in seconds)

Discussion

1781.	Choose among the following the correct pair of antiparallel vectors.
Answer» Choose among the following the correct pair of antiparallel vectors.

Discussion

1782.	In a common base amplifier, the phase difference between the input signal voltage and output voltage is
Answer» In a common base amplifier, the phase difference between the input signal voltage and output voltage is

Discussion

1783.	When three forces of 50 N, 30 N and 15 N act on a body, then the body is
Answer» When three forces of 50 N, 30 N and 15 N act on a body, then the body is

Discussion

1784.	The tension in the inextensible string using pseudo-force concept is (in N) (Take g=10 m/s2)
Answer» The tension in the inextensible string using pseudo-force concept is (in N) (Take $g = 10 m / s^{2}$ )

Discussion

1785.	Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 ms−1, find the tension in the wire.
Answer» Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 $m s^{- 1}$ , find the tension in the wire.

1785.

Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 ms−1, find the tension in the wire.

Answer»

Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 $m s^{- 1}$ , find the tension in the wire.

Discussion

1786.	The de-Broglie wavelength of an electron having 80eV of energy is nearly (leV=1.6×10−19J Mass of electron 9×10−31kg and Plank's constant 6.6×10−34Jsec)
Answer» The de-Broglie wavelength of an electron having 80eV of energy is nearly $(l e V = 1.6 \times 10^{- 19} J$ Mass of electron $9 \times 10^{- 31} k g$ and Plank's constant $6.6 \times 10^{- 34} J s e c)$

Discussion

1787.	Two blocks of masses m1 and m2 inter connected by a spring of stiffness k are placed on a horizontal surface. If a constant horizontal force F acts on the block m1 it slides through a distance x whereas m2 remains stationary. If the coefficient of friction between all contacting surfaces is μ, find the speed of the block m1 as the function x.
Answer» Two blocks of masses $m_{1}$ and $m_{2}$ inter connected by a spring of stiffness $k$ are placed on a horizontal surface. If a constant horizontal force $F$ acts on the block $m_{1}$ it slides through a distance $x$ whereas $m_{2}$ remains stationary. If the coefficient of friction between all contacting surfaces is $μ$ , find the speed of the block $m_{1}$ as the function $x$ .

Discussion

1788.	A block begins to slide down a rough inclined plane of angle 45∘ and moves 1 m in 4√2 second. What is the coefficient of friction between the plane and the block? g=10 m/s2
Answer» A block begins to slide down a rough inclined plane of angle $45^{\circ}$ and moves $1 m$ in $\sqrt[4]{2} second$ . What is the coefficient of friction between the plane and the block? $g = 10 m / s^{2}$

Discussion

1789.	1 g mole of an ideal gas at STP is subjected to a reversible adiabatic expansion to double its volume. Find the change in internal energy (γ=1.4).
Answer» $1 g$ mole of an ideal gas at STP is subjected to a reversible adiabatic expansion to double its volume. Find the change in internal energy $(γ = 1.4)$ .

Discussion

1790.	Acceleration of the particle in a rectilinear motion is given as a=3t2+4t−3 in (m/s2). The velocity of the particle as a function of time t is(Given, at t=0,u=1 m/s)
Answer» Acceleration of the particle in a rectilinear motion is given as $a = 3 t^{2} + 4 t - 3$ in $(m / s^{2})$ . The velocity of the particle as a function of time $t$ is (Given, at $t = 0, u = 1 m / s$ )

Discussion

1791.	A vector has a magnitude 12. When its tail is at origin, it lies between the positive x - axis and the negative y - axis and makes an angle 30∘ with the x- axis. It’s y - component is
Answer» A vector has a magnitude $12$ . When its tail is at origin, it lies between the positive x - axis and the negative y - axis and makes an angle $30^{\circ}$ with the x- axis. It’s y - component is

Discussion

1792.	In a certain circuit current changes with time according to i=2√t.The r.m.s value of current between t = 2 to t = 4s will be
Answer» In a certain circuit current changes with time according to $i = 2 \sqrt{t}$ .The r.m.s value of current between t = 2 to t = 4s will be

Discussion

1793.	The mass density of the material of a T joint is 2 kg/m. The dimensions of this joint are shown in the figure.What is the approximate moment of inertia (MI) of the T joint about an axis passing through their common joining point and perpendicular to the plane of structure?
Answer» The mass density of the material of a $T$ joint is $2 kg/m$ . The dimensions of this joint are shown in the figure. What is the approximate moment of inertia ( $MI$ ) of the $T$ joint about an axis passing through their common joining point and perpendicular to the plane of structure?

Discussion

1794.	Match the series with its corresponding n1 value in the Rydberg's FormulaA. Pascheni) 2B. Lymanii) 1C. Balmeriii) 3D. Pfundiv) 5E. Brackettv) 4
Answer» Match the series with its corresponding $n_{1}$ value in the Rydberg's Formula $\begin{matrix} A . P a s c h e n & i) 2 B . L y m a n & i i) 1 C . B a l m e r & i i i) 3 D . P f u n d & i v) 5 E . B r a c k e t t & v) 4 \end{matrix}$

1794.

Match the series with its corresponding n1 value in the Rydberg's FormulaA. Pascheni) 2B. Lymanii) 1C. Balmeriii) 3D. Pfundiv) 5E. Brackettv) 4

Answer»

Match the series with its corresponding $n_{1}$ value in the Rydberg's Formula

$\begin{matrix} A . P a s c h e n & i) 2 B . L y m a n & i i) 1 C . B a l m e r & i i i) 3 D . P f u n d & i v) 5 E . B r a c k e t t & v) 4 \end{matrix}$

Discussion

1795.	If a thermometer on C−scale reads freezing point of water as 20 C and boiling point as 150 C, how much the thermometer would read when the actual temperature is 60∘C?
Answer» If a thermometer on $C -$ scale reads freezing point of water as $20 C$ and boiling point as $150 C$ , how much the thermometer would read when the actual temperature is $60^{\circ} C$ ?

Discussion

1796.	Figure below shows a circuit which may be used to compare the resistance R of an unknown resistor with a 100 Ω standard. The distances l from one end of the potentiometer slider wire to the balance point are 400 mm and 588 mm when X is connected to Y and Z respectively. The length of the slide is 1.00 m. What is the value of resistance R?
Answer» Figure below shows a circuit which may be used to compare the resistance $R$ of an unknown resistor with a $100 Ω$ standard. The distances $l$ from one end of the potentiometer slider wire to the balance point are 400 mm and 588 mm when X is connected to Y and Z respectively. The length of the slide is 1.00 m. What is the value of resistance R?

Discussion

1797.	The relation between time t and distance x is t=αx2+βx where α and β are constants. The retardation is
Answer» The relation between time $t$ and distance $x$ is $t = α x^{2} + β x$ where $α$ and $β$ are constants. The retardation is

Discussion

1798.	A boy throws a ball with a velocity u at an angle θ with the horizontal. At the same instant he starts running with uniform velocity to catch the ball before it hits the ground. To achieve this, he should run with a velocity of :
Answer» A boy throws a ball with a velocity u at an angle θ with the horizontal. At the same instant he starts running with uniform velocity to catch the ball before it hits the ground. To achieve this, he should run with a velocity of :

Discussion

1799.	A body is thrown with velocity 20 m/s at an angle of 60∘ with the horizontal. The time gap between the two positions of body where velocity of body makes an angle of 30∘ with horizontal is(Take g=10 m/s2)
Answer» A body is thrown with velocity $20 m / s$ at an angle of $60^{\circ}$ with the horizontal. The time gap between the two positions of body where velocity of body makes an angle of $30^{\circ}$ with horizontal is (Take $g = 10 m / s^{2}$ )

Discussion

1800.	Which of the following graphs correctly represent the process represented in the given P−V graph?
Answer» Which of the following graphs correctly represent the process represented in the given $P - V$ graph?

Discussion

Explore topic-wise InterviewSolutions in .

The phase difference between the displacement wave and the pressure wave in sound wave is

The system shown is in equilibrium. Find the accelerations of the blocks A, B and C just after the spring between B and C is cut. All blocks are of equal masses ‘m′ each and springs are of equal stiffness. (Assume springs to be ideal and take downward acceleration to be positive).

Component of vector →A=3^i+2^j+^k perpendicular to vector →B=^i−2^j is

Two forces, →F and →F2 are acting on a body. One force is double that of the other force and the resultant is equal to the greater force. Then the angle between the two forces is

At a depth of 500 m under an ocean, what is the absolute pressure? Given density of sea water is 1.03×103 kg/m3. (Take g=10 m/s2 &amp; 1 atm=105 Pa)

A Man moves on a straight horizontal road with a block of 2kg in his hand. If he covers a distance of 20m with constant velocity of 1m/s. Find work done by man on block during motion.

Which of these are the reason why area vector can’t be lying on the plane of the area it represents?

When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then

An ideal gas is taken through a cycle 1231 (see figure) and the efficiency of the cycle was found to be 25%. When the same gas goes through the cycle 1341, the efficiency is 10%. Find the efficiency of the cycle 12341.

Nuclei with same number of protons but different number of neutrons are called ___.Nuclei with same number of neutrons but different atomic number are called ___.Nuclei with same mass number are called ___.

Current density in a cylindrical wire of radius R is given asJ=⎧⎪⎪⎪⎨⎪⎪⎪⎩J0(xR−1)for 0≤x&lt;R2J0xR for R2≤x≤R .The current flowing in the wire is

Capacitance of a parallel plate capacitor becomes 43 times its original value if a dielectric slab of thickness t=d2 is inserted between the plates [d is the separation between the plates]. The dielectric constant of the slab is

A body of mass 2 kg has kinetic energy of 400 J. A constant force of 10 N is applied in the opposite direction of velocity. Find the magnitude of the momentum of the body 2 s after application of the force.

The change in internal energy of a system that has absorbed 2 kcal of heat and does 500 J of work is

A bird is flying towards north with a velocity 40 km/h and a train is moving with a velocity 40 km/h towards east. What is the velocity of the bird noted by a man in the train?

With increase in temperature, the resistivity of a semiconductor?

A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power of 0.5 W to the particle. If the initial speed (in ms−1) of the particle is zero, then the speed (in ms−1) of the particle after 5 s is:

A ball is dropped from a height h on to a floor. If in each collision its speed becomes e times of its striking value, then time taken by ball to stop rebounding is (Here, e is coefficient of restitution between the ball and the floor)

Evaluate ∫(x+1x)2dx

The mass of a rocket is 2400 kg. The nozzle of the rocket is designed to give velocity of 200 m/s to the gases produced after combustion of the fuel. If the rocket has to achieve an acceleration of 15 m/s2, what should be the rate of burning of the fuel? (Take g=10 m/s2)

In an isothermal reversible expansion, if the volume of 96 g of oxygen at 27∘C is increased from 70 litres to 140 litres, then the work done by the gas will be

An electromagnetic wave of frequency v = 3 MHz passes from vacuum into dielectric medium with permittivity ϵ=4.0 Then

A student starts from his physics classroom considered to be origin, walks 20 m down the corridor, then stops, turns around and walks 5 m back to his classroom. He stops 15 m from the door. Total time of motion is 25.0 sec. What is his average speed?

A ball of mass 2 kg is suspended by a light string of length 10 m as shown in the figure. It is imparted a horizontal velocity of 50 m/s . Calculate the speed of the ball at point B. (Take g=9.8 m/s2 )

Three capacitors of capacitances 3μF,9μFand 18μFare connected once in series and another time in parallel. The ratio of equivalent capacitance in the two cases will be

If the gauge pressure at the bottom of a water tank is 2.7 kPa, then what is the depth of the water in the tank?[Take g=10 m/s2]

The ratio of time taken by a body to cover an equal distance while sliding down a smooth to rough identical inclined plane of angle θ is ‘n′. Find the coefficient of friction.

A hall has the dimensions 10 m×12 m×14 m. Taking one corner as the origin . A fly starting from origin ends up at a diagonally opposite corner. Then calculate the magnitude of the position vector of fly.

A potential difference of 6V is applied to a coil inductance 0.5H and a resistance of 4 ohm connected in series. The time taken for the current to reach half the maximum value is (in seconds)

Choose among the following the correct pair of antiparallel vectors.

In a common base amplifier, the phase difference between the input signal voltage and output voltage is

When three forces of 50 N, 30 N and 15 N act on a body, then the body is

The tension in the inextensible string using pseudo-force concept is (in N) (Take g=10 m/s2)

Consider the situation shown in figure. The wire which has a mass of 4.00 g oscillates in its second harmonic and sets the air column in the tube into vibrations in its fundamental mode. Assuming that the speed of sound in air is 340 ms−1, find the tension in the wire.

The de-Broglie wavelength of an electron having 80eV of energy is nearly (leV=1.6×10−19J Mass of electron 9×10−31kg and Plank's constant 6.6×10−34Jsec)

A block begins to slide down a rough inclined plane of angle 45∘ and moves 1 m in 4√2 second. What is the coefficient of friction between the plane and the block? g=10 m/s2

1 g mole of an ideal gas at STP is subjected to a reversible adiabatic expansion to double its volume. Find the change in internal energy (γ=1.4).

Acceleration of the particle in a rectilinear motion is given as a=3t2+4t−3 in (m/s2). The velocity of the particle as a function of time t is(Given, at t=0,u=1 m/s)

A vector has a magnitude 12. When its tail is at origin, it lies between the positive x - axis and the negative y - axis and makes an angle 30∘ with the x- axis. It’s y - component is

In a certain circuit current changes with time according to i=2√t.The r.m.s value of current between t = 2 to t = 4s will be

The mass density of the material of a T joint is 2 kg/m. The dimensions of this joint are shown in the figure.What is the approximate moment of inertia (MI) of the T joint about an axis passing through their common joining point and perpendicular to the plane of structure?

Match the series with its corresponding n1 value in the Rydberg's FormulaA. Pascheni) 2B. Lymanii) 1C. Balmeriii) 3D. Pfundiv) 5E. Brackettv) 4

If a thermometer on C−scale reads freezing point of water as 20 C and boiling point as 150 C, how much the thermometer would read when the actual temperature is 60∘C?

The relation between time t and distance x is t=αx2+βx where α and β are constants. The retardation is

A boy throws a ball with a velocity u at an angle θ with the horizontal. At the same instant he starts running with uniform velocity to catch the ball before it hits the ground. To achieve this, he should run with a velocity of :

A body is thrown with velocity 20 m/s at an angle of 60∘ with the horizontal. The time gap between the two positions of body where velocity of body makes an angle of 30∘ with horizontal is(Take g=10 m/s2)

Which of the following graphs correctly represent the process represented in the given P−V graph?

At a depth of 500 m under an ocean, what is the absolute pressure? Given density of sea water is 1.03×103 kg/m3. (Take g=10 m/s2 & 1 atm=105 Pa)

Nuclei with same number of protons but different number of neutrons are called _.Nuclei with same number of neutrons but different atomic number are called _.Nuclei with same mass number are called ___.

Current density in a cylindrical wire of radius R is given asJ=⎧⎪⎪⎪⎨⎪⎪⎪⎩J0(xR−1)for 0≤x<R2J0xR for R2≤x≤R .The current flowing in the wire is