50278 + Interview Questions in Physics

1.	Two rods OA and OB of equal length and mass are lying on the xy plane as shown in figure. Let Ix,Iy and Iz be the moment of inertia of the system about x,y and z axis respectively. Then,
Answer» Two rods $O A$ and $O B$ of equal length and mass are lying on the $x y$ plane as shown in figure. Let $I_{x}, I_{y}$ and $I_{z}$ be the moment of inertia of the system about $x, y$ and $z$ axis respectively. Then,

Discussion

2.	Define eddy current?
Answer» Define eddy current?

Discussion

3.	I read there are n subshella in the nth subshell if n=1 it will be s n=2 it will be s p n=3 it will be s p d n=4 it will be s p d f if n=5 would it will be s p d f s or something else?
Answer» I read there are n subshella in the n^th subshell if n=1 it will be s n=2 it will be s p n=3 it will be s p d n=4 it will be s p d f if n=5 would it will be s p d f s or something else?

Discussion

4.	From a height of 100 m a ball is dropped and simentaniously from the ground a ball is fired upward at a velocity of 25 m/s (assuming g as 10 m/s) at which time and distance the two balls meet ?
Answer» From a height of 100 m a ball is dropped and simentaniously from the ground a ball is fired upward at a velocity of 25 m/s (assuming g as 10 m/s) at which time and distance the two balls meet ?

Discussion

5.	A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored? (Assume that magnitude of resistive force is constant )
Answer» A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored? (Assume that magnitude of resistive force is constant )

Discussion

6.	What is the relationship between the kinetic energy and potential energy ?
Answer» What is the relationship between the kinetic energy and potential energy ?

Discussion

7.	An electrician has two resistive coils. He can obtain the resistance of 3 ohm, 4 ohm, 12 ohm and 16 ohm by keeping them alone and by connecting them in series and parallel. The resistance of these two coils are how much in ohms?
Answer» An electrician has two resistive coils. He can obtain the resistance of 3 ohm, 4 ohm, 12 ohm and 16 ohm by keeping them alone and by connecting them in series and parallel. The resistance of these two coils are how much in ohms?

Discussion

8.	In the pulley system shown in the figure, the radii of the bigger and smaller pulleys are 2 m and 1 m respectively. Find the resultant torque at point O. (Take g=10 m/s2)
Answer» In the pulley system shown in the figure, the radii of the bigger and smaller pulleys are $2 m$ and $1 m$ respectively. Find the resultant torque at point $O$ . (Take $g = 10 {m/s}^{2})$

Discussion

9.	Unpolarized light of intensity I passes through an ideal polariser A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be I2. Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be I8. The angle between polarizer A and C is :
Answer» Unpolarized light of intensity I passes through an ideal polariser A. Another identical polarizer $B$ is placed behind $A$ . The intensity of light beyond B is found to be $\frac{I}{2}$ . Now another identical polarizer $C$ is placed between A and B. The intensity beyond $B$ is now found to be $\frac{I}{8}$ . The angle between polarizer $A$ and $C$ is :

Discussion

10.	The volume of a spherical body is decreased by 10-3% when it is subjected to pressure of 40 atmospheres. Find the bulk modulus of body. (1 atm = 1.01 x 103 N/m2).
Answer» The volume of a spherical body is decreased by 10^-3% when it is subjected to pressure of 40 atmospheres. Find the bulk modulus of body. (1 atm = 1.01 x 10³ N/m²).

Discussion

11.	Amplitude of electric field in a laser beam of power 4.4 mW with cross-sectional area of 2 mm2 is
Answer» Amplitude of electric field in a laser beam of power 4.4 mW with cross-sectional area of $2 m m^{2}$ is

Discussion

12.	The electric field in a region is given by E=(2^i+3^j)×103NC−1 The electric flux through a rectangular surface 10cm×20cm held parallel to the y-z plance is
Answer» The electric field in a region is given by $E = (2^i + 3^j) \times 10^{3} N C^{- 1}$ The electric flux through a rectangular surface $10 c m \times 20 c m$ held parallel to the y-z plance is

Discussion

13.	The sum of the measures of the angles of regular polygen is 2160∘. How many sides does it have ?
Answer» The sum of the measures of the angles of regular polygen is $2160^{\circ}$ . How many sides does it have ?

Discussion

14.	An ideal gas is expanding such that PT2=constant. The coefficient volume expansion of the gas is
Answer» An ideal gas is expanding such that $P T^{2} = c o n s t a n t$ . The coefficient volume expansion of the gas is

Discussion

15.	What is earthing?
Answer» What is earthing?

Discussion

16.	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

17.	Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75×10−3 N/m, then the diameter of capillary will be
Answer» Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is $75 \times 10^{- 3}$ N/m, then the diameter of capillary will be

17.

Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75×10−3 N/m, then the diameter of capillary will be

Answer»

Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is $75 \times 10^{- 3}$ N/m, then the diameter of capillary will be

Discussion

18.	Which of the following is the unit vector perpendicular to →A and →B?
Answer» Which of the following is the unit vector perpendicular to $\to A and \to B$ ?

Discussion

19.	A car moving at a speed of 30 kilo meters per hour is brought to a halt in 8 metres by applying brakes. If the same car is moving at 60 km. per hour, it can be brought to a halt with same breaking power in
Answer» A car moving at a speed of 30 kilo meters per hour is brought to a halt in 8 metres by applying brakes. If the same car is moving at 60 km. per hour, it can be brought to a halt with same breaking power in

Discussion

20.	The path followed by a body projected along y-axis is given as by y=√3x−(12)x2, if g = 10 m/s, then the initial velocity of projectile will be – (x and y are in m)
Answer» The path followed by a body projected along y-axis is given as by $y = \sqrt{3} x - (\frac{1}{2}) x^{2}$ , if g = 10 m/s, then the initial velocity of projectile will be – (x and y are in m)

Discussion

21.	Potentiometer is an ideal voltmeter because:
Answer» Potentiometer is an ideal voltmeter because:

Discussion

22.	Calculate the Q-values of the following fusion reactions: (a) 21H+21H→31H+11H (b) 21H+21H→23He+n (c) 21H+31H→24He+n Atomic masses are m(21He)=2.014102 u,m(31He)=3.016049 u,m(32He)=3.016029 u,m(42He)=4.002603 u.
Answer» Calculate the Q-values of the following fusion reactions: (a) $_{1}^{2} H +_{1}^{2} H \to_{1}^{3} H +_{1}^{1} H$ (b) $_{1}^{2} H +_{1}^{2} H \to_{3}^{2} H e + n$ (c) $_{1}^{2} H +_{1}^{3} H \to_{4}^{2} H e + n$ Atomic masses are $m (_{1}^{2} H e) = 2.014102 u, m (_{1}^{3} H e) = 3.016049 u, m (_{2}^{3} H e) = 3.016029 u, m (_{2}^{4} H e) = 4.002603 u$ .

22.

Calculate the Q-values of the following fusion reactions: (a) 21H+21H→31H+11H (b) 21H+21H→23He+n (c) 21H+31H→24He+n Atomic masses are m(21He)=2.014102 u,m(31He)=3.016049 u,m(32He)=3.016029 u,m(42He)=4.002603 u.

Answer»

Calculate the Q-values of the following fusion reactions:

(a) $_{1}^{2} H +_{1}^{2} H \to_{1}^{3} H +_{1}^{1} H$

(b) $_{1}^{2} H +_{1}^{2} H \to_{3}^{2} H e + n$

(c) $_{1}^{2} H +_{1}^{3} H \to_{4}^{2} H e + n$

Atomic masses are $m (_{1}^{2} H e) = 2.014102 u, m (_{1}^{3} H e) = 3.016049 u, m (_{2}^{3} H e) = 3.016029 u, m (_{2}^{4} H e) = 4.002603 u$ .

Discussion

23.	The current through a wire depends on time as i = i0+αt, where i0 = 10 A and α=4As−1. Find the charge crossed through a section of the wire in 10 seconds.
Answer» The current through a wire depends on time as i = $i_{0} + α t,$ where $i_{0}$ = 10 A and $α = 4 A s^{- 1}$ . Find the charge crossed through a section of the wire in 10 seconds.

Discussion

24.	A long cylindrical wire carries a positive charge of linear density 2×10−8Cm−1 . An electron revolves around it in a circular path under the influence of the attractive electrostatic force. Find the kinetic energy of the electron . Note that it is independent of the radius.
Answer» A long cylindrical wire carries a positive charge of linear density $2 \times 10^{- 8} C m^{- 1}$ . An electron revolves around it in a circular path under the influence of the attractive electrostatic force. Find the kinetic energy of the electron . Note that it is independent of the radius.

Discussion

25.	The density of a gas at temperature 283.2 k is 25 g/cc. At what temperature will its density become 24 g/cc,if the pressure is kept constant?
Answer» The density of a gas at temperature 283.2 k is 25 g/cc. At what temperature will its density become 24 g/cc,if the pressure is kept constant?

Discussion

26.	Four silicon diodes are connected as shown in the figure. Assume the diodes Ω to be ideal. The current through the resistor ‘R’ is
Answer» Four silicon diodes are connected as shown in the figure. Assume the diodes $Ω$ to be ideal. The current through the resistor ‘R’ is

Discussion

27.	Certain amount of an ideal gas is contained in a closed vessel. The vessel is moving with a constant velcity v. The molecular mass of gas is M. The rise in temperature of the gas when the vessel is suddenly stopped is γ=CP/CV
Answer» Certain amount of an ideal gas is contained in a closed vessel. The vessel is moving with a constant velcity $v$ . The molecular mass of gas is M. The rise in temperature of the gas when the vessel is suddenly stopped is $γ = C_{P} / C_{V}$

Discussion

28.	A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2mms. Find the induced emf in the loop when the radius is 2 cm.
Answer» A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at $2 \frac{m m}{s}$ . Find the induced emf in the loop when the radius is 2 cm.

Discussion

29.	A block, tied between two springs, is in equilibrium. If upper spring is cut then the acceleration of the block just after cut is 6 m/s2 downwards. Now, if instead of upper spring, lower spring is cut, find the acceleration of the block. (take g = 10 m/s2
Answer» A block, tied between two springs, is in equilibrium. If upper spring is cut then the acceleration of the block just after cut is $6 m / s^{2}$ downwards. Now, if instead of upper spring, lower spring is cut, find the acceleration of the block. (take g = 10 $m / s^{2}$

Discussion

30.	In the following diagram `q' is a fixed point charge, A is small block of mass `m' and carrying a positive charge `Q'. The coefficient of static friction between A and inclined plane is (0.1.) The minimum and maximum values of `q' required for `A' to be in static equilibrium are respectively ___ (Take K=14πϵ0) (Assume wedge is fixed to ground and tan370=35)
Answer» In the following diagram `q' is a fixed point charge, A is small block of mass `m' and carrying a positive charge `Q'. The coefficient of static friction between A and inclined plane is (0.1.) The minimum and maximum values of `q' required for `A' to be in static equilibrium are respectively ___ $(T a k e K = \frac{1}{4 π ϵ_{0}})$ (Assume wedge is fixed to ground and $t a n 370 = \frac{3}{5}$ )

30.

In the following diagram `q' is a fixed point charge, A is small block of mass `m' and carrying a positive charge `Q'. The coefficient of static friction between A and inclined plane is (0.1.) The minimum and maximum values of `q' required for `A' to be in static equilibrium are respectively ___ (Take K=14πϵ0) (Assume wedge is fixed to ground and tan370=35)

Answer»

In the following diagram `q' is a fixed point charge, A is small block of mass `m' and carrying a positive charge `Q'.
The coefficient of static friction between A and inclined plane is (0.1.) The minimum and maximum values of `q' required for `A' to be in static equilibrium are respectively ___

$(T a k e K = \frac{1}{4 π ϵ_{0}})$ (Assume wedge is fixed to ground and $t a n 370 = \frac{3}{5}$ )

Discussion

31.	Two plane mirrors are parallel to each other and an object O is placed between them. The distance (in cm) of the first three images from the mirror M2 after reflection from the mirror M2 will be
Answer» Two plane mirrors are parallel to each other and an object $O$ is placed between them. The distance (in $cm$ ) of the first three images from the mirror $M_{2}$ after reflection from the mirror $M_{2}$ will be

Discussion

32.	A hospital uses an ultrasonic scanner to locate tumors in a tissue. What is the wavelength of ultrasonic sound wave in the tissue if scanner operates at 4.2 MHz and velocity of sound in tissue is 1.7 km/s?
Answer» A hospital uses an ultrasonic scanner to locate tumors in a tissue. What is the wavelength of ultrasonic sound wave in the tissue if scanner operates at $4.2 MHz$ and velocity of sound in tissue is $1.7 km/s$ ?

Discussion

33.	Match the column I with column II
Answer» Match the column I with column II

33.

Match the column I with column II

Answer»

Match the column I with column II

Discussion

34.	A particle starts from rest and moves with an acceleration of where 't' is in seconds. The velocity of the particle when it is 2 m from the origin is
Answer» A particle starts from rest and moves with an acceleration of where 't' is in seconds. The velocity of the particle when it is 2 m from the origin is

Discussion

35.	Water flows in a horizontal tube as shown in figure. The pressure of water changes by 600N/m2 between x and y where the areas of cross section are 3 cm2 and 1.5cm2 respectively. Find the rate of flow of water through the tube.
Answer» Water flows in a horizontal tube as shown in figure. The pressure of water changes by $600 N / m^{2}$ between x and y where the areas of cross section are $3 c m^{2}$ and $1.5 c m^{2}$ respectively. Find the rate of flow of water through the tube.

Discussion

36.	Two wires are kept tight between the same pair of supports. The tensions in the wire are in the ratio 3:4. Their radii are in the ratio 1:2 and the density are in the ratio 3:4. The ratio of their fundamental frequencies are
Answer» Two wires are kept tight between the same pair of supports. The tensions in the wire are in the ratio $3 : 4$ . Their radii are in the ratio $1 : 2$ and the density are in the ratio $3 : 4$ . The ratio of their fundamental frequencies are

Discussion

37.	A point mass oscillates along the x−axis according to the law x=x0cos(ωt−π/4). If the acceleration of the particle is written as a=Acos(ωt+δ), then
Answer» A point mass oscillates along the $x -$ axis according to the law $x = x_{0} cos (ω t - π / 4)$ . If the acceleration of the particle is written as $a = A cos (ω t + δ)$ , then

Discussion

38.	The current I through a rod is given by I=0.2V1/2, where V is the potential difference across it. The rod is connected in series with a resistance across a 6V battery of negligible internal resistance. What is the value of resistance such that the power dissipated in the rod is three times that dissipated in the resistor?
Answer» The current I through a rod is given by $I = 0.2 V^{1 / 2}$ , where V is the potential difference across it. The rod is connected in series with a resistance across a 6V battery of negligible internal resistance. What is the value of resistance such that the power dissipated in the rod is three times that dissipated in the resistor?

Discussion

39.	A charged particle is fired at an angle θ to a uniform magnetic field directed along the x–axis. During its motion along a helical path, if the pitch of the helical path is equal to the maximum distance of the particle from the x– axis, then tanθ is equal to
Answer» A charged particle is fired at an angle $θ$ to a uniform magnetic field directed along the $x -$ axis. During its motion along a helical path, if the pitch of the helical path is equal to the maximum distance of the particle from the $x -$ axis, then $tan θ$ is equal to

Discussion

40.	Sunlight of intensity 1.3 kWm−2 is incident normally on a thin convex lens of focal length 20 cm. Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light (in kWm−2), at a distance 22 cm from the lens on the other side is
Answer» Sunlight of intensity $1.3 k W m^{- 2}$ is incident normally on a thin convex lens of focal length $20 c m$ . Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light (in $k W m^{- 2}$ ), at a distance $22 c m$ from the lens on the other side is

Discussion

41.	An ice block of volume 4π/3cm^3 is placed in an artificial satellite. When ice melts into water, then its surface area will be, if densities of ice and water are assumed to be same.
Answer» An ice block of volume 4π/3cm^3 is placed in an artificial satellite. When ice melts into water, then its surface area will be, if densities of ice and water are assumed to be same.

Discussion

42.	Two forces whose magnitudes are in the ratio 3 : 5 give a resultant of 28 N. If the angle between them is 60∘, find the magnitude of each force and report n, where n is the sum of the two forces in newtons.
Answer» Two forces whose magnitudes are in the ratio 3 : 5 give a resultant of 28 N. If the angle between them is $60^{\circ}$ , find the magnitude of each force and report $n$ , where $n$ is the sum of the two forces in newtons.

Discussion

43.	Please explain the concept of short circuit
Answer» Please explain the concept of short circuit

Discussion

44.	A mass is attached to a spring and it executes simple harmonic motion. The mass is also attached to a sensor such that it makes a beeping sound whenever it is in its mean position. The mass is pulled to a length d from the mean position and the frequency f of the beep is noted Now the mass is pulled to a length d' (d' > d) and the frequency of beep was noted to be f'. After this the mass was pushed to d'' (d'' < d) and the frequency of beep was noted f''. Given d, d', d'' are all close to the mean position.
Answer» A mass is attached to a spring and it executes simple harmonic motion. The mass is also attached to a sensor such that it makes a beeping sound whenever it is in its mean position. The mass is pulled to a length d from the mean position and the frequency f of the beep is noted Now the mass is pulled to a length d' (d' $>$ d) and the frequency of beep was noted to be f'. After this the mass was pushed to d'' (d'' $<$ d) and the frequency of beep was noted f''. Given d, d', d'' are all close to the mean position.

Discussion

45.	The position of the particle is given by x=2t2−4t+4 in m. The average speed of the particle in 6 sec is
Answer» The position of the particle is given by $x = 2 t^{2} - 4 t + 4$ in $m$ . The average speed of the particle in $6 sec$ is

Discussion

46.	What is the current in the circuit shown below
Answer» What is the current in the circuit shown below

46.

What is the current in the circuit shown below

Answer»

What is the current in the circuit shown below

Discussion

47.	A mass 2 kg supported by a massless string wound around a uniform hollow cylinder of mass 2 kg and radius 1 m. If the string does not slip on the cylinder, then acceleration of mass is -
Answer» A mass $2 kg$ supported by a massless string wound around a uniform hollow cylinder of mass $2 kg$ and radius $1 m$ . If the string does not slip on the cylinder, then acceleration of mass is -

Discussion

48.	In the equation ∫dt√2at−t2=axsin−1[ta−1], where 't' is time. The value of x is
Answer» In the equation $\int \frac{d t}{\sqrt{2 a t - t^{2}}} = a^{x} {sin}^{- 1} [\frac{t}{a} - 1]$ , where ' $t$ ' is time. The value of $x$ is

Discussion

49.	What is rolling friction? What is the need of converting sliding friction into rolling friction?
Answer» What is rolling friction? What is the need of converting sliding friction into rolling friction?

Discussion

50.	An old man goes for morning walk on a semi-circular track of radius 30 m, if he starts from one end of the track and reaches to other end, the distance covered by the man will be
Answer» An old man goes for morning walk on a semi-circular track of radius $30 m$ , if he starts from one end of the track and reaches to other end, the distance covered by the man will be

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two rods OA and OB of equal length and mass are lying on the xy plane as shown in figure. Let Ix,Iy and Iz be the moment of inertia of the system about x,y and z axis respectively. Then,

Define eddy current?

I read there are n subshella in the nth subshell if n=1 it will be s​​​​​​​​​​​​​​ n=2 it will be s p n=3 it will be s p d n=4 it will be s p d f if n=5 would it will be s p d f s or something else?

From a height of 100 m a ball is dropped and simentaniously from the ground a ball is fired upward at a velocity of 25 m/s (assuming g as 10 m/s) at which time and distance the two balls meet ?

A ball is thrown vertically upwards. Which of the following plots represents the speed-time graph of the ball during its flight if the air resistance is not ignored? (Assume that magnitude of resistive force is constant )

What is the relationship between the kinetic energy and potential energy ?

An electrician has two resistive coils. He can obtain the resistance of 3 ohm, 4 ohm, 12 ohm and 16 ohm by keeping them alone and by connecting them in series and parallel. The resistance of these two coils are how much in ohms?

In the pulley system shown in the figure, the radii of the bigger and smaller pulleys are 2 m and 1 m respectively. Find the resultant torque at point O. (Take g=10 m/s2)

The volume of a spherical body is decreased by 10-3% when it is subjected to pressure of 40 atmospheres. Find the bulk modulus of body. (1 atm = 1.01 x 103 N/m2).

Amplitude of electric field in a laser beam of power 4.4 mW with cross-sectional area of 2 mm2 is

The electric field in a region is given by E=(2^i+3^j)×103NC−1 The electric flux through a rectangular surface 10cm×20cm held parallel to the y-z plance is

The sum of the measures of the angles of regular polygen is 2160∘. How many sides does it have ?

An ideal gas is expanding such that PT2=constant. The coefficient volume expansion of the gas is

What is earthing?

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

Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75×10−3 N/m, then the diameter of capillary will be

Which of the following is the unit vector perpendicular to →A and →B?

A car moving at a speed of 30 kilo meters per hour is brought to a halt in 8 metres by applying brakes. If the same car is moving at 60 km. per hour, it can be brought to a halt with same breaking power in

The path followed by a body projected along y-axis is given as by y=√3x−(12)x2, if g = 10 m/s, then the initial velocity of projectile will be – (x and y are in m)

Potentiometer is an ideal voltmeter because:

Calculate the Q-values of the following fusion reactions: (a) 21H+21H→31H+11H (b) 21H+21H→23He+n (c) 21H+31H→24He+n Atomic masses are m(21He)=2.014102 u,m(31He)=3.016049 u,m(32He)=3.016029 u,m(42He)=4.002603 u.

The current through a wire depends on time as i = i0+αt, where i0 = 10 A and α=4As−1. Find the charge crossed through a section of the wire in 10 seconds.

A long cylindrical wire carries a positive charge of linear density 2×10−8Cm−1 . An electron revolves around it in a circular path under the influence of the attractive electrostatic force. Find the kinetic energy of the electron . Note that it is independent of the radius.

The density of a gas at temperature 283.2 k is 25 g/cc. At what temperature will its density become 24 g/cc,if the pressure is kept constant?

Four silicon diodes are connected as shown in the figure. Assume the diodes Ω to be ideal. The current through the resistor ‘R’ is

Certain amount of an ideal gas is contained in a closed vessel. The vessel is moving with a constant velcity v. The molecular mass of gas is M. The rise in temperature of the gas when the vessel is suddenly stopped is γ=CP/CV

A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2mms. Find the induced emf in the loop when the radius is 2 cm.

A block, tied between two springs, is in equilibrium. If upper spring is cut then the acceleration of the block just after cut is 6 m/s2 downwards. Now, if instead of upper spring, lower spring is cut, find the acceleration of the block. (take g = 10 m/s2

Two plane mirrors are parallel to each other and an object O is placed between them. The distance (in cm) of the first three images from the mirror M2 after reflection from the mirror M2 will be

A hospital uses an ultrasonic scanner to locate tumors in a tissue. What is the wavelength of ultrasonic sound wave in the tissue if scanner operates at 4.2 MHz and velocity of sound in tissue is 1.7 km/s?

Match the column I with column II

A particle starts from rest and moves with an acceleration of where 't' is in seconds. The velocity of the particle when it is 2 m from the origin is

Water flows in a horizontal tube as shown in figure. The pressure of water changes by 600N/m2 between x and y where the areas of cross section are 3 cm2 and 1.5cm2 respectively. Find the rate of flow of water through the tube.

Two wires are kept tight between the same pair of supports. The tensions in the wire are in the ratio 3:4. Their radii are in the ratio 1:2 and the density are in the ratio 3:4. The ratio of their fundamental frequencies are

A point mass oscillates along the x−axis according to the law x=x0cos(ωt−π/4). If the acceleration of the particle is written as a=Acos(ωt+δ), then

A charged particle is fired at an angle θ to a uniform magnetic field directed along the x–axis. During its motion along a helical path, if the pitch of the helical path is equal to the maximum distance of the particle from the x– axis, then tanθ is equal to

An ice block of volume 4π/3cm^3 is placed in an artificial satellite. When ice melts into water, then its surface area will be, if densities of ice and water are assumed to be same.

Two forces whose magnitudes are in the ratio 3 : 5 give a resultant of 28 N. If the angle between them is 60∘, find the magnitude of each force and report n, where n is the sum of the two forces in newtons.

Please explain the concept of short circuit

The position of the particle is given by x=2t2−4t+4 in m. The average speed of the particle in 6 sec is

What is the current in the circuit shown below

A mass 2 kg supported by a massless string wound around a uniform hollow cylinder of mass 2 kg and radius 1 m. If the string does not slip on the cylinder, then acceleration of mass is -

In the equation ∫dt√2at−t2=axsin−1[ta−1], where 't' is time. The value of x is

What is rolling friction? What is the need of converting sliding friction into rolling friction?

An old man goes for morning walk on a semi-circular track of radius 30 m, if he starts from one end of the track and reaches to other end, the distance covered by the man will be

I read there are n subshella in the nth subshell if n=1 it will be s n=2 it will be s p n=3 it will be s p d n=4 it will be s p d f if n=5 would it will be s p d f s or something else?