50278 + Interview Questions in Physics

1.	96. A meter stick is held vertically with one end on the floor and is allowed to fall . The speed of the other end when it hits the floor assuming that the end at the floor does not slip is (g=9.8m/s2).
Answer» 96. A meter stick is held vertically with one end on the floor and is allowed to fall . The speed of the other end when it hits the floor assuming that the end at the floor does not slip is (g=9.8m/s2).

Discussion

2.	A block of mass 2 kg rests on a rough inclined plane making an angle of 30∘ with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is: (g=9.8 m/s2)
Answer» A block of mass 2 kg rests on a rough inclined plane making an angle of $30^{\circ}$ with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is: $(g = 9.8 m / s^{2})$

Discussion

3.	A particle is moving in a Circle of radius R in Such a way that at any instant the total acceleration maker un angle of 45 degree with radius. Initial speed of the particle is V.The time taken the complete the first arevolution is: a ) 2R / V (1 - e^ -2pi)b) R/ V( 1-e^-2pi)c) R/Vd) 2R/V
Answer» A particle is moving in a Circle of radius R in Such a way that at any instant the total acceleration maker un angle of 45 degree with radius. Initial speed of the particle is V. The time taken the complete the first arevolution is: a ) 2R / V (1 - e^ -2pi) b) R/ V( 1-e^-2pi) c) R/V d) 2R/V

Discussion

4.	AllMS 2015A sphere of radius 25 cm and mass 1 kg is hungby a string of negligible mass and length 40 cm, thentension in the string is:-(1) 10.81 N(2) 18.4 NR(3) 10 N(4) 8 N
Answer» AllMS 2015 A sphere of radius 25 cm and mass 1 kg is hung by a string of negligible mass and length 40 cm, then tension in the string is:- (1) 10.81 N (2) 18.4 N R (3) 10 N (4) 8 N

Discussion

5.	A conductor lies along the z-axis at–1.5≤z≤1.5 m and carries a fixed current of 10.0 A in –^k direction (see figure). For a field →B=3.0×10−4e0.2x^j T, find the power required to move the conductor at a constant speed to x=2.0 m, y=0 m in 5×10–3 s. Assume parallel motion along the x-axis. (Assume e0.4=1.5)
Answer» A conductor lies along the $z$ -axis at $- 1.5 \leq z \leq 1.5 m$ and carries a fixed current of $10.0 A$ in $-^k$ direction (see figure). For a field $\to B = 3.0 \times 10^{- 4} e^{0.2 x}^j T$ , find the power required to move the conductor at a constant speed to $x = 2.0 m$ , $y = 0 m$ in $5 \times 10^{- 3} s$ . Assume parallel motion along the $x$ -axis. (Assume $e^{0.4} = 1.5$ )

Discussion

6.	'a thin stationary ring of radius 1m has a positive charge 10mc uniformly distributed over it . a particle of mass 0.9gm and having a negative charge of 1mc is placed on the axis at a distance of 1cm from the centre of the ring and released then time period would be?
Answer» 'a thin stationary ring of radius 1m has a positive charge 10mc uniformly distributed over it . a particle of mass 0.9gm and having a negative charge of 1mc is placed on the axis at a distance of 1cm from the centre of the ring and released then time period would be?

Discussion

7.	Two bodies of masses m, and m2 are connected by a light string which passes over a frictionless massless pulley. If the pulley is moving upward with uniform acceleration g/2,then tension in the string will be
Answer» Two bodies of masses m, and m2 are connected by a light string which passes over a frictionless massless pulley. If the pulley is moving upward with uniform acceleration g/2,then tension in the string will be

Discussion

8.	A coil of inductance 0.50 H and resistance 100 W is connected to a 240 V, 50 Hz ac supply. (a) What is the maximum current in the coil? (b) What is the time lag between the voltage maximum and the current maximum?
Answer» A coil of inductance 0.50 H and resistance 100 W is connected to a 240 V, 50 Hz ac supply. (a) What is the maximum current in the coil? (b) What is the time lag between the voltage maximum and the current maximum?

Discussion

9.	In a potentiometer arrangement, a cell of emf 1.25 V gives a balancepoint at 35.0 cm length of the wire. If the cell is replaced by anothercell and the balance point shifts to 63.0 cm, what is the emf of thesecond cell?
Answer» In a potentiometer arrangement, a cell of emf 1.25 V gives a balancepoint at 35.0 cm length of the wire. If the cell is replaced by anothercell and the balance point shifts to 63.0 cm, what is the emf of thesecond cell?

Discussion

10.	Two 29Cu64 nuclei almost touch each other. The electronics repulsive energy of the system will be (R0=1 fm)
Answer» Two $_{29} C u^{64}$ nuclei almost touch each other. The electronics repulsive energy of the system will be $(R_{0} = 1 fm)$

Discussion

11.	Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio (rironrcopper) of their radii must be [ Given that specific resistance of iron =1.0×10−7 Ωm and that of copper =1.7×10−8 Ωm ]
Answer» Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio $(\frac{r_{i r o n}}{r_{c o p p e r}})$ of their radii must be [ Given that specific resistance of iron $= 1.0 \times 10^{- 7} Ω m$ and that of copper $= 1.7 \times 10^{- 8} Ω m$ ]

Discussion

12.	Two vectors →a and →b of equal magnitude 2 unit are at an angle of 60∘ to each other. Find the ratio of \|→a+→b\| and \|→a−→b\|
Answer» Two vectors $\to a$ and $\to b$ of equal magnitude $2 unit$ are at an angle of $60^{\circ}$ to each other. Find the ratio of \| $\to a + \to b$ \| and \| $\to a - \to b$ \|

Discussion

13.	Show that the points A,B and C with position vectors, a=3^i−4^j−4^k, b=2^i−^j+^k and c=^i−3^j−5^k respectively, form the vertices of a right angled triangle.
Answer» Show that the points A,B and C with position vectors, $a = 3^i - 4^j - 4^k, b = 2^i -^j +^k a n d c =^i - 3^j - 5^k$ respectively, form the vertices of a right angled triangle.

Discussion

14.	A capacitor of capacitance C, charged to potential difference V is connected to another capacitor of capacitance 3C, charged to potential difference 3V as shown in the figure. The final charges on capacitor of capacitance C and 3C are respectively
Answer» A capacitor of capacitance $C$ , charged to potential difference $V$ is connected to another capacitor of capacitance $3 C$ , charged to potential difference $3 V$ as shown in the figure. The final charges on capacitor of capacitance $C$ and $3 C$ are respectively

Discussion

15.	The fault current in kA for a 100 MVA; 132 kV system. When 3−ϕ fault current is - j5 p.u. is ________(Given answer upto 3 decimals).2.187
Answer» The fault current in kA for a 100 MVA; 132 kV system. When $3 - ϕ$ fault current is - j5 p.u. is ________(Given answer upto 3 decimals). 2.187

Discussion

16.	Find the equivalent capacitance of the infinite ladder shown in the figure between points P & Q.
Answer» Find the equivalent capacitance of the infinite ladder shown in the figure between points $P$ & $Q$ .

Discussion

17.	A small spherical body of radius r is falling under gravity in a viscous medium and due to friction, the medium gets heated. When the body attains terminal velocity, then the rate of heating is proportional to:
Answer» A small spherical body of radius $r$ is falling under gravity in a viscous medium and due to friction, the medium gets heated. When the body attains terminal velocity, then the rate of heating is proportional to:

Discussion

18.	A short bar magnet of magnetic moment 0.4 JT−1 is placed in a uniform magnetic field of 0.16 T. The magnet is in unstable equilibrium when the potential energy is
Answer» A short bar magnet of magnetic moment $0.4 {JT}^{- 1}$ is placed in a uniform magnetic field of $0.16 T$ . The magnet is in unstable equilibrium when the potential energy is

Discussion

19.	On a rough horizontal surface, a body of mass 2 kg is given a velocity of 10 m/s. If the coefficient of friction is 0.2 and g=10 m/s2, the body will stop after covering a distance of
Answer» On a rough horizontal surface, a body of mass 2 kg is given a velocity of 10 m/s. If the coefficient of friction is 0.2 and g=10 $m / s^{2}$ , the body will stop after covering a distance of

Discussion

20.	"An object is moving in certain direction with an acceleration in perpendicular direction".Is this situation possible ?If yes, then how?Elaborate and explain it
Answer» "An object is moving in certain direction with an acceleration in perpendicular direction".Is this situation possible ?If yes, then how?Elaborate and explain it

Discussion

21.	Two infinitely large sheets A and B carrying current in same direction per unit length in A and B are 5 A/m and 10 A/m respectively. Then find the ratio of magnetic field at p and q.
Answer» Two infinitely large sheets $A$ and $B$ carrying current in same direction per unit length in $A$ and $B$ are $5 A/m$ and $10 A/m$ respectively. Then find the ratio of magnetic field at $p$ and $q$ .

Discussion

22.	A machine of mass m =200 kg is supported on two mounts, each of stiffness k =10 kN/m. The machine is subjected to an external force (in N) F(t)=50 cos 5t. Assuming only vertical translatory motion, the magnitude of the dynamic force (in N) transmitted from each mount to the ground is (correct to two decimal places).
Answer» A machine of mass m =200 kg is supported on two mounts, each of stiffness k =10 kN/m. The machine is subjected to an external force (in N) F(t)=50 cos 5t. Assuming only vertical translatory motion, the magnitude of the dynamic force (in N) transmitted from each mount to the ground is (correct to two decimal places).

Discussion

23.	The maximum amplitude of an AM wave is found to be 15 V while its minimum amplitude is found to be 3 V. the modulation index is
Answer» The maximum amplitude of an AM wave is found to be 15 V while its minimum amplitude is found to be 3 V. the modulation index is

Discussion

24.	a shell is fired vertically upwards with a velocity v_1 from a trolley moving horizontally with velocity v_2 . a person on the ground observes the motion of the shell as a parabola ,whose horizontal range i
Answer» a shell is fired vertically upwards with a velocity v_1 from a trolley moving horizontally with velocity v_2 . a person on the ground observes the motion of the shell as a parabola ,whose horizontal range i

Discussion

25.	From a uniform disk of radius R, a circular hole of radius R/2 is cut out. The centre of the hole is at R/2 from the centre of the original disc. Locate the centre of gravity of the resulting flat body.
Answer» From a uniform disk of radius R, a circular hole of radius R/2 is cut out. The centre of the hole is at R/2 from the centre of the original disc. Locate the centre of gravity of the resulting flat body.

Discussion

26.	A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension =0.05 Nm−1, density =667 kg m−3 ) which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interface (from opp. sides of the capillary) make an angle of 60∘ with one another. Then h is close to (g=10 ms−2).
Answer» A capillary tube made of glass of radius $0.15 mm$ is dipped vertically in a beaker filled with methylene iodide (surface tension $= 0.05 {Nm}^{- 1}$ , density $= 667 {kg m}^{- 3}$ ) which rises to height $h$ in the tube. It is observed that the two tangents drawn from liquid-glass interface (from opp. sides of the capillary) make an angle of $60^{\circ}$ with one another. Then $h$ is close to ( $g = 10 {ms}^{- 2}$ ).

Discussion

27.	The acceleration-time graph for a particle moving in a straight line is as shown in the figure. Change in the velocity of the particle from t=0 to t=6 s is
Answer» The acceleration-time graph for a particle moving in a straight line is as shown in the figure. Change in the velocity of the particle from $t = 0$ to $t = 6 s$ is

Discussion

28.	A current carrying closed loop is placed in a plane of uniform magnetic field B. If F and τ are the net force and net torque acting on the loop, then which of the following is correct? 1)F=0, τ=0 2)F=0, τ≠0 3)F≠0, τ=0 4)F≠0, τ≠0
Answer» A current carrying closed loop is placed in a plane of uniform magnetic field B. If F and τ are the net force and net torque acting on the loop, then which of the following is correct? 1)F=0, τ=0 2)F=0, τ≠0 3)F≠0, τ=0 4)F≠0, τ≠0

Discussion

29.	4 identical rods each of mass m and length L are joined to form a square .find moment of inertia about the x axis.
Answer» 4 identical rods each of mass m and length L are joined to form a square .find moment of inertia about the x axis.

Discussion

30.	what is voltage sensitivity of galvanometer?
Answer» what is voltage sensitivity of galvanometer?

Discussion

31.	Find the second orderderivatives of the function.
Answer» Find the second order derivatives of the function.

31.

Find the second orderderivatives of the function.

Answer»

Find the second order
derivatives of the function.

Discussion

32.	Inside a uniform sphere of density ρ there is a spherical cavity whose centre is at a position vector →l from the centre of the sphere. Find the strength of gravitational field inside the cavity.
Answer» Inside a uniform sphere of density $ρ$ there is a spherical cavity whose centre is at a position vector $\to l$ from the centre of the sphere. Find the strength of gravitational field inside the cavity.

Discussion

33.	The equation of an equipotential line in an electric field is y=2x, then the electric field strength vector at (1,2) may be :
Answer» The equation of an equipotential line in an electric field is $y = 2 x$ , then the electric field strength vector at $(1, 2)$ may be :

Discussion

34.	Calculate the stress developed inside a tooth cavity filled with copper when hot tea at temperature of 57 ∘C is drunk. You can take body (tooth) temperature to be 37 ∘C. Coefficient of linear expansion α=1.7×(10−5) ∘C−1 and bulk modulus for copper =140×109 N/m2.
Answer» Calculate the stress developed inside a tooth cavity filled with copper when hot tea at temperature of $57^{\circ} C$ is drunk. You can take body (tooth) temperature to be $37^{\circ} C$ . Coefficient of linear expansion $α = 1 .7 \times (10^{- 5})^{\circ} C^{- 1}$ and bulk modulus for copper $= 140 \times 10^{9} {N/m}^{2}$ .

Discussion

35.	Magnifying power of a telescope is 40 in case when the final image is formed at infinity. Find its maximum magnifying power, if focal length of eyepiece is 6.25 cm.
Answer» Magnifying power of a telescope is $40$ in case when the final image is formed at infinity. Find its maximum magnifying power, if focal length of eyepiece is $6.25 cm$ .

Discussion

36.	121.A air bubble inside a glass slab appears to be 6cm deep when viewed from one side and 4cm deep when viewed from the opposite side. If refractive index of glass is 1.5,then the thickness of the slab is?
Answer» 121.A air bubble inside a glass slab appears to be 6cm deep when viewed from one side and 4cm deep when viewed from the opposite side. If refractive index of glass is 1.5,then the thickness of the slab is?

Discussion

37.	50. How the potential greater than 1.1 v is able to change the direction of current in Zn\|Zn2+\|\|Cu2+\|Cu
Answer» 50. How the potential greater than 1.1 v is able to change the direction of current in Zn\|Zn2+\|\|Cu2+\|Cu

Discussion

38.	An object is moving with constant acceleration it's velocity is 48m per sec at the end of 10 second and becomes 68m per sec at the end of15 sec what would be the distance traveled by object in 15 second.
Answer» An object is moving with constant acceleration it's velocity is 48m per sec at the end of 10 second and becomes 68m per sec at the end of15 sec what would be the distance traveled by object in 15 second.

Discussion

39.	If \|→a\|=3 and \|→b\|=2, then the value of the expression (2\|→a×→b\|)2+(2\|→a⋅→b\|)2 is _____
Answer» If $\| \to a \| = 3$ and $\| \to b \| = 2,$ then the value of the expression $(2 \| \to a \times \to b \|)^{2} + (2 \| \to a \cdot \to b \|)^{2}$ is _____

Discussion

40.	Which of the following nuclei shown in the graph is light and stable?
Answer» Which of the following nuclei shown in the graph is light and stable?

Discussion

41.	Which of the given 2 vectors are negative of each other?
Answer» Which of the given 2 vectors are negative of each other?

41.

Which of the given 2 vectors are negative of each other?

Answer»

Which of the given 2 vectors are negative of each other?

Discussion

42.	If π∫0(sin3x)⋅e−sin2xdx=α−βe1∫0√t etdt, then α+β is equal to
Answer» If $π \int 0 ({sin}^{3} x) \cdot e^{- {sin}^{2} x} d x = α - \frac{β}{e} 1 \int 0 \sqrt{t} e^{t} d t$ , then $α + β$ is equal to

Discussion

43.	force acting on a particle is 5N .if units of length and time are doubled and unit of mass is halved then find the numerical value of force in the new system of units
Answer» force acting on a particle is 5N .if units of length and time are doubled and unit of mass is halved then find the numerical value of force in the new system of units

Discussion

44.	A boy drops a ball from rest which reaches the ground in 2.1 s. Find the maximum height from where theball is dropped to appropriate significant figures.\lbrack given g = 9.8 ms2
Answer» A boy drops a ball from rest which reaches the ground in 2.1 s. Find the maximum height from where theball is dropped to appropriate significant figures.\lbrack given g = 9.8 ms2

Discussion

45.	A rabbit runs across a parking lot on which a set of coordinate axes has, strangely enough, been drawn.The coordinates(meters) of the rabbit's position as function of time t(seconds) are given byx(t)=−t22+5t+20 And y(t)=t2−10t+30 (a)At t=10s, what is the rabbot's position vector →r in unit-vector notation and in magnitude-angle notation?
Answer» A rabbit runs across a parking lot on which a set of coordinate axes has, strangely enough, been drawn. The coordinates(meters) of the rabbit's position as function of time t(seconds) are given by $x (t) = - \frac{t^{2}}{2} + 5 t + 20 A n d y (t) = t^{2} - 10 t + 30$ (a)At t=10s, what is the rabbot's position vector $\to r$ in unit-vector notation and in magnitude-angle notation?

45.

A rabbit runs across a parking lot on which a set of coordinate axes has, strangely enough, been drawn.The coordinates(meters) of the rabbit's position as function of time t(seconds) are given byx(t)=−t22+5t+20 And y(t)=t2−10t+30 (a)At t=10s, what is the rabbot's position vector →r in unit-vector notation and in magnitude-angle notation?

Answer»

A rabbit runs across a parking lot on which a set of coordinate axes has, strangely enough, been drawn.

The coordinates(meters) of the rabbit's position as function of time t(seconds) are given by

$x (t) = - \frac{t^{2}}{2} + 5 t + 20 A n d y (t) = t^{2} - 10 t + 30$

(a)At t=10s, what is the rabbot's position vector $\to r$ in unit-vector notation and in magnitude-angle notation?

Discussion

46.	A radio can tune in to any station in the 7.5 MHz to 12 MHz band.What is the corresponding wavelength band?
Answer» A radio can tune in to any station in the 7.5 MHz to 12 MHz band.What is the corresponding wavelength band?

Discussion

47.	A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s. Find the linear speed of (a) a point on the rim, (b) the middle point of a radius.
Answer» A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s. Find the linear speed of (a) a point on the rim, (b) the middle point of a radius.

47.

A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s. Find the linear speed of (a) a point on the rim, (b) the middle point of a radius.

Answer»

A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s. Find the linear speed of

(a) a point on the rim,

(b) the middle point of a radius.

Discussion

48.	A bullet of mass 10g travelling horizontally with a velocity of 150 m/s striks a stationary wooden block and comes to rest in 0.03s. Calculate distance of penetration of bullet into the block. Also, calculate the magnitude of the force exerted by the wooden block on the bullet.
Answer» A bullet of mass 10g travelling horizontally with a velocity of 150 m/s striks a stationary wooden block and comes to rest in 0.03s. Calculate distance of penetration of bullet into the block. Also, calculate the magnitude of the force exerted by the wooden block on the bullet.

Discussion

49.	Ship A is sailing towards north-east with velocity →v=30^i+50^j kmh, where ^i points east and ^j north. Ship B is at a distance of 80 km east and 150 km north of ship A and is sailing towards west at 10 kmh. A will be at minimum distance from B in n hours. Report n. Answer upto 1 decimal place.
Answer» Ship A is sailing towards north-east with velocity $\to v = 30^i + 50^j \frac{k m}{h}$ , where $^i$ points east and $^j$ north. Ship B is at a distance of 80 km east and 150 km north of ship A and is sailing towards west at 10 $\frac{k m}{h}$ . A will be at minimum distance from B in n hours. Report n. Answer upto 1 decimal place.

Discussion

50.	A particle is moving in a circle of radius r at o with constant speed v the change in velocity moving from A to B is (angle AOB = 40 degree)
Answer» A particle is moving in a circle of radius r at o with constant speed v the change in velocity moving from A to B is (angle AOB = 40 degree)

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

96. A meter stick is held vertically with one end on the floor and is allowed to fall . The speed of the other end when it hits the floor assuming that the end at the floor does not slip is (g=9.8m/s2).

A block of mass 2 kg rests on a rough inclined plane making an angle of 30∘ with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is: (g=9.8 m/s2)

A particle is moving in a Circle of radius R in Such a way that at any instant the total acceleration maker un angle of 45 degree with radius. Initial speed of the particle is V.The time taken the complete the first arevolution is: a ) 2R / V (1 - e^ -2pi)b) R/ V( 1-e^-2pi)c) R/Vd) 2R/V

AllMS 2015A sphere of radius 25 cm and mass 1 kg is hungby a string of negligible mass and length 40 cm, thentension in the string is:-(1) 10.81 N(2) 18.4 NR(3) 10 N(4) 8 N

'a thin stationary ring of radius 1m has a positive charge 10mc uniformly distributed over it . a particle of mass 0.9gm and having a negative charge of 1mc is placed on the axis at a distance of 1cm from the centre of the ring and released then time period would be?

Two bodies of masses m, and m2 are connected by a light string which passes over a frictionless massless pulley. If the pulley is moving upward with uniform acceleration g/2,then tension in the string will be

A coil of inductance 0.50 H and resistance 100 W is connected to a 240 V, 50 Hz ac supply. (a) What is the maximum current in the coil? (b) What is the time lag between the voltage maximum and the current maximum?

In a potentiometer arrangement, a cell of emf 1.25 V gives a balancepoint at 35.0 cm length of the wire. If the cell is replaced by anothercell and the balance point shifts to 63.0 cm, what is the emf of thesecond cell?

Two 29Cu64 nuclei almost touch each other. The electronics repulsive energy of the system will be (R0=1 fm)

Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio (rironrcopper) of their radii must be [ Given that specific resistance of iron =1.0×10−7 Ωm and that of copper =1.7×10−8 Ωm ]

Two vectors →a and →b of equal magnitude 2 unit are at an angle of 60∘ to each other. Find the ratio of |→a+→b| and |→a−→b|

Show that the points A,B and C with position vectors, a=3^i−4^j−4^k, b=2^i−^j+^k and c=^i−3^j−5^k respectively, form the vertices of a right angled triangle.

A capacitor of capacitance C, charged to potential difference V is connected to another capacitor of capacitance 3C, charged to potential difference 3V as shown in the figure. The final charges on capacitor of capacitance C and 3C are respectively

The fault current in kA for a 100 MVA; 132 kV system. When 3−ϕ fault current is - j5 p.u. is ________(Given answer upto 3 decimals).2.187

Find the equivalent capacitance of the infinite ladder shown in the figure between points P &amp; Q.

A small spherical body of radius r is falling under gravity in a viscous medium and due to friction, the medium gets heated. When the body attains terminal velocity, then the rate of heating is proportional to:

A short bar magnet of magnetic moment 0.4 JT−1 is placed in a uniform magnetic field of 0.16 T. The magnet is in unstable equilibrium when the potential energy is

On a rough horizontal surface, a body of mass 2 kg is given a velocity of 10 m/s. If the coefficient of friction is 0.2 and g=10 m/s2, the body will stop after covering a distance of

"An object is moving in certain direction with an acceleration in perpendicular direction".Is this situation possible ?If yes, then how?Elaborate and explain it

Two infinitely large sheets A and B carrying current in same direction per unit length in A and B are 5 A/m and 10 A/m respectively. Then find the ratio of magnetic field at p and q.

The maximum amplitude of an AM wave is found to be 15 V while its minimum amplitude is found to be 3 V. the modulation index is

a shell is fired vertically upwards with a velocity v_1 from a trolley moving horizontally with velocity v_2 . a person on the ground observes the motion of the shell as a parabola ,whose horizontal range i

From a uniform disk of radius R, a circular hole of radius R/2 is cut out. The centre of the hole is at R/2 from the centre of the original disc. Locate the centre of gravity of the resulting flat body.

The acceleration-time graph for a particle moving in a straight line is as shown in the figure. Change in the velocity of the particle from t=0 to t=6 s is

A current carrying closed loop is placed in a plane of uniform magnetic field B. If F and τ are the net force and net torque acting on the loop, then which of the following is correct? 1)F=0, τ=0 2)F=0, τ≠0 3)F≠0, τ=0 4)F≠0, τ≠0

4 identical rods each of mass m and length L are joined to form a square .find moment of inertia about the x axis.

what is voltage sensitivity of galvanometer?

Find the second orderderivatives of the function.

Inside a uniform sphere of density ρ there is a spherical cavity whose centre is at a position vector →l from the centre of the sphere. Find the strength of gravitational field inside the cavity.

The equation of an equipotential line in an electric field is y=2x, then the electric field strength vector at (1,2) may be :

Calculate the stress developed inside a tooth cavity filled with copper when hot tea at temperature of 57 ∘C is drunk. You can take body (tooth) temperature to be 37 ∘C. Coefficient of linear expansion α=1.7×(10−5) ∘C−1 and bulk modulus for copper =140×109 N/m2.

Magnifying power of a telescope is 40 in case when the final image is formed at infinity. Find its maximum magnifying power, if focal length of eyepiece is 6.25 cm.

121.A air bubble inside a glass slab appears to be 6cm deep when viewed from one side and 4cm deep when viewed from the opposite side. If refractive index of glass is 1.5,then the thickness of the slab is?

50. How the potential greater than 1.1 v is able to change the direction of current in Zn|Zn2+||Cu2+|Cu

An object is moving with constant acceleration it's velocity is 48m per sec at the end of 10 second and becomes 68m per sec at the end of15 sec what would be the distance traveled by object in 15 second.

If |→a|=3 and |→b|=2, then the value of the expression (2|→a×→b|)2+(2|→a⋅→b|)2 is _____

Which of the following nuclei shown in the graph is light and stable?

Which of the given 2 vectors are negative of each other?

If π∫0(sin3x)⋅e−sin2xdx=α−βe1∫0√t etdt, then α+β is equal to

force acting on a particle is 5N .if units of length and time are doubled and unit of mass is halved then find the numerical value of force in the new system of units

A boy drops a ball from rest which reaches the ground in 2.1 s. Find the maximum height from where theball is dropped to appropriate significant figures.\lbrack given g = 9.8 ms2

A radio can tune in to any station in the 7.5 MHz to 12 MHz band.What is the corresponding wavelength band?

A disc of radius 10 cm is rotating about its axis at an angular speed of 20 rad/s. Find the linear speed of (a) a point on the rim, (b) the middle point of a radius.

A bullet of mass 10g travelling horizontally with a velocity of 150 m/s striks a stationary wooden block and comes to rest in 0.03s. Calculate distance of penetration of bullet into the block. Also, calculate the magnitude of the force exerted by the wooden block on the bullet.

Ship A is sailing towards north-east with velocity →v=30^i+50^j kmh, where ^i points east and ^j north. Ship B is at a distance of 80 km east and 150 km north of ship A and is sailing towards west at 10 kmh. A will be at minimum distance from B in n hours. Report n. Answer upto 1 decimal place.

A particle is moving in a circle of radius r at o with constant speed v the change in velocity moving from A to B is (angle AOB = 40 degree)

Find the equivalent capacitance of the infinite ladder shown in the figure between points P & Q.