50278 + Interview Questions in Physics

1.	Calculate the value of V0 and I if the Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit.
Answer» Calculate the value of $V_{0}$ and $I$ if the $S i$ diode and the $G e$ diode start conducting at $0.7 V$ and $0.3 V$ respectively, in the given circuit.

Discussion

2.	A rectangular block of mass m and area of cross-section A floats in a liquid of density ρ. If it is given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then,
Answer» A rectangular block of mass $m$ and area of cross-section $A$ floats in a liquid of density $ρ$ . If it is given a small vertical displacement from equilibrium it undergoes oscillation with a time period $T$ . Then,

Discussion

3.	A ball is thrown upward from the ground with an initial speed u . The ball is at height 80 m at two times . The time interval being 6 s . Find u ?
Answer» A ball is thrown upward from the ground with an initial speed u . The ball is at height 80 m at two times . The time interval being 6 s . Find u ?

Discussion

4.	If the degrees of freedom of a gas molecule be f, then the ratio of two specific heat capacities CPCV is given by
Answer» If the degrees of freedom of a gas molecule be f, then the ratio of two specific heat capacities $\frac{C_{P}}{C_{V}}$ is given by

Discussion

5.	A thermodynamic cycle with an ideal gas as working fluid is shown below.If the specific heats of the working fluid are constant and the value of specific heat ratio γ is 1.4, the thermal efficiency (in %) of the cycle is
Answer» A thermodynamic cycle with an ideal gas as working fluid is shown below. If the specific heats of the working fluid are constant and the value of specific heat ratio $γ$ is $1.4$ , the thermal efficiency $(in %)$ of the cycle is

Discussion

6.	31 Let tangent at a point P on the curve meet the x axis at T if OP=PT Find the equation of family of curves. (O is the origin)
Answer» 31 Let tangent at a point P on the curve meet the x axis at T if OP=PT Find the equation of family of curves. (O is the origin)

Discussion

7.	What is the pressure due to a thrust of 800 N acting on an area of 2 m2?
Answer» What is the pressure due to a thrust of 800 N acting on an area of $2 m^{2}$ ?

Discussion

8.	Assume gravitational potential energy ‘U′ at ground level to be zero. All objects are made up of same material. UP= Gravitational potential energy of solid sphere UQ= Gravitational potential energy of solid cube US= Gravitational potential energy of solid cylinder
Answer» Assume gravitational potential energy $‘ U^{'}$ at ground level to be zero. All objects are made up of same material. $U_{P} =$ Gravitational potential energy of solid sphere $U_{Q} =$ Gravitational potential energy of solid cube $U_{S} =$ Gravitational potential energy of solid cylinder

Discussion

9.	A rod of mass 'M' and length 'L' is placed on frictionless horizontal surface. Rod is given an angular velocity ω0 as shown in figure. When rod rotates by 90∘, it hits a stationary hinge and gets attached to it. New angular velocity is ω such that ω=nω0. Here n is . (Answer upto two digits after the decimal point.)
Answer» A rod of mass 'M' and length 'L' is placed on frictionless horizontal surface. Rod is given an angular velocity $ω_{0}$ as shown in figure. When rod rotates by $90^{\circ}$ , it hits a stationary hinge and gets attached to it. New angular velocity is $ω$ such that $ω = n ω_{0}$ . Here n is . (Answer upto two digits after the decimal point.)

Discussion

10.	The specific heat of an ideal gas is
Answer» The specific heat of an ideal gas is

10.

The specific heat of an ideal gas is

Answer»

The specific heat of an ideal gas is

Discussion

11.	A circular coil of radius 10 cm is placed in a uniform magnetic field of 3.0×10–5 T with its plane perpendicular to the field initially. It is rotated at constant angular speed about an axis along the diameter of the coil and perpendicular to the magnetic field so that it undergoes half of the rotation in 0.2 s. The maximum value of EMF induced (in μV) in the coil will be close to the integer
Answer» A circular coil of radius $10 cm$ is placed in a uniform magnetic field of $3.0 \times 10^{- 5} T$ with its plane perpendicular to the field initially. It is rotated at constant angular speed about an axis along the diameter of the coil and perpendicular to the magnetic field so that it undergoes half of the rotation in $0.2 s$ . The maximum value of $E M F$ induced $(in μ V)$ in the coil will be close to the integer

Discussion

12.	Consider regular polygons with number of sides n=3,4,5....... as shown in the figure. The center of mass of all the polygons is at height h from the ground. They roll on a horizontal surface about the leading vertex without slipping and sliding as depicted. The maximum increase in height of the locus of the center of mass for each polygon is Δ. Then Δ depends on n and h as
Answer» Consider regular polygons with number of sides $n = 3, 4, 5.......$ as shown in the figure. The center of mass of all the polygons is at height $h$ from the ground. They roll on a horizontal surface about the leading vertex without slipping and sliding as depicted. The maximum increase in height of the locus of the center of mass for each polygon is $Δ$ . Then $Δ$ depends on $n$ and $h$ as

Discussion

13.	What is the order (power order)of electron releasing and withdrawing groups?
Answer» What is the order (power order)of electron releasing and withdrawing groups?

Discussion

14.	If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed:
Answer» If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed:

Discussion

15.	If length of a wire increases by 0.1% due to stretching, the percentage increase in its resistance will be (Assume cross sectional area as constant)
Answer» If length of a wire increases by $0.1 %$ due to stretching, the percentage increase in its resistance will be (Assume cross sectional area as constant)

Discussion

16.	A ball is dropped vertically from a height d above the ground and bounces up vertically to height d2. Neglecting subsequent motion and air resistance, its velocity v varies with height h above the ground as
Answer» A ball is dropped vertically from a height $d$ above the ground and bounces up vertically to height $\frac{d}{2}$ . Neglecting subsequent motion and air resistance, its velocity $v$ varies with height $h$ above the ground as

Discussion

17.	Given →F=(xy2)^i+(x2y)^jN. The work done by →F when a particle is taken along the semicircular path OAB where the coordinates of B are (4,0) is
Answer» Given $\to F = (x y^{2})^i + (x^{2} y)^j N$ . The work done by $\to F$ when a particle is taken along the semicircular path OAB where the coordinates of B are (4,0) is

17.

Given →F=(xy2)^i+(x2y)^jN. The work done by →F when a particle is taken along the semicircular path OAB where the coordinates of B are (4,0) is

Answer»

Given $\to F = (x y^{2})^i + (x^{2} y)^j N$ . The work done by $\to F$ when a particle is taken along the semicircular path OAB where the coordinates of B are (4,0) is

Discussion

18.	A uniform rod of mass M and length is hanging from its central point as shown. A small ball of equal mass M is attached to the lower end. Time period of small oscillation of the rod is
Answer» A uniform rod of mass M and length is hanging from its central point as shown. A small ball of equal mass M is attached to the lower end. Time period of small oscillation of the rod is

Discussion

19.	Calculate the inductance of a solenoid containing 200 turns, a length of 25 cm and an area of cross section of 8 cm2.
Answer» Calculate the inductance of a solenoid containing 200 turns, a length of 25 cm and an area of cross section of $8 c m^{2}$ .

Discussion

20.	A uniform rod of length l is rotated about its end and it has a moment of inertia α kg m2. What is the moment of inertia of a rod about a point l4 away from the center?
Answer» A uniform rod of length $l$ is rotated about its end and it has a moment of inertia $α k g m^{2}$ . What is the moment of inertia of a rod about a point $\frac{l}{4}$ away from the center?

Discussion

21.	A steel rod is having a radius of 10 mm and length 1.0 m. A force of 100 kN is used to stretch it along its length. If the Young's modulus of steel is 2×1011 Nm−2, then the strain in the rod will be
Answer» A steel rod is having a radius of $10 mm$ and length $1.0 m$ . A force of $100 kN$ is used to stretch it along its length. If the Young's modulus of steel is $2 \times 10^{11} {Nm}^{- 2}$ , then the strain in the rod will be

Discussion

22.	The radius of first Bohr orbit of hydrogen atom is 0.53 Å . Then the radius of first Bohr orbit of mesonic atom (negative meson has mass 207 times that of electron but same charge) is:
Answer» The radius of first Bohr orbit of hydrogen atom is $0.53 Å$ . Then the radius of first Bohr orbit of mesonic atom (negative meson has mass $207$ times that of electron but same charge) is:

Discussion

23.	Find the number of spectral lines in UV region when the electron jumps from 6------>2
Answer» Find the number of spectral lines in UV region when the electron jumps from 6------>2

Discussion

24.	The velocity of a particle is given by v vector equals to 3 i cap plus 6 t j cap metre per second ,where t is in seconds the equation of trajectory of particle is
Answer» The velocity of a particle is given by v vector equals to 3 i cap plus 6 t j cap metre per second ,where t is in seconds the equation of trajectory of particle is

Discussion

25.	The work function of Ceasium is 2.14 electron volt. Find the wavelength of the incident light if the photo current is brought to zero by a stopping potential of 0.6 volt.
Answer» The work function of Ceasium is 2.14 electron volt. Find the wavelength of the incident light if the photo current is brought to zero by a stopping potential of 0.6 volt.

Discussion

26.	Along straight horizontal cable carries a current of 2.5 A in thedirection 10º south of west to 10°north of east. The magnetic meridian of the place happens to be 10ºwest of the geographic meridian. The earth’s magnetic field atthe location is 0.33 G, and the angle of dip is zero. Locate the lineof neutral points (ignore the thickness of the cable). (At neutralpoints, magnetic field due to acurrent-carrying cable is equal and opposite to the horizontalcomponent of earth’s magnetic field.)
Answer» A long straight horizontal cable carries a current of 2.5 A in the direction 10º south of west to 10° north of east. The magnetic meridian of the place happens to be 10º west of the geographic meridian. The earth’s magnetic field at the location is 0.33 G, and the angle of dip is zero. Locate the line of neutral points (ignore the thickness of the cable). (At neutral points, magnetic field due to a current-carrying cable is equal and opposite to the horizontal component of earth’s magnetic field.)

Discussion

27.	A wire of length 2L, is made by joining two wires A and B of same length but different radii r and 2r and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is p and that in B is q, then the ratio p:q is
Answer» A wire of length $2 L$ , is made by joining two wires A and B of same length but different radii $r$ and $2 r$ and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is $p$ and that in B is $q$ , then the ratio $p : q$ is

Discussion

28.	A 2 μF capacitor is charged as shown in figure. The percentage of its stored energy dissipated after switch S is turned to position 2 is (8μF is the capacitance of air-filled parallel plate capacitor):
Answer» A $2 μ F$ capacitor is charged as shown in figure. The percentage of its stored energy dissipated after switch $S$ is turned to position $2$ is $(8 μ F$ is the capacitance of air-filled parallel plate capacitor $)$ :

Discussion

29.	A plane mirror is placed at the bottom of the tank containing a liquid of refractive index μ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid sees P and its image in the mirror. The apparent distance between these two will be
Answer» A plane mirror is placed at the bottom of the tank containing a liquid of refractive index $μ$ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid sees P and its image in the mirror. The apparent distance between these two will be

Discussion

30.	The curvature radii of a concavo-convex glass lens are 20 cm and 60 cm. The convex surface of the lens is silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is (μ of glass =1.5,μ of water =4/3)
Answer» The curvature radii of a concavo-convex glass lens are $20 c m$ and $60 c m$ . The convex surface of the lens is silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is $(μ of glass = 1.5, μ of water = 4 / 3)$

Discussion

31.	The figure shows a network of currents. The current i will be
Answer» The figure shows a network of currents. The current $i$ will be

Discussion

32.	A body is moving with a velocity 5 m/s and an acceleration of 10 m/s2. Which of these are correct?
Answer» A body is moving with a velocity 5 m/s and an acceleration of 10 m/ $s^{2}$ . Which of these are correct?

Discussion

33.	If the voltage across a bulb rated 220 V−100 W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is
Answer» If the voltage across a bulb rated $220 V - 100 W$ drops by $2.5 %$ of its rated value, the percentage of the rated value by which the power would decrease is

Discussion

34.	The time taken by current to reach thecurrent is given by I=\sqrt1 /2 sin 100root mean square value from t 0 is t then the value of t is(2) 250(1) 1200(4) 800(3) 200
Answer» The time taken by current to reach thecurrent is given by I=\sqrt1 /2 sin 100root mean square value from t 0 is t then the value of t is(2) 250(1) 1200(4) 800(3) 200

Discussion

35.	85. In a gravity free space,a man of mass M standing at a height h above the floor,throws a ball of mass m striaght down with a speed u ,when the ball reaches the floor,the distance of the man above the floor will be a)h(1+m/M) b)h(1+M/m) c)h d)(m/M)h
Answer» 85. In a gravity free space,a man of mass M standing at a height h above the floor,throws a ball of mass m striaght down with a speed u ,when the ball reaches the floor,the distance of the man above the floor will be a)h(1+m/M) b)h(1+M/m) c)h d)(m/M)h

Discussion

36.	A man wishes to cross a river in a boat. If he crosses the river in minimum time he takes 10 minutes with a drift of 120 m. If he crosses the river taking the shortest route, he takes 12.5 minutes, find the velocity of the boat with respect to water.
Answer» A man wishes to cross a river in a boat. If he crosses the river in minimum time he takes $10 minutes$ with a drift of $120 m$ . If he crosses the river taking the shortest route, he takes $12.5 minutes$ , find the velocity of the boat with respect to water.

Discussion

37.	ntwhy does a capacitor store more charge at a given potential diffrence when a dielectric is filled in between the platesn
Answer» ntwhy does a capacitor store more charge at a given potential diffrence when a dielectric is filled in between the platesn

Discussion

38.	A projectile is fired horizontally from a height of19.62 cm from the ground and reaches the groundat a horizontal distance of 49 m. The initial velocityis approximately(1) 20.1 m/s(2) 24.52 m/s(3) 28.32 m/s(4) 30.49 m/sian
Answer» A projectile is fired horizontally from a height of19.62 cm from the ground and reaches the groundat a horizontal distance of 49 m. The initial velocityis approximately(1) 20.1 m/s(2) 24.52 m/s(3) 28.32 m/s(4) 30.49 m/sian

Discussion

39.	A radioactive sample, at a certain instant of time, has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (in per minute) is,
Answer» A radioactive sample, at a certain instant of time, has its disintegration rate $5000$ disintegrations per minute. After $5$ minutes, the rate is $1250$ disintegrations per minute. Then, the decay constant (in per minute) is,

Discussion

40.	A bird is flying over a swimming pool at a height of 2 m from the water surface .If the bottom is perfectly plane reflecting surface and depth of swimming pool is 1 m ,then the distance of final image of bird from itself is ? Refractive index of water is 4/3
Answer» A bird is flying over a swimming pool at a height of 2 m from the water surface .If the bottom is perfectly plane reflecting surface and depth of swimming pool is 1 m ,then the distance of final image of bird from itself is ? Refractive index of water is 4/3

Discussion

41.	A solid sphere of density ρ=ρ0(1−r2R2),0<r≤R (where r is the distance from the centre of the sphere) just floats in a liquid. Then, density of the liquid is -
Answer» A solid sphere of density $ρ = ρ_{0} (1 - \frac{r^{2}}{R^{2}}), 0 < r \leq R$ (where $r$ is the distance from the centre of the sphere) just floats in a liquid. Then, density of the liquid is -

Discussion

42.	Choose the correct statement:
Answer» Choose the correct statement:

Discussion

43.	A small air bubble is inside a glass cube of side 15cm.when seeing from the top face, the bubble appears at a distance of 5cm and if seen from the opposite face it appears at 7cm.Refractive index of glass
Answer» A small air bubble is inside a glass cube of side 15cm.when seeing from the top face, the bubble appears at a distance of 5cm and if seen from the opposite face it appears at 7cm.Refractive index of glass

Discussion

44.	58. A car is moving on circular path and take a turn . If r1 and r2 be the reaction on inner and outer wheel respectively than why r2 is greater than r1?
Answer» 58. A car is moving on circular path and take a turn . If r1 and r2 be the reaction on inner and outer wheel respectively than why r2 is greater than r1?

Discussion

45.	An object of height 6 cm is placed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be
Answer» An object of height 6 cm is placed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

Discussion

46.	A particle is performing simple harmonic motion along x− axis with amplitude 4 cm and time period 1.2 sec. The minimum time taken by the particle to move from x=+2 cm to x=+4 cm and back again is given by
Answer» A particle is performing simple harmonic motion along $x -$ axis with amplitude $4 cm$ and time period $1.2 sec$ . The minimum time taken by the particle to move from $x = + 2 cm$ to $x = + 4 cm$ and back again is given by

Discussion

47.	A bullet of mass 50 gm is fired with a velocity of 90 m/s towards a ball of mass 500 gm, initially at rest. When the bullet strikes the ball, it gets embedded into it and the system starts moving. What is the ratio of the kinetic energy of the bullet to the kinetic energy of the (bullet + ball) system?
Answer» A bullet of mass $50 gm$ is fired with a velocity of $90 m/s$ towards a ball of mass $500 gm$ , initially at rest. When the bullet strikes the ball, it gets embedded into it and the system starts moving. What is the ratio of the kinetic energy of the bullet to the kinetic energy of the $(bullet + ball)$ system?

Discussion

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

Discussion

49.	For a prism; A=60∘,n=√73. The minimum possible angle of incidence, so that the light ray is refracted from the second surface is πn; then the value of n is:___
Answer» For a prism; $A = 60^{\circ}, n = \sqrt{\frac{7}{3}}$ . The minimum possible angle of incidence, so that the light ray is refracted from the second surface is $\frac{π}{n}$ ; then the value of n is:___

Discussion

50.	according to the octet rule the compound which contain ionic covalent and coordinate bonds area.CaSO4 b. NH2Cl c.NaNO3 d. all of the above
Answer» according to the octet rule the compound which contain ionic covalent and coordinate bonds are a.CaSO4 b. NH2Cl c.NaNO3 d. all of the above

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Calculate the value of V0 ​ and I if the Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit.

A rectangular block of mass m and area of cross-section A floats in a liquid of density ρ. If it is given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then,

A ball is thrown upward from the ground with an initial speed u . The ball is at height 80 m at two times . The time interval being 6 s . Find u ?

If the degrees of freedom of a gas molecule be f, then the ratio of two specific heat capacities CPCV is given by

A thermodynamic cycle with an ideal gas as working fluid is shown below.If the specific heats of the working fluid are constant and the value of specific heat ratio γ is 1.4, the thermal efficiency (in %) of the cycle is

31 Let tangent at a point P on the curve meet the x axis at T if OP=PT Find the equation of family of curves. (O is the origin)

What is the pressure due to a thrust of 800 N acting on an area of 2 m2?

Assume gravitational potential energy ‘U′ at ground level to be zero. All objects are made up of same material. UP= Gravitational potential energy of solid sphere UQ= Gravitational potential energy of solid cube US= Gravitational potential energy of solid cylinder

The specific heat of an ideal gas is

What is the order (power order)of electron releasing and withdrawing groups?

If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed:

If length of a wire increases by 0.1% due to stretching, the percentage increase in its resistance will be (Assume cross sectional area as constant)

A ball is dropped vertically from a height d above the ground and bounces up vertically to height d2. Neglecting subsequent motion and air resistance, its velocity v varies with height h above the ground as

Given →F=(xy2)^i+(x2y)^jN. The work done by →F when a particle is taken along the semicircular path OAB where the coordinates of B are (4,0) is

A uniform rod of mass M and length is hanging from its central point as shown. A small ball of equal mass M is attached to the lower end. Time period of small oscillation of the rod is

Calculate the inductance of a solenoid containing 200 turns, a length of 25 cm and an area of cross section of 8 cm2.

A uniform rod of length l is rotated about its end and it has a moment of inertia α kg m2. What is the moment of inertia of a rod about a point l4 away from the center?

A steel rod is having a radius of 10 mm and length 1.0 m. A force of 100 kN is used to stretch it along its length. If the Young's modulus of steel is 2×1011 Nm−2, then the strain in the rod will be

The radius of first Bohr orbit of hydrogen atom is 0.53 Å . Then the radius of first Bohr orbit of mesonic atom (negative meson has mass 207 times that of electron but same charge) is:

Find the number of spectral lines in UV region when the electron jumps from 6------>2

The velocity of a particle is given by v vector equals to 3 i cap plus 6 t j cap metre per second ,where t is in seconds the equation of trajectory of particle is

The work function of Ceasium is 2.14 electron volt. Find the wavelength of the incident light if the photo current is brought to zero by a stopping potential of 0.6 volt.

A wire of length 2L, is made by joining two wires A and B of same length but different radii r and 2r and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is p and that in B is q, then the ratio p:q is

A 2 μF capacitor is charged as shown in figure. The percentage of its stored energy dissipated after switch S is turned to position 2 is (8μF is the capacitance of air-filled parallel plate capacitor):

A plane mirror is placed at the bottom of the tank containing a liquid of refractive index μ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid sees P and its image in the mirror. The apparent distance between these two will be

The curvature radii of a concavo-convex glass lens are 20 cm and 60 cm. The convex surface of the lens is silvered. With the lens horizontal, the concave surface is filled with water. The focal length of the effective mirror is (μ of glass =1.5,μ of water =4/3)

The figure shows a network of currents. The current i will be

A body is moving with a velocity 5 m/s and an acceleration of 10 m/s2. Which of these are correct?

If the voltage across a bulb rated 220 V−100 W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

The time taken by current to reach thecurrent is given by I=\sqrt1 /2 sin 100root mean square value from t 0 is t then the value of t is(2) 250(1) 1200(4) 800(3) 200

85. In a gravity free space,a man of mass M standing at a height h above the floor,throws a ball of mass m striaght down with a speed u ,when the ball reaches the floor,the distance of the man above the floor will be a)h(1+m/M) b)h(1+M/m) c)h d)(m/M)h

A man wishes to cross a river in a boat. If he crosses the river in minimum time he takes 10 minutes with a drift of 120 m. If he crosses the river taking the shortest route, he takes 12.5 minutes, find the velocity of the boat with respect to water.

ntwhy does a capacitor store more charge at a given potential diffrence when a dielectric is filled in between the platesn

A projectile is fired horizontally from a height of19.62 cm from the ground and reaches the groundat a horizontal distance of 49 m. The initial velocityis approximately(1) 20.1 m/s(2) 24.52 m/s(3) 28.32 m/s(4) 30.49 m/sian

A radioactive sample, at a certain instant of time, has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (in per minute) is,

A bird is flying over a swimming pool at a height of 2 m from the water surface .If the bottom is perfectly plane reflecting surface and depth of swimming pool is 1 m ,then the distance of final image of bird from itself is ? Refractive index of water is 4/3

A solid sphere of density ρ=ρ0(1−r2R2),0&lt;r≤R (where r is the distance from the centre of the sphere) just floats in a liquid. Then, density of the liquid is -

Choose the correct statement:

A small air bubble is inside a glass cube of side 15cm.when seeing from the top face, the bubble appears at a distance of 5cm and if seen from the opposite face it appears at 7cm.Refractive index of glass

58. A car is moving on circular path and take a turn . If r1 and r2 be the reaction on inner and outer wheel respectively than why r2 is greater than r1?

An object of height 6 cm is placed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

A particle is performing simple harmonic motion along x− axis with amplitude 4 cm and time period 1.2 sec. The minimum time taken by the particle to move from x=+2 cm to x=+4 cm and back again is given by

For a prism; A=60∘,n=√73. The minimum possible angle of incidence, so that the light ray is refracted from the second surface is πn; then the value of n is:___

according to the octet rule the compound which contain ionic covalent and coordinate bonds area.CaSO4 b. NH2Cl c.NaNO3 d. all of the above

Calculate the value of V0 and I if the Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit.

A solid sphere of density ρ=ρ0(1−r2R2),0<r≤R (where r is the distance from the centre of the sphere) just floats in a liquid. Then, density of the liquid is -