50278 + Interview Questions in Physics Page 43 InterviewSolution

2101.	The current i (in Ampere) in the 2 Ω resistor of the given network is.0
Answer» The current i (in Ampere) in the 2 $Ω$ resistor of the given network is. 0

Discussion

2102.	5. A concave mirror of focal length 20 cm produces an image twice the height of the object. If theimage is real, then the distance of the object from the mirror is(1) 20 cm (2) 60 cm(3) 10 cm (4) 30 cm
Answer» 5. A concave mirror of focal length 20 cm produces an image twice the height of the object. If the image is real, then the distance of the object from the mirror is (1) 20 cm (2) 60 cm (3) 10 cm (4) 30 cm

Discussion

2103.	A horizontal uniform rod of mass ′m′ has its left end hinged to the fixed incline plane, while its right end rests on the top of a uniform cylinder of mass ′m′ which in turn is at rest on the fixed inclined plane as shown. The coefficient of friction between the cylinder and rod, and between the cylinder and inclined plane, is sufficient to keep the cylinder at rest.The magnitude of normal reaction exerted by the rod on the cylinder is
Answer» A horizontal uniform rod of mass $^{'} m^{'}$ has its left end hinged to the fixed incline plane, while its right end rests on the top of a uniform cylinder of mass $^{'} m^{'}$ which in turn is at rest on the fixed inclined plane as shown. The coefficient of friction between the cylinder and rod, and between the cylinder and inclined plane, is sufficient to keep the cylinder at rest. The magnitude of normal reaction exerted by the rod on the cylinder is

Discussion

2104.	four different sets of quantum number for 4 electron are given below : e1= 4,0,0,-1/2 e2 = 3, 1, 1,-1/2 e3 = 3,2,2, +1/2 e4 = 3,0,0, +1/2 THE ORDER OF ENERGY OF E1, E2 , E3 AND E4 IS : a. e1>e2> e3> e4 b. e4 >e3 >e2> e1 c. e3 >e1> e2 >e4 d. e2 >e3 >e4 e1
Answer» four different sets of quantum number for 4 electron are given below : e1= 4,0,0,-1/2 e2 = 3, 1, 1,-1/2 e3 = 3,2,2, +1/2 e4 = 3,0,0, +1/2 THE ORDER OF ENERGY OF E1, E2 , E3 AND E4 IS : a. e1>e2> e3> e4 b. e4 >e3 >e2> e1 c. e3 >e1> e2 >e4 d. e2 >e3 >e4 e1

Discussion

2105.	a parallel plate capacitor with plate area A and separation between the plates d,is charged by a current I.displacement current through a plane surface of area A/3 parallel to plates and drawn symmetrically betwee the plates? i
Answer» a parallel plate capacitor with plate area A and separation between the plates d,is charged by a current I.displacement current through a plane surface of area A/3 parallel to plates and drawn symmetrically betwee the plates? i

Discussion

2106.	3.the potential energy of a particle of.mass 100 g is moving along x axis byU=5x(x-4),where x is in meters .the period of assilation is
Answer» 3.the potential energy of a particle of.mass 100 g is moving along x axis byU=5x(x-4),where x is in meters .the period of assilation is

Discussion

2107.	Oscillations 113 (Simple Harmonic Motion) 9. A particle executes SHM according to equation e x = 10 (cm) cos[2nt ], where t is in second. The magnitude of the velocity of the particle at ts will be (1) 24.7 cm/s 6 (2) 20.5 cm/s (4) 31.4 cm/s (3) 28.3 cm/s Simnle Harmonic Motion and Uniform Circular
Answer» Oscillations 113 (Simple Harmonic Motion) 9. A particle executes SHM according to equation e x = 10 (cm) cos[2nt ], where t is in second. The magnitude of the velocity of the particle at ts will be (1) 24.7 cm/s 6 (2) 20.5 cm/s (4) 31.4 cm/s (3) 28.3 cm/s Simnle Harmonic Motion and Uniform Circular

Discussion

2108.	1.) In scattering experiment, find the distance of closest approach, if a 6 MeV o-particle is used(1) 3.210-16m(3) 4.6 x 10-15 m(2) 2 x 10-14 m(4) 3.210-15 m
Answer» 1.) In scattering experiment, find the distance of closest approach, if a 6 MeV o-particle is used(1) 3.210-16m(3) 4.6 x 10-15 m(2) 2 x 10-14 m(4) 3.210-15 m

Discussion

2109.	A cylindrical vessel of 90cm height is kept filled upto the brim. It has four holes 1,2,3 and 4 which are respectively at heights of 20cm, 30cm, 40cm and 50cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from the holes marked as number
Answer» A cylindrical vessel of 90cm height is kept filled upto the brim. It has four holes 1,2,3 and 4 which are respectively at heights of 20cm, 30cm, 40cm and 50cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from the holes marked as number

2109.

A cylindrical vessel of 90cm height is kept filled upto the brim. It has four holes 1,2,3 and 4 which are respectively at heights of 20cm, 30cm, 40cm and 50cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from the holes marked as number

Answer»

A cylindrical vessel of 90cm height is kept filled upto the brim. It has four holes 1,2,3 and 4 which are respectively at heights of 20cm, 30cm, 40cm and 50cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from the holes marked as number

Discussion

2110.	An aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. Compare its centripetal acceleration with the acceleration due to gravity.
Answer» An aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. Compare its centripetal acceleration with the acceleration due to gravity.

Discussion

2111.	A body of mass 2kg is placed on a smooth horizontal surface .Two forces F1= 20N & F2=10√3N are acting on the body in direction making angle of 30 & 60 to the surface .The reaction of the surface on the body will be a)20Nb)25Nc)5Nd)zero
Answer» A body of mass 2kg is placed on a smooth horizontal surface .Two forces F1= 20N & F2=10√3N are acting on the body in direction making angle of 30 & 60 to the surface .The reaction of the surface on the body will be a)20N b)25N c)5N d)zero

Discussion

2112.	On a 200 km track a train travels the first 50 km at a uniform speed of 40kmper hour how fast the train must travel the next 150km so as to maintain the average speed of 60km per hour
Answer» On a 200 km track a train travels the first 50 km at a uniform speed of 40kmper hour how fast the train must travel the next 150km so as to maintain the average speed of 60km per hour

Discussion

2113.	The velocity vector at a point A varies with time as where a and b are positive cons†an ts. The equation of trajectory of the point would be
Answer» The velocity vector at a point A varies with time as where a and b are positive cons†an ts. The equation of trajectory of the point would be

Discussion

2114.	The energy stored in the magnetic field if current of 5 A produces a magnetic flux of 2×10−3 Wb through a coil of 500 turns is[1 Mark]
Answer» The energy stored in the magnetic field if current of $5 A$ produces a magnetic flux of $2 \times 10^{- 3} Wb$ through a coil of $500$ turns is $[$ 1 Mark $]$

Discussion

2115.	46.A particle is undergoing SHM has the equation x= A sin (wt + Q(fi) ) where x represents the displacement of the particle. The kinetic energy oscillates with time period
Answer» 46.A particle is undergoing SHM has the equation x= A sin (wt + Q(fi) ) where x represents the displacement of the particle. The kinetic energy oscillates with time period

Discussion

2116.	Water from a tap emerges vertically downwards with an initial speed of 1 m/s. The cross-section area of the tap is 10−4 m2 . Assuming that the pressure is constant throughout the stream of water and the flow is steady, what will be the cross-section area of the stream 0.15 m below the tap?
Answer» Water from a tap emerges vertically downwards with an initial speed of $1 m/s$ . The cross-section area of the tap is $10^{- 4} m^{2}$ . Assuming that the pressure is constant throughout the stream of water and the flow is steady, what will be the cross-section area of the stream $0.15 m$ below the tap?

Discussion

2117.	Assuming that the capacitors are uncharged initially, find the charge on each capacitor in steady state.
Answer» Assuming that the capacitors are uncharged initially, find the charge on each capacitor in steady state.

Discussion

2118.	how m uch positive and negative charge is there in a cup of water hoew \xrightarrow{\xrightarrow[{}]{}}
Answer» how m uch positive and negative charge is there in a cup of water hoew \xrightarrow{\xrightarrow[{}]{}}

Discussion

2119.	A metallic wire of length 10 cm , when made into a circular loop of radius R and a current of i A flows through it gives same magnetic moment value as when it is made into a square of side a. The relation between the current passing through the square loop i′ to the current passing through the circular loop are given by i=xi′. Find x.
Answer» A metallic wire of length $10 cm$ , when made into a circular loop of radius $R$ and a current of $i A$ flows through it gives same magnetic moment value as when it is made into a square of side $a$ . The relation between the current passing through the square loop $i^{'}$ to the current passing through the circular loop are given by $i = x i^{'}$ . Find $x$ .

Discussion

2120.	A rod of negligible resistance and of length 3m is being pulled in a uniform vertical magnetic field of magnitude 0.8 T with a speed of 5 m/s. The resistance of circuit is 4Ω and capacitance is 6μF.Initially there is no charge on the capacitor. The current (in A) in circuit when charge on capacitor becomes 24μC is ___
Answer» A rod of negligible resistance and of length 3m is being pulled in a uniform vertical magnetic field of magnitude 0.8 T with a speed of 5 m/s. The resistance of circuit is $4 Ω$ and capacitance is $6 μ F$ .Initially there is no charge on the capacitor. The current (in A) in circuit when charge on capacitor becomes $24 μ C$ is ___

Discussion

2121.	∫(sin x+x2) dx is equal to:
Answer» $\int (sin x + x^{2}) d x$ is equal to:

Discussion

2122.	∫1√sec2x+tan2xdx=log\|sinx+√f(x)\|+C, then which of the following is/are correct?
Answer» $\int \frac{1}{\sqrt{{sec}^{2} x + {tan}^{2} x}} d x = log \| sin x + \sqrt{f (x)} \| + C$ , then which of the following is/are correct?

Discussion

2123.	Moment of inertia I of a solid sphere about an axis parallel to a diameter and at a distance x from its centre of mass varies as
Answer» Moment of inertia $I$ of a solid sphere about an axis parallel to a diameter and at a distance $x$ from its centre of mass varies as

Discussion

2124.	A semicircular rod charged with a charge Q is placed as shown in figure. Radius of the wire is R and the infinitely long line of charge with linear density λ is passing through its centre and perpendicular to the plane of wire. If the force experienced by the semicircular rod is λQxπ2ε0R. Then the value of x is
Answer» A semicircular rod charged with a charge $Q$ is placed as shown in figure. Radius of the wire is $R$ and the infinitely long line of charge with linear density $λ$ is passing through its centre and perpendicular to the plane of wire. If the force experienced by the semicircular rod is $\frac{λ Q}{x π^{2} ε_{0} R}$ . Then the value of $x$ is

Discussion

2125.	A large spherical mass M is fixed at one position and two identical point masses m are kept on a line passing through the centre of M. The point masses are connected by a rigid massless rod of length l and this assembly is free to move along the line connecting them. All three masses interact only through their mutual gravitational interaction. When the point mass nearer to M is at a distance r=3l from M, the tension in the rod is zero for m=k(M288). The value of k is
Answer» A large spherical mass $M$ is fixed at one position and two identical point masses $m$ are kept on a line passing through the centre of $M$ . The point masses are connected by a rigid massless rod of length $l$ and this assembly is free to move along the line connecting them. All three masses interact only through their mutual gravitational interaction. When the point mass nearer to $M$ is at a distance $r = 3 l$ from $M$ , the tension in the rod is zero for $m = k (\frac{M}{288})$ . The value of $k$ is

Discussion

2126.	A tie bar 50mm×8mm is to carry a load of 80 kN. A specimen of the same quality steel of cross -sectional area 250 mm2 was tested in the laboratory. The maximum load carried by the specimen was 125 kN. The factor of safety in the design is.2.5
Answer» A tie bar $50 mm \times 8 mm$ is to carry a load of 80 kN. A specimen of the same quality steel of cross -sectional area $250 m m^{2}$ was tested in the laboratory. The maximum load carried by the specimen was 125 kN. The factor of safety in the design is. 2.5

2126.

A tie bar 50mm×8mm is to carry a load of 80 kN. A specimen of the same quality steel of cross -sectional area 250 mm2 was tested in the laboratory. The maximum load carried by the specimen was 125 kN. The factor of safety in the design is.2.5

Answer»

A tie bar $50 mm \times 8 mm$ is to carry a load of 80 kN. A specimen of the same quality steel of cross -sectional area $250 m m^{2}$ was tested in the laboratory. The maximum load carried by the specimen was 125 kN. The factor of safety in the design is.

2.5

Discussion

2127.	The average time taken by a molecule of oxygen at 300 K to travel a distance equal to the diameter of the earth. (Diameter of earth =12800 km)
Answer» The average time taken by a molecule of oxygen at $300 K$ to travel a distance equal to the diameter of the earth. (Diameter of earth $= 12800 km$ )

Discussion

2128.	why any capictor is fully charged at t
Answer» why any capictor is fully charged at t

Discussion

2129.	The energy required to blow a bubble of radius 4cm & 3cm in the same liquid in the ratio of:(a). 3:4(b). 16:9(c). 64:27(d). 27:64
Answer» The energy required to blow a bubble of radius 4cm & 3cm in the same liquid in the ratio of: (a). 3:4 (b). 16:9 (c). 64:27 (d). 27:64

Discussion

2130.	If a body is dropped with an initiaL veLocity 5 m/s under gravit .What height is covered by it
Answer» If a body is dropped with an initiaL veLocity 5 m/s under gravit .What height is covered by it

Discussion

2131.	a body revolves with a constant speed v in a circular path of radius r the magnitude of its average acceleration during motion between two points in diametrically opposite direction is
Answer» a body revolves with a constant speed v in a circular path of radius r the magnitude of its average acceleration during motion between two points in diametrically opposite direction is

Discussion

2132.	the total no of neutrons present in 54 ml of h2o are? 3na 30na 24na none of thes
Answer» the total no of neutrons present in 54 ml of h2o are? 3na 30na 24na none of thes

Discussion

2133.	a body of mass 5kg is acted upon by a force F=(-3i+4j)N.if its initial velocity at t=0 is v=(6i-12j)m/sec.the time at which it has its velocity along y axis is
Answer» a body of mass 5kg is acted upon by a force F=(-3i+4j)N.if its initial velocity at t=0 is v=(6i-12j)m/sec.the time at which it has its velocity along y axis is

Discussion

2134.	One end of 10 cm long silk thread is fixed to a large vertical surface of a charged nonconducting plate and the other end is fastened to a small ball having a mass of 10 g and a charge of 4.0×10−6C. In equilibrium , the thread makes an angle of 60∘ with the vertical. Find the surface charge density on the plate.
Answer» One end of 10 cm long silk thread is fixed to a large vertical surface of a charged nonconducting plate and the other end is fastened to a small ball having a mass of 10 g and a charge of $4.0 \times 10^{- 6} C .$ In equilibrium , the thread makes an angle of $60^{\circ}$ with the vertical. Find the surface charge density on the plate.

Discussion

2135.	The earth is acted upon by gravitation of sun, even though it does not fall into the sun, why?
Answer» The earth is acted upon by gravitation of sun, even though it does not fall into the sun, why?

Discussion

2136.	As shown in the figure, if the value of rms current is 2.2 A, the power factor of the box is
Answer» As shown in the figure, if the value of $r m s$ current is $2.2 A$ , the power factor of the box is

Discussion

2137.	consider a solid sphere of radius r and mass m which has a charge q distributed uniformly over its volume . The sphere is rotated about a diameter with an angular speed ω. Show that the magnetic moment μ and the angular momentum ι of the sphere are related as μ=qι/2m
Answer» consider a solid sphere of radius r and mass m which has a charge q distributed uniformly over its volume . The sphere is rotated about a diameter with an angular speed ω. Show that the magnetic moment μ and the angular momentum ι of the sphere are related as μ=qι/2m

Discussion

2138.	A uniform chain of mass m hangs from a light pulley, with unewual lengths of the chain hanging from the two sides of pulley the force exerted by moving chain on the pulley is
Answer» A uniform chain of mass m hangs from a light pulley, with unewual lengths of the chain hanging from the two sides of pulley the force exerted by moving chain on the pulley is

Discussion

2139.	In a double-slit experiment, green light (λ=5303 ˚A) falls on a double slit, having a separation of 19.44 μm and a width of 4.05 μm. The number of bright fringes between the first and the second diffraction minima is :
Answer» In a double-slit experiment, green light $(λ = 5303 ˚ A)$ falls on a double slit, having a separation of $19.44 μ m$ and a width of $4.05 μ m$ . The number of bright fringes between the first and the second diffraction minima is :

Discussion

2140.	A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity omega about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is
Answer» A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity omega about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is

Discussion

2141.	The components of a vector along the x and y directions are (n+1) and 1 respectively. If the co-ordinate system is rotated by an angle 60⁰, then the components changes to n and 3. The value of n will be,
Answer» The components of a vector along the x and y directions are (n+1) and 1 respectively. If the co-ordinate system is rotated by an angle 60⁰, then the components changes to n and 3. The value of n will be,

Discussion

2142.	12.Two cars are moving on two perpendicular roads towards a crossing with uniform speed of 72km/h and 36km/h. if fast car blows horn of frequency 300Hz then the frequency of hornr heard by the driver of second car when line joining the cars make 45 degree angle with the roads will be.? speed of sound 330m/s
Answer» 12.Two cars are moving on two perpendicular roads towards a crossing with uniform speed of 72km/h and 36km/h. if fast car blows horn of frequency 300Hz then the frequency of hornr heard by the driver of second car when line joining the cars make 45 degree angle with the roads will be.? speed of sound 330m/s

Discussion

2143.	The linear charge density of a thin rod of length L is given by λ=(λ0x) Coulomb/m,[0≤x<L2] and λ=(λ0x2) Coulomb/m,[L2≤x≤L]. Find the total charge on rod. (x is measure from one end of the rod).
Answer» The linear charge density of a thin rod of length $L$ is given by $λ = (λ_{0} x) Coulomb/m, [0 \leq x < \frac{L}{2}]$ and $λ = (λ_{0} x^{2}) Coulomb/m, [\frac{L}{2} \leq x \leq L]$ . Find the total charge on rod. $(x$ is measure from one end of the rod $)$ .

Discussion

2144.	when dipole is placed in a uniform electric field net force on it is 0 but torque is not 0. but according to formula τ=rFsinθ, as F is 0 so τ should be 0?
Answer» when dipole is placed in a uniform electric field net force on it is 0 but torque is not 0. but according to formula τ=rFsinθ, as F is 0 so τ should be 0?

Discussion

2145.	given that When a particle isprojected from the surface of earth, its mechanicalenergy and angular momentum about centre of earthat all time is constant.A particle of mass m is projected from the surface ofearth with velocity vo at angle theta with horizontal.Suppose h be the maximum height of particle fromsurface of earth and v is its speed at that point then v is equal to(a) Vocos e(theta)(b) > Vo cos e(c)
Answer» given that When a particle is projected from the surface of earth, its mechanical energy and angular momentum about centre of earth at all time is constant. A particle of mass m is projected from the surface of earth with velocity vo at angle theta with horizontal. Suppose h be the maximum height of particle from surface of earth and v is its speed at that point then v is equal to (a) Vocos e(theta) (b) > Vo cos e (c)

Discussion

2146.	A swimmer wishes to cross a 500m wide river flowing at a rate of 2 m/s. His speed with respect to still water is 4 m/s. What angle (in degrees) should the swimmer make with the vertical so that he reaches the exact opposite of the point of his start?
Answer» A swimmer wishes to cross a $500 m$ wide river flowing at a rate of $2 m / s$ . His speed with respect to still water is $4 m / s$ . What angle (in degrees) should the swimmer make with the vertical so that he reaches the exact opposite of the point of his start?

Discussion

2147.	Describe the Parallax method to find out how far a star is?
Answer» Describe the Parallax method to find out how far a star is?

Discussion

2148.	An alternating voltage, of peak value 283 V and of varying frequency, is applied across a series LCR combination in which, R=3 Ω,L=25 mH and C=400 μF. The frequency of the source for which the current and voltage are in phase, is -
Answer» An alternating voltage, of peak value $283 V$ and of varying frequency, is applied across a series LCR combination in which, $R = 3 Ω, L = 25 mH$ and $C = 400 μ F$ . The frequency of the source for which the current and voltage are in phase, is -

Discussion

2149.	Figure 5.17 shows the position-time graph of a body of mass 0.04 kg. Suggest a suitable physical context for this motion. What is the time between two consecutive impulses received by the body ? What is the magnitude of each impulse ?
Answer» Figure 5.17 shows the position-time graph of a body of mass 0.04 kg. Suggest a suitable physical context for this motion. What is the time between two consecutive impulses received by the body ? What is the magnitude of each impulse ?

Discussion

2150.	(a) A monoenergetic electron beam with electron speed of 5.20 × 106m/s is subject to a magnetic field of 1.30 × 10–4 Tnormal to the beam velocity. What is the radius of the circle tracedby the beam, given e/m for electron equals 1.76 × 1011C /kg (b) Is the formula you employ in (a) valid for calculating radius ofthe path of a 20 MeV electron beam? If not, in what way is itmodified?[Note: Exercises 11.20(b) and 11.21 (b) take you to relativisticmechanics which is beyond the scope of this book. They have beeninserted here simply to emphasise the point that the formulas youuse in part (a) of the exercises are not valid at very high speeds orenergies. See answers at the end to know what ‘very high speed orenergy’ means.]
Answer» (a) A monoenergetic electron beam with electron speed of 5.20 × 106m/s is subject to a magnetic field of 1.30 × 10–4 Tnormal to the beam velocity. What is the radius of the circle tracedby the beam, given e/m for electron equals 1.76 × 1011C /kg (b) Is the formula you employ in (a) valid for calculating radius ofthe path of a 20 MeV electron beam? If not, in what way is itmodified?[Note: Exercises 11.20(b) and 11.21 (b) take you to relativisticmechanics which is beyond the scope of this book. They have beeninserted here simply to emphasise the point that the formulas youuse in part (a) of the exercises are not valid at very high speeds orenergies. See answers at the end to know what ‘very high speed orenergy’ means.]

Discussion

Explore topic-wise InterviewSolutions in .

The current i (in Ampere) in the 2 Ω resistor of the given network is.0

5. A concave mirror of focal length 20 cm produces an image twice the height of the object. If theimage is real, then the distance of the object from the mirror is(1) 20 cm (2) 60 cm(3) 10 cm (4) 30 cm

four different sets of quantum number for 4 electron are given below : e1= 4,0,0,-1/2 e2 = 3, 1, 1,-1/2 e3 = 3,2,2, +1/2 e4 = 3,0,0, +1/2 THE ORDER OF ENERGY OF E1, E2 , E3 AND E4 IS : a. e1>e2> e3> e4 b. e4 >e3 >e2> e1 c. e3 >e1> e2 >e4 d. e2 >e3 >e4 e1

a parallel plate capacitor with plate area A and separation between the plates d,is charged by a current I.displacement current through a plane surface of area A/3 parallel to plates and drawn symmetrically betwee the plates? i

3.the potential energy of a particle of.mass 100 g is moving along x axis byU=5x(x-4),where x is in meters .the period of assilation is

Oscillations 113 (Simple Harmonic Motion) 9. A particle executes SHM according to equation e x = 10 (cm) cos[2nt ], where t is in second. The magnitude of the velocity of the particle at ts will be (1) 24.7 cm/s 6 (2) 20.5 cm/s (4) 31.4 cm/s (3) 28.3 cm/s Simnle Harmonic Motion and Uniform Circular

1.) In scattering experiment, find the distance of closest approach, if a 6 MeV o-particle is used(1) 3.210-16m(3) 4.6 x 10-15 m(2) 2 x 10-14 m(4) 3.210-15 m

A cylindrical vessel of 90cm height is kept filled upto the brim. It has four holes 1,2,3 and 4 which are respectively at heights of 20cm, 30cm, 40cm and 50cm from the horizontal floor PQ. The water falling at the maximum horizontal distance from the vessel comes from the holes marked as number

An aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. Compare its centripetal acceleration with the acceleration due to gravity.

A body of mass 2kg is placed on a smooth horizontal surface .Two forces F1= 20N & F2=10√3N are acting on the body in direction making angle of 30 & 60 to the surface .The reaction of the surface on the body will be a)20Nb)25Nc)5Nd)zero

On a 200 km track a train travels the first 50 km at a uniform speed of 40kmper hour how fast the train must travel the next 150km so as to maintain the average speed of 60km per hour

The velocity vector at a point A varies with time as where a and b are positive cons†an ts. The equation of trajectory of the point would be

The energy stored in the magnetic field if current of 5 A produces a magnetic flux of 2×10−3 Wb through a coil of 500 turns is​​​​​​​[1 Mark]

46.A particle is undergoing SHM has the equation x= A sin (wt + Q(fi) ) where x represents the displacement of the particle. The kinetic energy oscillates with time period

Water from a tap emerges vertically downwards with an initial speed of 1 m/s. The cross-section area of the tap is 10−4 m2 . Assuming that the pressure is constant throughout the stream of water and the flow is steady, what will be the cross-section area of the stream 0.15 m below the tap?

Assuming that the capacitors are uncharged initially, find the charge on each capacitor in steady state.

how m uch positive and negative charge is there in a cup of water hoew \xrightarrow{\xrightarrow[{}]{}}

∫(sin x+x2) dx is equal to:

∫1√sec2x+tan2xdx=log|sinx+√f(x)|+C, then which of the following is/are correct?

Moment of inertia I of a solid sphere about an axis parallel to a diameter and at a distance x from its centre of mass varies as

A tie bar 50mm×8mm is to carry a load of 80 kN. A specimen of the same quality steel of cross -sectional area 250 mm2 was tested in the laboratory. The maximum load carried by the specimen was 125 kN. The factor of safety in the design is.2.5

The average time taken by a molecule of oxygen at 300 K to travel a distance equal to the diameter of the earth. (Diameter of earth =12800 km)

why any capictor is fully charged at t

The energy required to blow a bubble of radius 4cm & 3cm in the same liquid in the ratio of:(a). 3:4(b). 16:9(c). 64:27(d). 27:64

If a body is dropped with an initiaL veLocity 5 m/s under gravit .What height is covered by it

a body revolves with a constant speed v in a circular path of radius r the magnitude of its average acceleration during motion between two points in diametrically opposite direction is

the total no of neutrons present in 54 ml of h2o are? 3na 30na 24na none of thes

a body of mass 5kg is acted upon by a force F=(-3i+4j)N.if its initial velocity at t=0 is v=(6i-12j)m/sec.the time at which it has its velocity along y axis is

The earth is acted upon by gravitation of sun, even though it does not fall into the sun, why?

As shown in the figure, if the value of rms current is 2.2 A, the power factor of the box is

consider a solid sphere of radius r and mass m which has a charge q distributed uniformly over its volume . The sphere is rotated about a diameter with an angular speed ω. Show that the magnetic moment μ and the angular momentum ι of the sphere are related as μ=qι/2m

A uniform chain of mass m hangs from a light pulley, with unewual lengths of the chain hanging from the two sides of pulley the force exerted by moving chain on the pulley is

In a double-slit experiment, green light (λ=5303 ˚A) falls on a double slit, having a separation of 19.44 μm and a width of 4.05 μm. The number of bright fringes between the first and the second diffraction minima is :

A uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity omega about a vertical axis passing through one end. The tension in the rod at a distance x from the axis is

The components of a vector along the x and y directions are (n+1) and 1 respectively. If the co-ordinate system is rotated by an angle 60⁰, then the components changes to n and 3. The value of n will be,

The linear charge density of a thin rod of length L is given by λ=(λ0x) Coulomb/m,[0≤x&lt;L2] and λ=(λ0x2) Coulomb/m,[L2≤x≤L]. Find the total charge on rod. (x is measure from one end of the rod).

when dipole is placed in a uniform electric field net force on it is 0 but torque is not 0. but according to formula τ=rFsinθ, as F is 0 so τ should be 0?

A swimmer wishes to cross a 500m wide river flowing at a rate of 2 m/s. His speed with respect to still water is 4 m/s. What angle (in degrees) should the swimmer make with the vertical so that he reaches the exact opposite of the point of his start?

Describe the Parallax method to find out how far a star is?

An alternating voltage, of peak value 283 V and of varying frequency, is applied across a series LCR combination in which, R=3 Ω,L=25 mH and C=400 μF. The frequency of the source for which the current and voltage are in phase, is -

Figure 5.17 shows the position-time graph of a body of mass 0.04 kg. Suggest a suitable physical context for this motion. What is the time between two consecutive impulses received by the body ? What is the magnitude of each impulse ?

The energy stored in the magnetic field if current of 5 A produces a magnetic flux of 2×10−3 Wb through a coil of 500 turns is[1 Mark]

The linear charge density of a thin rod of length L is given by λ=(λ0x) Coulomb/m,[0≤x<L2] and λ=(λ0x2) Coulomb/m,[L2≤x≤L]. Find the total charge on rod. (x is measure from one end of the rod).