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122.Which of the following parameter in the series LCR circuit is analogous to driving force in mechanics? 1) V/L 2) voltage V

A particle moves from the point (2.0^i+4.0^j) m, at t=0, with an initial velocity (5.0^i+4.0^j) m/s. It is acted upon by a constant force which produces a constant acceleration (4.0^i+4.0^j) m−s−2. The distance of the particle from the origin at time 2 s is found to be n√2, then n is

A concave mirror of focal length 100 cm is used to obtain the image of the sun which subtends an angle of 300 The diameter of the image of the sun will be

42. here is the expression for Lorentz force acting on the charge carriers of a conductor to obtain the expression for the induced emf across the conductor of length L moving with velocity v through a magnetic field B acting perpendicular to its length

A parallel plate capacitor is charged to potential V. A dielectric slab of thickness 3 mm is inserted between the plates and it becomes necessary to increase the distance between them by 2.4 mm to maintain the same potential difference. The dielectric constant of the slab is- (1)3 (2)4 (4)6 (3)5

Same current I is flowing in three infinitely long wire along positive x,y and z directions. The magnetic field at a point (0,0,-a) would be :-(1)(μ0I/2πa)(j-i)(2)(μ0I/2πa)(i+j)(3)(μ0I/2πa)(i-j)(4)(μ0I/2πa)(i+j+k)

A block of mass 4 kg is kept on ground. The co-efficient of friction between the block and the ground is 0.8. An external force of magnitude 30 N is applied parallel to the ground. The resultant force exerted by the ground on the block is (Take g=10 m/s2)

the thermal capacities of two bodies are in the ratio of 1:4. If the rate of loss of heat are equal for the two bodies under identical conditions of surroundings, then the ratio of rate of fall of temperature of the two bodies is- (1) 1:4 (2) 4:1 (3) 1:8 (4) 8:1

A particle executing linear SHM is represented by the equation x=A cos ωt. Which of the following graphs correctly represent the variation of velocity(v) with time(t)?

Rules for rounding of

A lorry with a vertical wind shield moves on a horizontal road in a rainstorm at a speed of 15 m/s. The rain drops fall vertically with a speed of 30 m/s. The angle at which the rain drops strike the wind shield for the driver is :

Consider a steel (Young's modulus E= 200 GPa) column hinged on both sides. Its height is 1.0 m and cross-section is 10mm×20mm. The lowest Euler critical bucking load (in N) is

The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at 0∘C is 3180 m/s. The pressure on the hydrogen gas is (Density of hydrogen gas is 8.99×10−2kg/m3, 1 atmosphere=1.01×105N/m2)

Which of these can be a valid graph?

The system shown here is initially at rest. The spring is now compressed by 1 cm and released. If acceleration of 6 kg block, just after the spring is released, is 13 cm/s2, time period of oscillation (in sec) of the system is xπ. Find x.

A point object O is placed in front of a concave mirror of focal length 20 cm at a distance of 32 cm. A glass slab of refractive index μ = 3/2 and thickness 6 cm is placed at a distance of 10 cm from the mirror. Find the position of final image.

what is fcc unit cell

A juggler tosses a ball up in the air with initial speed u. At the instant it reaches its maximum height H, he tosses up a second ball with the same initial speed. The two balls will collide at a height a)H/4 b) H/2 C) 3H/4 D) ✓3H/4 ​​​

If a planet is suddenly stopped in its orbit, suppossed to be circular then it would fall in the sun in a time___?

79.A hemisphere of radius r and weight W is placed with its curve surface on a smooth table and a string of length L (less than r) is attached to a point on its rim and to a point on the table. Find the tension of the string.

An isosceles prism has one of the refracting surfaces silvered. A ray of light is incident normally on the refracting face AB. After two reflections ray emerges from base BC normally. Then angle of prism is

What will be de-Broglie wavelength of an electron moving with a velocity of 3.31×105 m s−1?(Take h=6.62×10−34 J s)

Sir in earth magnetism I have one doubt please clarify Which earth magnetic pole located at gegrophical north?

The horizontal range is four times the maximum height attained by a projectile.The angle of projection is (a)90^0 (b)60^0 (c)45^0 (d)30^0

Rain is falling vertically with a speed of 12√3 m/s. A woman rides a bicycle with a speed of 12 m/s in East to West direction. What is the velocity of rain relative to the woman? ( Eastward and upward are positive x-axis and y-axis respectively)

Show that any number of the form 8 rise to the power n, n is always a natural number, can never end with digit 0

Integration of e raised to power -2x

A square coil of N turns with length of each side equal to L, carring a current i is placed in a uniform magnetic fileld →B=B0^j as shown in figure. What is the torque acting on coil?

A particle is moving in a circle of radius R = 3 mwith an angular speed 2 radian per second inclockwise direction as given in the diagram. Theacceleration (in m/s2) of particle at point P is

Y=√|x|-1/√|x|-3Find domain

A block of mass 1 kg is placed on a rough wedge which is fixed on an elevator moving upward with constant velocity 2 m/s.The block is at rest with respect to wedge.Net reaction force on the block

A star, emitting a radiation of wavelength 5000 ˚A, is approaching earth with a speed of 3×106 m/s. The wavelength of the radiation received on earth will be,

A block of mass 10 kg is realised on a rough inclined plane .block start descending with acc 2m/s2 kinetic friction acting on a blck ois

Figure shows a schmitt trigger circuit and the corrsponding hysteresis characteristics. The value of VTH−VTL is _______ volts. 12

Which of the following a species has maximum charge to mass ratio ? (1) D^+ (2) H^{+ } (3) He^+ (4) He^{2+}

A pendulum is taken 1km inside the earth from sea level. Then the approximate gain or loss of time of pendulum. Is the time period of a seconds pendulum always the same i.e; 2 seconds or is it dependent on the surrounding of the system?

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volts is

Three rods of the same mass are placed as shown in the figure. The co-ordinates of the centre of mass of the system is

Whish is more elastic,rubber or steel?

A pair of adjacent coils has a mutual inductance of 1.5 H. If thecurrent in one coil changes from 0 to 20 A in 0.5 s, what is thechange of flux linkage with the other coil?

48. 2 infinite wires are kept perpendicular to each other without touching each other explain the nature of the force and also mention the motion of wires

21.What is the functions of voltmeter and ammeter ,when 10 emf cell are connected in series?

A juggler tosses a ball up in the air with initial speed u. At the instant it reaches its maximum height H, he tosses up a second ball with the same initial speed. The two balls will collide at a height a)H/4 b) H/2 C) 3H/4 D) ✓3H/4