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An infinite number of point charges, each carrying 1μC charge, are placed along the y−axis at y=1 m,2 m,4 m,8 m....... so on. The total force on a 1 C point charge, placed at the origin, is x×103 N. The value of x, to the nearest integer, is ______. (14πϵ0=9×109 Nm2/C2)

when a cons†an t power is delivered to an object then the graph between velocity and position of the object is (motion of object is along x axis

Define speed. Explain different types of speed with examples.

98.The position vector of a particle changes from 10m east to 10m north in one second.What is the average velocity of the particle?

120.The energy received by earth from sun

What do you understand by thermal expansion of a substance ?

Given are the velocity-time graphs of four particles. In which of the cases the displacement of the particle is zero at time t?

What is Capillarity Derive an expression for the rise of liquid in a capillary tube. (3M)

What is constant speed instantaneous speed and constant acceleration instantaneous acceleration and constant velocity instantaneous velocity and also give example ? ​​​​

Explain why, buildings and dams have wide foundations.

24. A body of 1000kg moving with 0.3m/s in x direction . A hole is present at bottom of body such that mass is droping at the rate of 20gm/s in -y direction .find out force exerted by ejecting mass on body

Name the physical quantity whose SI unit is: (a) m/s (b) m/s2

A stone is dropped on the moon from a height of 30 m. The acceleration due to gravity on the moon is g6. Determine the approximate time taken by the stone to fall on the surface of the moon.(Take g=10 m/s2 )

Q) A street car moves rectilinearly from station A to the next stop B with an acceleration varying according to the law f= a-2bx, where a and b are positive constants and x is its distance from station A. The distance AB is then equal to:- a) 2a/b b)a/b c) a/2b d) none

The maximum number of electrons present in an orbit I = 3, is

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

Current Io​ flows through the solenoid of length L having N number of turns when its connected to DC. A charged particle is projected perpendicular to magnetic field of the solenoid with a speed v0​, then the force on the charged particle in the solenoid

Which of the following gases are present in biogas?

The poem has many examples of alliteration. List five examples.

A car stops to slide in 10 m. During this processthe force on the car due to road is 200 NOpposite to the motion the work done by the roaon the car will be(1) 2000 J(2) -1000 J(4) +2000 J(3)1000 J

A chef while cooking cuts his hand with a sharp-edged knife. To his surprise, his hand did not get a cut with a spoon even on the application of a greater force. What is the reason for this difference?

nta large number of balls are thrown vertically upward in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height . if the maximum height is 5m, the number of balls thrown per minute is (g=10m/s2)n

a parallel plate capacitor has a uniform electric field E in the space between the plates.If the dis†an ce between the plates is d and area of each plate is A , what the energy stored in the capacitor is?

if density of earth is ρ, radius is Re then its gravitational field at distnce Re/4 from centre will be

All the particles are situated at a dis†an ce R from the origin.The dis†an ce of centre of mass of the body from the origin will be_____ More than R Less than R Equal to R At thr origin

50 kJ of energy is consumed in 2.5 s. Calculate power.

Acceleration time graph

is it true that if VELOCITY is zero than SPEED will ALWAYS zero.if yes than does VELOCITY not depend on DISPLACEMENT

A student traces the path of a ray of light passing through a rectangular glass slab.For measuring the angle of incidence, he must position the protractor in the manner shown in figure:(1) A(2) B(3) C(4) D

What is the working process of a venturimeter ?

The hanging bob of a simple pendulum is displaced to one extreme position B and then released. it swings towards centre position A and then to the other extreme position C. In which position does the bob have:(i) maximum potential energy?(ii) maximum kinetic energy?​Give reasons for your answer.

Calculate the electric current flowing through the 20.5 Ω resistor in the following circuit.

if de broglie λ of a particle of mass 1g is 6.626 ×10^{-9}m then its kinetic energy is

Masses of 1 kg each are placed at 1 m, 2 m, 4 m, 8 m,... from a point P. The gravitational field intensity at P due to these masses is

Give three examples for each of the following:1) Good reflectors of sound2) Bad reflectors of sound

A solid iron ball of mass 500 g is dropped in mercury contained in a beaker. (a) Will the ball float or sink? Give reason. (b) What will be the apparent weight of ball? Give reason.

Can we relate inertia and Friction? Can we say that inertia and friction are same at some extent?

15. Assertion : Boiling point order : He

The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.

A ball, when kept on a spring attains a certain height after it is compressed and released. For which of the following height attained by the ball, maximum of his energy is required to compress the spring?

Derive lens formula?

Name the device which is used to produce sound in laboratory experiments.

A skydiver who weighs 60 kg is falling down at a certain speed. He covers 40 m in 2 seconds. The rate of doing work by the skydiver is [Take g=10 m/s2]

A bullet in motion hits and gets embedded in a solid resting on a frictionless table. What is conserved ?

a burning candle isfloating in water with 2/3rd of its length inside water. if candle is burning at the rate of 3cm/h then rate by which level of flame of candle change ?

In the following figure, a body starts from G, and reaches D via A, B and C.Calculate the ratio of the total distance travelled to the total displacement of the body if the curves GA and BC have the same radius, and all the lengths given are in feet.

The height of liquid in cylindrical vessel of diameter d so that the total force on the vertical surface of te vessel be equal to the force on the bottom , will be

Conducting wire of uniform cross sectional area 2 cm2 and length 1 cm carries a current of 8 A and has a potential difference of 2 V. The resistivity of the material of the wire is:

Focal length of the plano–convex lens is 15 cm. A small object is placed at A as shown in the figure. The plane surface is silvered. The final image will form at-

What is constant speed instantaneous speed and constant acceleration instantaneous acceleration and constant velocity instantaneous velocity and also give example ?

Current Io flows through the solenoid of length L having N number of turns when its connected to DC. A charged particle is projected perpendicular to magnetic field of the solenoid with a speed v0, then the force on the charged particle in the solenoid

The hanging bob of a simple pendulum is displaced to one extreme position B and then released. it swings towards centre position A and then to the other extreme position C. In which position does the bob have:(i) maximum potential energy?(ii) maximum kinetic energy?Give reasons for your answer.