
4 identical balls of radius R and mass m are lying in a gravity free space. The balls are in contact and their centres are forming vertices of a square of side 2R in horizontal plane. One identical ball travelling vertically ...

2 mirrors are inclined at an angle θ as shown in figure.Light ray is incident parallel to one mirror.The ray will start retracing its path after the third collision if: a)θ=45° b)θ=30° c)θ=60° d)all three *Image* ...

n identical waves each of intensity I interfere with each other.The ratio of maximum intensities if the interference is (i) coherent and (ii) incoherent is a.n^2 b.1/n c.1/n^2 d.n ...

A parallel plate capacitor of area 60cm^2 and separation 3mm is charged initially at 90 micro coulomb. If the medium between the plates get slightly conducting and the plate loses charge initially at the rate of 2.5 *10^8 C ...

A drinking straw of length 3a/2 and mass 2m is placed on a square table of side 'a' parallel to one of its sides such that one third of its length extends beyond the table.An insect of mass m/2 lands on the inner end ...

An Ice cube of mass 0.1 kg at 0 degree C is placed in an isolated container which is at 227 degree C. the specific heat s o fthe container varies with temperature T according to the empirical relation S=A+BT. where A=100cal/k ...

in adiabatic compression decrease in volume is assosiated with a)inc in temp n decre in pressure b)decr in temp n incre in pressr c)decre in both d0inc in both ...

*Image* A block is dragged on a smooth plane with the help of a rope which moves with velocity v shown in Fig. The horizontal velocity of the block is a)v b) vsinθ c) v/sinθ d) v/cosθ ...

What is the magnitude of magnetic field at centre O of loop of radius √2 m made of uniform wire when a current of 1 A enters in the loop and taken out of it by two long wire as shown ...

An isolated conducting sphere of radius R=6.85cm is given a charge of 1.25nC. What is is the radius R0 of an imaginary spherical surface such that half of the stored potential energy lies within it ? ...

shadow is formed by ______________ objects transparent translucent both of them none of these Your Answer b Correct Answer d How can the answer be none of them ? Transculent objects form a light shadow and transparent objects ...

The horizontal and vertical distances traveled by a particle in time t are given by x = 6t and y=8t5t^2 . If g=10m/sec^2 , then the initial velocity of the particle is a) 8 m/sec b) 10 m/sec c) 5 m/sec d) zero ...

infinite number of straight wires each carrying current i are equally placed as shown in the fig. adjacent wires have curent in opposite direction. net magnetic field at point p is *Image* a. μi ln2/4π 3 a k b. μi ln4/4π ...

Why is it that we never consider internal forces while considering a particular system? Explain in detail. ...

1) Explain why it easier to pull the roller than to push it with the help of a diagram. 2)A horse cannot pull an empty cart in space. Why is it so? Explain in some detail. ...

1) Explain why it easier to pull the roller than to push it with the help of a diagram. 2)A horse cannot pull an empty cart in space. Why is it so? Explain in some detail. ...

I have two questions of friction : 1)Why is the coefficient of friction never equal to 1 or 0,but always between 0 and 1? What will happen if the coefficient of friction is EXACTLY 0 or 1? Please explain in some detail. 2)Pol ...

The device used for measuring potential difference is known as _____________. a) potentiometer b) ammeter c) galvanometer d) voltmeter ...

what is the order of human mass ...

The velocitytime graph of a body is shown in figure. The displacement covered by the body in 8 seconds is *Image* a) 10 m b) 9 m c) 24 m d) 30 m ...

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1.Determine the magnetic field at the centre of the current carrying wire arrangement shown in the figure. the arrangement extends to infinity. the wires joining the successive squares are along the line passing through the c ...

Law of reflection in irregular surface is a) obeyed b) not obeyed c) depends on the material of the surface d) none of these ...

A disk of radius r,mass m which has a charge q distributed uniformly over it is rotating in a magnetic field B about it's axis with an angular speed ω.Find the ratio of magnetic moment and angular momentum. ...

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A coil of area A = 0.5 m2 is situated in a uniform magnetic field B = 4.0 wb/m2 and area vector makes an angle of 60o with respect to the magnetic field as shown in figure. The value of the magnetic flux through the area A wo ...

A car weighing 200 kg accelerates from rest at the rate of 5 m/s2. Find its momentum after 10 s. a) 10000 b) 1000 c) 500 d) none of them ...

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A circular loop of radius R carries a current I.Another circular loop of radius r(<<R) carries a current i and is placed at the centre of the larger loop.The planes of the two circles are at right angle to each other.Fi ...

Describe the energy of a car driving up a hill. a) entirely kinetic b) entirely potential c) both kinetic and potential d) gravitational ...