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A domain in ferromagnetic iron is in the form of a cube of side length 1

A domain in ferromagnetic iron is in the form of a cube of side length 1μm. Estimate the number of iron atoms in the domain. The molecular mass... View Article

A particle of mass 200 g executes shm. The restoring force is provided by spring of spring constant 80 nm^–1. What is the magnitude of acceleration when mass is 2 cm away from equilibrium position?

A particle of mass 200 g executes shm. The restoring force is provided by spring of spring constant 80 nm^–1. What is the magnitude of... View Article

A man is crossing a river of width 60 m flowing with a velocity of 5 m/s. He reaches a point b from point a as shown in figure in 5 sec. His velocity in still water should be

(a) 13 m/s (b) 12 m/s (c) 5 m/s (d) 10 m/s Answer: The correct answer is (a) 13 m/s velocity in x-direction should counter the flow so as to... View Article

A 20f capacitor is charged to 5V

A 20F capacitor is charged to 5V and isolated. It is then connected in parallel to an uncharged capacitor of 30F. The decrease in the energy of... View Article

The velocity of the centre of a smaller cylinder is v. There is no slipping anywhere. The velocity of the centre of larger cylinder is

The velocity of the centre of a smaller cylinder is v. There is no slipping anywhere. The velocity of the centre of larger cylinder is (a)... View Article

The total energy of the electron in the first excited state of hydrogen is `-3.4 ev.` What is the kinetic energy?

The total energy of the electron in the first excited state of hydrogen is `-3.4 ev.` What is the kinetic energy? (a) + 3.4 eV (b) +4.3 eV (c)... View Article

Select the following best experimental setup for placing the part of the ray of light passing through a

Select the from following best experimental setup for tracing the part of the ray of light passing through a rectangular glass slab. (a) P... View Article

If the rotational speed of earth is increased then weight of a body at the equator

If the rotational speed of earth is increased then weight of a body at the equator (a) increases (b) decreases (c) no changes (d) increases... View Article

A far sighted person can see object beyound 94 cm clearly, if separation between glasses and eye lens is 2 cm, then find

A far sighted person can see object beyound 94 cm clearly, if separation between glasses and eye lens is 2 cm, then find the focal length.... View Article

A block is limiting equilibrium on a rough horizontal surface. If the net contact force is sqrt(3) times the normal force, the frictional force is

A block is limiting equilibrium on a rough horizontal surface. If the net contact force is times the normal force, the co-efficient of the... View Article

The total average energy density of e.m waves whose electric field variation is given by e = (50 n/c) sin (ωt – kx) will be nearly

The total average energy density of e.m waves whose electric field variation is given by e = (50 n/c) sin (ωt - kx) will be nearly (a) 10-8 J/m3... View Article

A ray of light suffers minimum deviation, while passing through a prism. The angle of inclination of the ray, inside the prism with the base of prism is

A light ray suffers minimum deviation, while passing through a prism of refractive index 1.5 and refracting angle 600. Calculate the angle of... View Article

A thin convex lens is made of two materials with refractive indices n1 and n2 .

A thin convex lens is made of two materials with refractive indices n1 and n2 as shown in the figure. The radius of curvature of the left and... View Article

Three coins are tossed at once. What is the probability of getting at least two tails?

When three coins are tossed at once, the sample space is {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}. I.e., n(S) = 8 Let E be the event of... View Article

Three coins are tossed simultaneously. what is the probability of (i) getting at most two heads (ii) getting at most two tails.

When three coins are tossed simultaneously, the sample space becomes 23 = 8 S = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT} Probability of... View Article

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