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A wire is stretched to make it 0.2% longer. what is the percentage change in resistance?

Find the magnetic field at the centre of the circular loop shown in the figure.

Plants convert light energy to chemical energy through photosynthesis; this is an example of:

75. the radiation of low frequency will be emiited in which trasition of hydrogen atom 1)n=1 to n=4 2)n=2 to n=4 3)n=3 to n=1 4)n=5 to n=2

does weak nuclear forces obey inverse square law

46. Sketch inputs A,B and output Y from a NAND gate from the table attached here

When there is no change of state in a process, which of the following is not required to calculate the heat lost or gained in the process?

A copper block of mass 2.5 kg is heated in a furnance to a temperature of 500∘C and then placed on a large ice block of temperature 0∘C. The maximum amount of ice that can melt is:(Specific heat of copper=0.39 Jg−1∘C−1, latent heat of fusion of ice =334 Jg−1 )

State two characteristics which a source of energy must have.

human eye and colorful world Q.why miopic eye has always "U" at infinity?

For driving current of 2 A for 6 minute in a circuit, 1000 J of work is to be done. The em4)123the source of the circuit is(1) 1.38 V(3) 2.03v(2) 1.68 V(4) 3.10 Vomf Work

In an equilateral prism, if a ray is incident on the normal, the angle of the internally reflected ray deviates through .

Why the value of saturation current is independent of frequency of incident radiations and dependens on intensity?

One coulomb of charge flows through any cross section of a conductor in one second. Select the correct option as per the given statement.

List out the adjectives that have been used to describe the mirror. Add a few more adjectives to the list.

A motor leaves water from a depth of 20 metre comes out from a pipe of cross section area 10cm² with a speed of 5 metre per second if efficiency of motor is 80% then calculate power required by the motor

Calculate wave length of oxygen if its velocity is 1/10 of the speed of light

Two resistors of 5 ohm and 10 ohm are connected in series in a circuit. How does the current passing through them compare

Where should the candle be placed so that the convex lens produces positive magnification?

In which material do you think light rays travel faster - glass or air?

Which elements are used in the manufacturing of solar cells?

Why is the spring constant 'K' called a positive constant although we have to write '-K' in the equation?

At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side? What will be the magnification produced in this case?

For the lens arrangement shown below, the focal length of equivalent system is in the form of (50x13). Find the value of x.[Radii of curvature, focal lengths and refractive indices are labelled in the diagram]

A concave lens has a focal length of 50 cm. What is the power of the lens?

What energy transformation happens in harnessing ocean thermal energy?

Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 JKg−1K−1 . How much heat energy will be required to increase the temperature of the vessel from 250C to 350C?

39. At what temperature molarity and molality of water is equal

List five things you have done over the last one week to −(a) conserve our natural resources(b) increase the pressure on our natural resources

28.The grinding stone of a flour mill is rotating at 60 rad/sec. for this power of 1.2 kwatt is used. The effective torque on stone in N-m (a) 1 (b) 2 (c) 3 (d) 4

A thin prism of a refractive index 3/2 kept in water find ratio of deviation due to prism in water and air

101.Two coaxial coils are very close to each other and their mutual inductance is 5mH. If a current 50sin500t is passed in one of the coils then the peak value of induced e.m.f 8n the secondary coils will be

Pulses of plane waves with wavelength 3.6cm travel from deep water into shallow water, in which their wavelength becomes 1cm. If the velocity of the waves on the surface of deep water is 72cm/s, what is the velocity of the waves on the surface of shallow water?

The correct relation between heat produced (H) and electric current (I) flowing is

9.The m rows each containing n cells in series are joined in parallel. Maximum current is taken from this connection across an external resistance of 3 ohm. If the total no. of cells used = 24 and internal resistance of each cell = 0.5 ohm find the value of m and n.

If a current is passed through a loop of wire, as shown, how will the loop move?

A plano convex lens fits exactly into a plano concave lens.Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive index u1 and u2 and R is the radius of curvature of the curved surface of the lenses ,then the focal length of the combination is

The speed of light in air or vacuum is:

There is only one point on a concave or convex lens, a ray passing through which is not deviated at all. Where does this point lie and what is it called?

A lens of power +3D and another of power -1.5D are placed in contact. What would be the focal length of the combination?

7. The inductance of a solenoid is 5 H and its resistance is 5ohm. if it is connected to a 10 volt battery then time taken by the current to reach 9/10th of its maximum will be options a)4s b)2.3s c)1.4s d)1.2s

Lens I has focal length+25 cm and lens II has focal length +80 cm. Find out which lens has more power?

Please send me some questions on real and apparent depths.

Ring magnets in the image are repelling each other. If top face of blue ring magnet is north pole, identify the pole of following:1. Bottom face of red magnet2. Top face of yellow magnet

20. What is photon & quanta?

What makes the woman start crying?

Can there be any resistor inside some complex circuit where current flowing through it is zero. ..