Physics

Time period of a simple pendulum is T. The time taken to complete   $\frac{5}{8}$ oscillations starting from mean position is $\frac{\alpha }{\beta }T.$  The value of a is……….

Draw the output signal Y in the given combination of gates.

Given below are two statements:

Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero but the electric field is not zero anywhere in the sphere.

Statement II : If R is the radius of a solid metallic sphere and Q be the total charge on it. The electric field at any point on the spherical surface of radius r (

The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be:

Given below are two statements:

Statement I : A second's pendulum has a time period of 1 second.

Statement II : It takes precisely one second to move between the two extreme positions.

In the light of the above statements, choose the correct answer from the options given below:

A wire of $1\Omega$  has a length of 1m. It is stretched till its length increases by 25%. The percentage change in resistance to the nearest integer is:

The mass per unit length of a uniform wire is 0.135 g/cm. A transverse wave of the form y = -0.21 sin(x + 30t) is produced in it, where x is in meter and t is in second. Then, the expected value of tension in the wire is x * 10^-2 N. Value of x is-----------. (Round-off to the nearest integer)

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A : For a simple microscope, the angular size of the object equals the angular size of the image.

Reason R : Magnification is achieved as the small object can be kept much closer to the eye that 25cm and hence it subtends a large angle.

In the light of the above statements, choose the most appropriate answer from the options given below:

A radiation is emitted by 1000W bulb and it generates an electric field and magnetic field at P, placed at a distance of 2m.Th efficiency of the bulb is 1.25%. The value of peak electric field at P is x * 10^-1 V/m. Value of x is----------. (Rounded – off to the nearest integer)

[Take ${\epsilon }_0=8.85*10^{-12}{C}^2{N}^{-1}{m}^{-2},c=3*10^{8}m{s}^{-1}]$

A person standing on a balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with uniform downward acceleration of 1.8m/s² will be----------N. [g = 10 m/s²]