Physics Test - ...

For the given uniform square lamina ABCD whose centre is O,

F₁ and F₂ are focal lengths of the objective and the eyepiece of a telescope, respectively. The angular magnification for this telescope is equal to

The half-life of ¹³¹I is 8 days. If we have a sample of ¹³¹I at time t = 0, we can assert that

In the following figure, the height of the object is H₁ = + 2.5 cm. What is the height of the image of H₁?

A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of 75°. One of the fields has a magnitude of√2 x 10^-2 T. The dipole attains stable equilibrium at an angle of 30° with this field. What is the magnitude of the other field?

Two SHMs are respectively represented by y₁ = a sin (ωt - kx), and y₂ = b cos (ωt - kx). The phase difference between the two is:

A magnet of magnetic moment M and length 2l is bent at its mid-point such that the angle of bending is 60^o. Now, the magnetic moment is

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, then

A uniform metre scale of length 1 m is balanced on a fixed semi-circular cylinder of radius 30 cm as shown in the figure. One end of the scale is slightly depressed and released. The time period (in seconds) of the resulting simple harmonic motion is

(Take g = 10 ms^-2)

A magnet of length 10 cm and magnetic moment 1 Am² is placed along the side AB of an equilateral triangle ABC. If the length of side AB is 10 cm, then the magnetic field at point C is