ppsc physics lecturer mcqs

Which of the following SI units is not named after any physicist?

The inability of rays of different colours to converge a single point after refraction through a convex lens a called:

Two convex lenses of focal length f used in combination become telescopic when the distance between them is:

One yard is equivalent to:

The two electrons in a helium atom:-

There are no expected lines absent from the spectra of:

The defect in image due to oblique centric rays falling on the lens is called:

One mile equals to how many kilometers?

The total energy of an atomic electron is:

The smallest unit of mass; yoctogram (yg) equals:

(a) 10−15 g
(b) 10−18 g

(c) 10−21 g
(d) 10−24 g

What is a “zoom lens”?

The variation of focal length of a lens when we pass from the central portion to periphery is called:

When a beam of light is used to determine the position of an object, the greatest accuracy is obtained if the light:

What determines the polarization of an electromagnetic wave?

The energy of a quantum states is primarily dependent upon the quantum number:

The volt (V) is a SI derived unit of electromotive force, commonly called:

A hydrogen atom is in its ground state when its orbital electron:

The power of lens in dioptress (D) is:

A molecule whose charge distribution is not perfectly symmetrical is called:

Water is an excellent solvent because its molecules are:

Dispersive power of a prism depends upon the wavelength of the light used and is:

Two lenses of focal lengths f1 and f2 are separated by a distance d. What is the condition that the condition be achromatic?
(a) f1 + f2 = 2d
(b) f1 − f2 = 2d
(c) f1f2 = d
(d) f1f2 = 2d

Modern physical theories indicate that:

Relative to the original photon, the photon that emerges from a collision with an electron has:

If D1 and D2 are the power of two lenses placed in contact, then the power of the combination will be:

(a) D1D2

(b) D1/D2
(c) D1 − D2

(d) D1 + D2