MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

A stone of mass m tied to a string of length `l` is rotating along a circular path If the torque on the stone is zero, then ____________.

On the axis and on the equator of an electric dipole for all points ____________.

A capillary tube when immersed vertically in a liquid records a rise of 8 cm. If the tube is immersed inclined 60° with the vertical, then length of liquid column along the tube will be ____________.

A short electric dipole bas a dipole moment of 16 x 10^-9 C m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the dipole axis is: ____________. `(1/(4piepsilon_0) = 9 xx 10^9  "Nm"^2// "C"^2)`

In a capillary rise experiment, the water level rises to a height of 5 cm. If the same capillary tube is placed in water such that only 3 cm of the tube projects outside the water level, then ____________.

Electric field on the axis of a small electric dipole at a distance r is E₁ and at a distance of 2r on its perpendicular bisector, the electric field is E₂. Then the ratio E₂: E₁ is ______.

Electric charges q, q, - 2q are placed at the comers of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is ____________.

Force `vecF` is acting on a particle having position vector `vecr`. Let `vectau` be the torque of this force about the origin. The correct equation is ______.

A thin wire of length 'L' and uniform linear mass density 'm' is bent into a circular loop. The moment of inertia of this loop about the tangential axis and in the plane of the coil is ______.

A disc of mass 10 kg and radius 0.1 m/s rotating at 120 r.p.m. A retarding torque brings it to rest in 10s. If the same torque is due to force applied tangentially on the rim of the disc then magnitude of force is ______.

Water rises to a height 3 cm in a capillary tube. If cross-sectional area of capillary tube is reduced to `(1/9)^"th"` of the initial area then water will rise to a height of ______.

When a capillary tube is immersed in water vertically, water rises to a height 'h' inside the tube. If the radius of another capillary tube is 1/3^rd that of the previous, the height to which water will rise in this tube, is ______.

Water rises to a height of 15 mm in a capillary tube having cross-sectional area 'A'. If cross-sectional area of the tube is made `"'A'"/3` then the water will rise to a height of ______.

A capillary tube when immersed vertically in a liquid records a rise of 6 cm. If the tube is immersed in the liquid at an angle of 60° with the vertical, then length of the liquid column along the tube will be ______.

Water rises to height 2.2 cm in glass capillary tube. The height to which same water rises in another capillary having `(1/4)^"th"` area of cross-section is ______.

When a liquid rises inside a capillary tube, the weight of liquid column inside the capillary tube is supported ______.

Two capillary tubes of same diameter are immersed vertically in two liquids of surface tension 60 dyne cm^-1 and 50 dyne cm^-1 respectively. The rise of liquid in the capillaries is 'h₁' and 'h₂' respectively. If the densities of liquid are 0.8 g/cm³ and 0.6 g/cm³ respectively, then `"h"_1/"h"_2` is ______.

(Neglect the angle of contact)

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 63 × 10^-4 N force due to the weight of the water. The surface tension of water is 7 × 10^-2 N/m. The inner diameter of the capillary tube is nearly ______.

(π = 22/7)

When a capillary is dipped vertically in water, rise of water in capillary is 'h'. The angle of contact is zero. Now the tube is depressed so that its length above the water surface is `"h"/2.` The new apparent angle of contact is ______.

cos 0° = 1

Two capillary tubes A and B of diameter 1 mm and 2 mm respectively are dipped vertically in a liquid. If the capillary rise in A is 6 cm, then the capillary rise in B is ______.