Physics Revision (HSc 12th)

The rain drops are in spherical shape due to

• viscosity

• thrust on drop

• surface tension

• residual pressure

The surface tension of a liquid is T. The increase in its energy on increasing the area of its surface by amount A is

• TA

• T²A

• T

• T²A²

A square wire frame of size L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, force acting on the entire frame will be

• 2TL

• 4TL

• 8TL

• 10TL

Which net charge could be found on an object?

• 4.8 x 10^-19 C
• 1.8 x 10^-19 C
• 3.0 x 10^-19 C
• 2.8 x 10^-19 C

Tags

NGSS.HS-PS2-4

which is the field for opposite charges

• 
• 
• 
• 

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• The inside horse
• The outside horse
• Neither - they both have the same angular speed

A point on a standing wave that has no displacement from the rest position.

• amplitude

• period

• antinode

• node

For a SHM, what is the shape of the graph of velocity (v) against displacement (x)?

• straight line

• parabola

• circle

• ellipse

Absolute zero is defined as

• O^o Celcius

• O Kelvin

• 273.15^o Celcius

• 273.15 Kelvin

The pressure of an ideal gas in a vessel is p. The gas is heated at constant volume until the r.m.s. speed of the gas molecules is doubled. what is the new pressure of the gas?

• √2p

• 2p

• 3p

• 4p