11.

The image produced by a concave lens is always

• real

• virtual

• inverted

• enlarged

The current i flowing through the cell in the given circuit is (internal resistance of cell is zero)

• 1 A

• 3/2 A

• 2 A

• 3 A

If somehow the distance between the Sun and the Earth is doubled, the gravitational force between them will become

• double

• half

• four times

• one-fourth

If the magnitude of vector $\overrightarrow{\mathrm{A}}$ is 10 cm and the direction is North, then what is the magnitude and direction of the vector $-2 \overrightarrow{\mathrm{A}}$?

• 20 cm East

• 20 cm West

• 20 cm North

• 20 cm South

An electric charge q moves with a constant velocity v parallel to the lines of force of a uniform magnetic field B. Force on charge is

• qvB

• qv/8

• Zero

• Bv/q

The pH value of any solution that converts red litmus to blue in color will be

• 1

• 4

• 7

• 10

Which type of hybridization occurs in ClF₃?

• sp³

• sp²

• sp²d

• sp³d

Marsh gas is

• Methane

• Ethane

• Propane

• Butane

Rusting of iron is

• Reduction reaction

• Oxidation reaction

• Redox reaction

• Displacement reaction

Petroleum is refined by

• simple distillation

• fractional distillation

• steam distillation

• vacuum distillation