ECAT Physics MCQs

Strain is extension divided by original length.
0.004/2 = 0.002.

At fixed pressure, heating an ideal gas increases its volume.
Temperature must be measured on an absolute scale.

Stress is force divided by cross-sectional area.
1000/0.005 = 200,000 Pa.

Young's modulus is stress divided by strain.
2×10^8 / 0.001 = 2×10^11 Pa.

Gravitational potential is a scalar quantity.
It represents work per unit mass associated with position.

Gravitational force varies inversely with distance squared.
Doubling distance multiplies force by 1/2² = 1/4.

Orbital objects still experience gravity.
They appear weightless because all parts accelerate together.

Field strength is force per unit mass.
G=20/4 = 5 N/kg.

Escape velocity depends on the body's mass and radius.
It is independent of the escaping object's mass.

Weight is W=mg.
W=8×9.8 = 78.4 N.

Density measures how much mass is contained in a given volume.
Its SI unit is kg/m³.

Density is mass divided by volume.
ρ=600/0.5 = 1200 kg/m³.