C9-L10-D4-PRANAYA-PHY-LQ

Multiple Choice

What is the main focus of today’s lesson?

• Types of forces

• Kinetic energy and its formula

• Frictional force only

• Sound energy conversion

Multiple Choice

Kinetic energy is the energy possessed by an object due to its:

• Temperature

• Mass only

• Motion

• Shape

Multiple Choice

If two objects have the same velocity, which has more kinetic energy?

• The heavier object

• The lighter object

• Both have equal energy

• None have energy

Multiple Choice

Why does doubling velocity increase kinetic energy four times?

• Because KE is independent of speed

• Because mass doubles

• Because velocity is squared

• Because 1⁄2 becomes 1

Multiple Choice

KE = 1⁄2mv2. What does ‘m’ represent?

• Momentum

• Mass of object

• Magnetic force

• Motion factor

Multiple Choice

Which equation of motion is used in the derivation?

• v = u + at

• s = ut + 1⁄2at2

• v2 = u2 + 2ad

• F = ma

Multiple Choice

A 2 kg object moves at 3 m/s. KE = ?

• 3 J

• 6 J

• 9 J

• 18 J

Multiple Choice

Velocity doubles from 6 m/s → 12 m/s. KE increases by:

• 2 times

• 3 times

• 4 times

• 8 times

Multiple Choice

Change in KE when v changes 6 → 12 m/s (mass m):

• 36m J

• 54m J

• 18m J

• 72m J

Multiple Choice

Which situation shows large kinetic energy?

• Car at rest

• Slow bicycle

• Fast-moving cricket ball

• Stone lying on ground