Physics and Chemistry MCQs

What is the SI unit of work?

• Joule

• Watt

• Newton

• Volt

Which of the following is a vector quantity?

• Mass

• Speed

• Time

• Velocity

A car accelerates from rest to 30 m/s in 6 seconds. What is its acceleration?

• 5 m/s²

• 10 m/s²

• 15 m/s²

• 20 m/s²

What is the wavelength of light with a frequency of 5.0 × 10^14 Hz? (Speed of light = 3.0 × 10^8 m/s)

• 0.2 nm

• 600 nm

• 6.0 × 10^7 nm

• 1.0 × 10^3 nm

A 1000 N force is applied to move a block 10 meters across a horizontal surface. How much work is done?

• 10 J

• 100 J

• 1000 J

• 10,000 J

Which of the following elements has the highest electronegativity?

• Hydrogen

• Oxygen

• Fluorine

• Carbon

What is the molar mass of water (H2O)?

• 16 g/mol

• 18 g/mol

• 32 g/mol

• 2 g/mol

How many moles of CO2 are produced when 12 grams of methane (CH4) are completely burned in oxygen? (Molar mass of CH4 = 16 g/mol)

• 0.25 moles

• 0.5 moles

• 0.75 moles

• 1 mole

What is the pH of a solution with a hydrogen ion concentration of 1 × 10^-3 M?

• 1

• 3

• 7

• 9

How many valence electrons are there in a carbon atom?

• 2

• 4

• 6

• 8