Physics Chemistry & Biology Test 8
What is the outermost layer of Earth called ?
  • Crust
  • Lithosphere
Explanation: The Earth’s outermost layer is the crust. It is a thin, solid layer where we live. Beneath the crust lies the mantle, followed by the core. The crust includes continental crust (land) and oceanic crust (beneath oceans).
Which is the lightest gas ?
  • Helium
  • Oxygen
  • Hydrogen
  • Nitrogen
Explanation: Hydrogen is the lightest and simplest gas in the periodic table. • It has an atomic mass of 1 u. • It is lighter than air and highly flammable. • Hydrogen is widely used in rockets, fuel cells, and industrial processes.
SI unit of Energy is
  • Watt
  • Joule
  • Newton
  • Pascal
Explanation: The SI unit of energy is Joule (J). 1 Joule is the energy transferred when a force of 1 Newton moves an object 1 meter in the direction of the force. Watt is the unit of power, Newton is for force, and Pascal is for pressure.
Which planet is called the "Red Planet" ?
  • Venus
  • Jupiter
  • Saturn
  • Mars
Explanation: Mars is called the Red Planet because its surface is covered with iron oxide (rust), giving it a reddish appearance. It is the fourth planet from the Sun and is known for its thin atmosphere and dust storms.
Device used to measure electric current is -
  • Voltmeter
  • Ammeter
  • Ohmmeter
  • Galvanometer
Explanation: An Ammeter is an instrument used to measure electric current in a circuit. • It is always connected in series with the circuit. • Voltmeter measures voltage, Ohmmeter measures resistance, and Galvanometer detects small currents.
Which vitamin is known as Ascorbic Acid ?
  • Vitamin A
  • Vitamin B
  • Vitamin C
  • Vitamin D
Explanation: Vitamin C, also called Ascorbic Acid, is essential for: i. Boosting immunity ii. Healing wounds Preventing scurvy (a disease caused by vitamin C deficiency) It is found in citrus fruits, guava, and vegetables.
Who is known as the Father of Genetics ?
  • Charles Darwin
  • Gregor Mendel
  • Robert Hooke
    • Explanation: Gregor Mendel, an Austrian monk, is called the Father of Genetics because he discovered the basic laws of inheritance through his experiments on pea plants. He formulated the principles of dominance, segregation, and independent assortment.