The value of the universal gravitational constant \( G = 6.67 \times 10^{-11} N m^2/kg^2 \) in the CGS system is:

• (A) \( 6.67 \times 10^{11} \)
• (B) \( 6.67 \times 10^{-18} \)
• (C) \( 6.67 \times 10^{-8} \)
• (D) \( 6.67 \times 10^{8} \)

A 2 kW air conditioner works for 8 hours per day. At the rate of Rs 6/kWh, the electricity bill for one day will be:

• (A) Rs 12
• (B) Rs 24
• (C) Rs 48
• (D) Rs 96

Two forces of 4 N and 3 N act on a particle. For maximum resultant force, the angle between them should be:

• (A) \(180^\circ\)
• (B) \(120^\circ\)
• (C) \(90^\circ\)
• (D) \(0^\circ\)

During short circuiting, the electric current in the circuit-

• (A) Becomes very small
• (B) Remains unchanged
• (C) Increases greatly
• (D) Changes continuously

The order (characteristic) of 0.99 is-

• (A) -1
• (B) 0
• (C) 1
• (D) 2

What is the chemical formula of rust?

• (A) Hydrated ferrous oxide
• (B) Only ferric oxide
• (C) Hydrated ferric oxide
• (D) None of these

What does the pH value indicate in water?

• (A) Temperature
• (B) Acidity or alkalinity
• (C) Turbidity
• (D) Conductivity

Which type of radiation consists of high-energy photons with no mass or charge?

• (A) Alpha radiation
• (B) Beta radiation
• (C) Gamma radiation
• (D) Neutron radiation

Which element is always present in organic compounds?

• (A) Hydrogen
• (B) Carbon
• (C) Oxygen
• (D) Nitrogen

The main function of enzymes in organic reactions is to:

• (A) Increase reaction temperature
• (B) Increase reaction rate
• (C) Change reaction mechanism
• (D) Inhibit reaction progress

Ribosomes are the sites for the synthesis of which of the following?

• (A) Lipids
• (B) Proteins
• (C) Carbohydrates
• (D) Nucleic acids

Which of the following nitrogenous bases is NOT found in DNA?

• (A) Adenine
• (B) Cytosine
• (C) Thymine
• (D) Uracil

The Fluid Mosaic Model of the cell membrane was proposed by:

• (A) Schleiden and Schwann
• (B) Singer and Nicolson
• (C) Watson and Crick
• (D) Robert Brown

During which phase of the cell cycle does DNA replication occur?

• (A) G1 phase
• (B) S phase
• (C) G2 phase
• (D) M phase

Which organelle is known as the ’Suicidal Bag’ of the cell?

• (A) Mitochondria
• (B) Lysosome
• (C) Ribosome
• (D) Golgi apparatus