Explanation

• Newton’s First Law is also called the Law of Inertia.
• A body remains at rest or in uniform motion.
• It continues unless an external unbalanced force acts on it.

Last verified on 12-04-2026

Explanation

20 years = 2 half-lives  

Fraction left = (1/2)² = 1/4  

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Explanation

For parallel: 1/R = 1/4 + 1/6 = 3/12 + 2/12 = 5/12  

R = 12/5 = 2.4 Ω  

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Explanation

To find the decimal equivalent of the binary number 1011:

(1 × 2³) + (0 × 2²) + (1 × 2¹) + (1 × 2⁰)

= (1 × 8) + (0 × 4) + (1 × 2) + (1 × 1)

= 8 + 0 + 2 + 1

= 11

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Explanation

Perpendicular vectors → R = √(3² + 4²) = √(9 + 16) = √25 = 5 N  

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Explanation

• An AND gate gives output 1 only when both inputs are 1.
• If any input is 0, output becomes 0.
• It follows the rule: 1 AND 1 = 1.

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Explanation

• Carbonated water contains carbon dioxide (CO₂) dissolved in water.
• The gas is dissolved under high pressure.
• It forms weak carbonic acid (H₂CO₃).
• This gives fizzy drinks their bubbles.
• So, it is carbon (CO₂) in water under high pressure.

Last verified on 12-04-2026

Explanation

• Kc (equilibrium constant) depends on temperature.
• In endothermic reactions, heat is absorbed.
• Increasing temperature shifts equilibrium forward.
• This increases the value of Kc.
• Therefore, Kc is directly proportional to temperature in endothermic reactions.

Last verified on 12-04-2026

Explanation

• An acidic buffer consists of a weak acid + its salt (conjugate base).
• This combination resists changes in pH.
• HCN (weak acid) + NaCN (its salt) fits this definition.

Last verified on 12-04-2026

Explanation

• In thermodynamics, a system is the part under study.
• Everything outside it is called surroundings.
• Here, the focus is on the gas behavior.
• So, the O₂ gas inside the balloon is the system.
• Freezer and environment act as surroundings.

Last verified on 12-04-2026