C++ | MCQs

Explanation

 Energy = Power × Time = 40 W × 3600 s = 144000 J

Explanation

pH is directly proportional to the oxygen-carrying capacity

Meaning that as pH increases, the ability of blood to carry oxygen also increases. 

Explanation

It is the total heat content of a system when the pressure is constant.

It helps us understand energy changes in chemical reactions.

Explanation

If the RC value is small in a circuit, the capacitor charges fastly. 

RC time constant: The time constant in an RC circuit is represented by the product of resistance (R) and capacitance (C). 

Charging speed: A smaller RC value means the capacitor charges faster. 

Large RC value: Conversely, a large RC value indicates a slower charging process for the capacitor. 

Explanation

 Le Chatelier's principle states that when a system at equilibrium is subjected to a change (like temperature), the system will shift to counteract the change and re-establish a new equilibrium. 

Explanation

The property that does not depend on the nature of the solute molecule is the Colligative property. 

Colligative properties depend solely on the number of solute particles present in a solution, not their identity or chemical nature. 

Explanation

Explanation

The retention factor (Rf) in chromatography is a unitless value

Because it is calculated as a ratio of two distances (distance traveled by the solute and distance traveled by the solvent), the units of length cancel out. 

Explanation

If A · B = 0, it means the vectors A and B are perpendicular.

The magnitude of the cross product is:

|A × B| = |A||B|sinθ

For perpendicular vectors, θ = 90°, so sin(90°) = 1

⇒ |A × B| = AB × 1 = AB

Explanation

A body moving in a circular path with constant speed has variable acceleration. 

While the speed remains constant, the direction of the velocity vector is constantly changing as the body moves around the circle.

Since acceleration is the rate of change of velocity, and velocity is changing (even though speed is constant),

The body experiences a constant magnitude of acceleration

But the direction of that acceleration changes at every point on the circle.

This makes the acceleration variable.