BCA STEM Concepts 3

Question 1

A circuit has a 12-volt battery and a 4-ohm resistor. What current flows through it?

Accepted Answer

3 A

Answer

Using Ohm's Law, I = V/R = 12/4 = 3 amperes.

Question 2

What is the role of RNA polymerase in molecular biology?

Accepted Answer

Transcribes DNA into mRNA

Answer

RNA polymerase reads the DNA template strand and synthesizes a complementary mRNA strand during transcription.

Question 3

In set theory, what does A ∩ B represent?

Accepted Answer

Elements in both A and B

Answer

The intersection A ∩ B contains only elements that belong to both set A and set B simultaneously.

Question 4

Which layer of the Earth is primarily composed of iron and nickel and generates Earth's magnetic field?

Accepted Answer

Outer core

Answer

The liquid outer core, composed of iron and nickel, generates Earth's magnetic field through convection currents.

Question 5

In programming, what does a 'function' or 'method' primarily allow developers to do?

Accepted Answer

Reuse blocks of code without repetition

Answer

Functions encapsulate reusable logic so it can be called multiple times without duplicating code.

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