Science Daily Test (Sec 2) worksheet - Free Printable

Let's go through each question one by one and solve them with explanations.

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Question 1:

The diagram below shows a battery. The parts X and Y are known as the _________ of the battery respectively.

Diagram:
- X is the top terminal (flat end) of the battery.
- Y is the bottom terminal (rounded end) of the battery.

In a typical battery:
- The top flat end (X) is the positive terminal (+).
- The bottom rounded end (Y) is the negative terminal (-).

So, X = positive pole, Y = negative pole.

✔ Correct answer: b. Positive and negative poles

> Explanation: Batteries have two terminals: positive and negative. These are not magnetic poles (north/south), so options a and c are incorrect. "Up and down end" is just descriptive, not scientific terminology.

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Question 2:

The symbols of the electrical components below represent ________

Symbol shown: A rectangle with two lines extending from each side — this is the standard symbol for a resistor.

✔ Correct answer: d. Resistance

> Explanation: In circuit diagrams:
> - A rectangle represents resistance.
> - Voltage is represented by a battery symbol (long and short lines).
> - Current is not a component; it’s measured in amperes.
> - Potential is another term for voltage.

So, the symbol is for resistance.

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Question 3:

Study the circuit diagram! Which one of the following will make each bulb in the circuit less bright?

Circuit: Two bulbs connected in series with a battery and a switch.

Now let’s analyze each option:

a. Removing one bulb from the circuit
→ If you remove one bulb, the circuit becomes open → no current flows → both bulbs go off. But the remaining bulb (if any) would be brighter? Actually, only one bulb remains, but since it's a series circuit and one bulb is removed, the circuit breaks. So no light at all. But we’re asked about making each bulb less bright, implying both still lit. So this doesn’t apply.

b. Removing the switch from the circuit
→ Switches are used to open/close the circuit. Removing it may break the circuit or leave it open. But if it's just removed, the circuit might be broken → no current → bulbs go off. Again, not relevant to dimming.

c. Adding one bulb in series to the circuit
→ Now three bulbs in series. Total resistance increases → current decreases → each bulb gets less power → dimmer. ✔

d. Adding one battery in series to the circuit
→ Voltage increases → current increases → bulbs get brighter.

✔ Correct answer: c. Adding one bulb in series to the circuit

> Explanation: In a series circuit, adding more resistors (bulbs) increases total resistance, reducing current. Since brightness depends on power (P = I²R), lower current means dimmer bulbs.

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Question 4:

If the voltage stays the same, but the resistance goes up, the current will...

Use Ohm’s Law:
$$
I = \frac{V}{R}
$$

If V is constant and R increases, then I decreases.

✔ Correct answer: b. decrease (slow down)

> Explanation: Current is inversely proportional to resistance when voltage is constant. So higher resistance means less flow of current.

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✔ Final Answers:

1. b. Positive and negative poles
2. d. Resistance
3. c. Adding one bulb in series to the circuit
4. b. decrease (slow down)

Let me know if you'd like these explained further or want a printable version!