Q1 · medium · AI-verified
What happens to the resistance of a conductor when its temperature increases?
- Resistance becomes zero
- Resistance decreases
- Resistance increases
- Resistance remains the same
Q2 · easy · AI-verified
The loudness of sound depends upon which of the following properties?
- Wavelength
- Speed
- Amplitude
- Frequency
Q3 · medium · AI-verified
Which gas is produced when dilute hydrochloric acid (HCl) reacts with zinc (Zn)?
- Carbon dioxide gas (CO₂)
- Chlorine gas (Cl₂)
- Hydrogen gas (H₂)
- Oxygen gas (O₂)
Q4 · hard · AI-verified
The process by which plants make their own food using sunlight, water and carbon dioxide is called:
- Photosynthesis
- Fermentation
- Respiration
- Transpiration
Q5 · medium · AI-verified
Which mirror is used by dentists to see an enlarged image of teeth?
- Convex mirror
- Bifocal mirror
- Concave mirror
- Plane mirror