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Questions in physics

📝 Answered - Match the following. | Column A | Column B | |---|---| | 1. Digital thermometer | a. Radiation | | 2. Laboratory thermometer | b. An insulator | | 3. 0°C | c. Range from -10°C to 110°C | | 4. Wool | d. Freezing point of water | | 5. Black base of cooking utensils | e. Thermistor |

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - A motorist driving at 25 meters/second decelerates to 15 meters/second. The combined mass of the vehicle and the driver is [tex]$1.5 \times 10^3$[/tex] kilograms. What is the amount of mechanical work done by the vehicle? A. [tex]$7.5 \times 10^4$[/tex] joules B. [tex]$1.5 \times 10^5$[/tex] joules C. [tex]$3.0 \times 10^5$[/tex] joules D. [tex]$6.2 \times 10^5$[/tex] joules

📝 Answered - When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is the gap called? (a) energy gap (b) electron - hole pair (c) Recombination (d) Hole

📝 Answered - 1. Which magnet shapes do we typically see? (a) Bar shaped (b) U-shaped (c) Ring shaped (d) All of the above 2. What was the kind of Matsya-yantra? (a) Depth measuring device (b) Compass (c) Fishing device (d) Clock

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - 3. S.I.: Quartz clocks are more accurate than pendulum clocks. S-II: Quartz clocks use periodic motion of simple pendulum for the measurement of time. (A) S-I and S-II are correct and S-II is the correct explanation of S-I. (B) S-I and S-II are correct but S-II is not the correct explanation of S-I. (C) S-I is correct but S-II is wrong. (D) S-I is wrong but S-II is correct.

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - According to Ohm's law, which combination of units is the same as the unit for resistance? A. volt \div ampere B. ampere \times volt C. volt + ampere D. ampere \div volt

📝 Answered - Which medium is more dense? Is it water or air? Complete the sentences below. A ray passing from a ______ dense medium into a ______ dense medium, refracts towards the normal.