Explanation

• If the zero line of the Vernier scale coincides with the zero of the main scale, it means that there is no zero error.
• Zero error occurs when the zero of the Vernier scale is not aligned with the zero of the main scale, resulting in a systematic error in the measurements.

Explanation

To find the area of the chip wrapper, you multiply the length by the width:

Area = Length x Width

= 4.5 cm x 5.9 cm

= 26.55 cm^2

So, the area of the chip wrapper is 26.55 cm^2.

Explanation

Escape velocity depends on the mass and radius of a planet.  

   - Mercury has the lowest mass and smallest radius, hence the least escape velocity.  

Explanation

 - In a pure capacitive circuit, the current leads the voltage by 90°.

- In a pure inductive circuit, the current lags behind the voltage by 90°.

- In both cases, there is a 90° phase difference between current and voltage

Explanation

The SI unit of conductance is the Siemens (S).

It is the reciprocal of resistance, which is measured in ohms (Ω).

Therefore, 1 Siemens is equal to 1/ohm.

The term "mho" is also sometimes used as a unit of conductance, but Siemens is the standard SI unit. 

Explanation

Sound waves are mechanical vibrations that can disturb air particles around a candle flame.

This disturbance causes the flame to flicker due to pressure variations in the air.

Explanation

Friction always acts opposite to the direction of motion, resisting movement.

Since work = force × displacement × cos θ, and θ = 180°, cos 180° = –1, so work is negative.

Explanation

Explanation

Ingenuity is a robotic helicopter that operates on Mars as part of NASA's Perseverance rover mission.

It is a small, autonomous helicopter that uses rotors to lift off the Martian surface and explore the planet from the air.

Ingenuity made history by becoming the first aircraft to fly on another planet in April 2021.

Explanation

Dentists use concave mirrors to illuminate inaccessible places in the tooth.

The concave shape of the mirror allows it to reflect light and images from small, hard-to-reach areas.

Such as the back of the mouth or between teeth.