Explanation

• Communication between a keyboard and computer is simplex.
• It means data flows in one direction only — from keyboard to computer.
• The computer does not send data back to the keyboard during typing.

Additional information:

There are 3 main data transmission modes:

1. Simplex: Data flows in one direction only (e.g., keyboard to computer).
2. Half-Duplex: Data can flow both ways, but not at the same time (e.g., walkie-talkies).
3. Full-Duplex: Data flows both ways simultaneously (e.g., telephone conversations).

Last verified on 17-06-2026

Explanation

• The dimension of viscosity is [ML⁻¹T⁻¹].
• Viscosity measures a fluid’s resistance to flow.
• Higher viscosity means thicker fluid (like honey).
• Lower viscosity means thinner fluid (like water).

Last verified on 17-06-2026

Explanation

• The unit of pressure is N/m² (Newton per square meter).
• It is also called Pascal (Pa).
• Pressure means force applied per unit area.
• Higher force or smaller area increases pressure.

Last verified on 17-06-2026

Explanation

• Honey has the maximum viscosity.
• Viscosity means resistance to flow.
• Honey flows very slowly due to high internal friction.

Last verified on 17-06-2026

Explanation

Kinetic energy formula = 1/2 × mass × velocity²  

Mass is constant.

If KE doubles, then velocity² must double.  

If velocity² becomes 2 times, velocity becomes √2 times.

So kinetic energy doubles by doubling √2 × velocity.

Last verified on 17-06-2026

Explanation

• Lenz’s law is based on the law of conservation of energy.
• It states that induced current always opposes the change causing it.
• This opposition prevents creation of energy from nothing.
• It ensures energy is neither created nor destroyed.

Last verified on 17-06-2026

Explanation

• At the center of the Earth, g = 0.
• Gravity from all directions cancels out at the center.
• So net gravitational force becomes zero.
• An object would feel weightless there.
• This is due to symmetrical distribution of Earth's mass.
• Earth’s surface gravity: 9.8 m/s²

Last verified on 17-06-2026

Explanation

• The dimension of velocity is [L T⁻¹].
• Velocity is defined as displacement per unit time.
• It shows how fast and in which direction an object moves.
• It is a vector quantity.
• SI unit of velocity is m/s.

Last verified on 17-06-2026

Explanation

1 year = 365 days (non-leap)

Seconds in 1 year = 365 × 24 × 60 × 60 = 31,536,000

For 2 years = 31,536,000 × 2 = 63,072,000

Last verified on 17-06-2026

Explanation

Let old average after 9 innings = A  

Total runs after 9 innings = 9 × A

After 10th inning he scores 100  

New average = A + 8  

New total runs = 10 × (A + 8)

So: 9A + 100 = 10(A + 8)  

9A + 100 = 10A + 80  

100 - 80 = 10A - 9A  

20 = A

Old average = 20  

New average = 20 + 8 = 28

Last verified on 17-06-2026