Let's analyze the questions from the uploaded image:

Question 6:
The number of right angles turned through by the hour hand of a clock when it goes from 2 to 8 is:

A right angle corresponds to a 90-degree turn.
1 hour on the clock represents $\frac{360^\circ}{12} = 30^\circ$.

• From 2 to 8, the hour hand moves $8 - 2 = 6$ hours.
• Therefore, the total angle turned is $6 \times 30^\circ = 180^\circ$.
• $180^\circ = 2$ right angles.

Answer: (b) 2

Question 7:
An angle whose measure is equal to half of a revolution is:

A full revolution equals $360^\circ$.
Half of a revolution equals $\frac{360^\circ}{2} = 180^\circ$, which corresponds to a straight angle.

Answer: (c) Straight angle

Would you like more details on how the calculations were performed?

Here are 5 related questions for more practice:

1. How many right angles does the hour hand turn when it moves from 3 to 9?
2. What is the total angle turned by the minute hand in one full revolution?
3. Define a right angle in degrees and radians.
4. How many degrees does the hour hand turn in 5 hours?
5. How is a straight angle different from an obtuse angle?

Tip:
Remember that a full circle or revolution always equals $360^\circ$, and right angles are $90^\circ$.