Question

D. Tick the most appropriate answers:-
1. Machines require proper maintenance for
(a) their efficient use
(b) preserving them
(c) making them look good
(d) both (a) and (b)
2. A stair case is an example of
(a) Lever
(b) Wedge
(c) Inclined plane
(d) Wheel and Axle
3. A spade is an example of
(a) Wedge
(b) Lever if 1st order.
(c) Lever of 2nd order.
(d) Lever of 3'd order.
4. In the level of third order
(a) Fulcrum is in the middle of load and effort.
(b) Load is in the middle of fulcrum and effort.
(c) Effort is in the middle of load and fulcrum.
(d) None of these.
Ipane21​

Answer 1

Answer:

1. there efficient use

2. wedge

3. wedge

4. none of this