PAPER ONE 1. Calipers, micrometers and rulers are instruments for measuring length. Which of
these instruments usually have Vernier Scales?
A. Caliper and micrometer B. Caliper and ruler
C. Micrometer and ruler
D. Caliper, micrometer and ruler
2. Which of the following may be used to calculate density?
A. Volume
B. Volume
C. Mass D. Volume x mass
Weight
Mass
Volume
3. Brakes are used to stop a car. What is most of the kinetic energy converted into?
A. Heat energy
B. Light energy
C. Potential energy
D. Sound energy
4.
An experiment rocket has a mass of 3kg. It is fired vertically upwards and reaches
a height of 100m. What is its change in gravitational potential energy?
(g = 10N/kg)
C. 300J
D. 3000)
B. 30J
A. OJ
5. A horizontal force of 8N is applied to a block of mass 2kg resting on a frictionless
table. What is the acceleration of the block?
D. 16m/s2
A. 0.25m/s2
B. 4.0m/s? C. 6.0m/s2
6. A stone of mass 40g is lowered into a measuring cylinder. The water level rises as
shown.​

gas and liquid

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures