educational

A student uses a vernier caliper to measure the diameter of a wooden cylinder. the diagram shows an enlargement of the caliper scales. what is the reading on the scale?

• 2.40 cm

• 1.64 cm

• 0.62 cm

• 0.42 cm

which quantity is calculated by multiplying the magnitude of a force by the distance moved?

• acceleration

• power

• pressure

• work

the graph shows the speed of two cars over a period of time. from the information in the graph, which statement is true.

• car A accelerates at the same rate as car B

• car A and car B always travel at constant speed

• car A is more powerful than car B

• car A starts at a faster speed than car B

Tags

NGSS.MS-PS3-1

the diagram shows a patient having her eyes tested. a chart with letters on it is placed behind her and she sees it reflected in a plain mirror. how far away fro the patient does the chart seem to be?

• 2 m

• 4 m

• 5 m

• 7 m

Tags

NGSS.MS-PS4-2

the diagram represents a block of wood at rest on a horizontal plane.

in which direction does the block's weigh act?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-4

the diagram shows the sane spring with different weights attached. when the weights are removed, the spring returns to its original length.

what is the original length of the spring

• 25 cm

• 20 cm

• 15 cm

• 10 cm

the diagram shows a vacuum flask and enlarged view of a section through the flask wall.

the main reason for the silvering is to reduce heat transfer by?

• conduction only

• radiation only

• conduction and convection

• convection and radiation

Tags

NGSS.MS-PS3-3

a student places a metal block on a balance and takes a reading. he then lowers the same block into a measuring cylinder of water and records the volume of the water displaced.

which of the following could NOT be obtained from these reading?

• the density of a metal

• the mass of the metal

• the surface area of the metal

• the volume. of the metal

transformers are used in power distribution networks as shown.

what does the step-up transformer do?

• it makes the input voltage higher than the output voltage

• it makes the output current higher than the input current

• it makes the output voltage higher than the input voltage

• it makes the output voltage the same as the input voltage

a radioactive source has half-life of 5 minutes.

a detector connected to a ratemeter records a rate of 80 counts per second.

which rate does it record after 10 minutes?

• 0 counts per second

• 20 counts per second

• 40 counts per second

• 160 counts per second