To prepare a blood smear slide a student placed a drop of blood on a glass slide and added a drop of distilled water to dilute the blood. He then added stain (a coloured chemical used to see the cells) to it before placing the coverslip over it. When viewed, under the microscope he could not see the blood cells. Which of the following best explains this?
AThe blood cells had burst.
BThe blood had dried before the water was added.
CThe drop of water diluted the blood too much and cells dispersed too far away from each other.
DThe water caused the cells to shrink.
One night, Lissy watched a constellation in the sky over a period of several hours. She found that the constellation seemed to move across the sky. Which of these can explain this?
A Some constellations are moving constellations.
B As the Earth rotates, constellations seem to move.
C The outer portions of the galaxy rotates very slowly around the Earth.
D All constellations move randomly through the sky.
What are the characteristics of metals?
A Good conductors of electricity and heat; solid at room temperature; transparent, shine brightly when polished.
B Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; do not shine at all when polished.
C Bad conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films.
D Good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films; shine brightly when polished.
answer is a extremely simpleclearbahut Hassan saval
Refer to the given classification table and select the correct option.
AX could be hinge joint whereas Z could be pivot joint.
BY could be ball and socket joint whereas Z could be gliding joint.
CX could be gliding joint whereas Y could be pivot joint.
DY could be pivot joint whereas Z could be gliding joint.
Refer to the given flow chart and select the correct statement regarding P, Q, R and S.
AP could be silk and Q could be asbestos.
BQ could be cotton and R could be wool.
CR could be flax and S could be fleece.
DP could be asbestos and R could be silk.
Small pieces of rocks are carried away by rivers and streams and are deposited at newer places. Repeated deposition presses down the lower layers and hardens them into rocks. Examples of such kinds of rocks are____________ .
AGranite, pumice, obsidian
BSandstone, limestone, shale
CMarble, slate, quartzite
DSandstone, conglomerate, gneiss