Read the given statements and select the correct option.
Statement 1 : Roughage do not give us any nutrients but it prevents constipation.
Statement 2 : Roughage adds bulk to the faeces and keeps it soft, to ensure the smooth movement of waste down the intestine and colon.
ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.
Nitika, a class 8 student performed a few experiments
to study the reactivity of metals. She summarised her
observations in the given table.
Identify W, X, Y and Z.
answer has to be Aonly sodium and potassium react with cold water
Ashish was performing an experiment by setting up an arrangement as shown in the figure.
Which of the following relations holds correct regarding the amount of water that got collected in beakers 1, 2 and 3 after an hour?
A Beaker 1 > Beaker 2 > Beaker 3
B Beaker 1 > Beaker 3 > Beaker 2
C Beaker 3 > Beaker 1 > Beaker 2
D Beaker 3 > Beaker 2 > Beaker 1
The correct answer should be A because water is least absorbed by sandy soil and is absorbed the most by clayey soil.
Earthquakes generate sound waves inside the earth.
Unlike a gas, the earth can experience both transverse
S and longitudinal P sound waves. Typically the
speed of S wave is about 4.0 km s-1, and that of P
wave is 8.0 km s-1. A seismograph records P and
S waves from an earthquake. The first P wave arrives
4 minutes before the first S wave. Assuming the
waves travel in straight line, at what distance does
the earthquake occur?
A 960 km
B 640 km
C 1920 km
D 2880 km
Read the given statements and mark the correct option.
Statement 1 : Bohr's orbits are called stationary orbits.
Statement 2 : Electrons remain stationary in these orbits for some time.
A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.