User Forum

Read the given statements and select the correct option.
Statement 1 : The forces of action and reaction always appear due to actual physical contact of two bodies.
Statement 2 : A particle can move only under the action of a force.

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 but statement 2 is false.
D Both statements 1 and 2 are false.

The relative sizes of Sun, Earth, Solar system, and the Milky Way are correctly represented by graph

A
B
C
D

Find the missing number, if a certain rule is followed in all the three figures.



A600
B640
C680
D630

Take a clean glass slide and put few drops of water on it. Now place a complete Rheo leaf on water droplets and examine the cells of leaf under the high power of compound microscope. Put a few drops of concentrated salt/sugar solution on the mounted Rheo leaf on the glass slide. Wait for few minutes and again observe the leaf under the high power of microscope.
What will be your observation after few minutes?

A Cell contents are separated from the cell wall.
B Cytoplasm along with plasma membrane has come to lie on one side of cell wall.
C A clear space is seen between the cell wall and protoplast of the cell.
D All of these

Which of the following statements is incorrect regarding endoplasmic reticulum?

A SER helps in detoxification in the liver of vertebrates.
B RER helps in the synthesis of proteins.
C ER helps in the transport of materials from one part of the cell to another.
D None of these

X is present in all eukaryotic cells except mammalian RBC, sieve tube cells of phloem and tracheids and vessels of xylem. X is ________.

A Nucleus
B Endoplasmic reticulum
C Mitochondrion
D Chloroplast

Select the INCORRECT statement from the following.

A There are more than 200 bones in our body.
B Muscles help us in movement.
C There are more than 600 muscles in our body.
D The place where two or more muscles join together is called joint.

Select the incorrect statement(s).
I. Rapid formation and breaking of bubbles in the bulk of a liquid being heated is called evaporation.
II. The spreading out and mixing of a substance with another substance due to motion of its particles is called diffusion.
III. Petrol evaporates faster than water because interparticle forces are stronger in water.
IV. Ice-cream feels colder than ice cold water because of latent heat of fusion.

A I and IV only
B I only
C II, III and IV only
D III and IV only

A cylinder is placed on a balance as shown in the figure. Water is poured into the cylinder and the reading of the balance is recorded for different heights of water in the cylinder.

Which graph correctly shows the variation of the balance reading (say m) with the height (say h)?


A
B
C
D

Choose among the following a country where silk industry began and a country which leads the world in silk production?

(A) China and India

(B) India and China

(C) India and India