CATHODE RAYS CAUSES AN OBJECT PLACED BEHIND A PERFORATED ANODE TO CAST A SHADOW ON THE SCREEN. THIS OBSERVATION SHOWS THAT THE RAYS
A. are positively charged B. are negatively charged C. have mass D. travel in straight lines ✓ The answer to the question is: D. travel in straight lines The observation that cathode rays cause an object placed behind a perforated anode to cast a…
WHEN A SPIROGYRA FILAMENT IS PLACED IN A CONCENTRATED SALT SOLUTION FOR 30 MINUTES, THE CELL WOULD BECOME
A. plasmolysed ✓ B. turgid C. shortened D. elongated The answer to the question is: A. plasmolysed When a Spirogyra filament is placed in a concentrated salt solution for 30 minutes, the cell would become plasmolysed. Plasmolysis is the process in which a plant…
WHEN A CELL IS PLACED IN SOLUTION AND THE SIZE OF THE CELL INCREASES, THE CONCENTRATION OF SOLUTION IS SAID TO BE
A. isotonic B. dilute C. hypotonic ✓ D. hypertonic The answer to the question is: C. hypotonic When a cell is placed in a solution and its size increases, the concentration of the solution is said to be hypotonic. In a hypotonic solution, the…
A TRANSPARENT RECTANGULAR BLOCK 5.0CM THICK IS PLACED ON A BLACK DOT. THE DOT WHEN VIEWED FROM ABOVE IS SEEM 3.0CM FROM THE TOP OF THE BLOCK, CALCULATE THE REFRACTIVE INDEX OF THE MATERIAL OF THE BLOCK
A. 2/5 B. 3/5 C. 3/2 D. 5/3 ✓ E. 5/2 The answer to the question is: D. 5/3 To calculate the refractive index of the material of the block, we can use the concept of apparent depth. When a transparent block is…