Predict the duration of the following.
X : Day on Earth when Earth's rotational speed is somehow halved.
Y : Year on Earth when the distance between Earth and Sun is doubled.
Consider that all the other conditions remain the same.
A48 hrs--------365 days
B12 hrs--------730 days
C48 hrs--------730 days
D12 hrs--------365 days
Ans 1: (Master Answer)
Earth takes 24 hours for one complete rotation on its axis. If rotational speed of Earth is halved then it will complete one rotation in just double time i.e., 48 hrs. Earth completes one revolution in its orbit around Sun in about 365 days. If distance between Earth and Sun is doubled, i.e., radius of Earth's orbit is doubled then it will complete one revolution around Sun in just double time, i.e., 730 days.
Refer to the given figure. Identify P, Q, R and S and select the correct option regarding them.
AQ controls hormone production, behaviour and body temperature.
BP regulates heart beat and blood circulation.
CR controls musculo-skeletal movements and maintains balance and posture.
DS relays information between spinal cord and brain.
Select the option that groups rocks of two different kinds as shown in the box.
ASlate :: Sandstone
BGneiss :: Shale
CLimestone :: Granite
DSlate :: Pumice
Rajesh set up an experiment as shown in the figure.
He placed two cockroaches in both the jars X and Y. The cockroaches in jar X were given air and water. The cockroaches in jar Y were given air, water and food. From his experiment Rajesh was trying to find out ___.
AWhether the cockroaches need air to live
BWhether the cockroaches need food to live
CWhether the cockroaches need water to live
DWhether the cockroaches can live together in the dark