Which of the following factors is/are responsible for the cause of seasons ?
(i) The tilted axis of the Earth.
(ii) The revolution of the Earth.
(iii) The rotation of the Earth.
(A) (i) & (ii)
(B) (i) & (iii)
(C) (i) only
(D) (ii) only.
please explain me .
Which of the following behaviours is an example of
a plant responding to its internal clock?
A Bending its leaves toward the sun.
B Growing deep roots during a drought.
C Closing its leaves at the start of night.
D Growing upward over other plants.
My answer is C
Grass is to be laid in a rectangular plot 15 m long and 13 m wide leaving two triangular sections at opposite edges for two flower beds. If the flower beds are to be equal right-angle isosceles triangles with equal sides measuring 1.5 m each, find out how much would it cost to lay grass at Rs 8 per sq. m ?
(A) Rs 1542
(B) Rs 1462
(C) Rs 1264
(D) Rs 1642
Which one of the following statements is false?
(A) The electric current leaving the positive terminal of a battery is the same as the current returning to the negative terminal.
(B) A battery supplies the same current to any object to which it is connected.
(C) A conductor in which an electric current is flowing has an electric field in its interior.
(D) The electric current flows in a direction opposite to the motion of the electrons.
The given figure shows a pole fixed in the centre of a garden. Four students observed the shadow formed by the pole for different time intervals and then plotted the graph of height of shadow (in cm) vs their observation time, as shown here.
Which of the following graphs show(s) correct observations?
CII and IV only
DI, II and III only
The tail of a the comet points away from the sun due to
(A) Centrifugal force
(B) Electrical repulsion
(C) Attraction of comet due to other planets
(D) Radiation pressure.
The microorganism in the given figure is
(A) Phase in the life cycle of bacteria
(B) Bacteria that eats other bacteria
(C) Virus that uses bacteria as a host
(D) None of the above.