When two forces act along the same direction on an object, then the net force acting on the object is ____ of the two forces.
A) the average
B) less than the sum
C) greater than the sum
D) equal to the sum
When we rub our palms together vigorously, they become warm because muscular energy is converted into heat energy due to the friction between the palms.
All animals including human beings communicate with sounds in the range of 20 Hz and 20,000 Hz.
A student prepared a tester using a compass needle for testing the conductivity of liquid samples. He then made the following observations:
(i) The deflection of the compass needle with sample A is 5 units
(ii) The deflection of the compass needle with sample B is 3 units
(iii) The deflection of the compass needle with sample C is 8 units
(iv) The deflection of the compass needle with sample D is 10 units
The liquid sample with the highest conductivity is ____.
A) sample A
B) sample B
C) sample C
D) sample D
The weak points on the earth's crust, where the earthquakes are likely to occur, are called tectonic plates.
At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the ____ spot.
Which of the following celestial bodies appears to change its position with respect to the stars?
A) The Earth
C) The Milky way
Which was the first synthetic fibre to be made entirely of chemicals?
Special refined kerosene oil is used as a fuel in ____.
A) heavy vehicles
B) light vehicles
Study of a nucleus is known as ____.