One nanometer is equal to
An aeroplane is flying horizontally with a velocity ofkm/h and at a height ofm. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
Radio telescopes are better than optical telescopes because
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
Isotopes of an element contain
One thousand microns is equal to
Large astronomical telescopes always use as objective
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
Sound waves in air are
Mirage is due to
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound ism/s, what could be the maximum and minimum distances between the two persons?
Mica is used in electrical appliances such as electric iron because mica is
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Materials for rain-proof coats and tents owe their water-proof properties to
Rainbow is due to
One watt-hour is equivalent to
Sound travels at the fastest speed in
One should not connect a number of electrical appliances to the same power socket because
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Magnetism at the centre of a bar magnet is
Light from the Sun reaches us in nearly
Intensity of sound at a point is ____ its distance from the source.
It is easier to roll a barrel full of coal tar than to pull it because
Out of the following pairs, which one does not have identical dimension?
RADAR is used for
Stars which appear single to the naked eye but are double when seen through a telescope are
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
oil raise up the wick in a lamp. The principle involves
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
Stars twinkle because
It is more difficult to walk on a sandy road than on a concrete road because
Stars appears to move from east to west because
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Minimum number of unequal vectors which can give zero resultant are
Mercury is commonly used as a thermometric fluid rather than water because
Sound of frequency belowHz is called
ML2T-2 is the dimensional formula for
In which of the following industries is mica as a raw material?
Superconductors are substances which
Natural radioactivity was discovered by
Pick out the scalar quantity
It takes much longer to cook food in the hills than in the plains, because
Find the maximum velocity for the overturn of a car moving on a circular track of radiusm. The co-efficient of friction between the road and tyre is 0.2
Pa(Pascal) is the unit for
Intensity of sound has
Optical fibre works on the