The direction of heat flow between two objects depends on
their heat contents
their masses
their temperatures
whether they are in solid, liquid or gaseous state
Correct Answer :
C. their temperatures
Related Questions
Less dew is formed on cloudy nights because
there is no moisture in the atmosphere
clouds absorb the falling dew
objects emit radiant energy very fast on such nights
objects lose less radiant energy
When ice just melts
there is no change in volume
there is no change in temperature
heat is given out
there is no change of state
In a hydraulic pressure
force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston
the distance the small piston moves is equal to the distance the large piston moves
applied pressure is equally transmitted throughout the liquid in all directions
force acting on small piston is equal to the force acting on large piston
Air pressure is usually highest when the air is
warm and moist
cool and dry
warm and dry
cool and moist
The earth's nearest neighbour in space is
the Sun
the Moon
the Venus
the Mars
A small bubble of air deep down in a lake rises up to the top of the lake. The volume of the bubble on coming up will
increase
decrease
will not change
first increase and then decrease
The coil of an electric heater is made of
Platinum
Tungsten
Nichrome
Copper
Heat is transmitted from one end of a metal rod to its other end by the method of
conduction
convection
radiation
sublimation
When ice melts, Its volume
decreases
increases
remains the same until all the ice has melted and then increases
remains the same
A radio set that uses valves does not start operating immediately when it is switched on whereas a set containing only tranaistors operates immediately. The reason for this is that
the valve filaments have low resistance
valve-radio sets work at a higher voltage
transistor set has a low resistance
filaments of the valves cake time to beat up and function
Which of the following sets of elementary particles have nearly equal masses?
Neutron and Proton
Electron and Proton
Neutron and Electron
Proton, Neutron and Electron
The colour of the light which travels through glass with minimum speed is
red
violet
green
yellow
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212°
32°
-40°
0°
In hot climatic conditions, the buildings are painted white because
white paint is economical
it does not fade off
it does not crack with higher temperature
white coating is a bad conductor of heat and reflects heat rays that fall on it, thus keeping the inside cool
The loudness of a sound is determined by
Frequency
Amplitude
Speed
Wavelength
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212°
32°
-40°
0°
Mercury is used in a barometer because
its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
at the ordinary temperature its vapour pressure is small
it is opaque and does not wet glass
All the above
When one enters a dark room after being in bright light one is not able to see anything clearly for a while because
the retina of the eye moves forward
the retina of the eye moves backward
c).the iris is unable to dilate the pupil immediately to be able to see things
the eye has no power of accommodation
The orbit of Venus lies between those of
Mercury and Earth
Earth and Mars
Mars and Saturn
Mars and Jupiter
The focal length or lens or the eye is under the control or the
iris
pupil
ciliary body
cornea
Lightning conductors are made of
iron
chromium
copper
steel
For detecting and, testing of small electric charges we use
an electrophorus
an electroscope
an electromagnet
an ammeter
The speed at which light travels in vacuum is
3 x 107 ms-1
5 x 108 ms-1
3 x 104 kms-1
3 x 108 ms-1
Out of the following which is an insulator?
Silver
Copper
Nichrome
Dry wood
Holography is the technique of
taking photos of various objects
recording and reproducing three dimensional images
tracing out planets and stars in the sky
transmitting light waves
The device for tracking and locating the position of a moving object in space is called
Space ship
Lunar module
Radar
Rocket
A photon is
a quantum of electromagnetic radiation
light source used in photography
a photo film
sun-light
A pair of stars that revolve round each other is
a neutron star
a binary star
a dwarf star
a polar star
If an empty cylinder Is half ruled with a liquid, Its centre of gravity is
shifted upwards
shifted downwards
shifted neither upward nor downward
shifted upward or downward depending on the density of the liquid
A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
It will go down
It will come up
It will remain at the same level
First it will go down and it will come up