We are able to walk on earth without slipping because of – frictional force
What are the phenomena which established the transverse nature of light – polarization
What is the name of the device used to convert alternating current into direct current – Rectifier
Stars twinkle but planets do not, twinkle because – they are nearer to the earth and hence we receive a greater amount of light and therefore minor variations in intensity are not noticeable
Atomic bomb is based on the principle of – uncontrolled nuclear fission
Bubbles of air rise up through liquids due to – viscosity and buoyancy
A fresh egg when placed in salt water will – float
Fleming left hand rule is associated with the effect of – magnetic field on current
A temperature rises in environment that disturbs life is called – thermal pollution
One horse power is equal to – 746 watts
Fission and fusion are called – nuclear reactions
A moving car possesses – mechanical energy
The Sun appears red in color during sunrise and sunset due to – the fact that all other colors scatter away except red
In the absence of the earth’s atmosphere sky would appear – Black
Which color of light deviates least through the prism – Red
The spitting of white light into its component is due to – Dispersion
Lens is made up of – Flint Glass
Ohm’s law is valid in case of – Conductor
Stars appears to move from east to west because – the earth rotates from west to east
Sound waves in air are – longitudinal
Material for rain proof coats and tents owe their water proof properties to – surface tension
The motion of a body that repeats itself after a regular interval of time is - Periodic motion
The drum of photostat machine is made of – Selenium
To an observer on the lunar surface, during daytime, the sky will appear to be – Black
On the moon, an astronaut cannot drink lemonade with the help of a straw because - there is no atmosphere on the moon
Batteries used in mobiles are - Secondary Batteries
'Knot' is used in – Speed
Outside of cooking utensils are generally left black from below because - black surface is a good absorber of heat.
Tape recorder records in the form of – Magnetic Energy
Which instrument is used to measure altitudes in aircraft's – Altimeter
What is the Virtual weight of floated object – Zero
Raman was awarded Nobel Prize for his work on - Light Scattering
Kerosene oil rises up in the wick of lantern because of - surface tension
Insects can move on the surface of water without sinking due to – surface tension of water
The working principle of a washing machine is – centrifugation
Number of basic SI units is – 7
Radian is used to measure – angle
Which instrument is used to measure sound under water – Hydrophone
Alfred Nobel invented – Dynamite
Marie and Pierre Curie invented – Radian
Recoil of a gun is an example of – conservation of linear momentum
Freely falling body is an example of – non uniform motion and uniformly accelerated motion
Which statement is true about rolling friction – it can never be zero
Which is used in designing ships and submarines – Archimedes principle
Hair of a shaving brush cling together when the brush is removed from water due to – Surface tension
In the isothermal process which remains constant – Temperature
How is the power of convex lens – positive
The maximum value of static friction is – limiting friction
What is conserved when two balls collide at same temperature – momentum
Value of refractive index after increasing the temperature – Decrease
Which phenomenon is responsible for the echo of sound wave – reflection
Retina of the eye is comparable to which of the part of a traditional – film
The filament of an electric bulb is made of – tungsten
The reason of mirage is – total internal reflection of light
A cut diamond sparkles because of its – high refractive index
Butter paper is an example of – a translucent object
The color of the star is an indication of its – temperature
Sound travels in the form of – longitudinal waves
The mirror used by a dentist to examine the teeth of patients is – concave
In three pin plugs, the longest pin should be connected by – ground terminal
Earliest thermometer was developed by - Galileo
The absolute zero is a temperature at which – molecular motion in a gas would cease
When an object is heated, the molecules of that object – began to move faster
One kilowatt-hour is equal to - 36×105?
SI unit of pressure is – Pascal
A transformer work on principal of – Mutual Induction
The path of a projectile is called its – trajectory
The lens of eye is – convex
Which color of light deviates maximum in the dispersion of white light by prism – Violet
Optical fibre works on the principal of – total internal reflection
Superconductor is the conductor whose resistance is – zero
A Photostat machine works on – electrostatic image making
Lightning is caused due to – electric discharge
The magnetic needle always points in – North-South direction
What is the source of electrical energy in an artificial satellite – solar cell
Transformer is used to - Step up or step-down AC voltage
When a body is taken from the earth to the moon – its weight decreases
Which is the best conductor of electricity – silver
