When rice is placed in water and heated , it gets cooked.It is a
Physical change
Chemical change
Mechanical change
Nuclear change
The clinical thermometer is used to check when you have
Cough
Headache
Fever
Sorethroat
Concave mirror is used in
Solar devices
Car headlights
Dentist's mirror
All of these
Which of the following is denoted by P.?
Principle focus
Pole
Principal axis
None of these
In a concave mirror, if the object is at infinity then the image formed is at
Infinity
The focus
The centre of curvature
The pole
A mirror in which the inner hollow surface is the reflecting surface is called a
Concave mirror
Convex mirror
Plane mirror
Which of the following is used as shaving mirrors?
A very narrow tube in a thermometer is called a
Capillary tube
Vascular tube
Electrical tube
A spherical mirror in which the outer surface is reflecting is called a
The shiny liquid metal in the thermometer is
Copper
Iron
Silver
Mercury