Which of the following is a percussion instrument?
bell
flute
guitar
piano
organ
Correct answer is A
No explanation has been provided for this answer.
The phenomenon of photoelectric effect is NOT used in
automatic doors
bimetallic strip thermometers
light meters in cameras
setting off burglar alarms
sound production from film tracks.
Correct answer is B
No explanation has been provided for this answer.
The silvered walls of a vacuum flask minimise loss of heat due to
conduction and convection
conduction only
convection and radiation
convection only
radiation only
Correct answer is E
No explanation has been provided for this answer.
27.8
17.8
13.6
6.4
3.6
Correct answer is C
No explanation has been provided for this answer.
2cm3
4cm3
6cm3
8cm3
12cm3
Correct answer is E
No explanation has been provided for this answer.