If the pressure over a liquid increases, its boiling point
increases
does not change
first decreases and then increase
decreases
A.
increases
As the pressure applied to liquid increased, the energy needed for the liquid molecules to expand to gas phase also increases. Hence higher temperature is required to change liquid to the gas phase. So, the boiling point of liquid increases on increasing pressure
Non-metallic oxides
are basic in nature
are amphoteric in nature
turn red litmus paper blue
are acidic in nature
LED and CFL are very commonly used as sources of light in homes. Which of the following statements is true?
LED is better because CFL contains toxic materials
Both are equally good
Neither of them is good because both contain toxic materials
CFL is better because LED contains toxic materials
The thumb of humans moves more freely than other fingers due to the presence of
gliding joint
hinge joint
saddle joint
pivotal joint
The main aim of conducting Mathematics and Science Olympiads is to
grade students according to their capabilities
help students score high marks in professional examinations
grade schools based on the performance of their students
promote excellence in the subject by nurturing creativity and experimentation
Four applicants for a post of TGT (Science) were asked to plan a lesson on 'Consequences of Deforestation'. Which one of the following lesson plans reflects the scientific approach?
Provides a variety of examples to explain the concept
Includes activities that children can perform in groups and draw conclusions through a PowerPoint presentation
Mentions about the use of ICT to help students understand the concept
Explains in detail the consequences of deforestation
Hormone Adrenaline
helps the body to adjust stress level when one is very angry or worried
helps control height
helps control balance of electrolytes in the body
helps control level of sugar in the blood
Bakelite is used in making electrical appliances because it is a
good conductor of heat
good conductor of electricity
good insulator of electricity
thermoplastic
The greenhouse effect which is causing an increase in the atmospheric temperature is mainly due to
nitrogen
sulphur
carbon dioxide
oxygen
While investigating 'how water affects the germination of seeds', a teacher asked the students to soak bean seeds on a bed of cotton wool for a few days and observe the changes. What is the guideline that she forgot to mention? To place
a few seeds on wet cotton
many seeds on dry cotton
a few seeds on dry cotton
many seeds on wet cotton
