11.

Which of the following effect is not found in sound waves?

• Polarisation

• Reflection

• Interference

• Diffraction

Which is significant for a fuse wire?

• Its melting point

• Its specific resistance

• Current flowing through it

• All of the above

Electronic configuration of Cr is

• 3d⁵ 4s¹

• 3d⁶ 4s⁰

• 3d⁴ 4s²

• 3d⁵ 4s⁰

Producer gas is

• Mixture of CO and H₂

• Mixture of CO₂ and H₂

• Mixture of CO₂ and Cl₂

• Mixture of CO and N₂

Ms. Kumar, principal of a school, wants integrated approach to the teaching of Science rather teaching different subjects separately. The reason of this is

• difficulty in the adjustment of the teachers in the time-table

• difficulty of students to adjust with different teachers

• non-availability of qualified teachers in her school to teach different subjects

• all the subjects are interlinked and a teacher can draw on cross-curricular linkage

Uric acid is the excretory product of which of the following?

• Frog, Human

• Bird, Snake

• Amoeba, Starfish

• None of these

Which of the following statement is incorrect regarding the continuous and complete evaluation in the teaching of Science?

• It is constructive evaluation

• It is a cumulative evaluation

• It is carried out once in a year

• It is carried out throughout the year

Which one of the following is an example of non-embryophyta?

• Ephedra

• Pteridium

• Riccia

• Ulothrix

Match List I with List-II and select the correct answer by using the codes given below the list.

• A	B	C	D
  I	II	IV	III

• A	B	C	D
  II	I	III	IV

• A	B	C	D
  II	I	IV	III

• A	B	C	D
  I	II	III	IV

The first step of the scientific method is

• forming a hypothesis

• making an observation

• conducting an experiment

• predicting the result of experiment