The meaning of education through excursion is

• education outside school premises

• recreation outside school premises

• practical personal experience

• learning in difficult situation

Which of the following teaching method was invented by Kilpatrick?

• Problem solving method

• Project method

• Heuristic method

• Demonstration method

Bronze is an alloy of

• copper and zinc

• copper and tin

• copper and iron

• copper and aluminium

Which of the following is not objective of a science laboratory?

• To arouse interest towards science amongst the students

• To prove scientific principles

• To use the spare time of students

• To develop the measuring skills

Following is not a property of radiation

• It travels with velocity of light

• Medium is necessary for propagation

• Its nature is electromagnetic

• It has quantum nature

Which of the following characteristics of sound depend on the amplitude of vibrations?

• Speed

• Pitch

• Loudness

• Quality

Match List I with List II and choose the correct answer from the codes given below the lists

• A B C D$\to$(iv) (iii) (ii) (i)

• A B C D$\to$(i) (ii) (iii) (iv)

• A  B C  D$\to$(iii) (iv) (i) (ii)

• A B C D$\to$(ii) (i) (iii) (iv) .

In the reaction

2H₂O $\stackrel{}{\rightleftharpoons }$ H₃O⁺ + OH^- , water is 

• a weak base

• a weak acid

• Both a weak acid and a weak base

• Neither an acid nor a base

Silicious cell-wall is present in

• blue-green algae

• diatoms

• fungi

• bacteria

20.

Which of the following is/are used as bleaching agent?

• SO₂

• H₂S

• C_l2

• All of these