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
A.
3d5 4s1
Electronic configuration of Cr(z = 24) = (Ar)183d44s2
Due to extra stability of half -filled subshell electron jumps from 4s-subshell to 3d-subshell.Therefore, electronic configuration of Cr=[Ar]18 3d54s1 .
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
Match List I with List-II and select the correct answer by using the codes given below the list.
List I (Petroleum fraction ) | List II ( Composition ) |
A. Gasoline | I. C8 to C16 |
B. Kerosene | II. C4 to C9 |
C. Heavy oil | III. C10 to C18 |
D. Diesel | IV. C16 to C30 |
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