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Why two astronauts cannot talk to each other in space?

ASound cannot be heard due to Moon's gravitational force.
BSound reflects back.
CSound travels only in straight line.
DSound cannot travel through vacuum.

Refer to given set-up and answer the following questions.
X : What will be the shape of the shadow obtained?
Y : How can we get a triangular shadow?


A
B
C
DNone of these

Length of a cotton thread is measured between two points on a ruler. When the length of cotton thread is wound closely around a pencil, it goes round six times. What is the length of the cotton thread needed to once round the pencil?


A1.45 cm
B1.75 cm
C2.17 cm
D2.03 cm

Read the given paragraph. Our food consists of carbohydrates, proteins, fats, vitamins and P. Carbohydrates contain carbon, hydrogen and Q. Proteins if deficient in diet can lead to R in children below 1 year of age. Deficiency of vitamin A can lead to S. Select the incorrect statement regarding P, Q, R and S.

AP can either be minerals or roughage.
BQ is oxygen.
CS can be nightblindness.
DR is pellagra.

Select the incorrect match.


A(i) and (ii) only
B(ii) and (iii) only
C(iii) only
D(i), (ii) and (iii)

The given graph shows the distance between the particles in three samples (P, Q and R) having water in different states of matter.
Which of the following will NOT have
X- Fixed shape only
Y- Fixed shape and volume?


AX- R; Y- Q
BX- R; Y- P
CX- P; Y- Q
DX- P; Y- R

Select the odd one out.

ABDGK
BJLOS
CNPSW
DMORU

Match column I with column II and select the correct option from the codes given below.

Which of the following statements is correct?

A The soft substance present inside the bones is called bone marrow.
B Pivot joint allows the maximum movement in all planes whereas hinge joint allows the least movement in one plane only.
C The only movable bone in skull is the upper jaw bone.
D Snakes have hollow bones and birds have flexible backbones.