Given below are some interesting combinations of words. Explain why they have been used together.
(i) ghostly dust devils
(ii) desert sky
(iii) stunning artefacts
(iv) funerary treasures
(v) scientific detachment
(vi) dark-bellied clouds
(vii) casket grey
(viii) eternal brilliance
(ix) ritual resins
HORNBILL 5 (x) virtual body

Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction - upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square. (i) The air tubes of insects (ii) Skeletal structures surrounding chest cavity (iii) Muscular floor of chest cavity (iv) Tiny pores on the surface of leaf (v) Small openings on the sides of the body of an insect (vi) The respiratory organs of human beings (vii) The openings through which we inhale (viii) An anaerobic organism (ix) An organism with tracheal system

Split each of the following into simple sentences and determine whether it is true or false. Also, deterinine whether an 'inclusive or' or 'exclusive or' is used. (i) The sum of 3 and 7 is 10 or 11. (ii) (1 + i) is a real or a complex number. (iii) Every quadratic equation has one or two real roots. (iv) You are wet when it rains or you are in a river. (v) 24 is a multiple of 5 or 8. (vi) Every integer is rational or irrational. (vii) For getting a driving licence you should have a ration card or a passport. (viii) 100 is a multiple of 6 or 8. (ix) Square of an integer is positive or negative. (x) Sun rises or Moon sets.

Study the following information carefully and answer the questions given below: A, B, C, D, E, F and G are seven persons who travel to office everyday by a particular train which stops at five stations I, II, III, IV and V respectively after it leaves base station. (i) Three among them get in the train at the base station. (ii) D gets down at the next station at which F gets down. (iii) B does not get down either with A or E. (iv) G alone gets in at station III and gets down with C after having passed one station. (v) A travels between only two stations and gets down at station V. (vi) None of them gets in at station II. (vii) C gets in with F but does not get in with either B or D. (viii) E gets in with two others and gets down alone after D. (ix) B and D work in the same office and they get down together at station III. (x) None of them gets down at station I. At which station does E get down?

Study the following information carefully and answer the questions given below: A, B, C, D, E, F and G are seven persons who travel to office everyday by a particular train which stops at five stations I, II, III, IV and V respectively after it leaves base station. (i) Three among them get in the train at the base station. (ii) D gets down at the next station at which F gets down. (iii) B does not get down either with A or E. (iv) G alone gets in at station III and gets down with C after having passed one station. (v) A travels between only two stations and gets down at station V. (vi) None of them gets in at station II. (vii) C gets in with F but does not get in with either B or D. (viii) E gets in with two others and gets down alone after D. (ix) B and D work in the same office and they get down together at station III. (x) None of them gets down at station I. At which station do C and F get in?

Study the following information carefully and answer the questions given below: A, B, C, D, E, F and G are seven persons who travel to office everyday by a particular train which stops at five stations I, II, III, IV and V respectively after it leaves base station. (i) Three among them get in the train at the base station. (ii) D gets down at the next station at which F gets down. (iii) B does not get down either with A or E. (iv) G alone gets in at station III and gets down with C after having passed one station. (v) A travels between only two stations and gets down at station V. (vi) None of them gets in at station II. (vii) C gets in with F but does not get in with either B or D. (viii) E gets in with two others and gets down alone after D. (ix) B and D work in the same office and they get down together at station III. (x) None of them gets down at station I. At which of the following stations do B and D get in ?

Study the following information carefully and answer the questions given below: A, B, C, D, E, F and G are seven persons who travel to office everyday by a particular train which stops at five stations I, II, III, IV and V respectively after it leaves base station. (i) Three among them get in the train at the base station. (ii) D gets down at the next station at which F gets down. (iii) B does not get down either with A or E. (iv) G alone gets in at station III and gets down with C after having passed one station. (v) A travels between only two stations and gets down at station V. (vi) None of them gets in at station II. (vii) C gets in with F but does not get in with either B or D. (viii) E gets in with two others and gets down alone after D. (ix) B and D work in the same office and they get down together at station III. (x) None of them gets down at station I. After how many stations does E get down?

Study the following information carefully and answer the questions given below: A, B, C, D, E, F and G are seven persons who travel to office everyday by a particular train which stops at five stations I, II, III, IV and V respectively after it leaves base station. (i) Three among them get in the train at the base station. (ii) D gets down at the next station at which F gets down. (iii) B does not get down either with A or E. (iv) G alone gets in at station III and gets down with C after having passed one station. (v) A travels between only two stations and gets down at station V. (vi) None of them gets in at station II. (vii) C gets in with F but does not get in with either B or D. (viii) E gets in with two others and gets down alone after D. (ix) B and D work in the same office and they get down together at station III. (x) None of them gets down at station I. E gets down after how many stations at which F gets down?

(i) A poor emitter has a large reflectivity . Explain why. (ii) A copper tumbler feels much colder than a wooden block on a cold day. Explain why. (iii) The earth would become so cold that life is not possible on it in the absence of the atmosphere. Explain why? (iv) Why clear nights are cooler than cloudy nights? Why does a piece of red glass when heated and taken out glow with green light? (vi) Why does the earth not become as hot as the sun although it has been receiving heat from the sun for ages? (vii) Animals curl into a ball when they are very cool. Why? (viii) Heat is generated continuously in an electric heater but its temperature becomes constant after some time. Explain why? (ix) A piece of paper wrapped tightly on a wooden rod is observed to get charred quickly when held over a flame as compared to a similar piece of paper when wrapped on a brass rod. Explain why? (x) Liquid in a metallic pot boils quickly whose base is made black and rough than in a pot whose base is highly polished . Why?