Class 9 Science
Ch. 1 Matter In Our Surroundings Ch. 10 Gravitaion Ch. 15 Improvement In Food Resources
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Chem. Ch-1 Matter In Our Surroundings
Ch.1 Matter In Our Surroundings Exercises Q1. Convert the following temperatures to the celsius scale. (a) 293 K (b) 470 K A1. (a) *(t)K = (t) ° c + 273 ⇒ 293 = (t) ° c +273 ⇒ (t) ° c = 293 - 273 ⇒ (t) ° c = 20 ° c (b) (t)K = (t) ° c + 273 ⇒ 470 = (t) ° c + 273 ⇒ (t) ° c = 470 - 273 ⇒ (t) ° c = 197 ° c *(t) refers to temperature. Q2. Covert the following temperatures to the Kelvin scale. (a) 25 ° c ...
Chapter-1 Number Systems
Ch. 1 NUMBER SYSTEMS EXERCISE 1.1 Q1. Is zero a rational number? Can you write it in the form p/q , where p and q are integers and q ≠ 0? A1. Yes 0 is a rational number. It can be written in the form p/q, where p and q are integers and q≠0. For example, 0/5 where p=0 and q=5. Q2. Find six rational numbers between 3 and 4. A2. ∙ 3= 30/10, ∙ 4= 40/10 ∴ Six rational numbers between 3 and 4 are 31/10, 32/10, 33/10, 34/10, 35/10, 36/10. Q3. Find five rational numbers between 3/5 and 4/5 . A3. ∙ 3/5 = 30/50, ∙ 4/5 = 40/50 ∴ Five rational numbers between 3/5 and 4/5 are 31/50, 32/50, 33/50, 34/50, 35/50. Q4. State whether the following statements are true or false. Give reasons for your answers. (i) Every natural number is a whole number. (ii) ...