10th
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- e. 11Na,15P,17Cl, 14Si, 12Mg Which of these has largest atoms? ₁₁Na,₁₅P,₁₇Cl, ₁₄Si, ₁₂Mg element an thier electronic configurations: ₁₁Na=2,8,1 ₁₅P=2,8,5 ₁₇Cl=2,8,7 ₁₄Si=2,8,4 ₁₂Mg=2,8,2 The element whic... 1
- 4 Be, 6 C, 8 O, 5 B, 13A1 Which is the most electropositive element among these? ₄Be, ₆C, ₈O, ₅B, ₁₃Al elements and thier electronic configuration : ₄Be=2,2 ₆C=2,4 ₈O=2,6 ₅B=2,5 ₁₃Al=2,8,3 The most electropositive element... 2
- 7N, 6C, 8O, 5B, 13Al Which is the most electronegative element among these? ₇N, ₆C, ₈O, ₅B, ₁₃Al Elements and thier electronic configuration ₇N=2,5 ₆C=2,4 ₈O=2,6 ₅B=2,3 ₁₃Al =2,8,3 The most electronegative element is... 1
- b. 1 H, 7 N, 20Ca, 16S, 4 Be, 18Ar Which of these elements belong to the second group? ₁H, ₇N, ₂₀Ca,_( 16)S,_( 4 )Be, ₁₈Ar Electronic configuration of atoms :: ₁H=1 ₇N=2,5 ₂₀Ca=2,8,8,2 _( 16)S=2,8,6 _( 4 )Be=2,2 ₁₈Ar=2,8,8 Amon... 1
- a. 3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to be period 3? Electronic configuration of the following elements is: ₃Li = 2,1 ₁₄Si =2,8,4 ₂He= 2 ₁₁Na = 2,8,1 ₁₅P = 2,8,5 According to electronic configu... 1
- 3. An element has its electron configuration as 2,8,2. Now answer the following questions. a. What is the atomic number of this element? 1) The atomic number of this element is 12 b. What is the group of this element? 2) This eleme... 1
- d. In which block of the modern periodic table are the nonmetals found? In P-Block block of the modern periodic table are the nonmetals found . Correct answer is option 2) P-block 1
- c. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Which of the following element... 1
- b. Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in .... Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in Group 2 1
- a. The number of electrons in the outermost shell of alkali metals is...... (i) 1 (ii) 2 (iii) 3 (iv) 7 The number of electrons in the outermost shell of alkali metals is 1 1
- 1. Rearrange the columns 2 and 3 so as to match with the column 1. Ans. (i – c – 5 ) , (ii – d – 3) , (iii – e – 6 ) , (iv – f – 1) , (v – b – 4), (vi - a – 2). Column 1 Column 2 Column 3 i. Triad c. Average... 1
- Take weights of five of your friends. Find out what their weights will be on the moon and the Mars. Take weights of five of your friend find out what their weights will be on the moon and the mars Let the weights of my friends a,b,c,d,e be... 3
- std 10th maharashtra board science part 1 gravitation notes Download pdf for offline study 1. study the entries in the following table and rewrite them putting the corrected items in a single row :gra... 2
- g. The mass of the earth is 6 x 1024 kg. The distance between the earth and the Sun is 1.5x 1011 m. the mass of the earth, m = 6 × 10²⁴ kg Assume the mass of the sun is M distance between earth and sun , r = 1.5 × 10¹¹ m force between sun a... 1
- f. The masses of the earth and moon are 6 x 1024 kg and 7.4x1022kg, respectively. The distance between them is 3.84 x 105 km. Given : Mass of the Earth(m₁) = 6 × 10²⁴ kg. Mass of the Moon(m₂) = 7.4 × 10²² kg. Distance between the Earth and the Moon(d) = 3.84 × 10⁵ k... 1
- e. A ball falls off a table and reaches the ground in 1 s. Assuming g = 10 m/s2 , calculate its speed Given: t=2s , g=10 m/s² , u=0 , a=g , s=? , v=? Solution : s=ut+1/2 gt² = 0× 1+ 1/2 (10)(1)² = 1/2 (10) s= 5m v=u+gt =0+10*1 v=10 m/s The an... 1
- d. An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? the final velocity is zero. We know the position is 500 and acceleration is 10 Let the initial velocity = u final velocity = v v= 0 m/s s =... 1
- c. The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Mass of the substance remains constant. It is the multiplication of density and volume that will remain unchanged in the whole universe. So... 2
- b. The radius of planet A is half the radius of planet B. If the mass of A is MA, what must be g= GMover R² ⇒ M=gR²/G Acording to the given data , gB/gA=1/2 and tfracR_BR_A=2 ⇒ M_B/M_A=g_B/g_A( R_B/R_A)² ⇒ M_B/M_A=1/22² ⇒ M_B=2M_A Vide... 1
- a. An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet? Given : Time= 5s , Height=5m To find : Gravitational acceleration Formula: S=ut+1/2gt² steps: by formula 5=0× t+1/2g(5)² 5=1/2g×25 therefore... 1
- 4. Let the period of revolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star, Thus, when the period of revolution of the planet at a distance R from a star is T, then from kepler's third law of planetry motion, we have... 1
- 3. Explain why the value of g is zero at the centre of the earth. Acceleration due to the earth's gravity is zero at the centre of the Earth because at that point the mass of the earth is equally distribute... 1
- e. If the value of g suddenly becomes twice its value, it will become two times more difficult to pull a heavy object along the floor. Why? Let the mass of the heavy object be m. Thus, the weight of the object or the pull of the floor on the object is W=mg Now, if g becomes twice... 2
- d. A stone thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Let us consider an object which is projected vertically upwards with initial velocity u which reaches a maximum height h. Acceleration due t... 1