रासायनिक अभिक्रियाएं एवं समीकरण - L22 | NCERT Discussion Part 2 | CLASS10 विज्ञान | 8AM Nishtha mam

Class 10 Science (Hindi) | Chapter 1 | रासायनिक अभिक्रियाएँ एवं समीकरण | Important Questions | Quick Revision

A block A of mass 2 kg is placed over another block B of mass 8 kg and supported by a ledge L fixed on block B on its smooth surface as its extended part. If a force F=100 N is applied on block B , it starts moving on rough horizontal surface. Find the force exerted by block B on is 25 N . (Take g=10m//s^(2) )

The earth’s magnetic field lines resemble that of a dipole at the centre of the earth. If the magnetic moment of this dipole is close to 8 x× 10^(22) Am^(2) , the value of earth’s magnetic field near the equator is close to (radius of the earth = 6.4 × 10^(6) m)

If a giant bar magnet of magnetic moment 8 xx 10^22 Am^2 is placed inside Earth such that Earth's field can be approximated by this magnet, estimate the intensity of magnetization of Earth. Take, radius of Earth = 6,400 km.

Paragraph for question nos. 9 to 11 Consider the conic C Q.9 16 12 Equation of circle touching Cat one extremity of latus-rectum and centre ofC is/are (A) 8x 8y2 19x passing throu 22y 0 (B) 8x 8 19x 22y 0 (C) 8x 8y2 19x 22y 0 (D) 8x2 8y2 19x -22y 0 Q.10 The equation of parabolas with same latu as conic C,isare 6x 21 0 (C) y (D) y Q.11 f a hyperbola passes through extremities minor axis of conic C and its transverse and conjugate axis coincides with the minor and major axis of conic C respectively, and the product of eccentricity of hyperbola and conic Cis 1.then (A) equation of hyperbola is A- l. (B) equation of hyperbola is *-1 (C) focus of hyperbola is (0, 2 3) (D) focus of hyperbola is (0,- 07-06-17 20202

The graph of compressibility factor (Z) vs. P for one mole of a real gas is shown in following diagram. The graph is plotted at constant temperature 273K. If the slope of graph at very high pressure ((dZ)/(dP)) is ((1)/(2.8))atm^(-1) , then calculate volume of one mole of real gas molecules (in L/mol) Given : N_(A)=6xx10^(23) and R=(22.4)/(273)L atmK^(-1)mol^(-1)

(a) A wire of resistance R, length l and area of cross-section A is cut into parts, having their lengths in the ratio 1:2. The shorter wire is now stretched till its length becomes equal to that of the longer wire. If they are now connected in parallel, find the net resistance of the combination. (b) Write the name of the materials having resistivity of the order of (i) 1.7 xx 10^(-8) Omega m and (ii) 10^(15) Omega m at 0 ""^(@)C .