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 Q. Among the following, total number of meta directing functional groups is (Integer based) — OCH3,– NO2, -CN, –CH3, -NHCOCH3, - COR, -OH, - COOH, -CI                                                         (JEE mains 2024) 1. 3 2. 5 3. 4 4. 0 Show Answer (4) (-NO2, CN, -COR, -COOH ) are meta directing.

 Q. A convex lens of focal length 40 cm forms an image of an extended source of light on a photo- electric cell. A current 1 is produced. The lens is replaced by another convex lens having the same diameter but focal length 20 cm. The photoelectric current now is:                                                         (JEE mains 2024) 1. I /2 2. 4I 3. 2I 4. I Show Answer And: I As amount of energy incident on cell is same so current will remain same. More Questions

 Q. A body of mass 1000 kg is moving horizontally with a velocity 6 m/s. If 200 kg extra mass is added, the final velocity (in m/s) is:                                                                     (JEE 2024) 1. 6 2. 2 3. 3 4. 5 Show Answer Momentum will remain conserve  1000×6=1200 x v  v = 5 m/s   More Questions

 Q. A train is moving with a speed of 12 m/s on rails which are 1.5 m apart. To negotiate a curve radius 400 m, the height by which the outer rail should be raised with respect to the inner rail is (Given, g 10 m/s²):                                                                        (JEE mains 2024) 1. 6.0 cm 2. 5.4 cm 3. 4.8 cm 4. 4.2 cm Show Answer Ans. (2)  Soln.   

 Q.  The acceleration due to gravity on the surface of earth is g. If the diameter of earth reduces to half of its original value and mass remains constant, then acceleration due to gravity on the surface of earth would be :

 Q. Two nucleotides are joined together by a linkage known as:                                                                                (jee mains 2024) 1.  Phospodiester linkage  2. Glycosidic linkage  3. Disulphide linkage  4. Peptide linkage  Show Answer 1. Phospodiester linkage 

 Q. Position of an ant (S in metres) moving in Y-Z plane is given by S=2t²j+5k (where t is in second). The magnitude and direction of velocity of the ant at t = 1 s will be :                                                         (Jee mains- 2024) 1. 16 m/s in y-direction  2. 4 m/s in x- direction  3. 9 m/s in z- direction  4. 4 m/s in y-direction  Show Answer 4 m/s in y-direction. v=ds/dt=4t ĵ At t = 1 sec v = 4ĵ More Questions kinametics PYQ

 Q. Unit of Resistance is_______.                                                         (NEET-20017) 1. Volt 2. Ohm  3. Tesla 4.None of these  Show Answer 2.Ohm ←                →