1. CRISPR technology has revolutionized genetic engineering. Which of the following applications of this technology has the highest probable to be ethically controversial?
A. Altering the cells of a human embryo to change hereditary traitsB. Correcting genetic defects in cells to treat cystic fibrosisC. Modifying the genome of crops to increase yield and drought resistanceD. Studying gene functions in model organisms like mice
2. In the figure, what does the slope of the graph OA between stress and strain indicate?
A. Yield pointB. Young's modulusC. Mass pointD. Permanent strain
3. An artificial satellite is revolving the Earth at a height of 700 km from the Earth surface. How many is the horizontal velocity of the satellite? [Radius of Earth = 6400 km and on Earth surface, ms−1 g = 9.8 ms−1]
A. 4500B. 4715C. 5675D. 7519 V = √ gR2 R+h = √ 9.8×(6400000)2 (6400+700)×103 ms−1 = 7519.06497 ms−1
4. If the horizontal range of a projectile is 4 times of its maximum height, then what is the horizontal range?
A. 4v2 gB. 2v2 gsinαC. v2 gD. v2 2gsinα tanα = 4H R = 4H 4H = 1; sin2α = 2tanα 1+tan2 α = 1 ⇒ R = v2sin2α g = v2 g
5. Plasmid of which bacteria ‘sulfur containing amino acid’ producing gene of sunflower has been transferred to clover grass by DNA?
A. E. coliB. B. thuringiensisC. A. tumefaciensD. V. cholerae
6. ; For what value of p, will not exist? M =⎡ ⎣ p 2 3 4 5 6 7 8 9 ⎤ ⎦ M −1
A. 0B. −1C. 2D. 1 M −1 |M| = 0 |M| = 0 p = 1