HSSC Senior Scientific Assistant/Dt.-31-12-2022 Morning Shift (Cat. No.-3,4,9)Total Questions: 10021. In a frequency distribution, mid-value of a class is 15 and class interval is 4. The lower limit of the class is-(a) 14(b) 13(c) 12(d) 10Correct Answer: (b) 1322. Which of the following is a unique property of laser?(a) Directional(b) Speed(c) Coherence(d) WavelengthCorrect Answer: (c) Coherence23. Which of the following is not a characteristic of laser?(a) Monochromatic(b) Coherent(c) Divergent(d) IntenseCorrect Answer: (c) Divergent24. The most powerful analytical technique(s) which offer(s) the possibility of chemical analysis is-(a) UV-vis spectroscopy(b) Infrared absorption spectroscopy(c) NMR(d) All of the aboveCorrect Answer: (b) Infrared absorption spectroscopy25. A body of mass m is projected with a speed u making an angle θ with the horizontal. The change in momentum suffered by the body along the Y-axis between the starting point and the highest point of its path will be-(a) mu cosθ(b) mu sinθ(c) 2mu sinθ(d) muCorrect Answer: (b) mu sinθ26. A bullet of mass 25 g moving with a velocity of 200 cm/s is stopped within 5 cm of the target. The average resistance offered by the target is-(a) 4 N(b) 1 N(c) 3 N(d) 2 NCorrect Answer: (b) 1 N27. Water rises to a height of 16.3 cm in a capillary tube of height 18 cm above the water level. If the tube is cut at a height of 12 cm-(a) Water will come out as a fountain from the capillary tube(b) Water will stay at a height of 12 cm in the capillary tube(c) The height of water in the capillary tube will be 10.3 cm(d) Water will flow down the sides of the capillary tubeCorrect Answer: (b) Water will stay at a height of 12 cm in the capillary tube28. Bernoulli's equation is derived making assumptions that-(a) The flow is steady, non-viscous, incompressible and irrotational(b) The flow is uniform and incompressible(c) The flow is non-viscous, uniform and steady(d) None of the aboveCorrect Answer: (a) The flow is steady, non-viscous, incompressible and irrotational29. The physical property, on which spectrophotometry is based, is-(a) Absorption and emission of radiation(b) Emission of radiations(c) Rotation of radiations(d) Electrical potentialCorrect Answer: (a) Absorption and emission of radiation30. The criterion for electronic spin resonance is-(a) Periodic change in polarizability(b) Spin quantum number of nuclei > 0(c) Presence of unpaired electron in a molecule(d) Presence of chromophore in a moleculeCorrect Answer: (c) Presence of unpaired electron in a moleculeSubmit Quiz« Previous12345678910Next »
