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HSSC Senior Scientific Assistant/Dt.-31-12-2022 Morning Shift (Cat. No.-3,4,9)
📆 December 17, 2024
Total Questions: 100
21.
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) 10
Correct Answer:
(b) 13
22.
Which of the following is a unique property of laser?
(a) Directional
(b) Speed
(c) Coherence
(d) Wavelength
Correct Answer:
(c) Coherence
23.
Which of the following is not a characteristic of laser?
(a) Monochromatic
(b) Coherent
(c) Divergent
(d) Intense
Correct Answer:
(c) Divergent
24.
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 above
Correct Answer:
(b) Infrared absorption spectroscopy
25.
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) mu
Correct Answer:
(b) mu sinθ
26.
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 N
Correct Answer:
(b) 1 N
27.
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 tube
Correct Answer:
(b) Water will stay at a height of 12 cm in the capillary tube
28.
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 above
Correct Answer:
(a) The flow is steady, non-viscous, incompressible and irrotational
29.
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 potential
Correct Answer:
(a) Absorption and emission of radiation
30.
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 molecule
Correct Answer:
(c) Presence of unpaired electron in a molecule
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