Related Questions

The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
A 32%
B 40%
C 48%
D 60%
The green light only ever goes on when tank A is full and tank C isn't empty. The red light is always on unless either tank A isn't Full or tank B is empty. Given that the green light is on, we can conclude all of the following EXCEPT---
A Tank A cannot be empty
B The red light must be on
C Tank C cannot be empty
D we don't have enough information to determine whether tank B is empty or not
Water flows into an empty 64-gallon drum through pipe A and flows out through pipe B. If the rate of flow through A is 2 gallons/hour, how many gallons per hour must flow out through pipe B so that the drum is full in exactly 96 hours?
A 3/8
B 1/2
C 2/3
D 4/3
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
A High neutron absorption cross-section
B Low moderating efficiency
C High neutron scatter cross-section
D Low neutron absorption cross-section
শূন্য মাধ্যমে আলোর বেগ C পানি ও হীরকের প্রতিসরাঙ্ক যথাক্রমে 1.33 ও 2.66 হলে পানিতে আলোর (Velocity of light in free space is c. Refractive indices of water and diamond 1.33 and 2.66 respectively. The velocity of light in water is)
A 1.33 c
B 1.33c/2.66
C c / 1.33
D c/2.66
When a strong beam of light is passed through a colloidal solution, the light will
A Be scattered
B Pass unchanged
C Be absorbed
D Be reflected
The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.
A Average
B Geometric mean
C Product
D Sum
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
Catherine was through and through a great woman. What does `through and through' mean?
A totally
B almost
C not at all
D partially
Which of the following characteristics of light remains unchanged when light travels from vaccum enters water?
A Speed
B Amplitude
C Frequency
D Wavelength

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