Question
The average cost of 3 chairs is Rs. 8000. The average
cost decrease by 20% when one more chair is included. What is the cost price of the 4th chair?Solution
Total cost of 3 chairs = 8000 × 3 = Rs. 24000 Average cost of all the 4 chairs = 8000 × (80/100) = Rs. 6400 Total cost of all the 4 chairs = 6400 × 4 = Rs. 25600 Cost of the 4th chair = 25600 - 24000 = Rs. 1600
Which property of a wave is related to its frequency? Â
Rain drops acquire spherical shape due to -
A device used for converting A.C. into D.C. is called –
A metallic conductor of circular cross-section has radius R. If current density varies as J = Jₒ(1−r/R), the total current through the conductor is:...
A parallel plate capacitor is half-filled with a dielectric slab (K = 4). What is its effective capacitance, assuming plate separation d?
If the specific heat at constant pressure Câ‚š is greater than Cáµ¥ , the difference Câ‚š -Cáµ¥ is equal to:
What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as?
The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?
Which device is best suited for measuring the temperature inside metallurgical furnaces?
When do spring tides occur?
Relevant for Exams:
