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21. The time period of hour needle of clock is (NTSE Chhattisgarh, Stage-I, 2015-16)
1 hour
24 hour
6 hour
12 hour
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22. Two different light sources of A and B have wavelength 0.7 μm and 0.3 μm respectively. Then which of the following statement is true? (NTSE Uttar Pradesh, Stage-I, 2016-17)
A has greater energy than B
B has greater energy than A
Both has equal energy
None of these
23. If the length of a simple pendulum is increased to 4 times its value, its time period will be (NTSE Jharkhand, Stage-I, 2016-17)
Halved
Doubled
Becomes √2 times
Reduces by √2
24. One vessel with ice of 10 g at O0C and another similar vessel with water of 100 g at O0C are taken and hung in a room. After 15 min., the temperature of water is raised to 20C. The time required for the ice to be converted completely into water is (NTSE Andhra Pradesh, Stage-I, 2014-15)
1 hr
hr
2 hr
25. Calorimeters are generally made of (NTSE Uttar Pradesh, Stage-I, 2014-15)
Copper
Brass
Aluminium
Zinc
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