Q1. Which gas is commonly used in anesthesia?
(b) nitrous oxide
(d) hydrogen peroxide
Q2. Ultrasonics are sound waves of frequency—
(a) greater than 20,000 Hz
(b) less than 10,000 Hz
(c) equal to 1000 Hz
(d) None of these
Q3. An iron ball weighing 10 kg on the earth will weigh in space—
(a) less than 10 kg
(b) more than 10 kg
(c) exactly 10 kg
Q4. Which mirror used by a dentist to examine the teeth of patients?
Q5. Which one of the following liquids is very good conductor of heat?
Q6. Sound above what level (in decibel) is considered hazardous noise pollution ?
(a) 30 dB
(b) 40 dB
(c) 60 dB
(d) 80 dB
Q7. Tube light is filled with—
(a) sodium vapour
(b) argon gas at low pressure
(c) mercury vapour at low pressure
(d) mercuric oxide and argon gas
Q8. In which of the following chlorophyll does not exist?
Q9. Which one of the following elements is a metalloid?
(d) Both (a) & (b)
Q10. In which type of coal percentage of carbon is the highest?
Q11. Which one of the following metals occurs in nature in free state?
Q12. Stainless steel contains
(a) Fe + Cr + Ni
(b) Fe + Ni + Cu
(c) Fe + Cr + Cu
(d) Fe + C + Ni
Q13. Which one among the following is not a mixture?
Q14. The biofertilizer used for the paddy crops is
(a) Blue-green algae
(b) Rhizobium species
(c) Fungal root fungal
(d) Azetobactor species
Q15. Butter paper is an example of …………. object.
(a) a transparent
(b) a translucent
(c) an opaque
(d) a luminous