class 9 mcq science
26 ' Supersonics ' are
1. instruments
2. jet planes
3. missiles
4. none
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25 The following one is used to measure time in the laboratory
1. wall clock
2. time clock
3. wrist clock
4. stop clock
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24 Thermometer is used to measure
1. mass
2. temperature
3. pressure
4. gravitation
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23 The following one is considered as safety, rule in laboratory
1. never eat or drink anything in the science lab
2. always clean up when you have finished the experiment
3. wear safety goggles while doing experiments
4. all of the above
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