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Post Utme Physics Past QuestionsQuestion 881:An object placed 10cm from a concave mirror of focal length Scm would have its image ____________ A. At infinity B. 10cm from the focus C. At the radius of curvature D. At the centre of curvature Question 882:Which of the following radiation has the highest frequency? A. Infra-red rays B. Radio waves C. Light waves D. X-rays Question 883:When a ray of light is incident normally on an air-glass interface, its angle of refraction is ____________ A. 60° B. 30° C. 150° D. 0° Question 884:Which gas is filled in refrigeration? A. Acetylene B. Chlorofluorocarbon C. Methane D. Carbon monoxide Question 885:The efficiency of air-conditioning machine is measured in ____________ A. Tonnes B. Pe. cro C. Percentage D. Temperature |
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