Answer: B) It is normal to make mistakes. Explanation: An infinitive is a verbal that can function as noun, adjective, or adverb. Having or involving the basic form of a verb is called Infinnitive clause. Way to know whether there is an infinitive is to see whether there is the word "to" in the sentence.   Hence, option B) It is normal to make mistakes. is an infinitive sentence.

Answer: D) Voltage Explanation: A transformer that increases voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a Step-Up Transformer. Conversely, a transformer designed to do just the opposite is called a Step-Down Transformer.

इसलिए, सही विकल्प (सी) है मैग्नीशियम रिबन हवा में जलने पर उत्पन्न करता है: 'मैग्नीशियम ऑक्साइड, गर्मी और प्रकाश'।

Answer: A) Breathe Explanation: It is very hard to catch breathe when you run fast.