I will help to answer and explain the questions from 9 t 10th grade science

I got 94% in 10th boards 

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Grade 9 Science:

1. “The temperature outside is 4 degree Celsius”. This is an example of a(n)…

a. Observation b. Inference

2. Mr. Zajac is drinking coffee in the morning. “He must be tired.” The underlined statement is an example of a(n)…

A. Observation b. Inference

Grade 9 science electricity

1. If a light bulb uses 50 J of electrical energy and produces 10 J of light energy, what is the percent efficiency of the light bulb? Show your work! (2 marks = 1 mark for correct formula; 1 mark for answer)

2. Mr. Zajac’s T.V. has a power rating of 200 Watts. During the month of May (31 days), Mr. Zajac watched T.V. for 2 hours per day. The power-supply company charges 8 ¢/kW•h. How much money does Mr. Zajac have to pay the electrical company for his T.V. related energy consumption? Please show your answer in dollars. Show your work! (4 marks)

Forensic science question

You have created an STR profile for a wildlife poaching case using 5 locl and have calculated the rancom market probability is only 1 in 10,000. Very briefly, what would you do to lower (improve your random match probability in this instance?