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NECO SSCE Physics 2016 past questions and answers

This 2016 NECO SSCE Physics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2016 set with instant marking.

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Sample NECO SSCE Physics 2016 questions

1. A p-n junction diode is connected to a battery. In which condition does it readily conduct a large current?
  1. When it is forward biased
  2. When it is reverse biased below breakdown
  3. When no potential difference is applied
  4. When its two terminals are shorted through an insulator

Answer: A. When it is forward biased

Forward bias lowers the potential barrier at the junction and allows charge carriers to cross it.

2. A radioactive sample contains 1,600 undecayed atoms and has a half-life of 2 days. How many undecayed atoms remain after 6 days?
  1. 800
  2. 200
  3. 100
  4. 50

Answer: B. 200

Six days is three half-lives, so the remaining number is 1,600/(2^3) = 200.

3. A photon has frequency 5.0 x 10^14 Hz. Using Planck's constant h = 6.6 x 10^-34 J s, what is its energy?
  1. 1.32 x 10^-48 J
  2. 3.3 x 10^-20 J
  3. 3.3 x 10^-19 J
  4. 1.1 x 10^-19 J

Answer: C. 3.3 x 10^-19 J

Photon energy E = hf = (6.6 x 10^-34)(5.0 x 10^14) = 3.3 x 10^-19 J.

4. Which equation correctly represents alpha decay of uranium-238, conserving both nucleon number and proton number?
  1. ^238_92U -> ^234_90Th + ^4_1H
  2. ^238_92U -> ^234_91Pa + ^4_1H
  3. ^238_92U -> ^237_92U + ^1_0n
  4. ^238_92U -> ^234_90Th + ^4_2He

Answer: D. ^238_92U -> ^234_90Th + ^4_2He

Alpha emission removes a helium-4 nucleus, leaving thorium-234, and both mass and atomic numbers balance.

5. A metal wire has a diameter of 2.5 mm. What is this diameter in metres?
  1. 2.5 x 10^-3 m
  2. 2.5 x 10^-2 m
  3. 2.5 x 10^-4 m
  4. 2.5 x 10^3 m

Answer: A. 2.5 x 10^-3 m

Since 1 mm = 10^-3 m, 2.5 mm = 2.5 x 10^-3 m.

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