cameroon gce advanced level 2025 electrical engineering science 1
cameroon gce advanced level 2025 electrical engineering science 1
- Which of the following is a fundamental quantity?
A. Electric current
B. Speed
C. Momentum
D. Energy
- The dimension of pressure is
A. L−2T−2
B. ML−1T−2
C. ML−3
D. ML−1T−1
- Atoms absorb or emit radiations only when the electrons jump between allowed or stationary states. The model is by
A. John Dalton model
B. Rutherford model
C. Bohr Atomic model
D. J.J. Thomson model
- The best separation technique that could be used to separate a mixture of sand, water and salt is;
A. Filtration and then Chromatography
B. Filtration and evaporation
C. Fractional distillation
D. Decantation and filtration
- Select the best pair of nuclides which are Isobars.
A. 8Li and 11B
B. 40Ca and 40Ar
C. 17Cl and 17Cl
D. 14N and 17N
- When iron powder reacts with an aqueous solution of copper sulphate, which of these redox equations is correct?
A. Fe→Fe2++2e−
B. Fe2++Cu→Cu2++Fe
C. Cu→Cu2++2e−
D. Fe2++2e−→Fe
- The redox equation below is given for manganese (VII) oxide ion and iron (II) ion.
MnO4−+8H++5Fe2+→Mn2++4H2O+5Fe3+
The oxidizing agent is
A. Fe(aq)2+
B. Mn(aq)2+
C. $MnO_4^-_{(aq)}$
D. 5Fe(aq)3+
- The reactions of propyne with addition of water using mercury (II) sulphate (VI) as catalyst with 30% sulphuric acid produces
A. Propene
B. Propanal
C. Propanol
D. Propane
- Three organic compounds, X, Y, and Z are members of the same homologous series. Choose the correct sentence below which describes X, Y and Z, they have
A. The same functional group
B. The same number of carbon atoms in their molecules
C. The same molecular formula
D. The same physical properties
- Which fraction, from the fractional distillation of petroleum, is used as feedstock for making other chemicals?
A. Bitumen
B. Naphtha
C. Fuel oil
D. Gasoline
- The activity of a radioactive sample was 70 Bq at time, t = 5 minutes and 49 Bq at t = 10 minutes. Deduce its activity at time t = 0.
A. 112 Bq
B. 100 Bq
C. 95 Bq
D. 91 Bq
- Figure 1 shows a specimen of material that stretches and contracts as tensile force F is applied to it. The force F is first increased (0 to P) and then decreased (P to Q) as shown in the force-extension (F-e) graph. Which of the following combinations of areas X, Y and Z represents the net work done on the specimen during the stretching and contracting cycle?
A. X + Y
B. Z
C. X + Y – Z
D. X + Y + Z
