Question

Q1. Three resistors of 1 Ω, 2 Ω and 3 Ω are connected in parallel. The combined resistance of the three resistors should be
(a) greater than 3 Ω (b) less than 1 Ω
(c) equal to 2 Ω (d) between 1 Ω and 3 Ω (1)

Q2.An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
(a) 440 W (b) 110 W (c) 55 W (d) 0.0023 W (1)

Q3.If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then
(a) R1 < R2 (b) R2 < R1 (c) R1 = R2 (d) R1 ≥ R2 (1)

Q4.Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
(a) current (b) voltage
(c) resistance (d) None of these (1)

Q5.A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is
(a) 2 × 103 joule (b) 2 × 105joule
(c) 2 × 104 joule (d) 2 × 102 joule (1)

Q6.What is the maximum resistance which can be made using five resistors each of 1/5 Ω?
(a) 1/5 Ω (b) 10 Ω (c) 5 Ω (d) 1 Ω (1)

Q7.A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is
(a) 2 A (b) 4 A (c) 8 A (d) 16 A (1)

Q8.Chemically, rust is
(a) ferric sulphate (b) ferric oxide
(c) hydrated ferrous oxide (d) hydrated ferric oxide (1)


Q9.When green colour ferrous sulphate crystals are heated
, its colour changes as
(a) it is decomposed to ferric oxide
(b) it loses water of crystallisation
(c) it forms SO2
(d) it forms SO3 (1)

Q10.Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which
of the following correctly represents the type of the reaction involved?
(a) Displacement reaction
(b) Decomposition reaction
(c) Combination reaction
(d) Double displacement reaction (1)


Q11. The opening and closing of the stomatal pores depend upon ;
(a) oxygen (b) water in guard cells
(c) temperature (d) concentration of CO2 in stomata (1)

Q12. In human digestive system, the enzymes pepsin and trypsin are secreted respectively by:
(a) pancreas and liver (b) stomach and salivary glands
(c) pancreas and gall bladder (d) stomach and pancreas (1)

Q13. During Respiration, the exchange of gases takes place in:
(a) bronchi (b) alveoli
(c) bronchioles (d) trachea (1)

Q14. Which vein brings clean blood from the lungs into the heart?
(a) renal vein (b) pulmonary vein
(c) vena cava ( d) hepatic vein (1)

Q15. . Which of the following has a three- chambered heart?
(a) pigeon (b) lizard
(c) fish ( d) lion (1)

Q16. . The excretory unit in the human excretory system is called:
(a) nephron (b) neuron
(c) nephridia ( d) trachea
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Answer 1

Answer:

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Answer 2

Explanation:

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