WBCS Preliminary
WBCS Preliminary General Science previous-year questions
593 questions with answers, examination years and a direct link to the online practice interface.
191 PYQs
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For a floating body to be in stable equilibrium, where should its centre of buoyancy be located?
- At the centre of gravity
- Above the centre of gravity
- Below the centre of gravity
- It may anywhere
Answer: BAbove the centre of gravity
An iron ball is heated. The percentage increase will be largest in
- density
- surface area
- diameter
- volume
Answer: Dvolume
A drop of water is broken into two drops. The sum of which property of the drops is equal to that of the single one?
- Radius
- Surface area
- Surface energy
- Volume
Answer: DVolume
A metallic ball has a spherical cavity at its centre. If the ball is heated what happens to the cavity?
- Its volume decreases.
- Its volume increases.
- Its volume remains unchanged.
- Its volume may increase or decrease depending upon the nature of the metal.
Answer: BIts volume increases.
Combine three resistors 5Ω, 4.5Ω and 3Ω in such a way that the total resistance of this combination is maximum with value
- 12.5 Ω
- 13.5 Ω
- 14.5 Ω
- 16.5 Ω
Answer: A12.5 Ω
A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be W1. If the bird flies about inside the cage, the reading of the spring balance becomes W2. Which of the following is true?
- W1 > W2
- W1 < W2
- W1 = W2
- W1 = 1/W2
Answer: AW1 > W2
The density of water at 20°C is 998 kgm⁻³ and that at 40°C is 992 kgm⁻³ . The coefficient of the cubical expansion of water is
- 2 × 10-4 °C-1
- 6 × 10-4 °C-1
- 3 × 10-4 °C-1
- 4 × 10-4 °C-1
Answer: C3 × 10-4 °C-1
The efficiency of a Carnot engine working between 227°C and 27°C is
- 100%
- 50%
- 40%
- 20%
Answer: C40%
The radiation carrying maximum energy - W W P WBCSP li
- UV rays
- Gamma rays
- X-rays
- IR rays
Answer: BGamma rays
Which quantity is increased in step-down transformer?
- Voltage
- Current
- Wattage
- Frequency
Answer: BCurrent
A particle is moving a uniform circular motion with constant speed V along a circle of radius r. The acceleration of the particle is
- Zero
- v/r
- v/r2
- v2/r
Answer: Dv2/r
A boat floating in a tank is carrying some passengers. If the passengers drink water from the tank, how will it affect the water level of the tank ?
- It will go down.
- It will rise.
- It will depend on the atmospheric pressure.
- It will remain same.
Answer: DIt will remain same.
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