Consider the following statements about some planets in the solar system : 1. Mercury has no atmosphere. 2. Venus has two moons. 3. There is no land on Jupiter. 4. Rings of Saturn are composed of lumps of ice and dust. Which of the statements given above are correct ?
- A.1 and 2 only
- B.3 and 4 only
- C.1, 2 and 3
- D.1, 3 and 4
Correct answer
Explanation
The correct answer is D, 1, 3 and 4. Mercury is small and very close to the Sun, so its weak gravity and the intense solar heat and wind have stripped away almost all gas; it has only a trace exosphere, which is why it is described as having no atmosphere. Jupiter is a gas giant made mostly of hydrogen and helium, so there is no solid surface or land to stand on, only ever denser layers of gas and liquid. Saturn's famous rings are made of countless pieces of water ice, ranging from tiny grains to boulders, mixed with rock and dust. Statement 2 is wrong because Venus has no moon at all; Mercury and Venus are the only planets without natural satellites. Option A is wrong because it accepts statement 2 and leaves out 3 and 4. Option B is wrong because it leaves out statement 1. Option C is wrong because it accepts statement 2 and leaves out statement 4. Exam tip: Mercury and Venus have no moons, Mars has two, and all four giant planets have rings.
Practice Questions
View allLoktak lake is situated in the State of
- A.Sikkim
- B.Manipur
- C.Odisha
- D.Mizoram
Show answer
Loktak Lake lies south of Imphal in Manipur and is the largest freshwater lake in North-East India. Loktak is famous for its phumdis, floating masses of soil, vegetation and decaying organic matter that drift on the water.
Read the full explanation →The formation of 'tors' on small rocky hills is associated with which among the following?
- A.Granite
- B.Limestone
- C.Alluvial
- D.Dolomite
Show answer
Tors are piles of rounded, weathered blocks standing on hilltops, and they form typically in granite. Granite cools deep underground and develops a network of joints, or cracks.
Read the full explanation →Which one of the following statements is NOT correct ?
- A.Bokaro steel plant is located in Damodar river basin
- B.Jamshedpur steel plant is located on the confluence of Damodar and Barakar
- C.Salem steel plant is located on the bank of Kaveri River
- D.Bhilai steel plant obtains water from Tandula reservoir
Show answer
Jamshedpur stands at the meeting point of the Subarnarekha and Kharkai rivers, not the Damodar and Barakar. Jamsetji Tata chose Sakchi, later named Jamshedpur, and the Tata Iron and Steel Company began production there in 1912.
Read the full explanation →Which of the following is/are warm ocean current(s) ? 1. Alaska Current 2. Agulhas Current 3. Falkland Current 4. West Australian Current Select the answer using the code given below :
- A.1 only
- B.1 and 2
- C.3 and 4
- D.4 only
Show answer
The Alaska Current and the Agulhas Current carry warm water, while the Falkland and West Australian currents are cold. A useful rule is that currents flowing from the tropics towards the poles are warm and those flowing from high latitudes towards the equator are cold.
Read the full explanation →Consider the following statements regarding the nature of rocks : I. Rocks are aggregates of one or more minerals. II. Granite is softer than soapstone. III. Gabbro is black and quartzite can be milky white. IV. Sedimentary rocks are related to foliation. Which of the statements given above are not correct ?
- A.I and II
- B.I and III
- C.II and IV
- D.II and III
Show answer
Granite is far harder than soapstone, and foliation is a feature of metamorphic rocks, not sedimentary ones, so these two statements are wrong.
Read the full explanation →