Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Which of the following country/countries successfully inserted a spacecraft into Mars' orbit by maiden attempt?
USA
USA and Russia
India
China
The radius of the Moon is about one-fourth that of the Earth and acceleration due to gravity on the Moon is about one-sixth that on the Earth. From this, we can conclude that the ratio of the mass of Earth to the mass of the Moon is about –
10
100
1,000
10,000
Perspiration cools the body because:
presence of water on the skin is cooling
evaporation requires latent heat
water has a high specific heat
water is a poor conductor of heat
Thermal conductivity of Aluminum, Copper and Stainless - Steel increases in the order:
Copper < Aluminum < Stainless Steel
Stainless Steel < Aluminum < Copper
Aluminum < Copper < Stainless Steel
Copper < Stainless Steel < Aluminum
The Sun is observed to be reddish when it is near the horizon, i.e., in the morning and the evening. This is because
red light is least scattered by atmosphere
red light is most scattered by atmosphere
it is the color of the Sun in the morning and evening
Earth's atmosphere emits red light
