Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
Zinc is used to protect iron from corrosion because zinc is
How much CO2 is produced on heating of 1 kg of carbon?
Concave mirror is used in headlights of vehicles, because it
Water boils at a lower temperature at high altitudes, because
Which one of the following microbes causes acidification and curdling of milk?
Which of the following statements about magnetite ore of iron is/are correct?
Select the correct answer using the codes given below:
The compound C6H12O4 contains
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of
The ionization energy of hydrogen atom in the ground state is
Which one of the following waves is used for detecting forgery in currency notes?
The mirrors used as rear-view mirrors in vehicles are
How long does light take to reach the Earth from the Sun?
Electron emission from a metallic surface by application of light is known as
In a vacuum, a five-rupee coin, a feather of a sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is t1, t2 and t3 respectively. In this situation, we will observe that
The force acting on a particle of mass m moving along the x-axis is given by F(x) = Ax2 - Bx. Which one of the following is the potential energy of the particle?
An object moves in a circular path with a constant speed. Which one of the following statements is correct?
Golden rice is a genetically-modified crop plant where the incorporated gene is meant for biosynthesis of
Which one of the following is the scientific name of the causal organism of elephantiasis?
Which one of the following elements is used as a timekeeper in atomic clocks?
Which one of the following elements is involved in the control of water content of the blood?
Which one of the following gases dissolves in water to give acidic solution?
Which one of the following elements is essential for the formation of chlorophyll in green plants?
Why is argon gas used along with tungsten wire in an electric bulb?
Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (tc)?
There are five hobby clubs in a college viz., photography, yachting, chess, electronics and gardening. The gardening group meets every second day, the electronics group meets every third day, the chess group meets every fourth day, the yachting group meets every fifth day and the photography group meets every sixth day. How many times do all the five groups meet on the same day within 180 days?
Three persons start walking together and their steps measure 40 cm, 42 cm and 45 cm respectively. What is the minimum distance each should walk so that each can cover the same distance in complete steps?
In a fire range, four shooters are firing at their respective targets. The first, the second, the third and the fourth shooter hit the target once in every 5, 6, 7 and 8 seconds respectively. If all of them hit the target at 9:00 am, when will they hit their target together again.
What is the number of integral solutions of the equations HCF(a,b) = 5 and a + b = 65?
If for integer a, b and c if HCF(a,b) = 1 and HCF(a,c) = 1, then which one of the following is correct?
What is the HCF of 8(x5 - x3 + x) and 28(x6 + 1)?
The product of two numbers is 6912 and their GCD is 24. What is their LCM
The sum of two positive integers is 52 and their LCM is 168. What is the ratio between the numbers?
The HCF of two expressions p and q is 1. What is the reciprocal of their LCM?
What is the LCM of x3 + 8, x2 + 5x + 6 and x3 + 4x2 + 4x?
A student on her first 3 tests receive an average score of N points. If she exceeds her previous average score by 20 points on her fourth test, then what is the average score for the first 4 tests?
In a garrison, there was food for 1000 soldiers for one month. After 10 days, 1000 more soldiers joined the garrison. How long would the soldiers be able to carry on with the remaining food?
A contract on construction job specifies a penalty for delay in completion of the work beyond a certain date is as follows: Rs. 200 for the first day, Rs. 250 for the second day, Rs. 300 for the third day, etc. The penalty for each succeeding day being 50 more than that of the preceding day. How much penalty should the contractor pay if he delays the work by 10 days?
A sum of Rs.700 has to be used to give seven cash prizes to the students of a school for their overall academic performance. If each prize is Rs.20 less than its preceding prize, what is the least value of the prize?