List of top Questions asked in KEAM- 2008

The standard deviation for the scores $1, 2, 3, 4, 5, 6$ and $7$ is $2$. Then, the standard deviation of $12, 23, 34, 45, 56, 67$ and $78$ is
The height of the dam, in a hydroelectric power station is $ 10 \,m $ . In order to generate $ 1 \,MW $ of electric power, the mass of water (in kg) that must fall per second on the blades of the turbines is
The resonance frequency of the tank circuit of an oscillator when $ L=\frac{10}{{{\pi }^{2}}}mH $ and $ C=0.04\text{ }\mu F $ are connected in parallel is
The energy released in the fission of $ 1 \,kg $ of $ _{92}{{U}^{235}} $ is (energy per fission = 200 MeV)
Two cars $ A $ and $ B $ are moving with same speed of $ 45\, km/h $ along same direction. If a third car $ C $ coming from the opposite direction with a speed of $ 36 \,km/h $ meets two cars in an interval of $ 5\, min $ , the distance of separation of two cars $ A $ and $ B $ should be (in km)
Millikan's oil-drop experiment established that
Two nuclei have their mass numbers in the ratio of $ 1:3 $ . The ratio of their nuclear densities would be
The radius of curvature of the convex face of a planoconvex lens is $ 15 \,cm $ and the refractive index of the material is $ 1.4 $ . Then the power of the lens in dioptre is
The main digestive function of enterokinase is
The wavelength of red light from $He-Ne$ laser is $ 633\, nm $ in air but $ 474 $ nm in the aqueous humor inside the eye ball. Then the speed of red light through the aqueous humor is
New systematics introduced by Sir Julian Huxley is also called
Two particles of equal charges after being accelerated through the same potential difference enter a uniform transverse magnetic field and describe circular path of radii $ {{R}_{1}} $ and $ {{R}_{2}} $ respectively. Then the ratio of their masses $ ({{M}_{1}}/{{M}_{2}}) $ is
Three charges $ {{Q}_{0}},-q $ and $ -q $ are placed at the vertices of an isosceles right angle triangle as in the figure. The net electrostatic potential energy is zero if $ {{Q}_{0}} $ is equal to
Of the isomeric hexanes, the isomers that give the minimum and maximum number of monochloro derivatives are respectively
Meselson and Stahl experiment proved