List of practice Questions

A black body has maximum wavelength 1 m at 2000 K. Its corresponding wavelength at 3000 K will be
250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be : -
A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of $12 ms^{-1}$. If the mass of the ball is 0.15 kg, the imparted to the ball is
A bullet of mass 10 g leaves a rifle at an initial velocity of 1000 m/s and strikes the earth at the same level with a velocity of 500 m/s. The work done in joule overcoming the resistance of air will be
For a satellite escape velocity is 11 km/s. If the satellite is launched at an angle of 60$^{\circ}$ with the vertical, then escape velocity will be
A $5.5$ metre length of string has a mass of $0.035 \,kg$. If the tension in the string in $77\, N$, the speed of a wave on the string is
If the amplitude of sound is doubled and the frequency reduced to one fourth, the intensity of sound at the same point will be
A current of 2 A, passing through a conductor produces 80 J of heat in 10 seconds. The resistance of the conductor in ohm is
A chordate character is
Transfer of Taenia to secondary host occurs as
Jelly fish belongs to class
Fish which can be used in biological control of mosquitoes/Larvicidal fish is
Mango juice is obtained from
A bus is moving on a straight road towards north with a uniform speed of 50 km/hour then it turns left through 90$^{\circ}$. If the speed remains unchanged after turning, the increase in the velocity of bus in the turning process is
A metal oxide has the formula $M_2O_3$. It can be reduced by $H_2$ to give free metal and water. $0.1596\, g$ of $M_2O_3$ required 6 mg of $H_2$ for complete reduction. The atomic mass of the metal is
'Continuity of germplasm' theory was given by
Curie is a unit of
It is possible to obtain oxygen from air by fractional distillation because
\(K_1\) and \(K_2\) are equilibrium constant for reactions (i) and (ii) 
(i) \(N_2 ( g ) + O_2 ( g ) \leftrightharpoons 2 NO ( g)\)
(ii) \(NO ( g ) \leftrightharpoons \frac{1}{2} N_2 ( g ) + \frac{ 1}{ 2} O_2 ( g )\).Then,
Bleaching powder reacts with a few drops of conc. HCI to give
The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are
Oxygen will directly react with each of the following elements except?
Which one has the lowest boiling point?
When orthophosphoric acid is heated to 600$^{\circ}$C, the product formed is
Each of the following is true for white and red phosphorus except that they