List of practice Questions

A body coo Is in 7 min from 60$^{\circ}$C to 40$^{\circ}$C. What time (in min) does it take to cooI from 40$^{\circ}$C to 28$^{\circ}$C, if surrounding temperature is 10$^{\circ}$C? (Assume Newton's law of cooling)
A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the $7^{th}$ second is
A body covers 26, 28, 30, 32 meters in $10^{th}$, $11^{th}$, $12^{th}$ and $13^{th}$ seconds respectively. The body starts
A body at rest explodes into two pieces of same masses which
A boat takes 2 hours to travel 8km and back in still water lake.With water velocity of 4 kmph the time taken for going upstream of 8km and coming back is.
A bob of mass $m$ is suspended by a light string of length $ L $ . It is imparted a horizontal velocity $ v_0 $ at the lowest point A such that it completes a circle in the vertical plane.
Match Column I with Column II.
A body $A$ starts from rest with an acceleration $a_1$. After $2$ seconds, another body $B$ starts from rest with an acceleration $a_2$. If they travel equal distances in the 5th second, after the start of $A$, then the ratio $a_1: a_2$ is equal to
A blue spot on white sheet is seen through red filter. What does one see ?
A block of mass 4 kg is suspended through two light spring balances A and B of spring constants $K_A$ and $K_B$ ($K_A$ > $K_b$). Then spring balances A and B will read
A block of mass 7 kg is placed on a smooth table. An unstretchable thread tied to it passes over a frictionless pulley and carries another mass of 3 kg at other end. The acceleration of the system is
A block of pure silicon at $300\, K$ has a length of $10\, cm$ and an area of $1.0\, cm^2$. A battery of emf $2\, V$ is connected across it. The mobility of electrons is $0.14 \,m^2 \,V^{-1}\, s^{-1}$ and their number density is $1.5 \times 10^{16}\, m^{-3}$. The electron current is
A block of mass $ 2 \,kg $ is dropped from a height of $ 40 \,cm $ on a spring whose force-constant is $ 1960\, N\,m^{-1} $ . The maximum distance through which the spring is compressed by
A black powder when heated with cone. $HCl$ gives a greenish yellow gas. The gas acts as an oxidising and a bleaching agent. When it is passed over slaked lime, a white powder is formed which is a ready source of gas. The black powder and white powder respectively are
A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with $NH_3$ an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from
Which is synthesised in G phase ?
At which stage of meiosis does the genetic constitution of gametes is finally decided ?
Mitosis is characterised by
Chromomeres are distinguishable during
In oocytes, diplotene chromosomes decondense and elongate to form
Meiosis results in
Tolophase I does not occur in
A bird is tossing (flying to and fro) between two cars moving towards each other on a straight road. One car has speed of $ 27 \,km\, h^{-1} $ while the other has the speed of $ 18 \,km \,h^{-1} $ . The bird starts moving from first car towards the other and is moving with the speed of $ 36\, km \,h^{-1} $ when the two cars were separated by $ 36 \,km $ . The total distance covered by the bird is
Biotrophs are
Populations connected dispersing individuals constitute
Which one accompanies shark without attaching to it