Hi Manojraj,What I usually do is create a polygon from the map click. Ex:query.geometry = pointToPolygon(map, evt.mapPoint.x, evt.mapPoint.y, 200);
function pointToPolygon(map, pointX, pointY, tolerance){
var xmin = pointX - tolerance;
var ymin = pointY - tolerance;
var xmax = pointX + tolerance;
var ymax = pointY + tolerance;
var extent = new Extent(xmin, ymin, xmax, ymax, map.spatialReference)
var polygon = new Polygon(new SpatialReference({wkid:102100}));
polygon.addRing([[extent.xmin, extent.ymin], [extent.xmin, extent.ymax], [extent.xmax, extent.ymax], [extent.xmax, extent.ymin]]);
return polygon
}